AU2023309808A1

AU2023309808A1 - Baby carrier and swing mechanism

Info

Publication number: AU2023309808A1
Application number: AU2023309808A
Authority: AU
Inventors: Wenqu HU; Tao Wang
Original assignee: Wonderland Switzerland AG
Current assignee: Wonderland Switzerland AG
Priority date: 2022-07-21
Filing date: 2023-07-21
Publication date: 2025-03-06
Also published as: TW202404513A; CN221769673U; WO2024018076A2; DE112023003160T5; WO2024018076A3; TWI881398B; EP4558017A2; CN117426644A

Abstract

Disclosed are a baby carrier, a swing mechanism, and a seat connecting structure. The baby carrier includes a main frame (1), a swing bracket assembly (2), and a seat (3). The main frame (1) is configured to be supported by ground. The seat (3) is pivotally connected to the main frame (1) through the swing bracket assembly (2), so as to be able to swing backwards and forwards relative to the main frame (1).

Description

BABY CARRIER AND SWING MECHANISM

CROSS-REFERENCE OF RELATED APPLICATION

[0001] This application claims the priorities of Chinese patent application No.202210864532.4, filed on July 21, 2022 and entitled "BABY CARRIER", Chinese patent application No.202210865519.0, filed on July 21, 2022 and entitled "SEAT CONNECTING STRUCTURE AND BABY CARRIER HAVING SAME", Chinese patent application No.202211194162.4, filed on September 28, 2022 and entitled "BABY CARRIER AND SWING MECHANISM", Chinese patent application No.202211441193.5, filed on November 17, 2022 and entitled "BABY CARRIER", and Chinese patent application No.202211666803.1, filed on December 23, 2022 and entitled "BABY CARRIER", the entire contents of which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

[0002] The present disclosure relates to a baby carrier and a swing mechanism.

BACKGROUND

[0003] Baby carriers, such as a baby dining chair and a baby stroller, each include a main frame and a seat supported by the main frame.

SUMMARY

[0004] On one aspect, the present application provides a baby carrier, including a main frame, a swing bracket assembly, and a seat.

[0005] The main frame is configured to be supported by ground. The seat is pivotally connected to the main frame through the swing bracket assembly.

[0006] In some embodiments, the swing bracket assembly includes swing arms, and the swing arms each are pivotally connected with the main frame; and the baby carrier further includes swing limiting mechanisms, and the swing limiting mechanisms each are arranged between each of the swing arms and the main frame.

[0007] In some embodiments, a pivot is disposed on each swing arm, and the swing arm is pivotally connected to the main frame through the pivot. The swing limiting mechanism includes: a fixing member, fixed on the main frame and having a first limiting surface and a second limiting surface; and an abutting member, connected to the pivot and disposed between the first limiting surface and the second limiting surface, wherein the abutting member limits a swing of the swing ami by abutting against the first limiting surface and the second limiting surface.

[0008] In some embodiments, the fixing member includes a limiting groove. The first limiting surface and the second limiting surface are formed on side walls of the limiting groove, or, a limiting member is arranged inside the limiting groove and the first limiting surface and the second limiting surface are formed on the limiting member.

[0009] In some embodiments, the limiting member includes an opening allowing the pivot to pass through, and the first limiting surface and the second limiting surface are formed on a wall of the opening.

[0010] In some embodiments, a side wall of the limiting groove includes a first side wall and a second side wall parallel to each other, the first limiting surface and the second limiting surface both are formed on the first side wall and both are formed on the second side wall. The abutting member is configured to be inserted into the limiting groove, and includes a first parallel surface pair and a second parallel surface pair. Where, when swinging to abut against the first limiting surfaces, the first parallel surface pair prevents the swing arm from continuing to swing in a first direction; and when swinging to abut against the second limiting surfaces, the second parallel surface pair prevents the swing arm from continuing to swing in a second direction which is opposite to the first direction.

[0011] In some embodiments, the main frame is provided with a support pipe, and the fixing member is sleeved inside the support pipe; the limiting groove is configured to extend longitudinally along the fixing member and has a groove opening; the abutting member is inserted from the groove opening into the limiting groove. The support pipe has a first through hole; the fixing member has a second through hole; the pivot is configured to pass through the first through hole and the second through hole; and an axis of the support pipe is substantially perpendicular to an axis of the pivot.

[0012] In some embodiments, a first shaft sleeve fits over the pivot, and the first shaft sleeve is disposed on one side of the limiting groove and is installed in the second through hole; and/or, an end of the pivot includes a first flat-head portion, the abutting member includes a first flat hole for engaging with the first flat-head portion, a first limiting structure is arranged on the first flat-head portion, and the first limiting structure is configured to prevent the abutting member from being detached from the first flat-head portion.

[0013] In some embodiments, a first step is formed at a root of the first flat-head portion, and a first positioning recess is formed on the first flat-head portion; the first limiting structure includes a spring clip and a first positioning sleeve, which are located on another side of the limiting groove; the first positioning sleeve fits over the first flat-head portion and includes a radial through slot for receiving the spring clip; the spring clip is configured to be inserted into the radial through slot and engage with the first positioning recess, so that the abutting member is clamped between the first step and the first positioning sleeve.

[0014] In some embodiments, a second flat hole is formed in the first positioning sleeve, and configured to engage with the first flat-head portion; a positioning hole and a positioning column are respectively disposed on end surfaces, opposite to each other, of the abutting member and of the first positioning sleeve, and engage with each other.

[0015] In some embodiments, the pivot and the swing arm are integrally formed; and/or the first positioning sleeve is installed inside the second through hole; and/or axial guiding grooves and axial guiding ribs engage with each other, and are disposed on an outer periphery of the first shaft sleeve and on a hole wall of the second through hole, respectively.

[0016] In some embodiments, the baby carrier further includes a first swing locking mechanism for locking a swing of the seat.

[0017] In some embodiments, the first swing locking mechanism includes a first releasing member, a locking pin and a first elastic element; the first elastic element is configured to exert an elastic force on the locking pin, forcing the locking pin to stretch outwards and to be inserted into a locking hole in the seat; the first releasing member is operatively connected to the locking pin to push the locking pin to retract from the locking hole.

[0018] In some embodiments, a first annular flange is arranged on a middle part of the locking pin, and the first annular flange divides the locking pin into a first part and a second part; the first part is configured to be inserted into the locking hole, and the first elastic element fits over the second part. [0019] The first releasing member has an unlocking position and a locking position; the first releasing member includes a first elongated hole, and an obliquely-extending first stopping boss is formed on a hole wall of the first elongated hole.

[0020] The first annular flange is clamped between the first stopping boss and the first elastic element, and when the first releasing member is moving to the unlocking position, the first stopping boss pushes the first annular flange to drive the locking pin to retract.

[0021] In some embodiments, the main frame further includes a first mounting housing; the first swing locking mechanism is installed inside the first mounting housing; the first mounting housing includes a third through hole, and the locking pin is configured to stretch out from the third through hole; the first releasing member is movable relative to the first mounting housing to be switched to the unlocking position or the locking position; the first releasing member includes a first push block; and the first mounting housing includes a first opening allowing the first push block to move through. [0022] In some embodiments, the first swing locking mechanism is installed on the main frame or on the swing bracket assembly.

[0023] The first swing locking mechanism includes a first releasing member, a locking pin and a first elastic element.

[0024] A moving direction of the first releasing member is perpendicular to an extension and retraction direction of the locking pin.

[0025] In some embodiments, one of the first releasing member and the locking pin has a first connecting hole, and another of the first releasing member and the locking pin has a first cylinder; the first connecting hole has a first sloping wall, and the first cylinder is configured to be inserted into the first connecting hole.

[0026] The first releasing member has an unlocking position and a locking position; when the first releasing member is at the locking position, the locking pin is inserted into the locking hole; and when the first releasing member moves from the locking position to the unlocking position, the first sloping wall abuts against the first cylinder to drive the locking pin to retract from the locking hole.

[0027] In some embodiments, one end of the first sloping wall has a first limiting portion, and the first limiting portion is configured to engage with the first cylinder to keep the first releasing member at the unlocking position.

[0028] In some embodiments, the swing bracket assembly includes a swing housing; the first swing locking mechanism is installed on the swing housing; and the swing housing has a first sideway slidably engaging with the first releasing member, and a second sideway slidably engaging with the locking pin.

[0029] In some embodiments, the first connecting hole is formed in the first releasing member, and the first cylinder is arranged on the locking pin; an inclined guiding wall is formed on a wall of the second sideway, and the first cylinder is guided by the inclined guiding wall to enter the first connecting hole.

[0030] In some embodiments, the first swing locking mechanism further includes a mounting column, the locking pin fits over and is rotatable relative to the mounting column, and the locking pin and the mounting column are rotatable relative to each other.

[0031] One of the mounting column and the locking pin has a second connecting hole, and another of the mounting column and the locking pin has a second cylinder; the second connecting hole has a second sloping wall; the second cylinder is configured to be inserted into the second connecting hole. [0032] The first releasing member has an unlocking position and a locking position; when the first releasing member is at the locking position, the locking pin is inserted into the locking hole; when the first releasing member moves from the locking position to the unlocking position, the first releasing member drives the locking pin to rotate relative to the mounting column, and at the same time the second sloping wall abuts against the second cylinder to drive the locking pin to retract from the locking hole.

[0033] In some embodiments, one end of the second sloping wall has a second limiting portion, and the second limiting portion is configured to engage with the second cylinder to keep the first releasing member at the unlocking position.

[0034] In some embodiments, the swing bracket assembly includes a swing housing, the first swing locking mechanism is installed on the swing housing, and the first releasing member is connected to the locking pin through a crank slider mechanism.

[0035] In some embodiments, a seventh positioning mechanism is arranged between the swing housing and the first releasing member, and the seventh positioning mechanism is configured to keep the first releasing member at the unlocking position or the locking position.

[0036] In some embodiments, the opening includes a first hole portion, the first hole portion includes a first wall and a second wall, and the first limiting surface and the second limiting surface both are formed on the first wall, and both are formed on the second wall.

[0037] The abutting member is a second flat-head portion formed on the pivot; the second flat-head portion is adj cent to a first end of the pivot and includes a first plane and a second plane parallel to each other; the first plane and the second plane, during a swing of the swing arm, abut against the first limiting surface and the second limiting surface to restrict a swinging angle of the swing arm.

[0038] In some embodiments, the opening further includes a second hole portion communicating with the first hole portion.

[0039] A position of the limiting member inside the limiting groove is adjustable to allow at least part of the second flat-head portion to engage with the second hole portion to lock the swing of the swing arm.

[0040] In some embodiments, the first hole portion is formed by butting two sector-shaped subholes; two limiting portions are formed at a junction of the two sector-shaped sub-holes; and when the second flat-head portion engages with the second hole portion, the second flat-head portion has a portion clamped between the two limiting portions.

[0041] In some embodiments, the limiting groove has a groove opening and a groove bottom.

[0042] One of the second hole portion and the first hole portion is adj cent to the groove bottom of the limiting groove, and another of the second hole portion and the first hole portion is adjacent to the groove opening of the limiting groove.

[0043] A second elastic element is installed inside the limiting groove, and clamped between the groove bottom and the limiting member.

[0044] When a pressing force is applied to the limiting member, the limiting member overcomes an elastic force of the second elastic element and moves towards the groove bottom, and when the pressing force is withdrawn, the second elastic element drives the limiting member to move towards the groove opening, to enable the first hole portion and the second hole portion to selectively engage with the second flat-head portion.

[0045] In some embodiments, the main frame is provided with a support pipe, and the fixing member is sleeved inside the support pipe; the limiting groove is configured to extend along the fixing member longitudinally and has a groove opening; the limiting member is inserted from the groove opening into the limiting groove. [0046] The support pipe has a first through hole; the fixing member has a second through hole; the pivot is configured to pass through the first through hole and the second through hole; and an axis of the support pipe is substantially perpendicular to an axis of the pivot.

[0047] In some embodiments, a second shaft sleeve fits over the pivot, and the second shaft sleeve is disposed on one side of the limiting groove and is arranged to pass through the second through hole. [0048] The pivot and the swing arm are separate structures; a flat-head connecting portion is arranged on and protrudes from an end surface of a second end of the pivot; a connecting piece is arranged on the swing arm, and the connecting piece includes a third flat hole engaging with the flathead connecting portion; the pivot is provided with a second limiting structure; and the second limiting structure is configured to prevent the connecting piece, the pivot and the limiting member from being separated from each other.

[0049] In some embodiments, the pivot includes a center hole, and a second step is formed at a root of the second flat-head portion, and a third step is formed at a root of the flat-head connecting portion. [0050] The second limiting structure includes a bolt and a nut; a tail end of the bolt is inserted into the center hole from a second end of the pivot, and goes out of the center hole from a first end of the pivot to be screwed in the nut; the nut is disposed on another side of the limiting groove and located in the second through hole.

[0051] The connecting piece is clamped between the third step and a head of the bolt, and the limiting member is clamped between the second step and the nut.

[0052] In some embodiments, the pivot further includes a prism protruding from an end surface of the second flat-head portion, and the nut forms a second positioning recess engaging with the prism. [0053] In some embodiments, the baby carrier further includes a second swing locking mechanism, and the second swing locking mechanism is operatively connected to the limiting member.

[0054] In some embodiments, a clamping part is disposed on a top, proximate to the groove opening, of the limiting member.

[0055] The second swing locking mechanism includes a second releasing member and an engaging member; the engaging member fits over a rotation shaft parallel to the pivot; an engaging boss and an evading portion are arranged on an outer periphery of the engaging member; the second releasing member is configured to drive the engaging member to rotate.

[0056] When the engaging boss rotates to a position where the engaging boss abuts against the clamping part, the limiting member moves towards the groove bottom; and when the evading portion rotates to a position where the evading portion abuts against the top of the limiting member, the limiting member moves towards the groove opening.

[0057] In some embodiments, the second swing locking mechanism further includes a first linking member; the first linking member is connected between the engaging member and the second releasing member, and the second releasing member drives the engaging member to rotate through the first linking member.

[0058] In some embodiments, the first linking member has a curved shape, and one of a first end of the first linking member and the second releasing member is provided with a first connecting pin, and another of the first end of the first linking member and the second releasing member has a second elongated hole slidably engaging with the first connecting pin.

[0059] A connecting lug is arranged on the engaging member; one of a second end of the first linking member and the connecting lug is provided with a second connecting pin, and another of the second end of the first linking member and the connecting lug has a third elongated hole slidably engaging with the second connecting pin.

[0060] In some embodiments, the main frame further includes a second mounting housing, and the second swing locking mechanism and the rotation shaft are installed in the second mounting housing. [0061] The second releasing member includes a second push block, and the second mounting housing includes a third opening allowing the second push block to move.

[0062] The fixing member is located inside the second mounting housing, and the second mounting housing includes a fourth opening allowing the swing arm to pass through.

[0063] In some embodiments, an extension direction of the limiting groove is parallel to an axial direction of the pivot, and the pivot is arranged to pass through the limiting groove.

[0064] In some embodiments, the limiting member includes a first region and a second region; the first region has the first limiting surface and the second limiting surface; the second region is adapted to engage with the abutting member to lock the swing arm.

[0065] The limiting member slidably engages with the limiting groove and has a first position and a second position; when the limiting member is at the first position, the first region engages with the abutting member; and when the limiting member is at the second position, the second region engages with the abutting member.

[0066] In some embodiments, the limiting member includes a force receiving plate and at least one ami extending from the force receiving plate, and the first region and the second region are formed on the at least one arm.

[0067] In some embodiments, the abutting member is provided with at least one first groove portion, each first groove portion includes a first end wall and a second end wall opposite to each other.

[0068] The at least one arm is adapted to pass through the at least one first groove portion; when the first end walls swing to abut against respective first limiting surfaces, the swing arm is prevented from continuing to swing in a first direction; and when the second end walls swing to abut against respective second limiting surfaces, the swing arm is prevented from continuing to swing in a second direction.

[0069] In some embodiments, the abutting member is further provided with at least one second groove portion, and the at least one second groove portion is adapted to engage with a corresponding second region.

[0070] In some embodiments, the at least one second groove portion is formed at a groove bottom of the at least one first groove portion. A first clamping block is arranged on the second region of the at least one arm; and the first clamping block is adapted to engage with a corresponding second groove portion.

[0071] In some embodiments, the at least one first groove portion and the at least one second groove portion coincide with each other. The second region of the at least one arm includes a second clamping block; and the second clamping block is adapted to engage with a corresponding first groove portion. [0072] In some embodiments, the limiting groove has a groove opening and a groove bottom; the force receiving plate is adjacent to the groove bottom, and the abutting member is adjacent to the groove opening.

[0073] A third elastic element is arranged in the limiting groove, and configured to apply a driving force to the force receiving plate to force the force receiving plate to move towards the groove bottom. [0074] The baby carrier further includes a third swing locking mechanism; and the third swing locking mechanism is operatively connected to the force receiving plate to drive the limiting member to be switched between the first position and the second position. [0075] In some embodiments, the third swing locking mechanism includes a driving wheel fitting over the pivot and abutting against a side, facing the groove bottom, of the force receiving plate.

[0076] One of a wall of the limiting groove and the driving wheel is provi ded with ratchet portions, and another of the wall of the limiting groove and the driving wheel is provided with a ratchet groove part; the ratchet groove part includes a first ratchet groove having a first groove depth and a second ratchet groove having a second groove depth, which are sequentially arranged circumferentially; the first groove depth is not equal to the second groove depth; and the driving wheel moves axially and rotates circumferentially when receiving a pressing force, and the ratchet portion engages with the first ratchet groove and the second ratchet groove in sequence.

[0077] In some embodiments, a mounting hole is formed in the groove bottom of the limiting groove. [0078] The third swing locking mechanism further includes a press member; the press member has a pressing portion, and a pushing portion extending from the pressing portion; and the pushing portion extends into the limiting groove through the mounting hole; and the pushing portion is configured to apply the pressing force to a bevel of the first ratchet groove or to a bevel of the second ratchet groove. [0079] In some embodiments, the third swing locking mechani sm further includes a restoring spring, and the restoring spring is configured to drive the press member to reset.

[0080] The pushing portion includes at least one pushing arm extending from the pressing portion; a pushing step is formed in a middle of each pushing arm, and a hook is formed at each end of the pushing arm; the driving wheel is located between the pushing step and the hook; and the pushing step is configured to apply the pressing force, and the hook is configured to hook the driving wheel after the pressing force is withdrawn.

[0081] In some embodiments, the ratchet portions are formed on the wall of the limiting groove, and the ratchet groove part is formed on the driving wheel.

[0082] In some embodiments, the wall of the limiting groove has a first axial guiding portion, and the first axial guiding portion is configured to guide the limiting member to move axially.

[0083] In some embodiments, the main frame is provided with a support pipe, and the support pipe has a first through hole; an axis of the first through hole is perpendicular to an axis of the support pipe; the fixing member is sleeved inside the first through hole; and a second axial guiding portion is formed on a hole wall of the first through hole, and configured to guide an axial movement of the fixing member during an installation.

[0084] In some embodiments, the swing bracket assembly further includes an auxiliary swing arm, and the auxiliary swing arm is configured to assist the swing ami in supporting the seat.

[0085] In some embodiments, the swing bracket assembly further includes a connector; the swing arm and the auxiliary swing arm each are pivotally connected to the connector; and a locking portion is arranged on the connector, and configured to engage with the seat.

[0086] In some embodiments, the main frame further includes a third mounting housing, and the fixing member is located inside the third mounting housing; a limiting recess is formed on an outer side of the third mounting housing; the limiting recess has a first limiting wall and a second limiting wall, and the swing arm is configured to swing between the first limiting wall and the second limiting wall.

[0087] In some embodiments, the swing bracket assembly is pivotally connected to the main frame; the seat is pivotally connected to the swing bracket assembly; the seat is configured to swing relative to the main frame by means of the swing bracket assembly.

[0088] The baby carrier further includes a seat retaining mechanism arranged between the main frame and the seat; and the seat retaining mechanism is configured to control the seat to remain horizontal during a swing.

[0089] In some embodiments, the main frame has a first pivot portion, and the seat has a second pivot portion; the first pivot portion and the second pivot portion each are pivotally connected to the swing bracket assembly.

[0090] When the swing bracket assembly swings around the first pivot portion for a first angle in one direction, the seat, under an action of the seat retaining mechanism, swings around the second pivot portion for the first angle in another opposite direction.

[0091] In some embodiments, the swing bracket assembly includes a swing housing, and the first pivot portion and the second pivot portion each are pivotally connected to the swing housing.

[0092] In some embodiments, the seat retaining mechanism is mounted on the swing bracket assembly and connected between the first pivot portion and the second pivot portion.

[0093] In some embodiments, the first pivot portion includes a first tooth portion, and the second pivot portion includes a second tooth portion; the seat retaining mechanism includes a gear transmission system; and the first tooth portion and the second tooth each mesh with the gear transmission system.

[0094] In some embodiments, the main frame includes a fourth mounting housing, and the swing housing has a first receiving portion.

[0095] The first pivot portion includes a mounting portion and a first pivoting ring; the mounting portion is arranged inside the fourth mounting housing, and the mounting portion is sleeved inside the first pivoting ring, and the mounting portion and the first pivoting ring are un-rotatable relative to each other; and the first pivoting ring is sleeved inside the first receiving portion.

[0096] In some embodiments, a first tooth portion is formed on at least part of an outer peripheral wall of the first pivoting ring; the second pivot portion 38 includes a second tooth portion; and the first tooth portion meshes with the second tooth portion through a gear transmission system.

[0097] In some embodiments, the swing housing has a first receiving portion, and the first pivot portion includes a first pivoting ring sleeved inside the first receiving portion.

[0098] The baby carrier further includes a first axial limiting mechanism, and the first axial limiting mechanism is configured to limit an axial movement of the first pivoting ring relative to the swing housing.

[0099] In some embodiments, the first axial limiting mechanism includes a limiting step and an elastic stopping block formed on a wall of the first receiving portion, and the first pivoting ring is clamped between the limiting step and the elastic stopping block.

[0100] In some embodiments, a first guiding groove is formed on an outer peripheral wall of the first pivoting ring, and during an installation of the first pivoting ring and the swing housing, the elastic stopping block slidably engages with the first guiding groove; and a groove depth and/or a width of the first guiding groove gradually becomes larger along an installation direction of the first pivoting ring.

[0101] In some embodiments, the baby carrier further includes a first swing limiting mechanism, and the first swing limiting mechanism is configured to restrict a swing angle of the swing housing relative to the main frame.

[0102] In some embodiments, the swing housing has a first receiving portion, and the first pivot portion includes a first pivoting ring sleeved inside the first receiving portion.

[0103] The first swing limiting mechanism includes a first groove and a first stopping portion; the first groove is formed on one of a wall of the first receiving portion and an outer peripheral wall of the first pivoting ring; the first stopping portion is arranged on another of the wall of the first receiving portion and the outer peripheral wall of the first pivoting ring, and the first stopping portion is configured to extend into the first groove; and when the swing housing swings, the first stopping portion abuts against one of two end walls of the first groove selectively.

[0104] In some embodiments, the mounting portion is column-shaped, and a projecting rib and a second guiding groove, engaging in a manner of a concave-convex fit, are provided between the mounting portion and the first pivoting ring.

[0105] The mounting portion is column-shaped, a first elastic arm is arranged on an outer peripheral wall of the mounting portion, and the first elastic arm has a projecting finger; a locking portion is formed on an inner peripheral wall of the first pivoting ring, and the locking portion is configured to abut against the projecting finger to prevent the first pivoting ring from being detached from the mounting portion.

[0106] In some embodiments, the swing housing has a second receiving portion.

[0107] The second pivot portion includes a second pivoting ring, and the second pivoting ring is fixedly connected to the seat; and the second pivoting ring is sleeved inside the second receiving portion.

[0108] In some embodiments, the second tooth portion is formed on at least part of an outer peripheral wall of the second pivoting ring; the first pivot portion includes a first tooth portion, and the second tooth portion, meshes with the first tooth portion through a gear transmission system.

[0109] In some embodiments, the baby carrier further includes a second axial limiting mechanism, wherein the second axial limiting mechanism is configured to restrict an axial movement of the swing housing relative to the second pivoting ring.

[0110] In some embodiments, the second axial limiting mechanism includes a second elastic arm located in the second receiving portion, and the second elastic arm is configured to pass through an inner hole of the second pivoting ring to engage with an edge of the inner hole.

[0111] In some embodiments, the baby carrier further includes a second swing limiting mechanism, and the second swing limiting mechanism is configured to restrict a swing angle of the seat relative to the swing housing.

[0112] In some embodiments, the swing housing has a second receiving portion, and the second pivot portion includes a second pivoting ring sleeved inside the second receiving portion.

[0113] The second swing limiting mechanism includes a second groove and a second stopping portion; the second groove is formed on one of a wall of the second receiving portion and an outer peripheral wall of the second pivoting ring; the second stopping portion is arranged on another of the wall of the second receiving portion and the outer peripheral wall of the second pivoting ring; the second stopping portion is configured to extend into the second groove; and when the swing housing swings, the second stopping portion abuts against one of two end walls of the second groove selectively.

[0114] In some embodiments, the baby carrier further includes a fourth swing locking mechanism for locking or releasing a swing of the seat.

[0115] In some embodiments, the first pivot portion includes a first tooth portion, and the second pivot portion includes a second tooth portion; the seat retaining mechanism includes a gear transmission system; the first tooth portion and the second tooth portion each mesh with the gear transmission system. [0116] The gear transmission system includes a driving gear, and a limiting groove is formed on the driving gear.

[0117] The fourth swing locking mechanism is installed on the swing housing and includes a fourth releasing member and a locking block; the locking block is adapted to be inserted into the limiting groove; and the fourth releasing member is operatively connected to the locking block to drive the locking block to be detached from the limiting groove.

[0118] In some embodiments, the fourth swing locking mechanism further includes a driving member; the locking block is installed on the driving member; and the fourth releasing member is configured to drive the locking block through the driving member.

[0119] In some embodiments, the fourth releasing member slidably engages with the swing housing; the driving member slidably engages with the swing housing; and a sliding direction of the fourth releasing member and a sliding direction of the driving member intersect.

[0120] In some embodiments, the driving member has a third connecting hole, and the third connecting hole has a third sloping wall.

[0121] The swing housing has a seventh elongated hole; the fourth releasing member has an operating portion and a third column extending from the operating portion; the third column is configured to enter the third connecting hole through the seventh elongated hole.

[0122] When the fourth releasing member moves from a locking position to an unlocking position, the third column pushes the third sloping wall to enable the driving member to drive the locking block to be detached from the limiting groove.

[0123] In some embodiments, one end of the third sloping wall has a third limiting portion, and the third limiting portion is configured to engage with the third column to keep the fourth releasing member in the unlocking position.

[0124] Elastic claws are arranged in a hole wall of the seventh elongated hole; and when the fourth releasing member moves to the locking position, the elastic claws clamp the third column to keep the fourth releasing member at the locking position.

[0125] In some embodiments, the driving member includes a first side portion and a second side portion opposite to each other, and a third side portion connected between the first side portion and the second side portion.

[0126] The driving gear is located between the first side portion and the second side portion, and the locking block is arranged on the third side portion.

[0127] In some embodiments, the fourth swing locking mechanism further includes a fourth elastic element, and the fourth elastic element is configured to drive the locking block to be inserted into the limiting groove.

[0128] In some embodiments, the driving gear includes a third tooth part meshing with the first tooth portion and a fourth tooth part meshing with the second tooth portion, and the limiting groove is located between the third tooth part and the fourth tooth part.

[0129] In some embodiments, the first pivot portion includes a first pivoting ring arranged inside the swing housing, and the second pivot portion includes a second pivoting ring arranged in the swing housing.

[0130] The seat retaining mechanism includes a first wrapping cable, and the first wrapping cable fits over the first pivoting ring and the second pivoting ring.

[0131] In some embodiments, a first annular groove is formed on an outer peripheral wall of the first pivoting ring, the first wrapping cable is wound around the first annular groove, and a first io positioning mechanism is arranged between the first wrapping cable and the first pivoting ring.

[0132] A second annular groove is formed on an outer peripheral wall of the second pivoting ring, and the first wrapping cable is wound around the second annular groove, and a second positioning mechanism is arranged between the first wrapping cable and the second pivoting ring.

[0133] In some embodiments, the seat retaining mechanism includes an intermediate member arranged on the swing housing; the first pivot portion includes a first pivoting ring arranged inside the swing housing; the second pivot portion includes a second pivoting ring arranged inside the swing housing.

[0134] The seat retaining mechanism further includes a second wrapping cable and a third wrapping cable; the second wrapping cable fits over one position of the intermediate member and over the first pivoting ring, and the third wrapping cable fits over another position of the intermediate member and over the second pivoting ring.

[0135] In some embodiments, a third annular groove is formed on an outer peripheral wall of the first pivoting ring, and a fourth annular groove and a fifth annular groove are axially spaced and formed on an outer peripheral wall of the intermediate member, and a sixth annular groove is formed on an outer peripheral wall of the second pivoting ring.

[0136] The second wrapping cable is wound around the third annular groove and the fourth annular groove, and the third wrapping cable is wound around the fifth annular groove and the sixth annular groove.

[0137] In some embodiments, a third positioning mechanism is arranged between the second wrapping cable and the first pivoting ring, and a fourth positioning mechanism is arranged between the second wrapping cable and the intermediate member.

[0138] A sixth positioning mechanism is arranged between the third wrapping cable and the sixth annular groove.

[0139] In some embodiments, a fifth positioning mechanism is arranged between the third wrapping cable and the fifth annular groove.

[0140] In some embodiments, the seat retaining mechanism includes a sliding pin and a sliding groove.

[0141] The sliding pin is disposed on one of the main frame and the seat;

[0142] The sliding groove is disposed on another of the main frame and the seat;

[0143] When the swing bracket assembly swings relative to the main frame, the sliding pin and the sliding groove slidably engage with each other and control the seat to remain horizontal during a swing.

[0144] In some embodiments, the sliding pin is parallel to a swing axis of the seat, and/or the sliding groove is a curved groove.

[0145] In some embodiments, a locking hole is formed in the sliding groove.

[0146] The sliding pin has a locking position at which the sliding pin extends into the locking hole, and has an unlocking position at which the sliding pin retracts from the locking hole; when the sliding pin is at the locking position, the swing of the seat is locked; and when the sliding pin is at the unlocking position, the swing of the seat is released.

[0147] In some embodiments, the baby carrier further includes a fifth swing locking mechanism, and the fifth swing locking mechanism is configured to control an extension and retraction of the sliding pin to lock or release the swing of the seat.

[0148] In some embodiments, the fifth swing locking mechanism includes a fifth releasing member and a fifth elastic element; the fifth releasing member is configured to drive the sliding pin to retract from the locking hole; and the fifth elastic element is configured to drive the sliding pin to be inserted into the locking hole.

[0149] In some embodiments, a second annular flange is arranged in a middle of the sliding pin; the second annular flange divides the sliding pin into a first part and a second part; the first part is configured to be inserted into the locking hole; the fifth elastic element fits over the second part.

[0150] The fifth releasing member has an eighth elongated hole; a second stopping boss extending obliquely is formed on a hole wall of the eighth elongated hole; and the second annular flange is clamped between the second stopping boss and the fifth elastic element.

[0151] In some embodiments, a locking protrusion is further formed on the hole wall of the eighth elongated hole, and the locking protrusion is configured to engage with the sliding pin to keep the fifth releasing member at the unlocking position.

[0152] In some embodiments, the main frame includes a fourth mounting housing.

[0153] A first connecting member is installed on the swing bracket assembly, and pivotally connected to the swing bracket assembly.

[0154] The first connecting member is configured to be locked in the fourth mounting housing.

[0155] In some embodiments, the fourth mounting housing includes a first clamping recess.

[0156] The first connecting member includes a first locking platform; the first locking platform is adapted to be inserted into the first clamping recess; and a first engaging mechanism is arranged between the first locking platform and the first clamping recess.

[0157] In some embodiments, the main frame includes a fourth mounting housing.

[0158] The seat retaining mechanism includes a sliding pin and a sliding groove; the sliding pin is installed on a second connecting member; the second connecting member engages with the fourth mounting housing; the sliding groove is formed on the seat, and the sliding pin is arranged to pass through the sliding groove.

[0159] When the swing bracket assembly swings relative to the main frame, the sliding pin and the sliding groove slidably engage to control the seat to remain horizontal during a swing.

[0160] In some embodiments, the fourth mounting housing includes a second clamping recess.

[0161] The second connecting member includes a second locking platform; the second locking platform is adapted to be inserted into the second clamping recess; and a second engaging mechanism is provided between the second locking platform and the second clamping recess.

[0162] In some embodiments, the sliding pin is a bolt, and a tail end of the bolt is configured to pass through the second connecting member and the sliding groove and to be connected to a nut.

[0163] On another aspect, the present application provides a swing mechanism, including: a fixing member, a swing arm, and an abutting member.

[0164] The fixing member has a first limiting surface and a second limiting surface.

[0165] The swing arm has a pivot pivotable relative to the fixing member.

[0166] The abutting member is connected to the pivot and arranged between the first limiting surface and the second limiting surface. The abutting member restricts a swing angle of the swing arm by abutting against the first limiting surface and the second limiting surface.

[0167] In some embodiments, the fixing member includes a limiting groove.

[0168] The first limiting surface and the second limiting surface are formed on a side wall of the limiting groove; or a limiting member is provided in the limiting groove, and the first limiting surface and the second limiting surface are formed on the limiting member. [0169] In some embodiments, an extension direction of the limiting groove is perpendicular to an axial direction of the pivot, and the limiting groove has a groove opening.

[0170] A side wall of the limiting groove includes a first side wall and a second side wall parallel to each other, and the first limiting surface and the second limiting surface both are formed on the first side wall, and both are formed on the second side wall.

[0171] The abutting member is configured to be inserted into the limiting groove through the groove opening, and includes a first parallel surface pair and a second parallel surface pair.

[0172] When swinging to abut against the first limiting surfaces, the first parallel surface pair prevents the swing arm from continuing to swing in a first direction; and when swinging to abut against the second limiting surfaces, the second parallel surface pair prevents the swing arm from continuing to swing in a second direction which is opposite to the first direction.

[0173] In some embodiments, an extension direction of the limiting groove is perpendicular to an axial direction of the pivot, and a position of the limiting member inside the limiting groove is adjustable.

[0174] The limiting member includes an opening allowing the pivot to pass through, the opening includes a first hole portion and a second hole portion; the first hole portion includes a first wall and a second wall, and the first limiting surface and the second limiting surface both are formed on the first wall, and both are formed the second wall; and the second hole portion is configured to engage with the abutting member to lock the swing arm.

[0175] In some embodiments, an extension direction of the limiting groove is parallel to an axial direction of the pivot.

[0176] The limiting member includes a first region and a second region; the first region has the first limiting surface and the second limiting surface; the second region is adapted to engage with the abutting member to lock the swing arm.

[0177] The limiting member slidably engages with the limiting groove and has a first position and a second position; when the limiting member is at the first position, the first region engages with the abutting member; and when the limiting member is at the second position, the second region engages with the abutting member.

[0178] In some embodiments, the limiting member includes a force receiving plate and at least one arm extending from the force receiving plate, and the first region and the second region are formed on the at least one arm.

[0179] At least one first groove portion is formed on an outer periphery of the abutting member, the at least one arm passes through the at least one first groove portion, and the first region is adapted to swing in a corresponding first groove portion.

[0180] At least one second groove portion is further formed on the abutting member, and the second region is adapted to engage with a corresponding second groove portion.

[0181] In some embodiments, the baby carrier further includes a driving wheel fitting over the pivot and abutting against the force receiving plate.

[0182] One of a wall of the limiting groove and the driving wheel is provided with ratchet portions, and another of the wall of the limiting groove and the driving wheel is provided with a ratchet groove part; the ratchet groove part includes a first ratchet groove having a first groove depth and a second ratchet groove having a second groove depth, which are sequentially arranged circumferentially; the first groove depth is not equal to the second groove depth; and when receiving a pressing force, the driving wheel moves axially and rotates circumferentially, and the ratchet portion engages with the first ratchet groove and the second ratchet groove in sequence.

[0183] On yet another aspect, the present application provides a seat connecting structure. The seat connecting structure includes a support frame, a first positioning groove and a second positioning groove, and a locking device.

[0184] The support frame includes a first support rod and a second support rod arranged to be opposite to each other.

[0185] The first positioning groove and the second positioning groove are formed on a first surface of the seat, the first positioning groove is configured to receive the first support rod, and the second positioning groove is configured to receive the second support rod.

[0186] The locking device includes a first blocking member, a second blocking member and an elastic element; the first blocking member and the second blocking member each slidably engage with the seat; and the elastic element is configured to drive the first blocking member and the second blocking member to be at a locking position.

[0187] In some embodiments, a second surface of the seat includes a first sliding groove and a second sliding groove; the first sliding groove intersects with the first positioning groove; the second sliding groove intersects with the second positioning groove; the second surface of the seat and the first surface of the seat face away from each other.

[0188] The first blocking member is slidably disposed in the first sliding groove, and the second blocking member is slidably disposed in the second sliding groove.

[0189] In some embodiments, the seat further has a third sliding groove, and the first sliding groove and the second sliding groove communi cate by means of the third sliding groove.

[0190] The locking device further includes a connecting bracket; the connecting bracket is disposed in the third sliding groove; two ends of the connecting bracket are respectively provided with a first surface and a second surface each bent downwards relative to the connecting bracket; the first blocking member is connected to the first surface, and the second blocking member is connected to the second surface.

[0191] A bottom wall of the third sliding groove includes a fourth elongated hole; a fastener is installed inside the connecting bracket; and a first end of the fastener is configured to passes through and goes out of the fourth elongated hole.

[0192] In some embodiments, the first surface of the seat further includes a fourth sliding groove; the fourth sliding groove and the third sliding groove are adj cent in an extension direction of the fastener; the fourth sliding groove is located between the first sliding groove and the second sliding groove.

[0193] The locking device further includes a third releasing member; the third releasing member is received in the fourth sliding groove; the first end of the fastener is connected to the third releasing member.

[0194] The elastic element is clamped between a side wall of the fourth sliding groove and the third releasing member.

[0195] In some embodiments, a first end of the third releasing member includes a first receiving groove; the first receiving groove is configured to receive an end of the elastic element; a second end of the third releasing member is provided with a pressing recess.

[0196] Part region of the fourth sliding groove is provided with a shielding plate, and the shielding plate shields the elastic element.

[0197] In some embodiments, the locking device further includes a second linking member; the second linking member is operatively connected to the first blocking member and the second blocking member; when one of the first blocking member and the second blocking member is pushed to release one of the first support rod and the second support rod, another of the first blocking member and the second blocking member, under an action of the second linking member, is pushed to release another of the first support rod and the second support rod.

[0198] In some embodiments, the second surface of the seat has a main groove; the main groove intersects with the first positioning groove and the second positioning groove, respectively; the second surface of the seat and the first surface of the seat face away from each other.

[0199] The first blocking member and the second blocking member are slidably arranged in the main groove.

[0200] In some embodiments, a first end of the first blocking member and a first end of the second blocking member, which are far away from each other, are configured to lock the first support rod and the second support rod, respectively.

[0201] A first connecting boss is arranged on a second end of the first blocking member, and a second connecting boss is arranged on a second end of the second blocking member, and the second end of the first blocking member and the second end of the second blocking member are proximate to each other.

[0202] The second linking member is a rod; a first end of the second linking member is pivotally connected to the first connecting boss; and a second end of the second linking member is pivotally connected to the second connecting boss.

[0203] In some embodiments, the elastic element includes a first spring and a second spring; the first spring is arranged between an end of the first connecting boss and the second blocking member; and the second spring is arranged between an end of the second connecting boss and the first blocking member.

[0204] In some embodiments, a first end of the second linking member is provided with a first protruding column, and a second end of the second linking member is provided with a second protruding column.

[0205] The first connecting boss includes a fifth elongated hole slidably engaging with the first protruding column; the second connecting boss includes a sixth elongated hole slidably engaging with the second protruding column.

[0206] A first recess is formed on the first connecting boss; a first end of the second linking member is received in the first recess; the first protruding column is configured to enter the fifth elongated hole through the first recess.

[0207] A second recess is formed on the second connecting boss; a second end of the second linking member is received in the second recess; and the second protruding column is configured to enter the sixth elongated hole through the second recess.

[0208] In some embodiments, a first wedge and a second wedge are arranged on a side wall of the main groove; the first wedge is configured to abut against the first blocking member; and the second wedge is configured to abut against the second blocking member.

[0209] A first end of the first blocking member and a first end of the second blocking member, which are far away from each other, are provided with a pushing bevel, respectively.

BRIEF DESCRIPTION OF THE DRAWINGS

[0210] FIG. 1 illustratively shows a perspective view of a baby carrier according to a first embodiment of the present disclosure;

[0211] FIG. 2 illustratively shows a side view of the baby carrier according to the first embodiment of the present disclosure;

[0212] FIG. 3 illustratively shows a perspective view of a seat of the baby carrier according to the first embodiment of the present disclosure, where a safety fence at one side is not shown;

[0213] FIG. 4 illustratively shows a perspective view of a main frame of the baby carrier according to the first embodiment of the present disclosure;

[0214] FIG. 5 illustratively shows a partial sectional view along A -A in FIG. 4;

[0215] FIG. 6 illustratively shows a partial sectional view at a pivot of the baby carrier according to the first embodiment of the present disclosure;

[0216] FIG. 7 is an exploded view in one direction illustratively showing a structure of a connection between a support pipe and a swing arm of the baby carrier according to the first embodiment of the present disclosure;

[0217] FIG. 8 illustratively shows a partial perspective view of a first mounting housing and a first releasing member of the baby carrier according to the first embodiment of the present disclosure;

[0218] FIG. 9 is an exploded view in another direction illustratively showing the structure of the connection between the support pipe and the swing arm of the baby carrier according to the first embodiment of the present disclosure;

[0219] FIG. 10 illustratively shows a perspective view of a pivot, a first shaft sleeve, an abutting member and a first limiting structure of the baby carrier according to the first embodiment of the present disclosure;

[0220] FIG. 11 illustratively shows a sectional view along B-B in FIG. 6, where the first releasing member is at an unlocking position, and the swing arm swings to a boundary position;

[0221] FIG. 12 illustratively shows a sectional view along B-B in FIG. 6, where the first releasing member is at the unlocking position, and the swing arm swings to another boundary position;

[0222] FIG. 13 illustratively shows a sectional view along B-B in FIG. 6, where the first releasing member is at the locking position, and a swing of the swing arm is locked;

[0223] FIG. 14 illustratively shows a perspective view of the main frame of the baby carrier according to a second embodiment of the present disclosure;

[0224] FIG. 15 illustratively shows a partial sectional view at the pivot of the baby carrier according to the second embodiment of the present disclosure;

[0225] FIG. 16 is an exploded view in one direction illustratively showing the structure of the connection between the support pipe and the swing arm of the baby carrier according to the second embodiment of the present disclosure;

[0226] FIG. 17 is an exploded view in another direction illustratively showing the structure of the connection between the support pipe and the swing arm of the baby carrier according to the second embodiment of the present disclosure;

[0227] FIG. 18 illustratively shows a side view of the connection between the support pipe and the swing arm of the baby carrier according to the second embodiment of the present disclosure, where, for convenience of illustration, a fourth housing portion is not shown in the figure, and the second releasing member is at the unlocking position;

[0228] FIG. 19 illustratively shows another side view of the connection between the support pipe and the swing arm of the baby carrier according to the second embodiment of the present disclosure, where, for convenience of illustration, the fourth housing portion is not shown in the figure, and the second releasing member is at the locking position;

[0229] FIG. 20 illustratively shows a sectional view along C-C in FIG. 15, where the second releasing member is at the unlocking position;

[0230] FIG. 21 illustratively shows a sectional view along C-C in FIG. 15, where the second releasing member is at the locking position;

[0231] FIG. 22 illustratively shows an exploded view of a seat connecting structure in a top-view direction according to a third embodiment of the present disclosure;

[0232] FIG. 23 illustratively shows an exploded view of the seat connecting structure in a bottomview direction according to the third embodiment of the present disclosure;

[0233] FIG. 24 illustratively shows a partial bottom view of the seat connecting structure according to the third embodiment of the present disclosure, where the locking device is in the locking state;

[0234] FIG. 25 illustratively shows a sectional view along D-D in FIG. 24;

[0235] FIG. 26 illustratively shows a partial sectional view of the seat connecting structure according to the third embodiment of the present disclosure, where the locking device is in the unlocking state;

[0236] FIG. 27 illustratively shows a sectional view along E-E in FIG. 26;

[0237] FIG. 28 illustratively shows an exploded view of the seat connecting structure in a top-view direction according to a fourth embodiment of the present disclosure;

[0238] FIG. 29 illustratively shows an exploded view of the seat connecting structure in a bottomview direction according to the fourth embodiment of the present disclosure;

[0239] FIG. 30 illustratively shows a partial bottom view of the seat connecting structure according to the fourth embodiment of the present disclosure, where the locking device is in the locking state;

[0240] FIG. 31 illustratively shows a sectional view along F-F in FIG. 30;

[0241] FIG. 32 illustratively shows a partial sectional view of the seat connecting structure according to the fourth embodiment of the present disclosure, where the locking device is in the unlocking state;

[0242] FIG. 33 illustratively shows a sectional view along G-G in FIG. 32;

[0243] FIG. 34 illustratively shows a side view of the baby carrier according to a fifth embodiment of the present disclosure, where a swing bracket assembly is in a starting position;

[0244] FIG. 35 i llustratively shows a side view of the baby carri er according to the fifth embodi ment of the present disclosure, where the swing bracket assembly swings forwards;

[0245] FIG. 36 illustratively shows a perspective view of the baby carrier according to the fifth embodiment of the present disclosure, where the swing bracket assembly swings backwards;

[0246] FIG. 37 illustratively shows a perspective view of the main frame of the baby carrier according to the fifth embodiment of the present disclosure;

[0247] FIG. 38 illustratively shows a sectional view along K-K in FIG. 37, where a swing of the swing arm is locked;

[0248] FIG. 39 illustratively shows a sectional view along K-K in FIG. 37, where the swing of the swing arm is released;

[0249] FIG. 40 illustratively shows a three-dimensional exploded view of the connection between the support pipe and the swing arm of the baby carrier according to the fifth embodiment of the present disclosure;

[0250] FIG. 41 illustratively shows a perspective view of a fixing member of the baby carrier according to the fifth embodiment of the present disclosure; [0251] FIG. 42 illustratively shows a perspective view of an abutting member of the baby carrier according to the fifth embodiment of the present disclosure;

[0252] FIG. 43 illustratively shows a perspective view of a limiting member of the baby carrier according to the fifth embodiment of the present disclosure;

[0253] FIG. 44 illustratively shows a partial perspective view of the abutting member, the limiting member and the swing arm of the baby carrier according to the fifth embodiment of the present disclosure;

[0254] FIG. 45 illustratively shows a perspective view of the abutting member, the limiting member and the swing arm of the baby carrier according to the fifth embodiment of the present disclosure, where the limiting member is in a first position;

[0255] FIG. 46 illustratively shows a perspective view of the abutting member, the li miting member and the swing anu of the baby carrier according to the fifth embodiment of the present disclosure, where the limiting member is in a second position;

[0256] FIG. 47 illustratively shows a side view of a driving wheel of the baby carrier according to the fifth embodiment of the present disclosure;

[0257] FIG. 48 illustratively shows a perspective view of the driving wheel of the baby carrier according to the fifth embodiment of the present disclosure;

[0258] FIG. 49 illustratively shows a perspective view of a press member of the baby carrier according to the fifth embodiment of the present disclosure;

[0259] FIG. 50 illustratively shows a bottom perspective view of a seat of the baby carrier according to the fifth embodiment of the present disclosure;

[0260] FIG. 51 illustratively shows a perspective view of another example of the abutting member of the baby carrier according to the fifth embodiment of the present disclosure;

[0261] FIG. 52 illustratively shows a perspective view of another example of the limiting member of the baby carrier according to the fifth embodiment of the present disclosure;

[0262] FIG. 53 illustratively shows a sectional view along M-M in FIG. 37;

[0263] FIG. 54 illustratively shows a partial sectional view of a connection between the seat and a connector of the baby carrier according to the fifth embodiment of the present disclosure;

[0264] FIG. 55 illustratively shows a perspective view of the baby carrier according to a sixth embodiment of the present disclosure;

[0265] FIG. 56 illustratively shows a perspective view of the main frame of the baby carrier according to the sixth embodiment of the present disclosure;

[0266] FIG. 57 is an enlarged view of a portion I in FIG. 56;

[0267] FIG. 58 illustratively shows a perspective view of a swing bracket assembly of the baby carrier and internal components of the swing bracket assembly according to the sixth embodiment of the present disclosure;

[0268] FIG. 59 illustratively shows a partial perspective view of a safety fence and a second pivot portion of the baby carrier according to the sixth embodiment of the present disclosure;

[0269] FIG. 60 illustrati vely shows a perspective view of the seat and the swing bracket assembly of the baby carrier according to the sixth embodiment of the present disclosure;

[0270] FIG. 61 illustratively shows a front view of the seat and the swing bracket assembly of the baby carrier according to the sixth embodiment of the present disclosure;

[0271] FIG. 62 illustratively shows a sectional view along V-V in FIG. 61, where a fourth releasing member is at an unlocking position; [0272] FIG. 63 illustratively shows a sectional view along V-V in FIG. 61, where the fourth releasing member is at a locking position;

[0273] FIG. 64 illustratively shows an exploded view in one direction of the swing bracket assembly of the baby carrier and internal components of the swing bracket assembly according to the sixth embodiment of the present disclosure;

[0274] FIG. 65 illustratively shows an exploded view in another direction of the swing bracket assembly of the baby carrier and the internal components of the swing bracket assembly according to the sixth embodiment of the present disclosure;

[0275] FIG. 66 illustratively shows a side view of the baby carrier according to the sixth embodiment of the present disclosure, where the seat swings to the lowest position;

[0276] FIG. 67 illustratively shows a positional relationship of a first pivot portion, a driving gear and a second pivot portion in FIG. 66;

[0277] FIG. 68 illustratively shows a side view of the baby carrier according to the sixth embodiment of the present disclosure, where the seat swings backwards;

[0278] FIG. 69 illustratively shows a positional relationship of the first pivot portion, the driving gear and the second pivot portion in FIG. 68;

[0279] FIG. 70 illustratively shows a side view of the baby carrier according to the sixth embodiment of the present disclosure, where the seat swings forwards;

[0280] FIG. 71 illustratively shows a positional relationship of the first pivot portion, the driving gear and the second pivot portion in FIG. 70;

[0281] FIG. 72 illustratively shows a side view of the seat and the swing bracket assembly of the baby carrier according to the sixth embodiment of the present disclosure, where the fourth releasing member is at the locking position;

[0282] FIG. 73 illustratively shows a side view of the baby carrier according to a seventh embodiment of the present disclosure;

[0283] FIG. 74 illustratively shows a rear perspective view of the baby carrier according to the seventh embodiment of the present disclosure;

[0284] FIG. 75 illustratively shows an exploded view of the main frame and the seat of the baby carrier according to the seventh embodiment of the present disclosure;

[0285] FIG. 76 illustratively shows an exploded view of the first pivot portion of the main frame shown in FIG. 75;

[0286] FIG. 77 illustratively shows an assembly view of the swing bracket assembly and the first pivoting ring in FIG. 73;

[0287] FIG. 78 illustratively shows a sectional view along Ul-Ul in FIG. 73, and an enlarged view showing that a sliding pin is in a sliding groove and not inserted in a locking hole;

[0288] FIG. 79 is an enlarged view illustratively showing the sliding pin in FIG. 78 inserted into the locking hole;

[0289] FIG. 80 illustratively shows an exploded view of some components of the baby carrier in FIG. 73, and a structure of the swing bracket assembly which is the same swing bracket assembly shown in FIG. 77;

[0290] FIG. 81 illustratively shows an exploded view in another direction of the components shown in FIG. 80, where the seat is not shown in FIG. 81;

[0291] FIG. 82 illustratively shows a partial internal structure of a fourth mounting housing shown in FIG. 80; [0292] FIG. 83 to FIG. 85 illustratively show side views of the baby carrier, which include sectional views along U3-U3 in FIG. 78, and a swing process of the seat, where the swing bracket assembly is the same swing bracket assembly shown in FIG. 80 and FIG. 81;

[0293] FIG. 86 illustratively shows a partial sectional view along U2-U2 in FIG. 73 and a modification of the swing bracket assembly;

[0294] FIG. 87 illustratively shows a sectional view along U4-U4 in FIG. 86;

[0295] FIG. 88 is an exploded view illustratively showing part of the seat, the swing bracket assembly and the first pivoting ring of the baby carrier shown in FIG. 86;

[0296] FIG. 89 i llustratively shows an exploded view in another direction of the components shown in FIG. 88, where the seat is not shown in FIG. 89;

[0297] FIG. 90 to FIG. 92 illustratively show side views of the baby carrier having the seat shown in FIG. 87, and the swing process of the seat, where a swing housing is not shown in the figure;

[0298] FIG. 93 illustratively shows a partial sectional view along U2-U2 in FIG. 73, and another modification of the swing bracket assembly;

[0299] FIG. 94 illustratively shows a sectional view along U5-U5 in FIG. 93;

[0300] FIG. 95 is an exploded view illustratively showing part of the seat, the swing bracket assembly and the first pivoting ring of the baby carrier shown in FIG. 93;

[0301] FIG. 96 illustratively shows an exploded view in another direction of the components shown in FIG. 95, where the seat is not shown in FIG. 96;

[0302] FIG. 97 to FIG. 99 illustratively show side views of the baby carrier having the seat shown in FIG. 94, and show the swing process of the seat, where the swing housing is not shown in the figure;

[0303] FIG. 100 illustratively shows a rear perspective view of the baby carrier according to an eighth embodiment of the present disclosure;

[0304] FIG. 101 illustratively shows a perspective view of the main frame in FIG. 100, and a partially enlarged view of a fourth mounting housing;

[0305] FIG. 102 illustratively shows a perspective view of the seat in FIG. 100;

[0306] FIG. 103 illustratively shows an exploded view of the seat, the swing bracket assembly, a first connecting member, a second connecting member, and a first swing locking mechanism shown in FIG. 102;

[0307] FIG. 104 illustratively shows an exploded view in another direction of the components shown in FIG. 103, where the seat and the second connecting member are not shown in FIG. 104;

[0308] FIG. 105 illustratively shows an assembly view of the swing bracket assembly, the first connecting member, and the first swing locking mechanism in FIG. 100;

[0309] FIG. 106 illustratively shows a top view of the first swing locking mechanism in FIG. 105;

[0310] FIG. 107 illustratively shows a sectional view along U6-U6 in FIG. 105;

[0311] FIG. 108 is a view illustratively showing a connection between the second connecting member and the seat shown in FIG. 102;

[0312] FIG. 109 illustratively shows a rear perspective view of the baby carrier according to a ninth embodiment of the present disclosure;

[0313] FIG. 110 illustratively shows a rear perspective view of the seat and the swing bracket assembly in FIG. 109;

[0314] FIG. Il l is an exploded view illustratively showing part of the seat, the swing bracket assembly, the first connecting member, the second connecting member, and the first swing locking mechanism of the baby carrier shown in FIG. 110;

[0315] FIG. 112 illustratively shows an exploded view in another direction of components shown in FIG. Ill, where the seat and the second connecting member are not shown in FIG. 112;

[0316] FIG. 113 illustratively shows a perspecti ve view of the swing housing in FIG. 112;

[0317] FIG. 114 illustratively shows an assembly view of the swing bracket assembly, the first connecting member and the first swing locking mechanism in FIG. 112;

[0318] FIG. 115 illustratively shows a side view of components shown in FIG. 114, where the first releasing member is at the unlocking position;

[0319] FIG. 116 illustratively shows a sectional view along U7-U7 in FIG. 115; and

[0320] FIG. 117 illustratively shows a side view of the components shown in FIG. 114, where the first releasing member is at the locking position.

[0321] Reference signs:

1 main frame, la first clamping recess, lb second clamping recess, 101 front foot support, 102 rear foot support, 1031 front cross bar, 1032 rear cross bar, 104 folding member, 107 first connecting member, 1071 first locking platform, 1072 round table, 108 third axial limiting mechanism, 10a pivoting recess, 11 support pipe, 110 first through hole, 1101 hole, 1105 flange, 114 second axial guiding portion, 15 first mounting housing, 150 first sleeve portion, 1501 hole, 1503 third through hole, 1505 first opening, 1506 second opening, 151 first housing portion, 152 second housing portion, 1520 mounting hole, 1521 structure, 153 restoring spring, 154 operating button, 1541 pin shaft, 1542 mounting hole, 16 second mounting housing, 160 second sleeve portion, 1601 hole, 1605 third opening, 1606 fourth opening, 161 third housing portion, 162 fourth housing portion, 1621 structure, 163 restoring spring, 164 operating button, 1641 pin shaft, 1642 mounting holes, 169 rotation shaft,

17 third mounting housing, 170 third sleeve portion, 1701 limiting recess, 17011 first limiting wall, 17012 second limiting wall, 1702 limiting recess, 17021 third limiting arm, 17022 fourth limiting arm, 1703 hole, 1704 hole, 171 fifth housing portion, 1712 sleeve, 172 sixth housing portion, 1721 hole socket, 174 operating button, 178 first engaging mechanism, 1781 recess, 1782 boss, 179 screw,

18 fourth mounting housing, 180 fourth sleeve portion, 181 seventh housing portion, 1810 fourth through hole, 1811 shaft, 1812 hollow column, 182 eighth housing portion, 1820 mounting hole, 183 first pivot portion, 183a first positioning mechanism, 183b third positioning mechanism, 18301 positioning groove, 18302 groove, 18303 positioning groove, 1831 first tooth portion, 1832 mounting portion, 18321 second guiding groove, 18322 first elastic arm, 18323 projecting finger, 1833 first pivoting ring, 1833a first annular groove, 1833b third annular groove, 18331 first guiding groove, 18332 locking portion, 18333 projecting rib, 184 operating button, 189 screw;

2 swing bracket assembly, 2a first wrapping cable, 2b second wrapping cable, 2c third wrapping cable, 201 first shaft sleeve, 201 clamping block, 2011 axial guiding groove, 202 second shaft sleeve, 202a clamping block, 203a clamping block, 204a clamping block, 205a clamping block, 206a clamping block, 208 second connecting member, 2081 second locking platform, 2082 protective sleeve, 21 swing arm, 2101 first positioning recess, 2102 first step, 2103 second step, 2105 third step, 211 pivot, 2110 center hole, 2111 first flat-head portion, 2113 flat-head connecting portion, 2115 prism, 2116 locking groove, 2117 positioning groove, 219 pivot, 22 support frame, 221 first support rod, 222 second support rod, 223 first cross bar, 224 second cross bar, 225 third cross bar, 23 swing housing, 230 mounting hole, 2301 cover, 2302 fence, 2303 opening, 2305 first sideway, 2306 second sideway, 23061 inclined guiding wall, 23071 groove structure, 23072 opening, 2308 guiding structure, 2309 support column, 231 first receiving portion, 2311 first axial limiting mechanism, 23111 limiting step, 23112 elastic stopping block, 2312 a second axial limiting mechanism, 23121 second elastic arm, 231211 projecting finger, 232 second receiving portion, 233 seventh elongated hole, 2331 elastic claw, 235 intermediate member, 235a fourth positioning mechanism, 235b fifth positioning mechanism, 23501 fourth annular groove, 23502 fifth annular groove, 2351 column, 2352 wheel body, 2352a positioning groove, 2352b fifth positioning mechanism, 26 connecting piece, 260 third flat hole, 27 spring, 278 second positioning mechanism, 2781 recess, 2782 boss, 28 connector, 280 protrusion, 281 locking portion, 2810 mounting hole, 29 auxiliary swing arm, 291 pivot, 292 pivot, 293 shaft sleeve, 295 fastener;

3 seat, 30 locking hole, 304 main groove, 305 base, 306 safety fence, 3060 positioning groove, 3062 groove, 30621 locking hole, 307 back, 3071 seat portion, 308 dinner plate, 309 foot shelf, 3091 pivot, 31 first positioning groove, 32 second positioning groove, 33 first sliding groove, 331 third positioning groove, 332 fourth positioning groove, 333 fifth positioning groove, 34 second sliding groove, 35 third sliding groove, 351 fourth elongated hole, 36 fourth sliding groove, 361 shielding plate, 38 second pivot portion, 38a second positioning mechanism, 38b sixth positioning mechanism, 381 second tooth portion, 382 second pivoting ring, 382a second annular groove, 382b sixth annular groove, 3820 inner hole, 38201 positioning groove, 38202 positioning groove, 39 seat retaining mechanism, 391 gear transmission system, 3910 limiting groove, 3911 driving gear, 39111 third tooth part, 39112 fourth tooth part, 392 sliding pin, 3921 first part, 3922 second part, 3923 second annular flange, 3925 nut, 393 sliding groove;

4 swing limiting mechanism, 401 first side wall, 402 second side wall, 41 fixing member, 410 second through hole, 4101 axial guiding rib, 4106 step, 4107 protruding bar, 4108 step, 4109 limiting flange, 4111 first limiting surface, 4112 second limiting surface, 411 limiting groove, 41100 center hole, 41101 groove opening, 41102 groove bottom, 41103 mounting hole, 4113 first axial guiding portion, 41131 side wall, 4115 guiding portion, 4117 ratchet portion, 42 abutting member, 420 engaging opening, 421 first parallel surfaces pair, 422 second parallel surfaces pair, 423 first flat hole, 424 positioning hole, 425 first plane, 426 second plane, 427 first groove portion, 4271 first end wall, 4272 second end wall, 4273 groove bottom, 428 second groove portion, 43 limiting member, 43a first region, 43b second region, 430 opening, 4301 first hole portion, 43011 first wall, 43012 second wall, 4302 groove bottom, 4307 limiting portion, 4309 receiving recess, 431 clamping part, 435 force receiving plate, 4350 center hole, 4351 evading opening, 436 arm, 4363 first clamping block, 4365 second clamping block, 45 second elastic element, 46 third elastic element, 47 third swing locking mechanism, 471 driving wheel, 4710 center hole, 47101 bevel, 47102 bevel, 4711 ratchet groove part, 47111 first ratchet groove, 47112 second ratchet groove, 4713 projecting ring, 472 press member, 4721 pressing portion, 4722 pushing portion, 47220 pushing arm, 47221 pushing step, 47222 hook, 47223 protruding finger, 481 first swing limiting mechanism, 4810 first groove, 48101 end wall, 4811 first stopping portion, 482 second swing limiting mechanism, 4820 second groove, 48201 end wall, 4821 second stopping portion, 483 fourth swing locking mechanism, 4831 fourth releasing member, 48311 operating portion, 48312 third column, 4832 locking block, 48320 recess, 4833 driving member, 48330 third connecting hole, 483301 third sloping wall, 483302 third limiting portion, 48331 first side portion, 48332 second side portion, 48333 third side portion, 48338 receiving hole, 4834 fourth elastic element;

5 first limiting structure, 51 spring clip, 52 first positioning sleeve, 521 second flat hole, 522 radial through groove, 523 positioning column;

6 first swing locking mechanism, 6a fifth swing locking mechanism, 601 hole, 605 crank slider mechanism, 6051 cylinder, 6052 elongated groove, 61 first releasing member, 61 fifth releasing member, 6101 first connecting hole, 61011 first sloping wall, 61012 first limiting portion, 6102 evading hole, 611 first elongated hole, 611a eighth elongated hole, 612 first stopping boss, 612a second stopping boss, 613 first push block, 613a fifth push block, 615 extended plate, 616a locking protrusion, 62 locking pin, 620 first annular flange, 6201 first cylinder, 6202 second cylinder, 621 first part, 622 second part, 6222 elastic ami, 63 first elastic element, 635 seventh positioning mechanism, 6351 rib plate, 6352 clamping place, 6353 rib plate, 6354 clamping place, 63a fifth elastic element, 64 mounting column, 6401 second connecting hole, 64011 second sloping wall, 64012 second limiting portion;

7 second limiting structure, 71 bolt, 711 tail end, 712 head, 72 nut, 720 second positioning recess;

8 second swing locking mechanism, 81 second releasing member, 811 second elongated hole, 812 second push block, 82 first linking member, 821 first connecting pin, 822 third elongated hole, 83 engaging member, 830 center hole, 831 connecting lug, 8311 second connecting pin, 832 engaging boss, 833 evading portion;

9 locking device, 901 first end, 9011 first pushing bevel, 902 first end, 9021 second pushing bevel, 91 first blocking member, 911 first connecting boss, 9111 fifth elongated hole, 9112 first recess, 9113 first positioning column, 9115 third receiving groove, 92 second blocking member, 921 second connecting boss, 9211 sixth elongated hole, 9212 second recess, 9213 second receiving groove, 9215 second positioning column, 93 elastic element, 931 first spring, 932 second spring, 94 connecting bracket, 940 mounting hole, 941 first surface, 942 second surface, 945 fastener, 95 third releasing member, 950 threaded hole, 951 first receiving groove, 952 pressing recess, 96 second linking member, 961 first protruding column, 962 second protruding column, 963 pivot, 97 first wedge, 98 second wedge.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0322] First Embodiment

[0323] FIG. 1 to FIG. 13 illustratively show the baby carrier according to the first embodiment of the present disclosure. In the first embodiment, the baby carrier is described by taking a baby dining chair as an example, but the type of baby carrier is not limited to the baby dining chair. For example, in some embodiments, the baby carrier is, for example, a stroller or any other suitable product. Referring to FIG. 1 to FIG. 4, the baby carrier includes a main frame 1, a swing bracket assembly 2, and a seat 3. The main frame 1 is supported by the ground. The swing bracket assembly 2 is connected to the main frame 1 and configured to swing backwards and forwards relative to the main frame 1. The seat 3 is pivotally connected to the main frame 1 through the swing bracket assembly 2, so that the seat can swing backwards and forwards relative to the main frame 1.

[0324] It should be understood that the main frame 1 may have different forms, which depend on the types of the baby carriers. For example, when the baby carrier is the baby dining chair, the main frame 1 is a high chair frame, and when the baby carrier is the stroller, the main frame 1 is a movable frame with rollers arranged at the bottom. Referring to FIG. 1 to FIG. 4, in the first embodiment, the main frame 1 is the high chair frame, which includes two front foot supports 101 arranged at intervals in the left and right directions, and two rear foot supports 102 arranged at intervals in the left and right directions. Lower ends of the two front foot supports 101 are connected by a front cross bar 1031, and lower ends of the two rear foot supports 102 are connected by a rear cross bar 1032. An upper end of the front foot support 101 and an upper end of the rear foot support 102, which are located at the same side, are connected through a folding member 104, and the folding member 104 may control the front foot support 101 and the rear foot support 102 to be folded or to be unfolded. The structure of the main frame 1 is not limited to such a structure. For example, in some embodiments, the front foot support 101 and the rear foot support 102 are fixedly connected to each other and have no folded states.

[0325] A support pipe 11 is arranged on an upper part of a corresponding front foot support 101, and the support pipe 11 is configured to be connected to the swing bracket assembly 2. Referring to FIG. 1 and FIG. 4, in the first embodiment, the support pipe 11 extends upwards relative to the upper end of the front foot support 101, and an extension direction of the support pipe 11 is the same as the extension direction of the front foot support 101. In some embodiments, the support pipe 11 and the front foot support 101 are an integral structure, or the support pipe 11 is sleeved in a tubular part of the front foot support 101. When the support pipe 11 is sleeved in the tubular part of the front foot support 101, the support pipe 11, for example, may be extendable and retractable relative to the front foot support 101, and a height adjustment structure is also arranged between the support pipe 11 and the front foot support 101 and configured to lock a position of the extendable and retractable support pipe 11 relative to the front foot support 101, so that a user can adjust the height of the seat 3 supported by the swing bracket assembly 2 as needed. For the height adjustment structure, reference may be made to related technologies. The height adjustment structure is not the focus of the present invention and will not be described repeatedly hereinafter. It should be noted that, although the support pipe 11 in the first embodiment is installed on the upper end of the corresponding front foot support 101, in some embodiments, the support pipe 11 is not limited to being connected to the front foot support 101. According to the modification of the structure of the main frame 1, the structure of the support pipe 11 and the position of the support pipe 11 in the main frame 1 can be changed accordingly, as long as the support pipe 11 can be pivotally connected to the swing bracket assembly 2 to achieve the corresponding function.

[0326] It should be noted that, unless otherwise clearly described and limited, orientation terms, such as "front", "rear", "left" and "right" in the embodiments of the present disclosure refer to the "front", "rear", "left" and "right" of a baby seated in the baby carrier, respectively. The arrows H and P shown in the drawings denote "front" and "rear" directions, respectively, and the arrows L and R denote "Left" and "Right" directions, respectively. These orientation terms are only used to make the description of the embodiments of the present disclosure clearer, but not used to improperly limit the protection scope of the present invention.

[0327] FIG. 7 shows an exemplary structure of the swing bracket assembly 2. The swing bracket assembly 2, for example, is made of a metal rod, and includes a support frame 22, and swing arms 21 disposed on the left and right sides of the support frame 22, respectively. The support frame 22 has a bent structure. The support frame 22 includes, for example, a first support rod 221, a second support rod 222, a first cross bar 223, a second cross bar 224 and a third cross bar 225. The first support rod 221 and the second support rod 222 are arranged to be opposite to each other. In some embodiments, the first support rod 221 and the second support rod 222 are arranged at intervals at the left and right sides, and both extend in the front and rear directions and are parallel to each other. The first cross bar 223 is connected between a rear end of the first support rod 221 and a rear end of the second support rod 222. The second cross bar 224 is connected to a front end of the first support rod 221 and the swing arm 21 at the right side. The third cross bar 225 is connected to a front end of the second support rod 222 and the swing arm 21 at the left side. The upper end of each of the swing arms 21 is pivotally connected to the support pipe 11 at the corresponding side, so that the swing arms 21 can swing backwards and forwards. In some embodiments, the swing bracket assembly 2 may also have various structures, as long as it includes the swing arms 21 connected to the support pipes 11 arranged at the two sides respectively and can support the seat 3.

[0328] Referring to FIG. 1, the seat 3 is supported by the support frame 22 and restricted by the two swing arms 21 in the left and right directions. When the swing arms 21 swing backwards and forwards, the seat 3 swings along with swing arms 21, so that the baby carrier has a swing mode (also called a rocking chair mode).

[0329] Referring to FIG. 1, FIG. 3, FIG. 23 and FIG. 24, an exemplary structure of the seat 3 is shown in the first embodiment. The seat 3 includes a base 305, two safety fences 306, a back 307, and a dinner plate 308 or a front armrest. The two safety fences 306 are located on the left and right sides of the base 305, the back 307 is installed on the base 305 and located between the two safety fences 306, and the dinner plate 308 or the front armrest is installed on the two safety fences 306 and located in front of the back 307. In some embodiments, the bottom of the back 307 is further provided with a seat portion 3071. For example, the seat portion 3071 and the back 307 are integrally formed and fixed on the base 305, thereby fixing the back 307 on the base 305. A foot shelf 309 is arranged on the front of the base 305 and extends downward, and the foot shelf 309 is configured to support shanks and feet of a baby. An upper end of the foot shelf 309, for example, is pivotally connected to the seat portion 3071 through the pivot 3091, so that after the back 307, the seat portion 3071 and the foot shelf 309 are removed from the base 305, the foot shelf 309 may turn towards the bottom of the seat portion 3071, thereby saving space. The structure of the seat 3 is not limited to the above examples. For example, in some embodiments, the back 307 and the base 305 are integrally formed. Alternatively, the back 307 may be pivotally connected to the base 305. The seat 3 may also be provided with a back adjusting and locking structure, so as to realize a function that a tilt angle of the back 307 is adjustable. Alternatively, the foot shelf 309 may be directly connected to the base 305. Alternatively, in some embodiments, no foot shelf 309 is arranged on the seat 3.

[0330] Referring to FIG. 3 and FIG. 23, the seat 3 includes a mounting structure engaging with the swing bracket assembly 2 above. Specifically, as shown in FIG. 23, a first positioning groove 31 and a second positioning groove 32 are disposed on the bottom surface of the base 305, and the first support rod 221 and the second support rod 222 may be locked into the first positioning groove 31 and the second positioning groove 32, respectively. The positioning groove 331, the positioning groove 332 and the positioning groove 333 are disposed on the bottom surface of the base 305. A first cross bar 223, a second cross bar 224 and a third cross bar 225 may be locked into the positioning groove 331, the positioning groove 332 and the positioning groove 333, respectively. As shown in FIG. 3, outer surfaces of the two safety fences 306 each are provided with a positioning groove 3060. The two swing arms 21 may be clamped into the positioning grooves 3060 on the respective sides of the safety fence 306. Thus, the swing bracket assembly 2 forms a reliable support for the seat 3 in the front and rear directions and in the left and right directions. In addition, a quick releasing structure is arranged between the base 305 and the support frame 22 to easily lock or unlock a connection between the support frame 22 and the base 305. The quick releasing structure is, for example, a locking device 9 to be described in the third embodiment and in the fourth embodiment hereinafter, but the implementation of the quick releasing structure is not limited to the examples below. It can be understood that the structure connecting the seat 3 and the swing bracket assembly 2 may be implemented in various ways, as long as the swing bracket assembly 2 can reliably support the seat 3.

[0331] Referring to FIG. 6, FIG. 7, FIG. 9, FIG. 11 to FIG. 13, a swing limiting mechanism 4 is arranged between the swing arm 21 and the support pipe 11 which are disposed on the same side, and the swing limiting mechanism 4 is configured to limit a swing angle of the swing arm 21, thereby controlling a swing range of the seat 3, so as to achieve the riding safety and comfort of the seat 3 in the swing mode. In some embodiments, the swing angle of the swing arm 21 is within 30 degrees to

40 degrees. Taking the swing angle of 40 degrees of the swing arm 21 as an example, the swing angle of 40 degrees means that the maximum angle a that the swing arm 21 swings backwards from its starting position is 20 degrees (shown in FIG. 11), and the maximum angle P that the swing arm 21 swings forwards from its starting position is 20 degrees (shown in FIG. 12). As shown in FIG. 13, the starting position of the swing arm 21 is, for example, a position at which the swing arm 21 is substantially parallel to the center line of the support pipe 11.

[0332] FIG. 6, FIG. 7, FIG. 9 to FIG. 13 show exemplary structures of the swing limiting mechanism 4 between the swing arm 21 and the support pipe 11 on the left side. In the first embodiment, the structure of the main frame 1 and the structure of the support frame 22 of the baby carrier each are substantially bilateral symmetrical. The swing limiting mechanism 4 between the swing arm 21 and the support pipe 11 at the right side is symmetrical to the swing limiting mechanism 4 at the left side, and will not be described repeatedly hereinafter. In some embodiments, the structure of the main frame 1 and the structure of the support frame 22 of the baby carrier each may not be exactly bilateral symmetrical, and in this case, the swing limiting mechanism 4 may be arranged only between the swing arm 21 and the support pipe 11 disposed on one side.

[0333] Referring to FIG. 6, FIG. 7 and FIG. 9, the support pipe 11 of the main frame 1 includes a first through hole 110 transversely penetrating through the wall of the support pipe 11, and the first through hole 110 is adjacent to the upper end of the support pipe 1. The swing limiting mechanism 4 includes a fixing member 41, and the fixing member 41 is sleeved inside the support pipe 11, so as to be fixed on the main frame 1. For example, as shown in FIG. 6, the upper end of the fixing member

41 has a limiting flange 4109, and the limiting flange 4109 is stuck at the upper opening of the support pipe 11 to fix the fixing member 41 on the upper end of the support pipe 11. The fixing member 41 includes a second through hole 410 and a limiting groove 411. Where, the second through hole 410 is aligned with the first through hole 110, and the limiting groove 411 extends longitudinally along the fixing member 41 and is in communication with the second through hole 410. It can be understood that, in some embodiments, the fixing member 41 is fixed on the main frame 1 in other ways.

[0334] The pivot 211 is disposed on the upper end of the swing arm 21, and connected to the swing arm 21 in a non-rotatable manner. The pivot 211 is configured to pass through the first through hole 110 and the second through hole 410, and an axis of the pivot 211 is substantially perpendicular to the extending direction of the limiting groove 411. When a swing force is exerted on the swing arm 21 , the swing arm 21 , together with the pivot 211, swings around the axis of the pivot 211. In the first embodiment, the swing arm 21 and the pivot 211 are integrally formed. In some embodiments, the pivot 211 and the swing arm 21 are integrally formed, for example, by welding. Alternatively, the pivot 211 and the swing arm 21 are separate structures, and are connected to each other, for example, by means of a flat-head connecting portion engaging with a flat hole.

[0335] Referring to FIG. 11 to FIG. 13, side walls of the limiting groove 411 includes a first side wall 401 and a second side wall 402 parallel to each other, and the first side wall 401 and the second side wall 402 are located at front and rear sides of the pivot 211, respectively. The first side wall 401 and the second side wall 402 each form a first limiting surface 4111 and a second limiting surface 4112. The first limiting surface 4111 on the first side wall 401 is located above the second limiting surface 4112 thereon, and the first limiting surface 4111 on the second side wall 402 is located below the second limiting surface 4112 thereon.

[0336] Referring to FIG. 6, and FIG. 10 to FIG. 13, the swing limiting mechanism 4 further includes an abutting member 42. The abutting member 42 is connected to the pivot 211 in a non-rotatable manner and is disposed between the first limiting surfaces 4111 of the first side wall 401 and second side wall 402, and between the second limiting surfaces 4112 of the first side wall 401 and second side wall 402. The abutting member 42 limits the swing angle of the swing arm 21 by abutting against the first limiting surface 4111 and the second limiting surface 4112. In the first embodiment, the abutting member 42 and the pivot 211 are separate structures. The abutting member 42 is inserted into the limiting groove 411 first, and then is connected to the pivot 211 in the non-rotatable manner. The abutting member 42 is substantially rhombus-shaped, and includes a first parallel surfaces pair 421 and a second parallel surfaces pair 422. Referring to FIG. 11, when swinging to abut against the first limiting surfaces 4111, the first parallel surfaces pair 421 prevents the swing arm 21 from continuing to swing in a first direction Tl. Referring to FIG. 12, when swinging to abut against the second limiting surfaces 4112, the second parallel surfaces pair 422 prevents the swing arm 21 from continuing to swing in a second direction T2. The first direction Tl is opposite to the second direction T2. In the first embodiment, the first direction Tl is, more specifically, a backward direction, and the second direction T2 is, more specifically, a forward direction.

[0337] It should be noted that in the first embodiment, although the first side wall 401 and the second side wall 402 are parallel to each other, and the abutting member 42 is substantially rhombus-shaped, in other embodiments, the first side wall 401, the second side wall 402 and the abutting member 42 may also have other implementations and are not limited to the above examples, as long as the first side wall 401 and the second side wall 402 can engage with the abutting member 42 to restrict the swing angle of the swing arm 21 within a preset angle.

[0338] FIG. 6, FIG. 7 and FIG. 10 show an exemplary connection between the pivot 211 and the abutting member 42. An end of the pivot 211 includes a first flat-head portion 2111, and the abutting member 42 includes a first flat hole 423 for engaging with the first flat-head portion 2111. A portion of the first flat-head portion 2111, which is located in the limiting groove 411, is configured to pass through the first flat hole 423, so that the abutting member 42 is connected to the pivot 211 in the non-rotatable manner. In some embodiments, the first flat-head portion 2111 and the first flat hole 423 have sectional shapes such as rectangles, trapezoids, ellipses, and rectangle-like shapes. Referring to FIG. 6 and FIG. 7, during an installation, the abutting member 42 is first inserted into the limiting groove 411 from a groove opening 41101 on the top of the limiting groove 411, and then the first flathead portion 2111 passes through the first through hole 110 at one side of the limiting groove 411 and the second through hole 410, and after the first flat hole 423 of the abutting member 42 is aligned with the first flat-head portion 2111, the first flat-head portion 2111 passes through the first flat hole 423. As can be seen from FIG. 13, in some embodiments, the limiting groove 411 has a closed groove bottom 41102, which can prevent the abutting member 42 from accidentally sliding into the support pipe 11 from the bottom of the limiting groove 411.

[0339] Referring to FIG. 6, FIG. 7 and FIG. 10, a diameter of the pivot 211 is less than diameters of the first through hole 110 and the second through hole 410. A first shaft sleeve 201 fits over an outer periphery of the pivot 211. The first shaft sleeve 201 is disposed on one side of the limiting groove 411 and is at least sleeved in the second through hole 410 of the fixing member 41. The pivot 211 is supported by the first shaft sleeve 201 and is rotatable relative to the first shaft sleeve 201. The first shaft sleeve 201 is made of a wear-resistant material with a small friction coefficient, for example, plastic material, so as to reduce a resistance during a swing of the swing arm 21. In some embodiments, no first shaft sleeve 201 is provided, and the pivot 211 is directly supported, for example, by the second through hole 410.

[0340] Referring to FIG. 6, a step 4108 is formed on a hole wall of the second through hole 410, and the step 4108 is configured to limit an installation depth of the first shaft sleeve 201 in the second through hole 410, and prevent the first shaft sleeve 201 from abutting against the abutting member 42. In some embodiments, the first shaft sleeve 201 closely engages with the second through hole 410, to avoid an axial movement or a circumferential rotation of the first shaft sleeve 201 relative to the second through hole 410. Referring to FIG. 7 and FIG. 10, in some embodiments, axial guiding grooves 2011 are formed on an outer periphery of the first shaft sleeve 201, and axial guiding ribs 4101 are arranged on the hole wall of the second through hole 410. Extension directions of the axial guiding grooves 2011 and the axial guiding ribs 4101 are parallel to the axis of the pivot 211. During an installation, the axial guiding grooves 2011 and the axial guiding ribs 4101 move relative to each other in the axial direction and engage with each other, so as to avoid the circumferential rotation of the first shaft sleeve 201 relative to the second through hole 410. It can be understood that in some embodiments, the position of the axial guiding groove 2011 on the outer periphery of the first shaft sleeve 201 and the position of the axial guiding rib 4101 on the hole wall of the second through hole 410 may be interchanged.

[0341] Referring to FIG. 6, FIG. 7, FIG. 9 and FIG. 10, a first step 2102 is formed at a root of the first flat-head portion 2111, and from one side, the first step 2102 may prevent an axial movement of the abutting member 42 relative to the pivot 211. A first limiting structure 5 is arranged on the first flat-head portion 2111, and from another side, the first limiting structure 5 prevents the axial movement of the abutting member 42 relative to the pivot 211, thus preventing the abutting member 42 from moving along the first flat-head portion 2111 and from being detached from the first flathead portion 2111.

[0342] Referring to FIG. 6, FIG. 7, FIG. 9 and FIG. 10, an exemplary structure of the first limiting structure 5 is also shown in the first embodiment. The first limiting structure 5 includes a spring clip 51 and a first positioning sleeve 52, which are located on the other side of the limiting groove 411. The first positioning sleeve 52 fits over the first flat-head portion 2111 and is located in the second through hole 410. A second flat hole 521 is formed along the axis direction and located in the center of the first positioning sleeve 52. The second flat hole 521 is configured to engage with the first flathead portion 2111, thus avoiding a rotation between the first positioning sleeve 52 and the first flathead portion 2111. The first positioning sleeve 52 also includes a radial through groove 522. The radial through groove 522 is configured to receive the spring clip 51 and intersects with the second flat hole 521 perpendicularly. A first positioning recess 2101 is formed on the first flat-head portion 2111. The spring clip 51 is configured to be inserted into the radial through groove 522, and engages with the first positioning recess 2101, so that an axial position, on the first flat-head portion 2111, of the first positioning sleeve 52 is fixed, and that the abutting member 42 is clamped between the first step 2102 and the first positioning sleeve 52. Referring to FIG. 6, in some embodiments, an outer peripheral wall of the first positioning sleeve 52 is in contact with the hole wall of the second through hole 410, thus the first positioning sleeve 52 may form an auxiliary support for the first flat-head portion 2111.

[0343] Referring to FIG. 7, in some embodiments, one or more positioning holes 424 are formed on an end surface, facing the first positioning sleeve 52, of the abutting member 42. The positioning holes 424 may be blind holes or through holes. One or more positioning columns 523 are disposed on an end surface, facing the abutting member 42, of the first positioning sleeve 52. The positioning hole 424 engages with the positioning column 523. Since the first positioning sleeve 52 and the first flat-head portion 2111 are connected in the non-rotatable manner, the non-rotatable connection between the abutting member 42 and the first flat-head portion 2111 is further guaranteed by means of the positioning hole 424 engaging with the positioning column 523. In some embodiments, the position of the positioning hole 424 on the abutting member 42 and the position of the positioning column 523 on the first positioning sleeve 52 may be interchanged.

[0344] Referring to FIG. 7, the baby carrier may also be provided with the first swing locking mechanism 6. The first swing locking mechanism 6 is configured to lock the swing of the swing arm 21, so that the seat 3 cannot swing, that is, the seat 3 is switched from the swing mode to the fixed mode. For the baby dining chair, the seat 3 needs to be switched from the swing mode to the fixed mode when a baby is having a dinner. The first swing locking mechanism 6 may be implemented in various ways. Referring to FIG. 3, at least one locking hole 30 is formed on a side portion of the seat 3, more specifically, formed on a safety fence 306 of the seat 3. Referring to FIG. 5, the first swing locking mechanism 6 is installed on the main frame 1 and includes a locking pin 62 which is axially retractable, and the locking pin 62 is parallel to the pivot 211. When the locking pin 62 is controlled to be inserted into the locking hole 30, the swing of the swing arm 21 is locked, and the seat 3 is switched to the fixed mode. It should be understood that, when a plurality of locking holes 30 are formed on the seat 3, a degree of inclination of the seat 3 in the fixed mode may be changed by means of inserting the locking pin 62 into different locking holes 30. When the seat 3 needs to be switched to the swing mode, the locking pin 62 is controlled to retract from the corresponding locking hole 30, and the locking pin 62 will no longer interfere in the swing of the swing arm 21, and the swing arm 21 may drive the seat 3 to swing within the angle range limited by the swing limiting mechanism 4.

[0345] Referring to FIG. 5, FIG. 7 to FIG. 9, and FIG. 11 to FIG. 13, an exemplary structure of the first swing locking mechanism 6, and an exemplary installation structure for the first swing locking mechanism 6 and the main frame 1 are shown in the first embodiment. For the convenience of installing the first swing locking mechanism 6, the main frame 1 further includes a first mounting housing 15, and the first swing locking mechanism 6 is installed inside the first mounting housing 15. The first mounting housing 15 is installed on the main frame 1, more specifically, the first mounting housing 15 is mounted on the support pipe 11 .

[0346] Referring to FIG. 7 and FIG. 9, the first mounting housing 15 is formed by butting a first housing portion 151 and a second housing portion 152 together, and the first swing locking mechanism 6 is installed inside the first mounting housing 15.

[0347] The second housing portion 152 is farther away from a longitudinal center plane (or called a center plane of a left-right symmetry) of the baby carrier than the first housing portion 151. The second housing portion 152 includes a first sleeve portion 150, and the first sleeve portion 150 fits over an end of the support pipe 11. In some embodiments, as shown in FIG. 9, the support pipe 11 includes a hole 1101, and the first sleeve portion 150 includes a hole 1501, and a fastener, such as a screw, is configured to pass through the hole 1501 and the hole 1101 successively to fix the second housing portion 152 on the support pipe 11. Referring to FIG. 7, an operating button 154 is disposed on the second housing portion 152. A first end of the operating button 154 is hinged with the second housing portion 152 through a pin shaft 15 1, and a second end of the operating button 154 includes a mounting hole 1542. The mounting hole 1542 is configured to be connect to an end of a cable (not shown in the figures). A restoring spring 153 is further arranged between the operating button 154 and the second housing portion 152. Under an action of a force, the operating button 154 moves upwards around the pin shaft 1541 and compresses the restoring spring 153, the second end of the operating button 154 drives the cable to move upwards, and the upward movement of the cable may realize a corresponding function. For example, in some embodiments, the upward movement of the cable may release a locking relationship between the support pipe 11 and the front foot support 101, so that the support pipe 11 may extend and retract relative to the front foot support 101 to adjust the height of the seat 3. Since the technical features and functions related to the operating button 154 and the cable are not the focus of the present invention, the operating button 154 and the cable will not be described repeatedly hereinafter.

[0348] The first housing portion 151 is fixed on the second housing portion 152 by a screw (not shown in the figures). The first housing portion 151 includes a third through hole 1503, and the locking pin 62 is configured to stretch out from the third through hole 1503. Referring to FIG. 7 and FIG. 9, the first swing locking mechanism 6 further includes a first releasing member 61 and a first elastic element 63. Referring to FIG. 5, the first elastic element 63 is located inside the first mounting housing 15 and arranged to exert an elastic force on the locking pin 62, forcing the locking pin 62 to stretch outwards and to be inserted into the corresponding locking hole 30. The first releasing member 61 is operatively connected to the locking pin 62 to force the locking pin 62 to retract, so that the locking pin 62 retract from the corresponding locking hole 30.

[0349] In some embodiments, the first releasing member 61 may move backwards and forwards relative to the first mounting housing 15 to enter a locking position or an unlocking position. The first housing portion 151 and/or the second housing portion 152 is provided with a structure 1521 for guiding the first releasing member 61 to move. Referring to FIG. 8, FIG. 11 and FIG. 12, when the first releasing member 61 is at the unlocking position, the first releasing member 61 drives the locking pin 62 to retract from the locking hole 30, and the swing arm 21 may swing backwards and forwards. Referring to FIG. 8 and FIG. 13, when the first releasing member 61 is at the locking position, the first elastic element 63 drives the locking pin 62 to stretch outwards to be inserted into the locking hole 30.

[0350] Referring to FIG. 7, FIG. 8, FIG. 11 to FIG. 13, in some embodiments, a first annular flange 620 is arranged on the middle part of the locking pin 62, and the first annular flange 620 divides the locking pin 62 into a first part 621 and a second part 622. The first part 621 is configured to stretch outwards to be inserted into the locking hole 30, and the first elastic element 63 fits over the second part 622. The second housing portion 152 includes a mounting hole 1520, and the second part 622 is axially movable and arranged in the mounting hole 1520. Referring to FIG. 8, the first releasing member 61 includes a first elongated hole 611, and the first elongated hole 611 is a straight hole or a curved hole. An obliquely-extending first stopping boss 612 is formed by the hole wall of the first elongated hole 611. The first annular flange 620 is clamped between the first stopping boss 612 and the first elastic element 63. When the first releasing member 61 moves to the unlocking position, the first stopping boss 612 pushes the first annular flange 620 to drive the locking pin 62 to move axially, so that the locking pin 62 retracts till it exits from the locking hole 30. When the first releasing member 61 moves to the locking position, the first stopping boss 612 evades to provide an axial space, the first elastic element 63 drives the locking pin 62 to stretch outwards, and the locking pin 62 is inserted into the locking hole 30. The structure of the first releasing member 61 that controls the locking pin 62 to stretch and retract axially is various and is not limited to the examples above.

[0351] Referring to FIG. 8, FIG. 11 to FIG. 13, in order to make the operation of the first releasing member 61 easily, the first releasing member 61 further includes a first push block 613 protruding relative to the first mounting housing 15. The first push block 613 makes it convenient to change front and rear positions of the first releasing member 61 manually. The first mounting housing 15 correspondingly includes a first opening 1505 allowing the first push block 613 to move through, and the first opening 1505 may also limit a travel of the first push block 613.

[0352] As shown in FIG. 11 to FIG. 13, in some embodiments, the upper end of the support pipe 11 extends into the first mounting housing 15 through the first sleeve portion 150 of the first mounting housing 15, and the fixing member 41 disposed at the upper end of the support pipe 11 is also received inside the first mounting housing 15 accordingly. The first mounting housing 15 includes a second opening 1506 (shown in FIG. 9) allowing the swing arm 21 to pass through, and the second opening 1506 also assists in limiting the swing angle of the swing arm 21.

[0353] This embodiment also provides a swing mechanism. The swing mechanism includes the fixing member 41, the swing arm 21 and the abutting member 42 described above. As described in this embodiment, the fixing member 41 includes the first limiting surface 4111 and the second limiting surface 4112. The swing arm 21 includes the pivot 211 which is pivotable relative to the fixing member 41. The abutting member 42 is connected to the pivot 211 and located between the first limiting surface 4111 and the second limiting surface 4112. When the swing arm 21 turns, the abutting member 42 turns together with the swing arm 21, and when reaching the boundary position of the swing, the abutting member 42 abuts against the first limiting surface 4111 and the second limiting surface 4112 respectively, thereby restricting the swing angle of the swing arm 21.

[0354] In some embodiments, as described above, the fixing member 41 includes the limiting groove 411, and the extending direction of the limiting groove 411 is perpendicular to the axial direction of the pivot 211. The first limiting surface 4111 and the second limiting surface 4112 are formed on the first side wall 401 and the second side wall 402 of the limiting groove 411, which are parallel to each other. The abutting member 42 is attached to the swing arm 21 and includes the first parallel surfaces pair 421 and the second parallel surfaces pair 422. The abutting member 42 restricts the range of the swing angle of the swing arm 21 by mean of the first parallel surfaces pair 421 and the second parallel surfaces pair 422 abutting against different positions of the first side wall 401 and the second side wall 402.

[0355] The swing mechanism may be applied to any suitable product to limit the range of the swing angle of the swing ami 21.

[0356] Second Embodiment

[0357] FIG. 14 to FIG. 21 illustratively show part of the structures of the baby carrier according to the second embodiment of the present disclosure. Similar to the first embodiment above, the baby carrier in the second embodiment is also described by taking the baby dining chair as an example. The type of the baby carrier is not limited to the baby dining chair. The baby carrier includes the main frame 1, the swing bracket assembly 2 and the seat. It should be noted that the structure of the seat is not shown in FIG. 14 to FIG. 21. If no conflict occurs, for the seat, reference may be made to the description of the structure of the seat 3 in the first embodiment described above. [0358] Referring to FIG. 14, the structure of the main frame 1 in the second embodiment is similar to the structure of the main frame 1 in the first embodiment above. The main frame 1 includes two front foot supports 101, two rear foot supports 102, the front cross bar (not shown) connected between the two front foot supports 101, the rear cross bar (not shown) connected between the two rear foot supports 102, the folding member 104 connected between the front foot support 101 and the rear foot support 102 which are located at the same side, and the support pipes 11 arranged on the upper parts of the front foot supports respectively. For the interrelationships of these components, reference may be made to the description in the first embodiment described above, which will not be repeated hereinafter.

[0359] Referring to FIG. 16, the structure of the swing bracket assembly 2 in the second embodiment is similar to the structure of the swing bracket assembly 2 in the first embodiment above. The swing bracket assembly 2 includes the support frame 22, and the swing arms 21 disposed on the left and right sides of the support frame 22, respectively. The support frame 22 may have the bent structure, and includes, for example the first support rod 221, the second support rod 222, the first cross bar 223, the second cross bar 224 and the third cross bar 225. For the interrelationships between these components and the engagement relationship between the swing bracket assembly 2 and the seat 3, reference may be made to the description in the first embodiment described above, which will not be repeated herein. Each upper end of the swing arm 21 is pivotally connected to the corresponding support pipe 11, so that the swing bracket assembly 2 may swing backwards and forwards to drive the seat 3 to swing backwards and forwards.

[0360] Referring to FIG. 15 to FIG. 17, and FIG. 20 and FIG. 21, in the baby carrier of the second embodiment, the swing limiting mechanism 4 is arranged between the swing arm 21 and the support pipe 11 which are disposed at the same side, and has the same function as the swing limiting mechanism 4 in the first embodiment above, which is configured to limit the swing angle of the swing arm 21, thereby controlling the swing range of the seat 3, and achieving the riding safety and comfort of the seat 3 in the swing mode. For example, the swing limiting mechanism 4 limits the swing angle of the swing arm 21 within 30 degrees to 40 degrees. An exemplary structure of the swing limiting mechanism 4, arranged between the swing arm 21 and the support pipe 11 at the left side, is shown in the second embodiment. In the second embodiment, the main frame 1 of the baby carrier and the structure of the support frame 22 are substantially left-right symmetrical. The swing limiting mechanism 4 between the swing arm 21 and the support pipe 11 at the right side is symmetrical to the swing limiting mechanism 4 at the left side, and will not be described repeatedly hereinafter. In some embodiments, the structure of the main frame 1 and the structure of the support frame 22 of the baby carrier each may not be exactly bilateral symmetrical, and in this case, the swing limiting mechanism 4 may be arranged only between the swing arm 21 and the support pipe 11 disposed on one side.

[0361] Referring to FIG. 15 to FIG. 17, the support pipe 11 of the main frame 1 includes a first through hole 110 transversely penetrating through the wall of the support pipe 11, and the first through hole 110 is adjacent to the upper end of the support pipe 1. The swing limiting mechanism 4 includes a fixing member 41, and the fixing member 41 is sleeved inside the support pipe 11, so as to be fixed on the main frame 1. For example, the upper end of the fixing member 41 is provided with a limiting flange 4109, and the limiting flange 4109 is stuck at the upper opening of the support pipe 11 to fix the fixing member 41 on the upper end of the support pipe 11. The fixing member 41 includes a second through hole 410 and a limiting groove 411. Where, the second through hole 410 is aligned with the first through hole 110, and the limiting groove 411 extends longitudinally along the fixing member 41 and is in communication with the second through hole 410. It should be understood that, in some embodiments, the fixing member 41 may be fixed on the main frame 1 in other ways.

[0362] Referring to FIG. 16 and FIG. 17, the pivot 211 is disposed on the upper end of the swing arm 21, and the pivot 211 is connected to the swing arm 21 in the non-rotatable manner. The pivot 211 is arranged to pass through the first through hole 110 and the second through hole 410, and the axis of the pivot 211 is substantially perpendicular to the extending direction of the limiting groove 411. When a swing force is exerted on the swing arm 21, the swing arm 21, together with the pivot 211, swings around the axis of the pivot 211. In the second embodiment, the pivot 211 and the swing arm 21 are separate structures. A flat-head connecting portion 2113 is arranged on and protrudes from an end surface of the second end of the pivot 211, and a connecting piece 26 is arranged on the upper end of the swing arm 21. The connecting piece 26 includes a third flat hole 260 configured to engage with the flat-head connecting portion 2113. The flat-head connecting portion 2113 and the third flat hole 260 may have sectional shapes such as rectangles, trapezoids, ellipses, and rectangle-like shapes. [0363] Referring to FIG. 16, FIG. 20 and FIG. 21, a limiting member 43 is arranged inside the limiting groove 411. More specifically, the limiting member 43 (e.g. a plate piece) is inserted into the limiting groove 411. The limiting member 43 includes an opening 430 allowing the pivot 211 to pass through, and the first limiting surface 4111 and the second limiting surface 4112 are formed on the wall of the opening 430. More specifically, the opening 430 includes a first hole portion 4301, and the first hole portion 4301 is, for example, a sector-shaped hole portion. The first hole portion 4301 includes a first wall 43011 and a second wall 43012, and the first wall 43011 and the second wall 43012 are located at the front and rear sides of the pivot 211, respectively. The first wall 43011 and the second wall 43012 each form the first limiting surface 4111 and the second limiting surface 4112. [0364] Referring to FIG. 20, in the second embodiment, the first hole portion 4301 is formed by two oppositely arranged upper and lower sector-shaped sub-holes (not marked in the figure) communicating with each other. The first wall 43011 of the first hole portion 4301 includes a front wall of the upper sector-shaped sub-hole and a front wall of the lower sector-shaped sub-hole, and the second wall 43012 of the first hole portion 4301 includes a rear wall of the upper sector-shaped sub-hole and a rear wall of the lower sector-shaped sub-hole. The first limiting surface 4111 includes the front wall of the upper sector-shaped sub-hole and the rear wall of the lower sector-shaped subhole, and the second limiting surface 4112 includes the rear wall of the upper sector-shaped sub-hole and the front wall of the lower sector-shaped sub-hole.

[0365] Referring to FIG. 16, FIG. 20 and FIG. 21, the swing limiting mechanism 4 further includes an abutting member 42. The abutting member 42 is connected to the pivot 211 in the non-rotatable manner and is located between the first limiting surface 4111 and the second limiting surface 4112. The abutting member 42 limits the swing angle of the swing arm 21 by abutting against the first limiting surface 4111 and abutting against the second limiting surface 4112. In the second embodiment, the abutting member 42 and the pivot 211 are formed integrally. More specifically, the abutting member 4 is a second flat-head portion formed on the pivot 211, and the second flat-head portion is adjacent to a first end of the pivot 211 and includes a first plane 425 and a second plane 426 parallel to each other. The first end of the pivot 211 is the end of the pivot 211 away from the connecting piece 26.

[0366] Referring to FIG. 20, during the swing of the swing anu 21, when an upper part of the first plane 425 and a lower part of the second plane 426 abut against the first limiting surfaces 4111 at the same time, the swing arm 21 is stopped from continuing swinging in the first direction Tl, and when a lower part of the first plane 425 and an upper part of the second plane 426 abut against the second limiting surfaces 4112 at the same time, the swing arm 21 is stopped from continuing swinging in the second direction T2.

[0367] It should be noted that although the opening 430 in the second embodiment includes the first hole portion 4301 formed by butting two sector-shaped sub-holes communicating with each other, and the abutting member 42 is the second flat-head portion formed on the pivot 211. In other embodiments, the opening 430 and the abutting member 42 may also have other implementations and are not limited to the above examples, only if the hole wall of the opening 430 may restrict the swing angle of the swing arm 21 within the preset angle. For example, in some embodiments, the first hole portion 4301 of the opening 430 only includes one sector-shaped sub-hole, and the front and rear walls of the sector-shaped sub-hole form the first limiting surface 4111 and the second limiting surface 4112, respectively.

[0368] Referring to FIG. 15 to FIG. 17, the diameter of the pivot 211 is smaller than diameters of the first through hole 110 and the second through hole 410. A second shaft sleeve 202 fits over the outer periphery of the pivot 211. The second shaft sleeve 202 is disposed on one side of the limiting groove 411 and is at least sleeved in the second through hole 410 of the fixing member 41. The pivot 211 is supported by the second shaft sleeve 202 and is rotatable relative to the second shaft sleeve 201. The second shaft sleeve 201 is made of the wear-resistant material with a small friction coefficient, for example, the plastic material, so as to reduce a resistance during the swing of the swing arm 21. In some embodiments, the second shaft sleeve 202 tightly engages with the second through hole 410 to avoid an axial movement and a circumferential rotation of the second shaft sleeve 202 relative to the second through hole 410. In some embodiments, no second shaft sleeve 202 is provided, and the pivot 211 is directly supported, for example, by the second through hole 410.

[0369] Referring to FIG. 15 to FIG. 17, the pivot 211 is provided with a second limiting structure 7. The second limiting structure 7 is configured to prevent the connecting piece 26, the pivot 211 and the limiting member 43 from being separated from each other. An exemplary connection between the pivot 211 and the second limiting structure 7 is shown in the figure. Specifically, the pivot 211 includes a center hole 2110 (shown in FIG. 16), and a second step 2103 (shown in FIG. 17) is formed at the root of the second flat-head portion, and a third step 2105 (shown in FIG. 16) is formed at the root of the flat-head connecting portion 2113. The second limiting structure 7 includes a bolt 71 and a nut 72, a tail end 711 of the bolt 71 is inserted into the center hole 2110 from a second end of the pivot 211 (an end of the flat-head connecting portion 2113), and goes out of the center hole 2110 from a first end of the pivot 211 to be screwed in a nut 72. The nut 72 is disposed on the other side of the limiting groove 411 and located in the second through hole 410. The connecting piece 26 is clamped between the third step 2105 and the head 712 of the bolt 71, the limiting member 43 is clamped between the second step 2103 and the nut 72, and the second shaft sleeve 202 is located between the connecting piece 26 and the limiting member 43.

[0370] Referring to FIG. 15 to FIG. 17, the pivot 211 further includes a prism 2115 protruding from the end surface of the second flat-head portion, and the nut 72 forms a second positioning recess 720 engaging with the prism 2115. The prism 2115 engages with the second positioning recess 720, so that the nut 72 cannot rotate relative to the pivot 211, thus making it convenient to screw the bolt 71 into or out of the nut 72. In some embodiments, an outer peripheral wall of the nut 72 is in contact with the hole wall of the second through hole 410, thus forming an auxiliary support for the pivot 211. [0371] In some embodiments, the baby carrier may be provided with the first swing locking mechanism 6 in the first embodiment above, and the swing of the swing arm 21 is locked by the first swing locking mechanism 6, so that the seat 3 cannot swing and is in the fixed mode.

[0372] This second embodiment provides another implementation for locking the swing of the swing arm 21. Referring to FIG. 20 and FIG. 21, the limiting groove 411 includes a groove opening

41101 and a groove bottom 41102. The limiting member 43 is inserted into the limiting groove 411 through the groove opening 41101, and the limiting member 43 is longitudinally movable in the limiting groove 411 to adjust its own position. The limiting groove 411 has a closed groove bottom

41102 to prevent the limiting member 43 from accidentally slipping into the support pipe 11 through the bottom of the limiting groove 41. The opening 430 of the limiting member 43 further includes the second hole portion 4302 communicating with the first hole portion 4301. The second hole portion 4302 is, for example, a straight hole portion, and the straight hole portion includes, for example, two opposite and parallel hole walls. The second hole portion 4302 is located below the first hole portion

4301 and proximate to the groove bottom 41102, and the first hole portion 4301 is proximate to the groove opening 41101. As shown in FIG. 21, by moving the limiting member 43 towards the groove opening 41101, at least part of the second flat-head portion is inserted into the second hole portion

4302 from the first hole portion 4301, and the first plane 425 and the second plane 426 of the second flat-head portion abut against the hole walls on two sides of the second hole portion 4302, that is, the second flat-head portion engages with the second hole portion 4302, thereby restricting the swing of the swing arm 21. Referring to FIG. 21, in some embodiments, two limiting portions 4307 are formed at the junction of the two sector-shaped sub-holes. By designing a depth of the second hole portion 4302 properly, when the second flat-head portion engages with the second hole portion 4302, part of the second flat-head portion is clamped between the two limiting portions 4307, thus the two limiting portions 4307 also have a limiting effect on the second flat-head portion. Conversely, as shown in FIG. 20, by moving the limiting member 43 towards the groove bottom 41102 till the second flathead portion is completely located in the first hole portion 4301, the swing arm 21 may swing forwards and backwards.

[0373] It should be understood that, in some embodiments, an upper position of the first hole portion 4301 and a lower position of the second hole portion 4302 may be interchanged. In this case, when the limiting member 43 moves toward the groove opening 41101, and when the second flat-head portion is completely located in the first hole portion 4301, the swing arm 21 may swing backwards and forwards. Conversely, when the limiting member 43 moves towards the groove bottom 41102, at least part of the second flat-head portion is inserted into the second hole portion 4302 from the first hole portion 4301, and the swing of the swing arm 21 is locked.

[0374] Referring to FIG. 20 and FIG. 21, in the second embodiment, a second elastic element 45 is arranged in the limiting groove 411 and clamped between the limiting member 43 and the groove bottom 41102, so as to exert an upward force on the limiting member 43 to force the limiting member 43 to move towards the groove opening 41101. In order to have the second elastic element 45 positioned easily, a guiding portion 4115 having a cylindrical shape is formed in the limiting groove 411. In addition, the limiting member 43 includes a receiving recess 4309, and an upper end of the second elastic element 45 is received in the receiving recess 4309. When a pressing force is applied to the limiting member 43, the limiting member 43 overcomes an elastic force of the second elastic element 45 and moves towards the groove bottom 41102. Thus, by forcing the limiting member 43 to move up and down inside the limiting groove 411, the first hole portion 4301 and the second hole portion 4302 selectively engages with the second flat-head portion. As may be known from the above description, when the second flat-head portion engages with the first hole portion 4301, the swing arm 21 may swing backwards and forwards, and when at least part of the second flat-head portion engages with the second hole portion 4302, the swing of the swing arm 21 is locked.

[0375] Referring to FIG. 16 to FIG. 21, in order to exert a pressure, towards the groove bottom 41102, on the limiting member 43, the second embodiment further includes a second swing locking mechanism 8. The second swing locking mechanism 8 is operatively connected to the limiting member 43, so as to exert the pressure, toward the groove bottom 41102, on the limiting member 43, so that the limiting member 43 overcomes the action of the second elastic element 45 and moves toward the groove bottom 41102.

[0376] Referring to FIG. 15 to FIG. 21, an exemplary structure of the second swing locking mechanism 8 and an exemplary installation structure for the second swing locking mechanism 8 and the main frame 1 are shown in the second embodiment. For the convenience of installing the second swing locking mechanism 8, the baby carrier further includes a second mounting housing 16, and the second swing locking mechanism 8 is installed inside the second mounting housing 16. The second mounting housing 16 is installed on the main frame 1, more specifically, the second mounting housing 16 is mounted on the support pipe 11.

[0377] Referring to FIG. 15 and FIG. 16, the second mounting housing 16 is formed by butting a third housing portion 161 and a fourth housing portion 162 together, and the second swing locking mechanism 8 is installed inside the second mounting housing 16.

[0378] The fourth housing portion 152 is farther away from the longitudinal center plane (or called the center plane of a left-right symmetry) of the baby carrier than the third housing portion 161. The fourth housing portion 162 includes a second sleeve portion 160, and the second sleeve portion 160 fits over the end of the support pipe 11. Referring to FIG. 17, in some embodiments, the support pipe 11 includes a hole 1101, and the second sleeve portion 160 includes a hole 1601, and a fastener, such as a screw, is configured to pass through the hole 1601 and the hole 1101 successively to fix the fourth housing portion 162 on the support pipe 11. Referring to FIG. 14 and FIG. 16, an operating button 164 is disposed on the fourth housing portion 162. A first end of the operating button 164 is hinged with the fourth housing portion 162 through the pin shaft 1641, and a second end of the operating button 164 includes a mounting hole 1642. The mounting hole 1642 is configured to be connected to an end of a cable (not shown in the figures). A restoring spring 163 is further arranged between the operating button 164 and the fourth housing portion 162. Under an action of a force, the operating button 164 moves upwards around a pin shaft 1641 and compresses the restoring spring 163, and the second end of the operating button 164 drives the cable to m ove upwards, and the upward movement of the cable may realize a corresponding function. For example, in some embodiments, the upward movement of the cable may release a locking relationship between the support pipe 11 and the front foot support 101, so that the support pipe 11 may extend and retract relative to the front foot support 101 to adjust the height of the seat 3. Since the technical features and functions related to the operating button 164 and the cable are not the focus of the present invention, the operating button 164 and the cable will not be described repeatedly hereinafter.

[0379] The third housing portion 161 may be fixed on the fourth housing portion 162 with a screw (not shown). Referring to FIG. 16, and FIG. 18 to FIG. 21, a clamping part 431 is disposed on the top of the limiting member 43 proximate to the groove opening 41101, and the clamping part 431 is, for example, a concave portion. The second swing locking mechanism 8 includes a second releasing member 81 , a first linking member 82 and an engaging member 83. The engaging member 83 includes a center hole 830. Arotation shaft 169 (shown in FIG. 16) is arranged inside the interior of the second mounting housing 16. The engaging member 83 fits over the rotation shaft 169 through the center hole 830. The rotation shaft 169 is parallel to the pivot 211. A connecting lug 831, an engaging boss 832 and an evading portion 833 are arranged on the outer periphery of the engaging member 83. The first linking member 82 is connected between the connecting lug 831 and the second releasing member 81, and the second releasing member 81 drives the engaging member 83 to rotate through the first linking member 82, so that the engaging boss 832 and the evading portion 833 rotate accordingly. Referring to FIG. 20, when the engaging boss 832 rotates to a position where the engaging boss 832 abuts against the clamping part 431, the limiting member 43 moves towards the groove bottom 41102, and the second flat-head portion engages with the first hole portion 4301, so that the swing arm 21 can swing backwards and forwards. Referring to FIG. 21, when the evading portion 833 rotates to a position where the evading portion 833 abuts against the top of the limiting member 43, the limiting member 43, under the action of the second elastic element 45, moves towards the groove opening 41101, and the second flat-head portion engages with the second hole portion 4302, so that the swing of the swing arm 21 is locked.

[0380] In the second embodiment, the second releasing member 81 moves backwards and forwards relative to the second mounting housing 16 to a locking position or an unlocking position, and the third housing portion 161 and/or the fourth housing portion 162 is provided with a structure 1621 guiding the second releasing member 81 to move. Referring to FIG. 18 and FIG. 20, when the second releasing member 81 moves backwards to the unlocking position, the first linking member 82 drives the engaging member 83 to pivot, so that the engaging boss 832 and the clamping part 431 abuts against each other, and the limiting member 43 moves downwards, then the second flat-head portion engages with the first hole portion 4301, thus the swing arm 21 may swing backwards and forwards. Referring to FIG. 19 and FIG. 21, when the second releasing member 81 moves forwards to the locking position, the engaging boss 832 is detached from the clamping part 431, and the evading portion 833 faces the limiting member 43 and allows the limiting member 43 to move upwards, so that the second flat-head portion engages with the second hole portion 4302, and the swing of the swing arm 21 is locked.

[0381] Referring to FIG. 16 and FIG. 17, the second embodiment shows an exemplary connection between the first linking member 82, the second releasing member 81 and the engaging member 83. More specifically, the first linking member 82 has a curved shape, a first connecting pin 821 is arranged at a first end of the first linking member 82, and the second releasing member 81 includes a second elongated hole 811, with which the first connecting pin 821 slidably engages. In some embodiments, the position of the first connecting pin 821 on the first linking member 82 and the position of the second elongated hole 811 on the second releasing member 81 may be interchanged. A third elongated hole 822 is disposed at a second end of the first linking member 82, and the connecting lug 831 is provided with a second connecting pin 8311. The second connecting pin 8311 slidably engages with the third elongated hole 822. In some embodiments, the position of the second connecting pin 8311 on the connecting lug 831 and the position of the third elongated hole 822 in the first linking member 82 may be interchanged.

[0382] Referring to FIG. 18 and FIG. 19, in order to operate the second releasing member 81 easily, the second releasing member 81 includes a second push block 812 protruding relative to the second mounting housing 16, and the second push block 812 makes it convenient to change the front and rear positions of the second releasing member 81 manually. The second mounting housing 16 correspondingly includes a third opening 1605 allowing the second push block 812 to move, and the third opening 1605 may also limit a travel of the second push block 812.

[0383] As shown in FIG. 15 and FIG.16, in some embodiments, the upper end of the support pipe 11 extends into the second mounting housing 16 through the second sleeve portion 160 of the second mounting housing 16, and the fixing member 41 disposed at the upper end of the support pipe 11 is also received inside the second mounting housing 16 accordingly. The second mounting housing 16 includes a fourth opening 1606 allowing the swing arm 21 to pass through, and the fourth opening 1606 also assists in limiting the swing angle of the swing arm 21.

[0384] It should be noted that although the fixing member 41 in the first embodiment and the second embodiment is arranged inside the support pipe 11, in other embodiments, the fixing member 41 may not be arranged inside the support pipe 11. For example, the fixing member 41 is fixed on an outside of the support pipe 11, and the pivot 211 is pivotally connected to the fixing member 41 on the outside of the support pipe 11, such that the support pipe 11 needs not to be provided with the first through hole 110 described above.

[0385] A swing mechanism is also provided in this embodiment. The swing mechanism includes the fixing member 41, the swing arm 21 and the abutting member 42. The differences between the swing mechanism in this embodiment and the swing mechanism in the first embodiment are mainly described hereinafter, and the same or similarities thereof will not be described repeatedly.

[0386] The limiting member 43 is arranged inside the limiting groove 411. More specifically, the limiting member 43 is, for example, a plate piece inserted into the limiting groove 411 of the fixing member 41, and the position of the limiting member 43 inside the limiting groove 411 is adjustable. The limiting member 43 includes the opening 430 allowing the pivot 211 to pass through, and the opening 430 includes the first hole portion 4301 and the second hole portion 4302. The first hole portion 4301 is formed, for example, by butting two sector-shaped sub-holes. The first hole portion 4301 includes the first wall 43011 and the second wall 43012, and the first limiting surface 4111 and the second limiting surface 4112 are formed on the first wall 43011 and the second wall 43012. The second hole portion 4302 is configured to engage with the abutting member 42 to lock the swing ami. [0387] The swing mechanism, by adjusting a position of the limiting member 43 inside the limiting groove 411, restricts a limit swing position (i.e., the swing angle range) of the swing arm 21 by means of the first hole portion 4301 engaging with the abutting member 42, and locks the swing arm 21 by means of the second hole portion 4302 engaging with the abutting member 42.

[0388] In addition, the swing mechanism is provided with the second swing locking mechanism 8 and the second elastic element 45 to adjust the position of the limiting member 43 inside the limiting groove 411.

[0389] The swing mechanism may not only allow the swing arm 21 to swing within the preset angle range, but also lock the swing ami 21 and stop the swing arm 21 from swinging.

[0390] Third Embodiment

[0391] FIG. 22 to FIG. 27 illustratively show a seat connecting structure according to a third embodiment of the present disclosure, and the seat connecting structure is applied to a baby carrier. In the third embodiment, the seat connecting structure is described hereinafter by taking the seat connecting structure applied to the baby dining chair illustrated in the first embodiment and the second embodiment as an example. It should be understood that an application range of the seat connecting structure is not limited to the baby dining chair, but includes baby carriers of other types or includes other structures requiring a quick disassembly for a seat.

[0392] Referring to FIG. 22 and FIG. 23, the seat connecting structure includes the support frame 22, a first positioning groove 31 and a second positioning groove 32, and the locking device 9. The first positioning groove 31 and the second positioning groove 32 are formed on a first surface of the seat 3. The support frame 22 includes the first support rod 221 and the second support rod 222 which are oppositely arranged. Referring to the foregoing description of the first embodiment, the first support rod 221 and the second support rod 222 each extend in the front and rear directions. In addition, the support frame 22 further includes at least one cross bar, and the at least one cross bar includes, for example, the first cross bar 223, the second cross bar 224 and the third cross bar 225.

[0393] Referring to FIG. 23, a first surface of the seat 3, more specifically, the bottom surface of the base 305, includes the first positioning groove 31 and the second positioning groove 32. The first positioning groove 31 is configured to receive the first support rod 221, and the second positioning groove 32 is configured to receive the second support rod 222. When the first support rod 221 and the second support rod 222 are locked into the first positioning groove 31 and the second positioning groove 32 respectively, they may both support the seat 3 and restrict a movement of the seat 3 relative to the support frame 22 in the left-right direction.

[0394] The bottom surface of the seat 3 further includes a positioning groove for receiving at least one cross bar. For example, the bottom surface of the base 305 also includes a third positioning groove 331, a fourth positioning groove 332 and a fifth positioning groove 333. The first cross bar 223, the second cross bar 224 and the third cross bar 225 may be locked into the third positioning groove 331, the fourth positioning groove 332 and the fifth positioning groove 333, respectively. When these cross bars are locked into the corresponding positioning grooves, on one hand, they may support the seat 3, and on the other hand, they may restrict the movement of the seat 3 relative to the support frame 22 in the front rear directions. In order to facilitate the installation of each support rod and each cross bar, the first positioning groove 31, the second positioning groove 32, the third positioning groove 331, the fourth positioning groove 332 and the fifth positioning groove 333 communicate. It should be understood that the movement of the seat 3 relative to the support frame 22 in the front and rear directions may be restricted by many ways, which are not limited to a combination of the cross bars and the positioning grooves described above.

[0395] In the first embodiment and the second embodiment, two ends of the support frame 22 are connected to the main frame 1 through the swing arms 21, so that the seat 3 has the swing mode. But it should be noted that, in some embodiments, the support frame 22, for example, is directly or indirectly fixed on the main frame 1, so that the seat 3 does not have the swing mode. In addition, in some embodiments, the first support rod 221 and the second support rod 222 do not extend in the front and rear directions but in the left and right directions; in this case, when the first support rod 221 and the second support rod 222 are locked into the first positioning groove 31 and the second positioning groove 32, respectively, the movement of the seat 3 relative to the support frame 22 in the front and rear directions is restricted, and the movement of the seat 3 in the left and right directions may be achieved by any other proper structure.

[0396] Referring to FIG. 22 and FIG. 23, a second surface, facing away from the first surface, of the seat 3, for example, a top surface of the seat 3, more specifically, the top surface of the base 305, includes a first sliding groove 33 and a second sliding groove 34. An extension direction of the first sliding groove 33 is substantially perpendicular to and intersects with an extension direction of the first positioning groove 31, and an extension direction of the second sliding groove 34 is substantially perpendicular to and intersects with an extension direction of the second positioning groove 32.

[0397] Referring to FIG. 22 and FIG. 23, the locking device 9 includes a first blocking member 91, a second blocking member 92 and an elastic element 93. Both the first blocking member 91 and the second blocking member 92 slidably engage with the seat 3. For example, the first blocking member 91 is slidably disposed in the first sliding groove 33, and the second blocking member 92 is slidably disposed in the second sliding groove 34. The elastic element is configured to drive the first blocking member 91 to be at a locking position, and in this case, the first blocking member 91 is located below the first support rod 221 to prevent the first support rod 221 from being detached from the first positioning groove 31, that is, the first support rod 221 is locked between the first blocking member 91 and the seat 3. The elastic element is also configured to drive the second blocking member 92 to be at a locking position, and in this case, the second blocking member 92 is located below the second support rod 222 to prevent the second support rod 222 from being detached from the second positioning groove 32, that is, the second support rod 222 is locked between the second blocking member 92 and the seat 3. Thus, when the locking device 9 is in the locking state, the first blocking member 91 and the second blocking member 92 lock the connection relationships between the first support rod 221, the second support rod 222 and the seat 3. In some embodiments, the first blocking member 91 and the second blocking member 92 are arranged separately or connected together.

[0398] According to the connection relationship between the first blocking member 91 and the second blocking member 92, the elastic element 93 may include one or more springs. For example, when the first blocking member 91 and the second blocking member 92 are arranged separately, the elastic element includes one spring for driving the first blocking member 91 and another spring for driving the second blocking member 92. In the third embodiment, the first blocking member 91 and the second blocking member 92 are connected together, and in this case, the elastic element includes one spring, and the spring acts on the first blocking member 91 and the second blocking member 92 at the same time.

[0399] Referring to FIG. 24 to FIG. 27, when the seat 3 needs to be removed from the support frame 22, the first blocking member 91 and the second blocking member 92 are driven to move toward an opening direction N, so that the first blocking member 91 and the second blocking member 92 exit the first positioning groove 31 and the second positioning groove 32 at the same time, and the locking device 9 is switched to the unlocking state shown in FIG. 26 and FIG. 27. At this time, the seat 3 may be lifted up and easily disassembled from the support frame 22.

[0400] When the seat 3 needs to be installed on the support frame 22, under the action of an external force, the locking device 9 is switched to the unlocking state, then the first support rod 221 is locked into the first positioning groove 31, and the second support rod 222 is locked into the second positioning groove 32, finally the external force is withdrawn, and the elastic element 93 automatically drives the first blocking member 91 and the second blocking member 92 to be inserted into the first positioning groove 31 and the second positioning groove 32, so that the first blocking member 91 and the second blocking member 92 move to the locking position. As described above, in this case, the locking device 9 is switched to the locking state shown in FIG. 24 and FIG. 25, and the seat 3 is locked on the support frame 22. The seat connecting structure provided in the third embodiment has a simple structure and allows a quick disassembly or assembly of the seat 3 and the support frame 22.

[0401] FIG. 23 shows an exemplary embodiment in which the first blocking member 91 and the second blocking member 92 are integrally connected. More specifically, the first blocking member 91 and the second blocking member 92 are integrally connected by a connecting bracket 94. In order to receive the connecting bracket 94, the top surface of the seat 3 may also have a third sliding groove 35, the first sliding groove 33 and the second sliding groove 34 communicate by means of the third sliding groove 35. A groove depth of the third sliding groove 35 is less than a groove depth of the first sliding groove 33 and a groove depth of the second sliding groove 34. The connecting bracket 94 is disposed in the third sliding groove 35, and two ends of the connecting bracket 94 are respectively provided with a first surface 941 and a second surface 942 bent downwards relative to the connecting bracket 94. The first blocking member 91 is connected to the first surface 941, and the second blocking member 92 is connected to the second surface 942. The first blocking member 91 and the second blocking member 92 are bent in the same direction relative to the first surface 941 and the second surface 942, respectively. In some not-shown embodiments, the elastic element 93 includes at least one spring disposed in the first sliding groove 33 and/or in the second sliding groove 34, the at least one spring keeps the locking device 9 in the locking state by abutting against the first surface 941 and/or the second surface 942.

[0402] Referring to FIG. 22, the connecting bracket 94 includes a mounting hole 940, and a fastener 945 is installed inside the mounting hole 940. The fastener 945 is, for example, a bolt. The bottom wall of the third sliding groove 35 includes a fourth elongated hole 351, and the fastener 945 slidably engages with the fourth elongated hole 351. A first end (a threaded end) of the fastener 945 is configured to passes through the mounting hole 940 and the fourth elongated hole 351 in sequence and stretches downwards. When the seat 3 needs to be removed from the support frame 22, the fastener 945 is pushed along the opening direction N (shown in FIG. 25) manually, and the fastener 945 moves along the fourth elongated hole 351 to drive the connecting bracket 94 to move at the same time, so that the first blocking member 91 and the second blocking member 92 exit the first positioning groove 31 and the second positioning groove 32 at the same time.

[0403] Referring to FIG. 1 and FIG. 22 together, in the third embodiment, the first sliding groove 33, the second sliding groove 34 and the third sliding groove 35 are covered by a seat portion 3071, which may prevent foreign matters from entering to interfere with the movement of the connecting bracket 94. Of course, in some embodiments, the first sliding groove 33, the second sliding groove 34 and the third sliding groove 35 are covered by any suitable structure.

[0404] Referring to FIG. 25 and FIG. 27, in order to facilitate the unlocking operation of the locking device 9, a first end of the fastener 945 is connected to a third releasing member 95. For example, as shown in FIG. 22, the third releasing member 95 is connected to the first end of the fastener 945 through a threaded hole 950. The third releasing member 95 may have a relatively large volume, so that a user can operate easily. In addition, the bottom surface of the seat 3 also includes a fourth sliding groove 36, the fourth sliding groove 36 and the third sliding groove 35 are adjacent in the extension direction of the fastener 945, and the fourth sliding groove 36 is located between the first sliding groove 33 and the second sliding groove 34. As can be seen from the figure, the fourth sliding groove 36 is located below the third sliding groove 35. The third releasing member 95 is received in the fourth sliding groove 36.

[0405] Referring to FIG. 25 and FIG. 27, the elastic element 93 in the third embodiment is a spring installed in the fourth sliding groove 36, and the spring is clamped between the side wall of the fourth sliding groove 36 and the third releasing member 95, so that the structure is more compact. More specifically, as shown in FIG. 22, a first end of the third releasing member 95 includes a first receiving groove 951, and the first receiving groove 951 is configured to receive the end of the elastic element 93. In addition, a second end of the third releasing member 95 may be provided with a pressing recess 952 convenient for a manual press.

[0406] Referring to FIG. 24 and FIG. 26, part region of the fourth sliding groove 36 may be covered by a shielding plate 361, and the shielding plate 361 is configured to shield the elastic element 93, so as to prevent foreign matters from interfering with a normal operation of the elastic element 93.

[0407] Fourth Embodiment

[0408] FIG. 28 to FIG. 29 illustratively show the seat connecting structure according to the fourth embodiment of the present disclosure, and the difference of the seat connecting structure provided in the fourth embodiment differs and the seat connecting structure provided in the third embodiment above is the implementation of the locking device 9. If no conflict occurs, for the components and the connection relationship between the components in this embodiment, reference may be made to the description in the third embodiment above.

[0409] Referring to FIG. 28, in the fourth embodiment, the first blocking member 91 and the second blocking member 92 of the locking device 9 are separated from each other instead of being connected integrally. The first sliding groove 33 and the second sliding groove 34 for installing the first blocking member 91 and the second blocking member 92 respectively are formed in a main groove 304, and the groove depth of the main groove 304 is constant. In the case that the first positioning groove 31 and the second positioning groove 32 extend along the front and rear directions, the main groove 304 extends along the left and right directions, and the extension direction of the main groove 304 is substantially perpendicular to the extension directions of the first positioning groove 31 and the second positioning grooves 32. The first blocking member 91 and the second blocking member 92 slidably engage with the main groove 304, and when a thrust in the opening direction N (shown in FIG. 31) is exerted on the first blocking member 91 and the second blocking member 92, they move towards each other, so that the locking device 9 is switched to the unlocking state shown in FIG. 32 and FIG. 33. The elastic element 93 includes a first spring 931 and a second spring 932, and the first spring 931 and the second spring 932 are arranged at intervals in the front-rear direction and are respectively clamped between the first blocking member 91 and the second blocking member 92. The first spring 931 and the second spring 932 are configured to drive the first blocking member 91 and the second blocking member 92 to move away from each other, so that the locking device 9 is switched to the locking state shown in FIG. 30 and FIG. 31. In some embodiments, one of the first spring 931 and the second spring 932 is selectively arranged between the first blocking member 91 and the second blocking member 92, which can also achieve the effect of driving the first blocking member 91 and the second blocking member 92 to move away from each other.

[0410] Referring to FIG. 28 to FIG. 30, the locking device 9 also includes a second linking member 96. The second linking member 96 is located in the main groove 304 and is operatively connected to the first blocking member 91 and the second blocking member 92. When one of the first blocking member 91 and the second blocking member 92 is pushed to release one of the first support rod 221 and the second support rod 222, under the action of the second linking member 96, the other of the first blocking member 91 and the second blocking member 92 is pushed accordingly, and the other of the first support rod 221 and the second support rod 222 is released synchronously.

[0411] FIG. 28 and FIG. 29 show exemplary structures of the second linking member 96, the first blocking member 91 and the second blocking member 92. [0412] A first end 901 of the first blocking member 91 and a first end 902 of the second blocking member 92 are away from each other, and the first end 901 of the first blocking member 91 and the first end 902 of the second blocking member 92 are configured to, under the action of the elastic element 93, extend into the first positioning groove 31 and the second positioning groove 32, so that the first support rod 221 is locked between the first blocking member 91 and the seat 3, and the second support rod 222 is locked between the second blocking member 92 and the seat 3. Thus, the first blocking member 91 and the second blocking member 92 prevent the first support rod 221 and the second support rod 222 from being detached from the first positioning groove 31 and the second positioning groove 32, respectively, thereby locking the connection relationship between the first support rod 221, the second support rod 222 and the seat 3. A first connecting boss 911 is arranged on a second end of the first blocking member 91, and a second connecting boss 921 is arranged on a second end of the second blocking member 92, and the second end of the first blocking member 91 and the second end of the second blocking member 92 (not marked in the figure), which are proximate to each other.

[0413] The second linking member 96 is a rod, and a middle part thereof is connected to the groove bottom of the main groove 304 through the pivot 963. The first end of the second linking member 96 is pivotally connected to the first connecting boss 911. For example, the first end of the second linking member 96 is provided with a first protruding column 961, the first connecting boss 911 includes a fifth elongated hole 9111, and the first protruding column 961 slidably engages with the fifth elongated hole 9111. The second end of the second linking member 96 is pivotally connected to the second connecting boss 921. For example, the second end of the second linking member 96 is provided with a second protruding column 962, the second connecting boss 921 includes a sixth elongated hole 9211, the second protruding column 962 slidably engages with the sixth elongated hole 9211. In some embodiments, the position of the first protruding column 961 on the second linking member 96 and the position of the fifth elongated hole 9111 on the first connecting boss 911 may be interchanged, and the position of the second protruding column 962 on the second linking member 96 and the position of the sixth elongated hole 9211 on the second connecting boss 921 may also be interchanged. The structures of the second linking member 96, the first blocking member 91 and the second blocking member 92 are not limited to the above examples.

[0414] Referring to FIG. 30 and FIG. 32, the first spring 931 is arranged between the end of the first connecting boss 911 and the second blocking member 92, and the second spring 932 is arranged between the end of the second connecting boss 921 and the first blocking member 91. More specifically, as shown in FIG. 29, a first positioning column 9113 is arranged on the end of the first connecting boss 911, and the second blocking member 92 includes a second receiving groove 9213 located at a position opposite to the first positioning column 9113. The first end of the first spring 931 fits over the first positioning column 9113, and the second end of the first spring 931 is configured to extend into the second receiving groove 9213, thus the first spring 931 is firmly clamped between the first connecting boss 911 and the second blocking member 92. Similarly, a second positioning column 9215 is arranged on the end of the second connecting boss 921, and the first blocking member 91 includes a third receiving groove 9115 located at a position opposite to the second positioning column 9215. The first end of the second spring 932 fits over the second positioning column 9215, and the second end of the second spring 932 is configured to extend into the third receiving groove 9115, thus the second spring 932 is firmly clamped between the second connecting boss 921 and the first connecting boss 911. [0415] Referring to FIG. 28 to FIG. 31, in order to save space, a first recess 9112 is formed on the bottom surface of the first connecting boss 911, and the first recess 9112 is located below the fifth elongated hole 9111. A first end of the second linking member 96 is received in the first recess 9112, and the first protruding column 961 is configured to enter the fifth elongated hole 911 through the first recess 9112. The shape of the first recess 9112 is designed not to interfere with a rotation of the second linking member 96, for example, the first recess 9112 has a triangular shape. A second recess 9212 is formed on the bottom surface of the second connecting boss 921, and the second recess 9212 is located below the sixth elongated hole 9211. A second end of the second linking member 96 is received in the second recess 9212, and the second protruding column 962 is configured to enter the sixth elongated hole 9211 through the second recess 9212. The shape of the second recess 9212 is designed not to interfere with a rotation of the second linking member 96, for example, the second recess 9212 has a triangular shape.

[0416] Referring to FIG. 28 and FIG. 31, a first wedge 97 and a second wedge 98 are arranged on the side wall of the main groove 304, and the first wedge 97 is located above the first blocking member

91 and abuts against the first blocking member 91 downwards, and the second wedge 98 is located above the second blocking member 92 and abuts against the second blocking member 92 downwards, so that the first blocking member 91, the second linking member 96 and the second blocking member

92 are restricted in the main groove 304.

[0417] Referring to FIG. 1 and FIG. 28, in the fourth embodiment, the main groove 304 is covered by the seat portion 3071, thereby preventing foreign matters from entering to interfere with the movement of the locking device 9. In some embodiments, the main groove 304 may be covered by any proper structure.

[0418] Referring to FIG. 29, FIG. 31 and FIG. 32, the first end 901 of the first blocking member 91 and the first end 902 of the second blocking member 92, which are away from each other, are provided with a pushing bevel respectively. Specifically, the first end 901 of the first blocking member 91 is provided with the first pushing bevel 9011, and the first end 902 of the second blocking member 92 is provided with a second pushing bevel 9021. On one hand, the first pushing bevel 9011 and the second pushing bevel 9021 make it convenient to push the first blocking member 91 and the second blocking member 92 manually to release the locking device 9, and on the other hand, when the seat 3 and the support frame 22 are installed together, the locking device 9 may be released without manual operation, but by the first support rod 221 and the second support rod 222 abutting against the first pushing bevel 9011 and the second pushing bevel 9021 respectively, so that the first support rod 221 and the second support rod 222 are locked into the first positioning groove 31 and the second positioning groove 32 easily.

[0419] The present disclosure further provides a baby carrier, and the baby carrier may be a baby stroller, a baby dining chair, or any other carrier. The baby carrier includes the main frame 1, the swing bracket assembly 2, the seat 3 and the seat connecting structure above. The swing bracket assembly 2 is connected to the seat 3 by the seat connecting structure, and the support frame 22 is installed directly or indirectly on the main frame 1.

[0420] Fifth Embodiment

[0421] FIG. 34 to FIG. 54 illustratively show a structure of the baby carrier provided by the fifth embodiment of the present disclosure. As the first embodiment and the second embodiment illustrated above, the baby carrier of the fifth embodiment is also illustrated by taking the baby dining chair for an example. The type of the baby carrier is not limited to the baby dining chair. Referring to FIG. 34 and FIG. 37, the baby carrier includes, for example, the main frame 1, the swing bracket assembly 2 and the seat 3.

[0422] Referring to FIG. 36 and FIG. 37, the structure of the main frame 1 in the fifth embodiment is similar to the structure of the main frame 1 in the first embodiment above. The main frame 1 includes two front foot supports 101, two rear foot supports 102, the front cross bar 1031 connected between the two front foot supports 101, the rear cross bar 1032 connected between the two rear foot supports 102, the folding member 104 connected between the front foot support 101 and the rear foot support 102 on the same side, and the support pipes 11 each arranged on the upper part of the corresponding front foot support. For the interrelationships of these components, reference may be made to the description in the first embodiment, which will not be repeated herein.

[0423] Refer to FIG. 36, FIG. 37 and FIG. 49, in the fifth embodiment, the swing bracket assemblies 2 each are arranged on the left and right sides of the main frame 1, respectively, and the left and right sides of the seat 3 are connected to the main frame 1 through a corresponding swing bracket assembly 2. In some embodiments, each swing bracket assembly 2 includes the swing arm 21 and an auxiliary swing arm 29. The auxiliary swing arm 29 is parallel to the swing arm 21, and the auxiliary swing arm 29 assists the swing arm 21 in supporting the seat 3. In order to facilitate the installation of the swing bracket assembly 2, the main frame 1 further includes a third mounting housing 17, and the third mounting housing 17 is installed on the main frame 1. More specifically, the third mounting housing 17 is mounted on the support pipe 11, and upper ends of the swing arm 21 and auxiliary swing arm 29 are pivotally connected to the third mounting housing 17, respectively.

[0424] Referring to FIG. 40, in some embodiments, the third mounting housing 17 is formed by butting the fifth housing portion 171 and the sixth housing portion 172, for example, the fifth housing portion 171 and the sixth housing portion 172 are joined together and secured with screws 179. The fifth housing portion 171 is closer to the longitudinal center plane of the baby carrier than the sixth housing portion 172. The sixth housing portion 172 has, for example, a third sleeve portion 170, and the third sleeve portion 170 fits over the end of the support pipe 11. If no conflict occurs, for the connection mode of the support pipe 11 and the third sleeve portion 170, reference may be made to the connection mode of the first sleeve portion 150 and the support pipe 11 in the first embodiment above. An operating button 174 (shown in FIG. 36) may be installed on the sixth housing portion 172, and for the function of the operating button 174, reference may be made to the function of the operating button 154 in the first embodiment.

[0425] Referring to FIG. 36 and FIG. 37, the upper end of the swing arm 21 and the upper end of the auxiliary swing arm 29 each are pivotally connected to the third mounting housing 17, and the lower end of the swing arm 21 and the lower end of the auxiliary swing arm 29 each are pivotally connected to the seat 3. The swing arm 21 and the auxiliary swing arm 29 parallel to each other form two opposite sides of a parallelogram. While swinging, the swing arm 21 and the auxiliary swing arm 29 drive the seat 3 to swing, and the seat 3 remains horizontal while swinging, which brings a more comfortable and safer riding experience for the baby seated in the seat 3. The seat 3 remains horizontal during the swing, which allows the swing angle range of the swing arm 21 and the auxiliary swing arm 29 to be greater than the swing angle ranges exemplified in the embodiments above. For example, the maximum angle a that the swing arm 21 and the auxiliary swing arm 29 swing backwards relative to their starting positions (shown in FIG. 34, the swing arm 21 and the auxiliary swing arm 29 at the starting position are substantially perpendicular to the ground) is greater than 20 degrees (shown in FIG. 36), for example, is 25 degrees or even greater than 25 degrees. The maximum angle 0 that the swing arm 21 and the auxiliary swing arm 29 swing forwards is also greater than 20 degrees (shown in FIG. 35), for example, is 25 degrees or even greater than 25 degrees.

[0426] Referring to FIG. 37, in order to facilitate the connection between each of the swing bracket assembly 2 and the seat 3, in some embodiments, each swing bracket assembly 2 further includes a connector 28. The description below is exemplified by taking a connection relationship between the swing bracket assembly 2 at the left side and the seat 3 as an example, the structure of the swing bracket assembly 2 at the right side is symmetrical to the structure of the swing bracket assembly 2 at the left side and will not be described repeatedly hereinafter.

[0427] Referring to FIG. 40, FIG. 45 and FIG. 53, the lower end of the swing arm 21 and the lower end of the auxiliary swing arm 29 each are pivotally connected to the connector 28. For example, the lower end of the swing arm 21 is provided with a pivot 219, and the lower end of the auxiliary swing arm 29 is provided with a pivot 291 (shown in FIG. 53). The pivot 219 and the pivot 291 are parallel to each other, and the pivot 219 and the pivot 291 are inserted into corresponding mounting holes 2810 in the connector 28 respectively. The connector 28 may be provided with a protrusion 280 extending upwards, and a locking portion 281 is arranged on the wall of the protrusion 280, and the locking portion 281 is, for example, an elastic stopping block. Referring to FIG. 50, the bottom of the seat 3 forms a groove 3062 for receiving the protrusion 280, and a wall of the groove 3062 forms a locking hole 30621. Referring to FIG. 54, when the seat 3 and the swing bracket assembly 2 need to be connected, the protrusion 280 of the connector 28 is inserted into the groove 3062, so that the locking portion 281 engages with the locking hole 30621.

[0428] The connection mode between the connector 28 and the seat 3 is not limited to the above example, for example, in some embodiments, the position of the locking portion 281 on the protrusion 280 and the position of the locking hole 30621 on the seat 3 may be exchanged. In some embodiments, the connection between the connector 28 and the seat 3 may be a detachable connection or a non- detachable connection, and the connection between the swing arm 21 and the connector 28, and the connection between the auxiliary swing arm 29 and the connector 28 each may be a detachable connection or a non-detachable connection. In addition, it should be noted that, in the above embodiments, although the swing arm 21 and the auxiliary swing arm 29 are connected to the seat 3 through the connector 28, in some embodiments, the swing arm 21 and the auxiliary swing arm 29 each are pivotally connected to the seat 3 directly.

[0429] FIG. 40 and FIG. 53 show an exemplary connection structure of the auxiliary swing arm 29 and the third mounting housing 17. A pivot 292 is arranged on the upper end of the auxiliary swing arm 29, and the pivot 292 and the pivot 291 are parallel to each other. After passing through the hole 1703 in the fifth housing portion 171, the pivot 292 is inserted into a hole socket 1721 of the sixth housing portion 172. A shaft sleeve 293 fits over the pivot 292, and is fixed on the pivot 292, for example, with a fastener 295. The shaft sleeve 293 is made of wear-resistant material with a small friction coefficient, which may reduce a friction between the pivot 292 and the third mounting housing 17. The shaft sleeve 293 engages with a chamber in the third mounting housing 17 to restrict an axial position of the pivot 292.

[0430] Referring to FIG. 36 and FIG. 50, an exemplary structure of the seat 3 is shown. The structure of the seat 3 is similar to the structure of the seat 3 in the first embodiment above. The seat 3 includes the base 305, the two safety fences 306, the back 307, the dinner plate 308 or the front armrest, and the foot shelf 309. If no conflict occurs, for connection relationships between these components of the seat 3, reference may be made to the structure of the seat 3 in the first embodiment above, which will not be described repeatedly hereinafter.

[0431] In some embodiments, the swing limiting mechanism 4 (shown in FIG. 40) is arranged between the swing arm 21 and the main frame 1 on at least one side, and the swing limiting mechanism 4 is configured to restrict the swing angle of the swing arm 21, thereby controlling the swing range of the seat 3, and achieving the riding safety and comfort of the seat 3 in the swing mode. Referring to FIG. 36, FIG. 38 to FIG. 40, in the fifth embodiment, two swing limiting mechanisms 4 are arranged between their respective swing arms 21 and the main frame 1 on the left and right sides. For the convenience of description, only the exemplary structure of the swing limiting mechanism 4 between the swing arm 21 and the main frame 1 at the left side is described, and the swing limiting mechanism 4 between the swing arm 21 and the support pipe 11 at the right side is symmetrical to the swing limiting mechanism 4 at the left side, and will not be further described hereinafter.

[0432] Referring to FIG. 38 to FIG. 40, the support pipe 11 includes the first through hole 110 transversely running through the wall of the support pipe 11, and the first through hole 110 is adj cent to the upper end of the support pipe 11. The swing limiting mechanism 4 includes the fixing member 41, and the fixing member 41 is fixed on the main frame 1. More specifically, the fixing member 41 is sleeved inside the first through hole 110 and fixed in the third mounting housing 17. In some embodiments, the fixing member 41 may also be fixed on the main frame 1 through other the structures. For example, the third mounting housing 17 is installed on the support pipe 11, and the fixing member 41 is not directly sleeved inside the first through hole 110 of the support pipe 11, but installed on any other suitable structure of the third mounting housing 17, so that the fixing member 41 is indirectly installed on the support pipe 11 of the main frame 1.

[0433] Referring to FIG. 38 to FIG. 40, a circumferential rotation of the fixing member 41 is restricted. In some embodiments, a second axial guiding portion 114 is formed on a hole wall of the first through hole 110, and the second axial guiding portion 114 is configured to, during assembly, guide an axial movement of the fixing member 41, and after assembly, prevent the fixing member 41 from rotating relative to the support pipe 11. In some embodiments, the second axial guiding portion 114 includes, for example, a sunk opening formed on the hole wall of the first through hole 110, and a protruding bar 4107 engaging with the sunk opening is arranged on the outer periphery of the fixing member 41. It should be noted that, there are many implementations of the second axial guiding portion 114. In some embodiments, the second axial guiding portion 114 may include, for example, a protrusion formed on the hole wall of the first through hole 110, and a corresponding sliding groove engaging with the protrusion is formed on the outer periphery of the fixing member 41.

[0434] Referring to FIG. 38 to FIG. 40, the fixing member 41 includes a limiting groove 411, and an extension direction of the limiting groove 411 is parallel to an axial direction of the pivot 211 arranged at the upper end of the swing arm 21, therefore, the extension direction of the limiting groove 411 may also be referred to as the axial direction of the limiting groove 411. The limiting groove 411 has, for example, a groove opening 41101 and a groove bottom 41102, and the groove opening 41101 faces the fifth housing portion 171. In some embodiments, the fifth housing portion 171 is provided with a sleeve 1712, and the sleeve 1712 is sleeved in the limiting groove 411 of the fixing member 41 through the groove opening 41101, and the sleeve 1712 is configured to support the fixing member 41. In some embodiments, the groove bottom 41102 is located inside the first through hole 110, and the groove bottom 41102 may be limited by a flange 1105 formed on the first through hole 110. In some embodiments, the groove bottom 41102 may, for example, pass through the first through hole 110 and be directly limited by the sixth housing portion 172. The groove bottom 41102, for example, has a center hole 41100 (shown in FIG. 41).

[0435] Referring to FIG. 45 and FIG. 46, the upper end of the swing arm 21 is provided with the pivot 211, and the pivot 211 is connected to the swing arm 21 in the non-rotatable manner, and the pivot 211 is rotatable relative to the fixing member 41. In some embodiments, the pivot 211 and the swing arm 21 are integrally formed. For example, the pivot 211 is arranged to pass through the limiting groove 411. Referring to FIG. 38 to FIG. 41, the end of the pivot 211 passes through the hole 1704 in the fifth housing portion 171 and enters the limiting groove 411, then goes out of the center hole 41100 in the groove bottom 41102. In some embodiments, a positioning groove 2117 is formed on the pivot 211, and an axial limiting member, such as a spring 27, engages with the positioning groove 2117. The spring 27 is located outside the limiting groove 411 and abuts against the groove bottom 41102to restrict an axial movement of the pivot 211. When the swing ami 21 receives a swing force, the swing arm 21, together with the pivot 211, swings around the axis of the pivot 211.

[0436] In some unshown embodiments, the first limiting surface 4111 and the second limiting surface 4112 may be formed on the inner wall of the limiting groove 411. The abutting member 42 is arranged on the pivot 211, and the abutting member 42 is connected to the pivot 211 in the non- rotatable manner and located between the first limiting surface 4111 and the second limiting surface 4112. The abutting member 42 restricts the swing angle of the swing arm 21 by means of abutting against the first limiting surface 4111 and the second limiting surface 4112. Referring to FIG. 40, in some embodiments, the abutting member 42 and the pivot 211 are separate structures, and locking grooves 2116 are formed on the pivot 211. The abutting member 42 has an engaging opening 420, and the abutting member 42 is locked in the locking grooves 2116 through the engaging opening 420. When the seat 3 is in the swing mode, the abutting member 42 restricts the swing angle of the swing arm 21 by means of abutting against the first limiting surface 4111 and the second limiting surface 4112. When the swing angle of the swing arm 21 is restricted, the swing angle of the auxiliary swing arm 29 is also restricted.

[0437] Referring to FIG. 38 to FIG. 40, in some embodiments, the limiting groove 411 has the limiting member 43. More specifically, the limiting member 43 is, for example, a plate member inserted into the limiting groove 411. The first limiting surface 4111 and the second limiting surface 4112 configured to abut against the abutting member 42 are formed on the limiting member 43. In some embodiments, the limiting member 43 slidably engages with the limiting groove 411, and the limiting member 43 may further lock the swing of the swing arm 21 by changing the position of the limiting member 43 inside the limiting groove 411.

[0438] Referring to FIG. 43, the limiting member 43 includes a first region 43a and a second region 43b, and the first region 43a and the second region 43b are sequentially arranged in the extension direction of the limiting groove 411. The first region 43a has the first limiting surface 4111 and the second limiting surface 4112, and the second region 43b is adapted to engage with the abutting member 42 to lock the swing of the swing arm 21. The limiting member 43 has a first position or a second position, and when the limiting member 43 is switched between the first position and the second position, the first region 43a and the second region 43b selectively engage with the abutting member 42. Referring to FIG. 45, when the limiting member 43 moves to the first position, the first region 43a engages with the abutting member 42, the swing arm 21 may swing, and the seat 3 is in the swing mode. The abutting member 42 abuts against the first limiting surface 4111 or against the second limiting 4— ⁷ surface 4112 along ⁷ with the swing t—⁷ of the swing arm 21, ^? and the swing ang to-⁷le of the swing arm 21 is controlled. Referring to FIG. 46, when the limiting member 43 moves to the second position, the second region 43b engages with the abutting member 42, the swing arm 21 is locked, and the seat 3 is switched from the swing mode to the fixed mode.

[0439] Referring to FIG. 43, in some embodiments, the limiting member 43 includes a force receiving plate 435, and two arms 436 extending from the force receiving plate 435. Referring to FIG. 38 and FIG. 39, the abutting member 42 is adjacent to the groove opening 41101, and the force receiving plate 435 is adjacent to the groove bottom 41102, and the two arms 436 extend from the force receiving plate 435 towards the groove opening 41101, that is, the two arms 436 extend along the axial direction of the limiting groove 411. The force receiving plate 435 is configured to receive a driving force to make the limiting member 43 move axially. The force receiving plate 435 has a center hole 4350, and the pivot 211 is configured to pass through the center hole 4350.

[0440] Referring to FIG. 43, in order to prevent the limiting member 43 from rotating relative to the fixing member 41, the outer contour of the force receiving plate 435 has a non-circular shape. Referring to FIG. 41, a side wall 41131 of the limiting groove 411 has a first axial guiding portion 4113 that slidably engages with the force receiving plate 435, and the first axial guiding portion 4113 is configured to guide an axial movement of the limiting member 43. The first region 43a and the second region 43b are formed at different axial positions of each arm 436. By controlling back and forth movements of the limiting member 43 between the first position and the second position, the first region 43a and the second region 43b selectively engages with the abutting member 42. In FIG. 43, the first region 43a is closer to the force receiving plate 435 than the second region 43b. In some embodiments, the axial positions of the first region 43a and the second region 43b may be exchanged, such that the first region 43a is farther way from the force receiving plate 435 than the second region 43b.

[0441] Referring to FIG. 38 and FIG. 42, the abutting member 42, for example, is located between a step 4106 and an end of the sleeve 1712 in the limiting groove 411, so that an axial movement of the abutting member 42 is restricted. In some embodiments, an axial position of the abutting member 42 may also be fixed by any other suitable structure. Two first groove portions 427 are formed on the outer periphery of the abutting member 42, and each of the first groove portions 427 includes a first end wall 4271 and a second end wall 4272 opposite to each other. The two arms 436 of the limiting member 43 are configured to pass through the two first groove portions 427, respectively. Referring to FIG. 44 and FIG. 45, when the first region 43a engages with the abutting member 42, the swing arms 21 may swing, and the abutting member 42 rotates around the axis of the pivot 211. When the first end walls 4271 swing to abut against respective first limiting surfaces 4111 of the corresponding first regions 43a, the swing arm 21 cannot continue to swing in the first direction Tl. Similarly, when the second end walls 4272 swing to abut against respective second limiting surfaces 4112 of the corresponding first regions 43a, the swing arm 21 cannot continue to swing in the second direction T2. The first direction Tl and the second direction T2 are opposite. It should be noted that although two arms 436 and two first groove portions 427 are taken as an example for illustration, in some embodiments, the number of the arm 436 and the number of the first groove portion 427 may be, for example, one or more, respectively.

[0442] Referring to FIG. 43, a first clamping block 4363 is arranged on the second region 43b of each of the arms 436, and each first clamping block 4363 extends inwards radially. Referring to FIG. 42 and FIG. 44, the abutting member 42 may also be provided with two second groove portions 428, and the two second groove portions 428 are formed at the groove bottom s 4273 of the two first groove portions 427, respectively. Referring to FIG. 46, when the second region 43b engages with the abutting member 42, the two second groove portions 428 are adapted to engage with the first clamping blocks 4363, respectively, and at this time, the abutting member 42 and the swing arm 21 are locked and cannot swing. It should be understood that although two second groove portions 428 and two first clamping blocks 4363 are taken as an example for illustration, in some embodiments, the number of the second groove portion 428 and the number of the first clamping block 4363 are, for example, one or more, respectively.

[0443] Referring to FIG. 51, in some embodiments, the first groove portion 427 and the second groove portion 428 in each set coincide with each other. At this time, referring to FIG. 52, the structure of the first region 43a of each arm 436 may not change, and the second region 43b of each arm 436 may include second clamping blocks 4365 extending in the directions perpendicular to the extension direction of each arm 436. When the first region 43a of each of the arm 436 engages with the corresponding first groove portion 427, the swing arm 21 can swing. When the second region 43b of each arm 436 engages with the first groove portion 427 (also equivalent to the second groove portion 428), each of the second clamping blocks 4365 engages with the corresponding first groove portion 427, and the swing of the swing arm 21 is locked.

[0444] Referring to FIG. 38 to FIG. 40, a third elastic element 46 is arranged in the limiting groove 411, and the third elastic element 46 is configured to apply a driving force to the force receiving plate 435 to force the force receiving plate 435 to move towards the groove bottom 41102. In some embodiments, the third elastic element 46 is, for example, clamped between the abutting member 42 and the force receiving plate 435. In addition, the baby carrier may also include a third swing locking mechanism 47, and the third swing locking mechanism 47 is operatively connected to the force receiving plate 435 to drive the limiting member 43 to be switched between the first position and the second position. That is, under the action of the third elastic element 46 and the third locking mechanism 47, the force receiving plate 435 may move axially along the limiting groove 411, so that the limiting member 43 moves to the first position or the second position. As described above, when the limiting member 43 is at the first position, the first region 43a of the arm 436 engages with the abutting member 42, and the seat 3 is in the swing mode. When the limiting member 43 is at the second position, the second region 43b of the arm 436 engages with the abutting member 42, and the swing arm 21 cannot swing, and the seat 3 is in the fixed mode.

[0445] Referring to FIG. 38 to FIG. 41 and FIG. 47 and FIG. 48, an exemplary implementation of the third swing locking mechanism 47 is shown. The third swing locking mechanism 47 includes a driving wheel 471, and the driving wheel 471 fits over the pivot 211 through the center hole 4710 and is located between the force receiving plate 435 and the groove bottom 41102. The driving wheel 471 abuts against one side, facing the groove bottom 41102, of the force receiving plate 435. The wall of the limiting groove 411 is provided with ratchet portions 4117, and the driving wheel 471 is provided with a ratchet groove part 4711. The ratchet groove part 4711 includes the first ratchet groove 47111 having a first groove depth Hl and a second ratchet groove 47112 having a second groove depth H2, which are sequentially arranged circumferentially. The first groove depth Hl is not equal to the second groove depth H2. The numbers of the ratchet portion 4117, the first ratchet groove 47111 and the second ratchet groove 47112 may be designed as required. For example, in some embodiments, four ratchet portions 4117 are provided, and accordingly, four first ratchet grooves 47111 and four second ratchet grooves 47112 are provided.

[0446] Referring to FIG. 38, FIG. 39 and FIG. 47, in some embodiments, the first groove depth Hl is less than the second groove depth H2. The driving wheel 471 moves axially and rotates circumferentially when receiving a pressing force S, so that the ratchet portion 4117 engages with the first ratchet groove 47111 and the second ratchet groove 47112 in sequence. In some embodiments, when the ratchet portion 4117 engages with the first ratchet groove 47111, the limiting member 43 is in the first position as shown in FIG. 45. When the ratchet portion 4117 engages with the second ratchet groove 47112, the limiting member 43 is in the second position as shown in FIG. 46. In some embodiments, when the ratchet portion 4117 engages with the first ratchet groove 47111, the limiting member 43 is in the second position, and when the ratchet portion 4117 engages with the second ratchet groove 47112, the limiting member 43 is in the first position.

[0447] Referring to FIG. 41, FIG. 47 and FIG. 48, in order to drive the driving wheel 471 easily, the third swing locking mechanism 47 further includes a press member 472. The press member 472 has a pressing portion 4721, and a pushing portion 4722 extending from the pressing portion 4721. A mounting hole 41103 is formed in the groove bottom 41102 of the limiting groove 411, and the pushing portion 4722 extends into the limiting groove 411 through the mounting hole 41103. The pushing portion 4722 is configured to apply a pressing force S to a bevel 47101 of the first ratchet groove 47111 of the driving wheel 471 or to a bevel 47102 of the second ratchet groove 47112 of the driving wheel 471, so that the driving wheel 471 simultaneously makes an axial movement and a circumferential rotation, and that the ratchet portion 4117 of the fixing member 41 engages with the first ratchet groove 47111 and the second ratchet groove 47112 in sequence. Referring to FIG. 41 and FIG. 49, in some embodiments, the pushing portion 4722 includes two pushing arms 47220 extending from the pressing portion 4721. A pushing step 47221 is formed in the middle of each pushing arm

47220 and configured to apply a pressing force S to the bevel 47101 or the bevel 47102 of the driving wheel 471. It should be understood that in some embodiments, the number of the pushing arms 47220 is not limited to two. Referring to FIG. 43, an evading opening 4351 is formed at a position on the force receiving plate 435 corresponding to a position of each pushing arm 47220.

[0448] A process of switching the seat 3 between the fixed mode and the swing mode will be described in detail herein by combining with FIG. 41, and FIG. 45 to FIG. 49.

[0449] When the seat 3 is in the fixed mode in which the seat 3 cannot swing, the swing ami 21 cannot swing, the ratchet portion 4117 engages with the second ratchet groove 47112, the limiting member 43 is in the second position as shown in FIG. 46, and the first clamping block 4363 and the second groove portion 428 engage. Press the press member 472 once at this time, the pushing step

47221 of the pushing portion 4722 will engage with the bevel 47102, to drive the driving wheel 471 to rotate in the circumferential direction while moving in the axial direction. The axial movement of the driving wheel 471 drives the limiting member 43 to leave the second position thereof, and the circumferential rotation of the driving wheel 471 drives the ratchet portion 4117 to face the bevel 47101 of the first ratchet groove 47111. Then release the press member 472, and the third elastic element 46 will exert a driving force to drive the force receiving plate 435 to move to the groove bottom 41102, thereby reversely pushing the driving wheel 471. While the bevel 47101 of the first ratchet groove 47111 of the driving wheel 471 abuts against the ratchet portion 4117, the driving wheel 471 rotates until the first ratchet groove 47111 engages with the ratchet portion 4117. At this time, the limiting member 43 reaches the first position, the swing arm 21 can swing, and the seat 3 is switched to the swing mode.

[0450] Similarly, when the seat 3 is in the swing mode, press the press member 472 once, the ratchet portion 4117 disengages from the first ratchet groove 47111 and engages with the second ratchet groove 47112, the limiting member 43 reaches the second position, and the swing arm 21 cannot swing, and the seat 3 is switched to the fixed mode.

[0451] In some embodiments, the position of the ratchet portion 4117 on the wall of the limiting groove 411 and the position of the ratchet groove portion 4711 on the driving wheel 471 may be interchanged, that is, the ratchet portion 4117 is arranged on the driving wheel 471, and the first ratchet groove 47111 and the second ratchet groove 47112 are arranged on the wall of the limiting groove 411. In this case, when the driving wheel 471 receives the pressing force S to move axially and rotate circumferentially, the ratchet portion 4117 engages with the first ratchet groove 47111 and the second ratchet groove 47112 sequentially along with the rotation of the driving wheel 471, which can also achieve the effect of controlling the limiting member 43 to be switched between the first position and the second position.

[0452] Referring to FIG. 38 and FIG. 39, in some embodiments, the third swing locking mechanism 47 further includes a restoring spring 473. In this case, after the press member 472 is pressed each time, the restoring spring 473 drives the press member 472 to reset, so that the press member 472 resets to a position convenient for a next press.

[0453] Referring to FIG. 38, FIG. 39 and FIG. 49, in some embodiments, a hook 47222 is formed at each end of the pushing arm. An axial distance between the pushing step 47221 and the hook 47222 is greater than an axial length of the driving wheel 471, and the driving wheel 471 is located between the pushing step 47221 and the hook 47222. The hook 47222 is configured to hook the driving wheel 471 after the pressing force S is withdrawn, so as to restrict a travel distance of the press member 472 in the process of resetting and prevent the pushing step 47221 from being too far away from the driving wheel 471, which is conducive to a reduction of a next pressing stroke of the press member 472. In some embodiments, each pushing arm has a protruding finger 47223, and the protruding finger 47223 is located in the limiting groove 411 and limited by the groove bottom 41102, which can prevent the press member 472 from being detached from the fixing member 41.

[0454] Referring to FIG. 40 and FIG. 47, a projecting ring 4713 is arranged on a side, facing the force receiving plate 435, of the driving wheel 471, and an outer diameter of the projecting ring 4713 is smaller than that of the driving wheel 471. A gap between the outer periphery of the proj ecting ring 4713 and the outer periphery of the driving wheel 471 allows the hook 47222 to hook. The projecting ring 4713 and the force receiving plate 435 keeps abutting against each other.

[0455] Referring to FIG. 37 and FIG. 40, in some embodiments, a limiting recess 1701 is formed on the outer side of the third mounting housing 17, and the limiting recess 1701 has a first limiting wall 17011 and a second limiting wall 17012. The swing arm 21 swings between the first limiting wall 17011 and the second limiting wall 17012. The first limiting wall 17011 and the second limiting wall 17012 may also perform a function of restricting the swing angle of the swing arm 21. In some embodiments, a limiting recess 1702 is also formed on the outer side of the third mounting housing 17, and the limiting recess 1702 corresponds to the auxiliary swing arm 29. The limiting recess 1702 has a third limiting arm 17021 and a fourth limiting arm 17022, the auxiliary swing arm 29 swings between the third limiting arm 17021 and the fourth limiting arm 17022. The third limiting arm 17021 and the fourth limiting arm 17022 perform a function of restricting the swing angle of the auxiliary swing arm 29.

[0456] In addition, in some embodiments, the third swing locking mechanism 47 may not be provided, but the first swing locking mechanism 6 in the first embodiment is arranged inside the third mounting housing 17, which may also lock the swing of the swing arm 21 to switch the seat 3 from the swing mode to the fixed mode.

[0457] It should be noted that in the above embodiment, although the swing limiting mechanism 4 is arranged between the swing arm 21 and the main frame 1, in other embodiments, the swing limiting mechanism 4 may be arranged between the auxiliary swing arm 29 and the main frame 1. In addition, in some embodiments, the swing limiting mechanism 4 may not be arranged on the support pipe 11, as long as the main frame 1 has any structure capable of positioning the fixing member 41.

[0458] In addition, the swing arm 21 and the auxiliary swing arm 29 parallel to each other provided in this embodiment may also be applied to the baby carrier provided in the first embodiment and the second embodiment above, so that the seat 3 can remain horizontal while swinging in the swing mode. [0459] A swing mechanism is also provided in this embodiment. The swing mechanism includes the fixing member 41, the swing arm 21 and the abutting member 42. The differences between the swing mechanism in this embodiment and the swing mechanism in the first embodiment are mainly described hereinafter, and the same or similarities thereof will not be described repeatedly.

[0460] The extension direction of the limiting groove 411 of the fixing member 41 is parallel to the axial direction of the pivot 211. The limiting member 43 is arranged in the limiting groove 411 of the fixing member 41. More specifically, the limiting member 43 is, for example, a plate piece inserted into the limiting groove 411 of the fixing member 41. The position of the limiting member 43 in the limiting groove 411 is adjustable. The limiting member 43 includes the first region 43a and the second region 43b, and the first region 43a has the first limiting surface 4111 and the second limiting surface 4112. The second region 43b is adapted to engage with the abutting member 42 to lock the swing arm 21. The limiting member 43 slidably engages with the limiting groove 411 and has a first position and a second position. When the limiting member 43 is in the first position, the first region 43a engages with the abutting member 42, and the swing arm 21 can swing within a preset angle range. When the limiting member 43 is in the second position, the second region 43b engages with the abutting member 42, and the swing arm 21 is locked and cannot swing. For the implementation of the limiting member 43 and the abutting member 42, reference may be made to the above description. [0461] The swing mechanism may be further provided with the third swing locking mechanism 47 and the third elastic element 46 to adjust the position of the limiting member 43 in the limiting groove 411.

[0462] The swing mechanism can not only allow the swing arm 21 to swing within the preset angle range, but also lock the swing arm 21 so that the swing arm 21 does not swing.

[0463] Sixth Embodiment

[0464] FIG. 55 to FIG. 72 illustratively show a structure of the baby carrier provided by the sixth embodiment of the present disclosure. As the baby carrier in the first embodiment, the second embodiment and the fifth embodiment, the baby carrier in the sixth embodiment is also illustrated by taking a baby dining chair as an example. The type of baby carrier is not limited to the baby dining chair. Referring to FIG. 55, the baby carrier includes, for example, the main frame 1, the swing bracket assembly 2 and the seat 3.

[0465] Referring to FIG. 55, the structure of the main frame 1 in the sixth embodiment is similar to the structure of the main frame 1 in the first embodiment. The main frame 1 includes two front foot supports 101, two rear foot supports 102, the front cross bar 1031 connected between the two front foot supports 101, the rear cross bar 1032 connected between the two rear foot supports 102, the folding member 104 connected between the front foot support 101 and the rear foot support 102 on the same side, and the support pipes 11 each arranged on an upper part of a corresponding front foot support. For the interrelationships of these components of the main frame 1, reference may be made to the description in the first embodiment, which will not be repeated herein.

[0466] Referring to FIG. 55, a structure of the seat 3 is similar to the structure of the seat 3 in the first embodiment. The seat 3 includes the base 305, two safety fences 306, the back 307, the dinner plate 308 or the front armrest, and the foot shelf 309, etc. If no conflict occurs, for the connection relationship between these components of the seat 3, reference may be made to the description in the first embodiment, which will not be repeated here.

[0467] Referring to FIG. 55, the left and right sides of the seat 3 each are pivotally connected to the main frame 1 through the swing bracket assembly 2, so that the seat 3 can swing backwards and forwards relative to the main frame 1, and that the seat 3 has the swing mode. In some embodiments, the swing bracket assembly 2 is pivotally connected to the main frame 1, and the swing bracket assembly 2 is pivotally connected to the seat 3. The baby carrier also includes a seat retaining mechanism 39 (shown in FIG. 62) arranged between the main frame 1 and the seat 3. The seat 3 swings backwards and forwards relative to the main frame 1 by means of the swing bracket assembly 2, and the seat retaining mechanism 39 is configured to control the seat 3 to remain horizontal while the seat 3 is swinging backwards and forwards relative to the main frame 1, such that a baby seated in the seat 3 will not lean forward or backward along with the swing, thereby effectively avoiding the risk of the baby falling down from the seat 3. In addition, the seat 3 remaining horizontal during the swing can also effectively prevent items on the dinner plate 308 from falling down.

[0468] Referring to FIG. 56, in some embodiments, the main frame 1 has a first pivot portion 183, and is pivotally connected to the upper end of the swing bracket assembly 2 through the first pivot portion 183. In order to arrange the first pivot portion 183 conveniently, the main frame 1 may also include a fourth mounting housing 18, and the first pivot portion 183 is mounted on the fourth mounting housing 18. In some embodiments, the fourth mounting housing 18 is mounted, for example, on the support pipe 11 of the main frame 1. In some embodiments, according to the change of the structure of the main frame 1, the installation position of the fourth mounting housing 18 may also change.

[0469] Referring to FIG. 56, in some embodiments, the fourth mounting housing 18 may be formed by butting a seventh housing portion 181 and an eighth housing portion 182, for example, the seventh housing portion 181 and the eighth housing portion 182 are joined together then secured with screws 189. The seventh housing portion 181 is closer to the longitudinal center plane (or called the center plane of the left-right symmetry) of the baby carrier than the eighth housing portion 182. The eighth housing portion 182 has, for example, a fourth sleeve portion 180, and the fourth sleeve portion 180 fits over the end of the support pipe 11. In some embodiments, the fourth sleeve portion 180 and the support pipe 11 are fixedly connected, for example, by a fastener such as a screw. An operating button 184 is installed on the eighth housing portion 182, and configured to, for example, release a locking relationship between the support pipe 11 and the front foot support 101, so that the support pipe 11 can extend and retract relative to the front foot support 101 to adjust the height of the seat 3.

[0470] Referring to FIG. 57, in some embodiments, the first pivot portion 183 includes a mounting portion 1832 and a first pivoting ring 1833. The mounting portion 1832 is arranged on the fourth mounting housing 18, and the first pivoting ring 1833 is connected to the fourth mounting housing 18 by means of the mounting portion 1832. In some embodiments, the mounting portion 1832 is a column-shaped structure fixedly connected to the seventh housing portion 181 of the fourth m ounting housing 18 and protruding relative to the seventh housing portion 181. The mounting portion 1832 cannot rotate relative to the fourth mounting housing 18. The column-shaped mounting portion 1832 and the seventh housing portion 181 are integrally formed, or fixed together by screwing, riveting, or welding. The first pivoting ring 1833 fits over, but cannot rotate relative to, the column-shaped mounting portion 1832. The first pivoting ring 1833 is pivotally connected to the swing bracket assembly 2. It should be understood that the implementation of the first pivot portion 183 is not limited to the above examples. For example, in some embodiments, the mounting portion 1832 is a locking groove formed in the fourth mounting housing 18, and the locking groove has a groove opening formed on the seventh housing portion 181 and configured to allow the first pivoting ring 1833 to insert. The first pivoting ring 1833 fits over the mounting portion 1832 which is the locking groove through the groove opening in a non-rotatable manner. Alternatively, in some embodiments, the first pivot portion 183 is an integral member instead of being assembled by multiple parts, and in this case, the first pivot portion 183 and the seventh housing portion 181 are integrally formed.

[0471] Referring to FIG. 57, in some embodiments, at least one second guiding groove 18321 is formed on the outer peripheral wall of the column-shaped mounting portion 1832, and at least one projecting rib 18333 is arranged on the inner peripheral wall of the first pivoting ring 1833. When the first pivoting ring 1833 is mounted onto the column-shaped mounting portion 1832 along a mounting direction QI, the second guiding groove 18321 and the projecting rib 18333 engage in a manner of a concave-convex fit, and the engagement thereof guides the first pivoting ring 1833 to fit over the column-shaped mounting portion 1832 on one hand, and on the other hand, prevents a relative rotation between the first pivoting ring 1833 and the column-shaped mounting portion 1832. In some embodiments, the position of the projecting rib 18333 and the position of the second guiding groove

18321 may be interchanged.

[0472] Referring to FIG. 57, in some embodiments, at least one first elastic arm 18322 is arranged on the outer peripheral wall of the column-shaped mounting portion 1832, and the first elastic arm

18322 has a projecting finger 18323. A locking portion 18332 is formed on the inner peripheral wall of the first pivoting ring 1833, and the locking portion 18332 is, for example, a groove 18302 formed on the inner peripheral wall of the first pivoting ring 1833. When the first pivoting ring 1833 is installed onto the column-shaped mounting portion 1832 along the installation direction QI, after the locking portion 18332 passes over the projecting finger 18323, the projecting finger 18323 rebounds and abuts against the locking portion 18332, thereby effectively preventing the first pivoting ring 1833 from being separated from the column-shaped mounting portion 1832.

[0473] Referring to FIG. 58, in some embodiments, the swing bracket assembly 2 includes a swing housing 23. The swing housing 23 includes, for example a cover 2301 and a fence 2302 extending from an edge of the cover 2301. The opening 2303 surrounded and formed by the fence 2302 may be shielded by the safety fence 306 of the seat 3. The first pivot portion 183 is received inside the swing housing 23. More specifically, the cover 2301 has a mounting hole 230, and a first receiving portion 231 corresponding to the mounting hole 230 is formed inside the swing housing 23. The first pivoting ring 1833 is sleeved inside the first receiving portion 231, and the column-shaped mounting portion 1832 extends into the swing housing 23 through the mounting hole 230 to be sleeved inside the first pivoting ring 1833. When the seat 3 swings relative to the main frame 1, the swing housing 23 rotates relative to the axis of the first pivoting ring 1833.

[0474] Referring to FIG. 58, in some embodiments, the baby carrier further includes a first axial limiting mechanism 2311, and the first axial limiting mechanism 2311 is configured to restrict the axial movement of the first pivoting ring 1833 relative to the swing housing 23, thereby preventing the swing housing 23 from being separated from the fourth mounting housing 18 of the main frame 1.

[0475] Referring to FIG. 58 and FIG. 65, in some embodiments, the first axial limiting mechanism 2311 includes a limiting step 23111 and an elastic stopping block 23112 arranged on the wall of the first receiving portion 231. When the first pivoting ring 1833 engages with the first receiving portion 231 of the swing housing 23 along the installation direction Q2, the elastic stopping block 23112 elastically deforms to allow the first pivoting ring 1833 to be sleeved into the first receiving portion

231. When one end surface of the first pivoting ring 1833 abuts against the limiting step 23111, the elastic stopping block 23112 rebounds and abuts against the other end surface of the first pivoting ring 1833, forcing the first pivoting ring 1833 to be clamped between the limiting step 23111 and the elastic stopping block 23112.

[0476] Referring to FIG. 65, in some embodiments, a first guiding groove 18331 is formed on the outer peripheral wall of the first pivoting ring 1833, during the installation of the first pivoting ring 1833 and the swing housing 23, the elastic stopping block 23112 slidably engages with the first guiding groove 18331. The groove depth H3 of the first guiding groove 18331 gradually becomes larger along the installation direction Q2 of the first pivoting ring 1833, and/or, the width W of the first guiding groove 18331 gradually becomes larger along the installation direction of the first pivoting ring 1833. Such a design of the first guiding groove 18331 is beneficial to reduction of the installation difficulty of the swing housing 23 and the first pivoting ring 1833.

[0477] Referring to FIG. 59 and FIG. 60, a lower end of the swing bracket assembly 2 is pivotally connected to the safety fence 306 of the seat 3. In some embodiments, the second pivot portion 38 is arranged on the safety fence 306 of the seat 3, and the safety fence 306 of the seat 3 is pivotally connected to the lower end of the swing bracket assembly 2 through the second pivot portion 38, more specifically, is pivotally connected to the lower end of the swing housing 23. In some embodiments, the second pivot portion 38 includes a second pivoting ring 382. The second pivoting ring 382 is fixedly connected to the safety fence 306. In some embodiments, the second pivot portion 38 and the safety fence 306 are integrally formed or fixed together by screwing, riveting, or welding. The second pivoting ring 382 cannot rotate relative to the safety fence 306 of the seat 3.

[0478] Referring to FIG. 58 and FIG. 59, in some embodiments, the swing housing 23 has a second receiving portion 232. When an opening 2303 of the swing housing 23 is covered by the safety fence 306, the second pivoting ring 382 is sleeved in the second receiving portion 232 of the swing housing

232. When the seat 3 swings relative to the main frame 1, a relative rotation may occur between the second pivoting ring 382 and the swing housing 23.

[0479] Referring to FIG. 59 and FIG. 65, in some embodiments, the baby carrier further includes a second axial limiting mechanism 2312, and the second axial limiting mechanism 2312 is configured to restrict an axial m ovement of the swing housing 23 relative to the second pivoting ring 382, thereby avoid a separation of the swing housing 23 and the safety fence 306.

[0480] Referring to FIG. 59 and FIG. 65, in some embodiments, the second axial limiting mechanism 2312 includes a second elastic arm 23121 located in the second receiving portion 232. When the swing housing 23 is connected to the safety fence 306, the second elastic arm 23121 passes through an inner hole 3820 of the second pivoting ring 382, and then a projecting finger 231211 of the second elastic arm 23121 engages with the edge of the inner hole 3820, thus the swing housing 23 is connected to the safety fence 306. [0481] Referring to FIG. 61 and FIG. 62, the seat retaining mechanism 39 is installed on the swing housing 23 of the swing bracket assembly 2 and arranged between the main frame 1 and the seat 3. More specifically, the seat retaining mechanism 39 is connected between the first pivot portion 183 and the second pivot portion 38. The seat retaining mechanism 39 is configured such that when the seat 3 swings backwards and forwards relative to the main frame 1, the swing bracket assembly 2 swings around the first pivot portion 183 (more specifically, around the axis of the first pivoting ring 1833) for the first angle in one direction (shown in FIG. 69 and FIG. 71). Under the action of the seat retaining mechanism 39, the seat 3 swings around the second pivot portion 38 (more specifically, around the axis of the second pivoting ring 382) for the first angle in another opposite direction. Thus, the rotations of the seat 3 in two directions are offset, and the seat 3 remains horizontal in the process of swinging backwards and forwards relative to the main frame 1.

[0482] The seat 3 remains horizontal during the swing, which allows a larger swing range of the swing bracket assembly 2. For example, the maximum backward swing angle of the swing bracket assembly 2 relative to its starting position is not restricted within 20 degrees, for example, may be 25 degrees or greater than 25 degrees. Referring to FIG. 66, the starting position of the swing housing 23 of the swing bracket assembly 2 is substantially perpendicular to the ground. The maximum forward swing angle is not limited to within 20 degrees, for example, may be 25 degrees or greater than 25 degrees.

[0483] The seat retaining mechanism 39 may be implemented in many ways, as long as the effect that the seat 3 remains horizontal during the swing can be achieved. FIG. 62 shows an exemplary structure of the seat retaining mechanism 39. The seat retaining mechanism 39 includes a gear transmission system 391. The gear transmission system 391 is installed in the swing housing 23 and includes, for example, a driving gear 3911. The driving gear 3911 is installed on the support column 2309 (shown in FIG. 65), and the support column 2309 is connected to the cover 2301. The driving gear 3911 has a third tooth part 39111 and a fourth tooth part 39112. The first pivot portion 183 includes a first tooth portion 1831, and the first tooth portion 1831 is, for example, formed on part of the outer peripheral wall of the first pivoting ring 1833. The second pivot portion 38 includes a second tooth portion 381, and the second tooth portion 381 is, for example, formed on part of the outer peripheral wall of the second pivoting ring 382. The first tooth portion 1831 and the second tooth portion 381 each mesh with the driving gear 3911 of the gear transmission system 391. More specifically, the first tooth portion 1831 meshes with the third tooth part 39111 of the driving gear 3911, and the second tooth portion 381 meshes with the fourth tooth part 39112 of the driving gear 3911.

[0484] Mutual positional relationships of the first tooth portion 1831, the driving gear 3911, and the second tooth portion 381 will be illustrated by combining FIG. 66 to FIG. 71 when the seat 3 swings relative to the main frame 1, thereby illustrating the swing of the seat 3 relative to the main frame 1 in the form that the seat 3 remains horizontal.

[0485] Referring to FIG. 66 and FIG. 67, the seat 3 is at the lowest swing position, and the swing angle of the seat 3 is zero at this time. A sign O' in the figures denotes a pivoting center of the first pivoting ring 1833, and a sign O" denotes a pivoting center of the second pivoting ring 382. At this time, a line X connected between the pivoting center O' and the pivoting center O" is substantially perpendicular to the ground, and an included angle 8 is formed between the back 307 of the seat 3 and the line X.

[0486] Referring to FIG. 68 and FIG. 69, the seat 3 swings backward in the first direction T1 relative to the main frame 1, and at this time, an angle 0 is formed between the line X connected between the pivot center O' and the pivot center O", and a vertical line Z, where the vertical line Z is perpendicular to the ground. The angle 0 is a first angle for which the swing housing 23 swings around the pivot center O’ in a direction Y 1. The swing of the swing housing 23 drives the driving gear 3911 to rotate relative to the first pivoting ring 1833, then the rotation of the driving gear 3911 drives the second pivot portion 38 and the seat 3 to swing around the pivot center O" in a direction Y2 for the first angle. The direction Y2 is opposite to the direction Yl. At this time, an included angle (5+0) is formed between the back 307 of the seat 3 and the line X, that is, the angle 5 between the back 307 and the vertical line Z remains unchanged, that is, the seat 3 remains horizontal during the backward swing. [0487] Referring to FIG. 70 and FIG. 71, the seat 3 swings forwards in the second direction T2 relative to the main frame 1. At this time, an angle r| is formed between the line X connected between the pivot center O’ and the pivot center O", and the vertical line Z. The angle i] is a first angle for which the swing housing 23 swings around the pivot center O' in a direction Y3. The swing of the swing housing 23 drives the driving gear 3911 to rotate relative to the first pivoting ring 1833, then the rotation of the driving gear 3911 drives the second pivot portion 38 and the seat 3 to swing around the pivot center O" in a direction Y4 for the first angle. The direction Y4 is opposite to the direction Y3. At this time, an included angle 6-r| is formed between the back 307 of the seat 3 and the line X, that is, the included angle 5 between the back 307 and the vertical line Z remains unchanged, and the seat 3 remains horizontal during the forward swing.

[0488] It should be noted that although in the above embodiment, the gear transmission system 391 is described by taking one driving gear 3911 as an example, in some other embodiments, the gear transmission system 391 may further include two or more driving gears 3911. More specifically, the first tooth portion 1831 meshes with, for example, one driving gear 3911 of the gear transmission system 391, and the second tooth portion 381 meshes with, for example, another driving gear 3911 of the gear transmission system 391. The two driving gears 3911 may mesh with each other directly or indirectly, which can also achieve the effect of controlling the seat 3 to remain horizontal during the backward and forward swing relative to the main frame 1.

[0489] Referring to FIG. 62, FIG. 64 and FIG. 65, in some embodiments, the baby carrier further includes a first swing limiting mechanism 481. The first swing limiting mechanism 481 is configured to restrict the swing angle of the swing housing 23 relative to the main frame 1, thereby controlling the swing range of the seat 3 within a safe range, and achieving the riding safety and comfort of the seat 3 in the swing mode.

[0490] The first swing limiting mechanism 481 may be implemented in various ways. Referring to FIG. 62, in some embodiments, the first swing limiting mechanism 481 includes a first groove 4810 and a first stopping portion 4811. The first groove 4810 is formed on the outer peripheral wall of the first pivoting ring 1833, the first stopping portion 4811 is arranged on the wall of the first receiving portion 231, and the first stopping portion 4811 extends into the first groove 4810. When the swing housing 23 swings, the first stopping portion 4811 abuts against one of two end walls 48101 of the first groove 4810, thereby restricting the swing angle of the swing housing 23. In some embodiments, the position of the first groove 4810 and the position of the first stopping portion 4811 may be interchanged.

[0491] Referring to FIG. 59, FIG. 62 and FIG. 65, in some embodiments, the baby carrier further includes a second swing limiting mechanism 482. The second swing limiting mechanism 482 is configured to restrict the swing angle of the seat 3 relative to the swing housing 23 or relative to the main frame 1, thereby also playing a role in controlling the swing range of the seat 3 within the safe range.

[0492] The second swing limiting mechanism 482 may be implemented in various ways. Referring to FIG. 62, in some embodiments, the second swing limiting mechanism 482 includes a second groove 4820 and a second stopping portion 4821. The second groove 4820 is formed on the outer peripheral wall of the second pivoting ring 382, the second stopping portion 4821 is arranged on the wall of the second receiving portion 232, and the second stopping portion 4821 extends into the second groove 4820. When the swing housing 23 swings, the second stopping portion 4821 abuts against one of two end walls 48201 of the second groove 4820, thereby restricting the swing angle of the seat 3. In some embodiments, the position of the second groove 4820 and the position of the second stopping portion 4821 may be interchanged.

[0493] Referring to FIG. 62 to FIG. 65, in some embodiments, the baby carrier may be further provided with a fourth swing locking mechanism 483. The fourth swing locking mechanism 483 indirectly locks or releases the swing of the seat 3 by locking or releasing the swing of the swing housing 23, so that the seat 3 can be switched between the fixed mode and the swing mode. It should be understood that the seat 3 cannot swing relative to the main frame 1 when the seat 3 is in the fixed mode. The fourth swing locking mechanism 483 may be implemented in various manners. For example, in some embodiments, the fourth swing locking mechanism 483 includes a locking pin elastically extending from the seventh housing portion 181 of the fourth mounting housing 18, and a releasing member configured to control extension and retraction of the locking pin. A locking hole is formed in the safety fence 306 of the seat 3, and when the locking pin is inserted into the locking hole, the seat 3 is switched to the fixed mode. When the locking pin retracts from the locking hole, the seat is switched to the swing mode.

[0494] FIG. 62 to FIG. 65 show an exemplary embodiment of the fourth swing locking mechanism 483, and the fourth swing locking mechanism 483 locks the swing of the swing housing 23 by means of locking the driving gear 3911. More specifically, the fourth swing locking mechanism 483 is installed on the swing housing 23, and includes a fourth releasing member 4831 and a locking block 4832. When the baby carrier is in the fixed mode, the locking block 4832 is inserted into the limiting groove 3910 of the driving gear 3911, thus the driving gear 3911 is locked and cannot rotate, then none of the second pivot portion 38, the swing housing 23, or the seat 3 can swing. As can be seen from FIG. 64, the limiting groove 3910 is located between a third tooth part 39111 and a fourth tooth part 39112. The fourth releasing member 4831 is operatively connected to the locking block 4832, and the fourth releasing member 4831 may drive the locking block 4832 disengage from the limiting groove 3910 to switch the baby carrier from the fixed mode to the swing mode.

[0495] In some embodiments, the fourth releasing member 4831 may be directly or indirectly connected to the locking block 4832. Referring to FIG. 63 to FIG. 65, in some embodiments, the fourth swing locking mechanism 483 further includes a driving member 4833, and the locking block 4832 is installed on the driving member 4833. More specifically, the locking block 4832 and the driving member 4833 are integrally formed. The fourth releasing member 4831 drives the locking block 4832 through the driving member 4833. The fourth releasing member 4831 may be arranged at any suitable position according to requirements (for example, the requirement of space layout) by means of arranging the driving member 4833.

[0496] In some embodiments, the driving member 4833 slidably engages with the swing housing 23, and the fourth releasing member 4831 slidably engages with the swing housing 23. The sliding direction of the fourth releasing member 4831 and the sliding direction of the driving member 4833 intersect, which is conductive to a compact structure of the fourth swing locking mechanism 483. In some embodiments, the sliding direction of the fourth releasing member 4831 may be perpendicular to the sliding direction of the driving member 4833.

[0497] Referring to FIG. 64, in some embodiments, the swing housing 23 has a seventh elongated hole 233. The fourth releasing member 4831 has an operation portion 48311 and a third column 48312 extending from operation portion 48311. The third column 48312 slidably engages with the seventh elongated hole 233. When the baby carrier needs to be switched between the fixed mode and the swing mode, the user may operate the operating portion 48311 so that the third column 48312 slides along the seventh elongated hole 233, and that the fourth releasing member 4831 may move to the unlocking position (shown in FIG. 62, FIG. 66 to FIG. 71) or the locking position (shown in FIG. 63 and FIG. 72). It may be understood that, when the fourth releasing member 4831 is at the unlocking position, the locking block 4832 retracts from the limiting groove 3910 (shown in FIG. 62), and the seat 3 may swing backwards and forwards relative to the main frame 1; and when the fourth releasing member 4831 is at the locking position, the locking block 4832 is inserted into the limiting groove 3910 (shown in FIG. 63), and the seat 3 cannot swing backwards and forwards relative to the main frame 1.

[0498] Referring to FIG. 65, in some embodiments, the cover 2301 of the swing housing 23 is provided with a guiding structure 2308, and the driving member 4833 slidably engages with the guiding structure 2308. The driving member 4833 also has a receiving hole 48338, and the receiving hole 48338 slidably engages with the support column 2309. The driving member 4833 has a third connecting hole 48330, and the third connecting hole 48330 has a third sloping wall 483301. The third column 48312 enters the third connecting hole 48330 after passing through the seventh elongated hole 233. Referring to FIG. 62 and FIG. 63, when the fourth releasing member 4831 moves from the locking position to the unlocking position, the third column 48312 pushes the third sloping wall 483301 so that the driving member 4833 drives the locking block 4832 to disengage from the limiting groove 3910. In some embodiments, a cap screw is installed in the center hole (not marked in the figure) of the third column 48312, and a cap of the cap screw abuts against the driving member 4831, thereby preventing the fourth releasing member 4831 from being detached from the driving member 4833. In some embodiments, the fourth releasing member 4831 is also prevented from being detached from the driving member 4833 by means of any other limiting structure.

[0499] In some not shown embodiments, the third connecting hole 48330 is an elongated hole, and the third connecting hole 48330 is inclined relative to the seventh elongated hole 233. When the fourth releasing member 4831 slides between the unlocking position and the locking position, the third column 48312 directly drives the driving member 4833 to slide, so that the locking block 4832 is inserted into or disengages from the limiting groove 3910.

[0500] Referring to FIG. 62 and FIG. 63, in some embodiments, the third connecting hole 48330 is substantially triangle-shaped. One end of the third sloping wall 483301 has a third limiting portion 483302, and the third limiting portion 483302 is configured to engage with the third column 48312, so that the fourth releasing member 4831 remains at the unlocking position. Thus, the fourth releasing member 4831 is kept at the unlocking position by mean of a simple structure.

[0501] Referring to FIG. 62 and FIG. 63, in some embodiments, the fourth swing locking mechanism 483 further includes a fourth elastic element 4834, and the fourth elastic element 4834 is configured to drive the locking block 4832 to be inserted into the limiting groove 3910. The fourth elastic element 4834 is, for example, a spring installed between the driving member 4833 and the fence 2302 of the swing housing 23.

[0502] Referring to FIG. 65, elastic claws 2331 are further arranged in the hole wall of the seventh elongated hole 233. When the fourth releasing member 4831 moves to the locking position, the elastic claws 2331 may clamp the third column 48312, thereby keeping the fourth releasing member 4831 at the locking position.

[0503] Referring to FIG. 64 and FIG. 65, in some embodiments, the driving member 4833 includes a first side portion 48331 and a second side portion 48332, which are opposite to each other, and a third side portion 48333 connected between the first side portion 48331 and the second side portion 48332. The driving gear 3911 is located between the first side portion 48331 and the second side portion 48332. The first side portion 48331 and the second side portion 48332 each form a receiving hole 48338 slidably engaging with the support column 2309. The locking block 4832 is arranged on the third side portion 48333. In some embodiments, the locking block 4832 and the driving member 4833 are integrally formed, and a recess 48320 for receiving the fourth elastic element 4834 is formed inside the locking block 4832.

[0504] Seventh Embodiment

[0505] FIG. 73 and FIG. 74 illustratively show a structure of the baby carrier provided by the seventh embodiment of the present disclosure. The baby carrier provided in this embodiment is a modification of the sixth embodiment above. If no conflict occurs, for structures of the components in this embodiment and a connection relationship between these components, reference may be made to the description in the sixth embodiment. The differences between this embodiment and the sixth embodiment are the implementation of the seat retaining mechanism 39 and the implementation of the swing locking mechanism for locking the swing of the seat 3, and mainly described hereinafter. [0506] The seat retaining mechanism 39 is, for example, symmetrically arranged on two sides of the seat 3. Referring to FIG. 75 and FIG. 76, the seat retaining mechanism 39 includes a sliding pin 392 and a sliding groove 393. One of the sliding pin 392 and the sliding groove 393 is disposed on the main frame 1, and the other thereof is arranged on the seat 3. When the swing bracket assembly 2 swings relative to the main frame 1, the sliding pin 392 and the sliding groove 393 slidably engage to control the seat 3 to remain horizontal relative to the main frame 1 during the forward and backward swing.

[0507] Referring to the embodiments described above, in some embodiments, the main frame 1 includes fourth mounting housings 18 arranged symmetrically at the left and right sides. Referring to FIG. 75, a sliding pin 392 is arranged on each fourth mounting housing 18, and the sliding pin 392 is, for example, parallel to the swing axis of the seat 3, namely, the axis of the swing of the seat 3 relative to the main frame 1. In some embodiments, referring to FIG. 76, the seventh housing portion 181 of the fourth mounting housing 18 has a fourth through hole 1810, and the sliding pin 392 is configured to pass through the fourth through hole 1810. In some embodiments, in order to form a sufficient support for the sliding pin 392, an hollow column 1812 protruding outwards is arranged on the seventh housing portion 181, and a center hole of the hollow column 1812 is the fourth through hole 1810.

[0508] Referring to the embodiments described above, in some embodiments, the seat 3 includes safety fences 306 arranged symmetrically at the left and right sides. Referring to FIG. 75, the sliding groove 393 is formed in the safety fence 306, and the sliding groove 393 has a curved shape. The engagement between the curve-shaped groove and the sliding pin 392 not only does not affect the forward and backward swing of the seat 3 relative to the main frame 1, but also ensures that the seat 3 remains horizontal during the swing, thereby preventing the seat 3 from leaning forward or backward. Referring to FIG. 78, when the seat 3 is installed on the support frame 1, the end of the hollow column 1812 abuts against the safety fence 306 of the seat 3, so that the sliding pin 392 extending from the fourth through hole 1810 stretches into the sliding groove 393.

[0509] Although in the above embodiment, the sliding pin 392 is arranged on the fourth mounting housing 18 of the main frame 1, and the sliding groove 393 is formed in the safety fence 306 of the seat 3, in some embodiments, the position of the sliding pin 392 on the main frame 1 and the position of the sliding groove 393 on the seat 3 may be interchanged.

[0510] Referring to FIG. 75 and FIG. 77, the seat retaining mechanism 39 in this embodiment controls the seat 3 to remain horizontal during the swing by means of the sliding pin 392 engaging with the sliding groove 393, so that the gear transmission system 391 in the sixth embodiment is not necessarily provided. Correspondingly, the fourth swing locking mechanism 483 in the sixth embodiment above configured to lock the driving gear 3911 is not necessarily provided. The structure of the seat retaining mechanism 39 provided in this embodiment is simple and easy to implement. It should be noted that although FIG. 76 shows the first tooth portion 1831 of the first pivoting ring 1833 of the first pivot portion 183, and FIG. 80 shows the second tooth portion 381 of the second pivoting ring 382 of the second pivot portion 38, on the basis that no gear transmission system 391 is provided, there is no meshing relationship between the first tooth portion 1831 and the second tooth portion 381, therefore, in practical applications of this embodiment, the first tooth portion 1831 and the second tooth portion 381 may not be provided.

[0511] Referring to FIG. 75, in some embodiments, a locking hole 30 is formed in the sliding groove 393, and the locking hole 30, for example, is located in the middle of the sliding groove 393. In some embodiments, the locking hole 30 is, for example, a through hole or a blind hole. Referring to FIG. 78 and FIG. 79, the sliding pin 392 has a locking position and an unlocking position. When the sliding pin 392 is at the locking position shown in FIG. 79, the sliding pin 392 extends into the locking hole 30, and the swing of the seat 3 is locked. The seat 3, whose swing is locked, is not easy to rotate relative to the main frame 1. Referring to FIG. 78, when the sliding pin 392 is at the unlocking position, the sliding pin 392 retracts from the locking hole 30 but still slidably engages with the sliding groove 393, thereby unlocking the swing of the seat 3.

[0512] Referring to FIG. 80 to FIG. 82, in some implementations, the baby carrier further includes the fifth swing locking mechanism 6a. The fifth swing locking mechanism 6a is configured to control the extension and retraction of the sliding pin 392, thereby locking or unlocking the swing of the seat 3. In some embodiments, the fifth swing locking mechanism 6a includes a fifth releasing member 61a and a fifth elastic element 63a. The fifth releasing member 61a is configured to directly or indirectly drive the sliding pin 392 to retract from the locking hole 30, and the fifth elastic element 63a is configured to drive the sliding pin 392 to be inserted into the locking hole 30.

[0513] Referring to FIG. 82, in some embodiments, the fifth releasing member 61a is configured to move backwards and forwards relative to the fourth mounting housing 18 to switch to an unlocking position or a locking position. The seventh housing portion 181 and/or the eighth housing portion 182 is provided with a structure guiding the movement of the fifth releasing member 61a. When the fifth releasing member 61a is at the unlocking position, the sliding pin 392 retracts from the locking hole 30 to slidably engage with the sliding groove 393. When the fifth releasing member 61a is at the locking position, the sliding pin 392 extends into the locking hole 30. In some embodiments, when extending into the locking hole 30, the sliding pin 392, for example, keeps the seat 3 at the lowest position shown in FIG. 83. In some embodiments, a plurality of locking holes 30 are provided, thereby enabling the seat 3 to be locked at different heights.

[0514] Referring to FIG. 80 to FIG. 82, in some embodiments, a second annular flange 3923 is arranged on the middle of the sliding pin 392, and the second annular flange 3923 divides the sliding pin 392 into a first part 3921 and a second part 3922. The first part 3921 is configured to pass through the fourth through hole 1810 and extend outwards to be inserted into the locking hole 30. Amounting hole 1820 is formed in the eighth housing portion 182, and the second part 3922 is axially movable to be arranged in the mounting hole 1820. The fifth elastic element 63a is, for example, a spring which fits over the second part 3922. The fifth releasing member 61a has an eighth elongated hole 611a, and the eighth elongated hole 61 la is a straight-line-shaped hole or a curved hole. A second stopping boss 612a extending obliquely is formed on a hole wall of the eighth elongated hole 611a. The second annular flange 3923 is clamped between the second stopping boss 612a and the fifth elastic element 63a. When the fifth releasing member 61a moves to the unlocking position, the second stopping boss 612a pushes the second annular flange 3923 to move axially, so that the sliding pin 392 exits from the locking hole 30. When the fifth releasing member 61a moves to the locking position, the second stopping boss 612a provides an axial space, and the fifth elastic element 63a drives the sliding pin 392 to move to be inserted into the locking hole 30. The fifth releasing member 61a may control the axial extension and retraction of the sliding pin 392 by means of various structures, which are not limited to the above examples.

[0515] Referring to FIG. 82, in some embodiments, a locking protrusion 616a is further formed on the hole wall of the eighth elongated hole 611a. The locking protrusion 616a is configured to engage with the sliding pin 392 to securely keep the fifth releasing member 61a at the unlocking position. More specifically, when the fifth releasing member 61a moves to the unlocking position, and when the locking protrusion 616a passes over the sliding pin 392, the locking protrusion 616a engages with the sliding pin 392 to keep the fifth releasing member 61a at the unlocking position.

[0516] Referring to FIG. 82, in some embodiments, a shaft 1811, for example, is arranged on the fourth mounting housing 18. The fifth releasing member 61a has a hole 601, and the shaft 1811 is sleeved in the hole 601. The fifth releasing member 61a rotates around the shaft 1811 to be switched between the unlocking position and the locking position. In some embodiments, for the convenience of operating the fifth releasing member 61a, the fifth releasing member 61a is provided with a fifth push block 613a. In some embodiments, the shaft 1811 may not be provided, and the movement of the fifth releasing member 61a is guided by other structures.

[0517] FIG. 83 to FIG. 85 show a positional relationship between the sliding pin 392 and the sliding groove 393 when the seat 3 swings relative to the main frame 1, and a position change of the seat 3 during the swing.

[0518] Referring to FIG. 83, the seat 3 is located at the lowest swing position, and the swing angle of the seat 3 is zero at this moment. The sign O' shown in the figure denotes a pivot center of the first pivoting ring 1833, and the sign O" denotes a pivot center of the second pivoting ring 382. At this time, a line X connected between the pivot center O' and the pivot center O" is substantially perpendicular to the ground, and an included angle 8 is formed between the back 307 of the seat 3 and the line X.

[0519] Referring to FIG. 84, the seat 3 swings backwards relative to the main frame 1 in the first direction T 1. At this time, an angle 0 is formed between the line X, connected between the pivot center O’ and the pivot center O", and the vertical line Z, and the vertical line Z is perpendicular to the ground. The included angle 0 is the first angle for which the swing housing 23 swings around the pivot center O' in the direction Yl. While the seat 3 is moving backwards together with the swing housing 23, by means of the sliding pin 392 engaging with the sli ding groove 393, the seat 3 swings around the pivot center O" for the first angle in the direction Y2, and the direction Y2 is opposite to the direction Yl. At this time, an included angle 5+0 is formed between the back 307 of the seat 3 and the line X, that is, the included angle between the back 307 and the vertical line Z remains 5, namely, and the seat 3 remains horizontal during the backward swing.

[0520] Referring to FIG. 85, the seat 3 swings forwards relative to the main frame 1 in the second direction T2. At this time, an included angle r| is formed between the line X, connected between the pivot center O' and the pivot center O", and the vertical line Z. The included angle q is the first angle for which the swing housing 23 swings around the pivot center O' in the direction Y3. While the seat 3 is moving backwards together with the swing housing 23 by means of the sliding pin 392 engaging with the sliding groove 393, the seat 3 swings around the pivot center O" in the direction Y4 for the first angle, and the direction Y4 is opposite to the direction Y3. At this time, an included angle 8-q is formed between the back 307 of the seat 3 and the line X, that is, the included angle between the back 307 and the vertical line Z remains 5, and the seat 3 remains horizontal during the forward swing.

[0521] FIG. 86 to FIG. 92 show a modified embodiment of the baby carrier, which is a modification of the embodiment shown in FIG. 75 to FIG. 85. More specifically, the modified embodiment mainly modifies the structure of the swing bracket assembly 2. If no conflict occurs, for the structures of the components of the modified embodiment and the connection relationship between the components, reference may be made to the description above. The differences between the modified embodiment and the embodiment shown in FIG. 75 to FIG. 85 are mainly described hereinafter.

[0522] Referring to FIG. 86 and FIG. 87, in the modified embodiment, the seat retaining mechanism 39 further includes a first wrapping cable 2a, and the first wrapping cable 2a fits over the first pivoting ring 1833 and the second pivoting ring 382 in a tensioned manner. In the modified embodiment, the first tooth portion 1831 and the second tooth portion 381 are no longer arranged on the first pivoting ring 1833 and the second pivoting ring 382, respectively, and no first guiding groove 18331 is formed on the first pivoting ring 1833. In the modified embodiment, for the connection structure between the main frame 1 and the first pivoting ring 1833, reference may be made to the connection structure between the main frame 1 and the first pivoting ring 1833 shown in FIG. 75, which is not described repeatedly herein. Referring to FIG. 87, the first wrapping cable 2a is arranged in the swing housing 23 and connects the first pivoting ring 1833 and the second pivoting ring 382, thereby improving the situation of stresses exerted on the swing housing 23. The first wrapping cable 2a is, but not limited to, a steel wire rope.

[0523] Referring to FIG. 86, in some embodiments, a first annular groove 1833a is formed on the outer peripheral wall of the first pivoting ring 1833, and the first wrapping cable 2a is wound around the first annular groove 1833a. The first annular groove 1833a axially positions the first wrapping cable 2a, thereby preventing the first wrapping cable 2a from being detached from the first pivoting ring 1833 accidentally. A second annular groove 382a is formed on the outer peripheral wall of the second pivoting ring 382, and the first wrapping cable 2a is wound around the second annular groove 382a. The second annular groove 382 axially positions the first wrapping cable 2a, thereby preventing the first wrapping cable 2a from being detached from the second pivoting ring 382 accidentally. [0524] Referring to FIG. 86 and FIG. 88, in some embodiments, a first positioning mechanism 183a is arranged between the first wrapping cable 2a and the first pivoting ring 1833, and the first positioning mechanism 183a is configured to prevent a top of the first wrapping cable 2a from moving relative to the top of the first pivoting ring 1833. In some embodiments, the first positioning mechanism 183a is arranged at a position where the first wrapping cable 2a touches the top of the first annular groove 1833a. More specifically, the first positioning mechanism 183a includes, for example, a positioning groove 18301 formed in the first annular groove 1833a, and a clamping block 201 arranged on the first wrapping cable 2a. The clamping block 201a is locked into the positioning groove 18301. However, the first positioning mechanism 183a is not limited to such a structure. In some embodiments, the first positioning mechanism 183a includes, for example, a fastener that fixes the top of the first wrapping cable 2a and the top of the first pivoting ring 1833 together.

[0525] Referring to FIG. 86 and FIG. 88, in some embodiments, a second positioning mechanism 38a is arranged between the first wrapping cable 2a and the second pivoting ring 382. The second positioning mechanism 38a is configured to prevent the bottom of the first wrapping cable 2a from moving relative to the bottom of the second pivoting ring 382. In some embodiments, the second positioning mechanism 38a is arranged at a position where the first wrapping cable 2a touches the bottom of the second annular groove 382a. In some embodiments, the second positioning mechanism 38a includes, for example, a positioning groove 38201 formed in the second annular groove 382a, and a clamping block 202a arranged on the first wrapping cable 2a. The clamping block 202a is locked into the positioning groove 38201. However, the second positioning mechanism 38a is not limited to such a structure. In some embodiments, the second positioning mechanism 38a includes, for example, a fastener that fixes the bottom of the first wrapping cable 2a and the bottom of the second pivoting ring 382 together.

[0526] Referring to FIG. 90, the seat 3 is located at the lowest swing position, and the swing angle of the seat 3 is zero at this moment. Referring to FIG. 91, the seat 3 swings backwards relative to the main frame 1 in the first direction Tl. Referring to FIG. 92, the seat 3 swings forwards relative to the main frame 1 in the first direction Tl. In the modified embodiment, the first wrapping cable 2a is fixedly attached to the first annular groove 1833a by the first positioning mechanism 183a, and is fixedly attached to the second annular groove 382a by the second positioning mechanism 38a. When the seat 3 swings backwards and forwards relative to the main frame 1, the first wrapping cable 2a may also assist the seat 3 in remaining horizontal during the swing. Specifically, when the seat 3 swings backwards and forwards, under the action of the first wrapping cable 2a, the seat 3 rotates a certain angle relative to the swing housing 23 to compensate a rotation of the swing housing 23 relative to the main frame 1, thereby assisting the seat retaining mechanism 39 in ensuring that the seat 3 remains horizontal during the swing process. The seat retaining mechanism 39 includes, for example, the sliding pin 392 and the sliding groove 393 described above.

[0527] FIG. 93 to FIG. 99 show another modified embodiment of the baby carrier, which is a modification of the modified embodiment shown in FIG. 86 to FIG. 92. More specifically, in this other modified embodiment, the structure of the swing bracket assembly 2 mainly changes. If no conflict occurs, for the structures of the components in the other modified embodiment and the connection relationship between these components, reference may be made to the above description. The differences between the other modified embodiment and the modified embodiment shown in FIG. 86 to FIG. 92 are mainly described hereinafter.

[0528] Referring to FIG. 93 and FIG. 94, in the other modified embodiment, the seat retaining mechanism 39 includes an intermediate member 235, and the intermediate member 235 is located between the first receiving portion 231 and the second receiving portion 232. The seat retaining mechanism 39 further includes a second wrapping cable 2b and a third wrapping cable 2c. The second wrapping cable 2b fits over one position of the intermediate member 235 and over the first pivoting ring 1833, and the third wrapping cable 2c fits over another position of the intermediate member 235 and over the second pivoting ring 382. The second wrapping cable 2b is substantially parallel to the third wrapping cable 2c. In this modified embodiment, no first wrapping cable 2a directly connected to the first pivoting ring 1833 and directly connected to the second pivoting ring 382 is provided. The second wrapping cable 2b and the third wrapping cable 2c are, but not limited to, steel wire ropes. It should be understood that the second wrapping cable 2b and the third wrapping cable 2c may also improve the situation of the stresses exerted on the swing housing 23.

[0529] Referring to FIG. 95 and FIG. 96, in some embodiments, the intermediate member 235 may include a column 2351, and a wheel body 2352 fitting over the column 2351. The column 2351, for example, extends from the swing housing 23. The wheel body 2352, for example, is pivotally connected to the column 2351. The second wrapping cable 2b and the third wrapping cable 2c fit over different positions on the wheel body 2352, respectively.

[0530] Referring to FIG. 93 to FIG. 96, in some embodiments, a third annular groove 1833b is formed on the outer peripheral wall of the first pivoting ring 1833, and a fourth annular groove 23501 and a fifth annular groove 23502 are axially spaced and formed on the outer peripheral wall of the wheel body 2352 of the intermediate member 235. A sixth annular groove 382b is formed on the outer peripheral wall of the second pivoting ring 382. The second wrapping cable 2b is wound around the third annular groove 1833b and the fourth annular groove 23501, and the third wrapping cable 2c is wound around the fifth annular groove 23502 and the sixth annular groove 382b. The design of these annular grooves may prevent the second wrapping cable 2b and the third wrapping cable 2c from moving in the axial direction.

[0531] Referring to FIG. 93 and FIG. 95, in some embodiments, a third positioning mechanism 183b is arranged between the second wrapping cable 2b and the first pivoting ring 1833, and the third positioning mechanism 183b is configured to prevent the top of the second wrapping cable 2b from moving relative to the top of the first pivoting ring 1833. In some embodiments, the third positioning mechanism 183b is arranged at a position where the second wrapping cable 2b touches the top of the third annular groove 1833b. In some embodiments, the third positioning mechanism 183b includes, for example, a positioning groove 18303 formed in the third annular groove 1833b and a clamping block 203a arranged on the second wrapping cable 2b. The clamping block 203a is locked into the positioning groove 18303. However, the third positioning mechanism 183b is not limited to such a structure. In some embodiments, the third positioning mechanism 183b includes, for example, a fastener that fixes the top of the second wrapping cable 2b and the top of the first pivoting ring 1833 together.

[0532] Referring to FIG. 93 and FIG. 95, in some embodiments, a fourth positioning mechanism 235a is arranged between the second wrapping cable 2b and the intermediate member 235, and the fourth positioning mechanism 235a is configured to prevent the bottom of the second wrapping cable 2b from moving relative to the bottom of the intermediate member 235. In some embodiments, the fourth positioning mechanism 235a is arranged at a position where the second wrapping cable 2b touches the bottom of the fourth annular groove 23501. In some embodiments, the fourth positioning mechanism 235a includes, for example, a positioning groove 2352a formed in the fourth annular groove 23501 and a clamping block 204a arranged on the second wrapping cable 2b. The clamping block 204a is locked into the positioning groove 2352a. However, the fourth positioning mechanism 235a is not limited to such a structure. In some embodiments, the fourth positioning mechanism 235a includes, for example, a fastener that fixes the bottom of the second wrapping cable 2b and the bottom of the intermediate member 235 together.

[0533] Referring to FIG. 93 and FIG. 95, in some embodiments, a fifth positioning mechanism 235b is arranged between the third wrapping cable 2c and the intermediate member 235, and the fifth positioning mechanism 235b is configured to prevent the top of the third wrapping cable 2c from moving relative to the top of the intermediate member 235. In some embodiments, the fifth positioning mechanism 235b is arranged at a position, where the third wrapping cable 2c touches the top of the fifth annular groove 23502. In some embodiments, the fifth positioning mechanism 235b includes, for example, a positioning groove 2352b formed in the fifth annular groove 23502 and a clamping block 205a arranged on the third wrapping cable 2c. The clamping block 205a is locked into the positioning groove 2352b. However, the fifth positioning mechanism 235b is not limited to such a structure. In some embodiments, the fifth positioning mechanism 235b includes, for example, a fastener that fixes the top of the third wrapping cable 2c and the top of the intermediate member 235 together.

[0534] Referring to FIG. 93 and FIG. 95, in some embodiments, a sixth positioning mechanism 38b is arranged between the third wrapping cable 2c and the second pivoting ring 382, and the sixth positioning mechanism 38b is configured to prevent the bottom of the third wrapping cable 2c from moving relative to the bottom of the second pivoting ring 382. In some embodiments, the sixth positioning mechanism 38b is arranged at a position where the third wrapping cable 2c touches the bottom of the sixth annular groove 382b. In some embodiments, the sixth positioning mechanism 38b includes, for example, a positioning groove 38202 formed in the sixth annular groove 382b and a clamping block 206a arranged on the third wrapping cable 2c. The clamping block 206a is locked into the positioning groove 38202. However, the sixth positioning mechanism 38b is not limited to such a structure. In some embodiments, the sixth positioning mechanism 38b includes, for example, a fastener that fixes the bottom of the third wrapping cable 2c and the bottom of the second pivoting ring 382 together.

[0535] Referring to FIG. 97, the seat 3 is in a relative lower swing position. Referring to FIG. 98, the seat 3 swings backwards relative to the main frame 1 in the first direction Tl. Referring to FIG. 99, the seat 3 swings forwards relative to the main frame 1 in the second direction T2. In another modified embodiment, when the seat 3 swings backwards and forwards relative to the main frame 1, under the actions of the second wrapping cable 2b, of the intermediate member 235 and of the third wrapping cable 2c, the seat 3 rotate for a certain angle relative to the swing housing 23 to compensate for the rotation of the swing housing 23 relative to the main frame 1, thereby ensuring that the seat 3 remains horizontal during the swing.

[0536] Eighth Embodiment

[0537] FIG. 100 and FIG. 108 illustratively show a structure of the baby carrier provided by the eighth embodiment of the present disclosure. The baby carrier provided in this embodiment is a modification of the seventh embodiment above. If no conflict occurs, for the structures of the components and the connection relationship between these components in this embodiment, reference may be made to the description in the seventh embodiment above. The differences between this embodiment and the seventh embodiment include the connection structure for connecting the seat 3 and the swing bracket assembly 2 to the main frame 1, and the implementation of the swing locking mechanism for locking the swing of the seat 3, and these differences are mainly described hereinafter. [0538] Referring to FIG. 100 to FIG. 103, in this embodiment, the swing bracket assembly 2 and the sliding pin 392 are installed on the seat 3. FIG. 101 and FIG. 102 show an exemplary structure of the detachable connection of the swing bracket assembly 2 to the main frame 1. A first connecting member 107 is installed on the swing bracket assembly 2. The first connecting member 107 is pivotally connected to the swing bracket assembly 2, and detachably locked in the first pivot portion 183 of the fourth mounting housing 18 of the main frame 1. The seat 3, together with the swing bracket assembly 2, may be disassembled from the main frame 1.

[0539] Referring to FIG. 103 to FIG. 105, the swing bracket assembly 2 includes the swing housing 23, and for a pivot connection between the swing housing 23 and the seat 3, reference may be made to the description in the first embodiment. In this embodiment, a pivoting recess 10a is formed on the swing housing 23, and the pivoting recess 10a and the second receiving portion 232 are located on different sides of the swing housing 23. In this embodiment, the first receiving portion 231 of the foregoing embodiments may not be provided. The first connecting member 107 has a round table 1072, and the round table 1072 is sleeved in the pivoting recess 10a and is rotatable relative to the pivoting recess 10a. In some embodiments, the position of the round table 1072 on the first connecting member 107 and the position of the pivoting recess 10a on the swing housing 23 may be interchanged. In some embodiments, the pivoting recess 10a and the round table 1072 are fixed by a third axial limiting mechanism 108 which is configured to restrict an axial movement between the pivoting recess 10a and the round table 1072. In some embodiments, the third axial limiting mechanism 108 is, for example, a bolt or a rivet. The bolt or rivet may also serve as a pivot for both the swing housing 23 and the round table 1072. In the embodiment in which the seat 3, together with the swing bracket assembly 2, is removable from the main frame 1. The swing housing 23 remains on the seat 3 when the seat 3 is removed from the main frame 1, and the first connecting member 107 remains on the swing housing 23 under the action of the third axial limiting mechanism 108, thereby avoiding a loss of the first connecting member 107.

[0540] Referring to FIG. 101, the seventh housing portion 181 of the fourth mounting housing 18 includes a first clamping recess la. The first clamping recess la serves as the first pivot portion 183. Referring to FIG. 102, the first connecting member 107 includes a first locking platform 1071, and the first locking platform 1071 is adapted to be inserted into the first clamping recess la along the direction from top to bottom, so as to realize a connection of the swing housing 3 to the support frame 1. In some embodiments, the position of the first clamping recess la on the fourth mounting housing 18 and the position of the first locking platform 1071 on the first connecting member 107 may be interchanged.

[0541] Referring to FIG. 101 and FIG. 102, in some embodiments, a first engaging mechanism 178 is arranged between the first locking platform 1071 and the first clamping recess la and configured to prevent the first locking platform 1071 from being detached from the first clamping recess la easily. The first engaging mechanism 178 includes, for example, a boss 1782 and a recess 1781 which engage with each other, and the boss 1782 and the recess 1781 are formed on the first locking platform 1071 and the first clamping recess l , respectively.

[0542] Referring to FIG. 101 and FIG. 102, in some embodiments, a sliding pin 392 is installed on the second connecting member 208, and the second connecting member 208 is detachably connected to the fourth mounting housing 18, thus realizing a detachable connection of the sliding pin 392 to the main frame 1. More specifically, in some embodiments, the seventh housing portion 181 of the fourth mounting housing 18 includes a second clamping recess lb. The second connecting member 208 includes a second locking platform 2081, and the second locking platform 2081 is adapted to be inserted into the second clamping recess lb. In some embodiments, the position of the second clamping recess lb on the fourth mounting housing 18 and the position of the second locking platform 2081 on the second connecting member 208 may be interchanged.

[0543] Referring to FIG. 101 and FIG. 102, in some embodiments, a second engaging mechanism 278 is provided between the second locking platform 2081 and the second clamping recess lb, and configured to prevent the second locking platform 2081 from being detached from the second clamping recess lb easily. The second engaging mechanism 278 includes, for example, a boss 2782 and a recess 2781 which engage with each other, and the boss 2782 and the recess 2781 are formed on the second locking platform 2081 and the second clamping recess lb, respectively.

[0544] Referring to FIG. 103 and FIG. 108, in some embodiments, the sliding pin 392 is a bolt, and an end of the bolt is configured to pass through the second connecting member 208 and the sliding groove 393 to be connected to the nut 3925. In other embodiments, the sliding pin 392 is connected to the second connecting member 208 by interference fit, or is fixedly connected to the second connecting member 208 in other manners. In the embodiment in which the seat 3, together with the swing bracket assembly 2, is removable from the main frame 1, the sliding pin 392 and the second connecting member 208 remain connected to the main frame 1 after the seat 3 is removed from the main frame 1, thereby reducing the chance of loss of the sliding pin 392 and the second connecting member 208. In some embodiments, the second connecting member 208 further includes a protective sleeve 2082 connected to the second locking platform 2081, and the sliding pin 392 is configured to pass through the protective sleeve 2082. An end, away from the second locking platform 2081, of the protective sleeve 2082 abuts against the seat 3, so that a portion of the sliding pin 392 extending from the protective sleeve 2082 may be inserted into the sliding groove 393 at a close distance, which is conducive to improvement of the structure strength of the sliding pin 392.

[0545] Referring to FIG. 103, in this embodiment, the locking hole 30 on the seat 3 is located outside the sliding groove 393, and the swing of the seat 3 is locked by the locking pin 62 of the first swing locking mechanism 6, instead of by controlling the axial extension and retraction of the sliding pin 392.

[0546] In some embodiments, the structure of the first swing locking mechanism 6 is similar to the structure of the fifth swing locking mechanism 6a exemplified in the first embodiment. The first swing locking mechanism 6 is installed on the fourth mounting housing 18, and the swing of the seat 3 is locked or released by controlling the axial extension and retraction of the locking pin 62.

[0547] FIG. 103 to FIG. 107 show another embodiment of the first swing locking mechanism 6, which is, for example, mounted on the swing housing 23 of the swing bracket assembly 2. Specifically, the first swing locking mechanism 6 includes a first releasing member 61, a locking pin 62 and a first elastic element 63. The locking pin 62 is configured to extend or contract in a direction parallel to the swing axis, around which the seat 3 swings relative to the main frame 1, of the seat 3. The first elastic element 63 is configured to apply an elastic force to the locking pin 62, thus forcing the locking pin 62 to extend and be inserted into the locking hole 30. The first releasing member 61 is operatively connected to the locking pin 62 to push the locking pin 62 to retract from the locking hole 30. A moving direction of the first releasing member 61 is perpendicular to the extension and retraction direction of the locking pin 62.

[0548] Referring to FIG. 103 to FIG. 106, in some embodiments, the first releasing member 61 has a first connecting hole 6101, and the locking pin 62 has a first cylinder 6201. The first connecting hole 6101 has a first sloping wall 61011, and the first cylinder 6201 is configured to be inserted into the first connecting hole 6101. The first releasing member 61 has an unlocking position and a locking position, and a movement, between the unlocking position and the locking position, of the first releasing member 61 controls the extension and retraction of the locking pin 62. When the first releasing member 61 is at the locking position shown in FIG. 106, the locking pin 62 extends outwards and is inserted into the locking hole 30. When the first releasing member 61 moves from the locking position to the unlocking position along a direction of an arrow shown in FIG. 106, the first sloping wall 61011 abuts against the first cylinder 6201. The first cylinder 6201 is supported by the first sloping wall 61011 to drive the locking pin 62 to retract from the locking hole 30, so that the seat 3 may swing backwards and forwards relative to the main frame 1. In some embodiments, the position of the first connecting hole 6101 on the first releasing member 61 and the position of the first cylinder 6201 on the locking pin 62 may be interchanged.

[0549] Referring to FIG. 104 and FIG. 105, the swing housing 23 has a first sideway 2305 which slidably engages with the first releasing member 61, and a second sideway 2306 which slidably engages with the locking pin 62. The first sideway 2305 and the second sideway 2306 are perpendicular to each other. An inclined guiding wall 23061 is formed on the wall of the second sideway 2306, and the first cylinder 6201 is guided by the inclined guiding wall 23061 to enter the first connecting hole 6101.

[0550] Referring to FIG. 106, in some embodiments, one end of the first sloping wall 61011 has a first limiting portion 61012, and the first limiting portion 61012 is configured to engage with the first cylinder 6201 to keep the first releasing member 61 at the unlocking position, thereby keeping the locking pin 62 in a state of having been retracted from the locking hole 30.

[0551] Referring to FIG. 107, in some embodiments, the first elastic element 63 is a spring clamped between the swing housing 23 and the locking pin 62. The first releasing member 61 has an evading hole 6102 allowing the first elastic element 63 to pass through. It may be understood that when the first releasing member 61 moves from the unlocking position to the locking position, once the first cylinder 6201 is detached from the first limiting portion 61012 (shown in FIG. 106), the locking pin 62, driven by the first elastic element 63, automatically extends to be inserted into the locking hole 30. When the locking pin 62 is inserted into the locking hole 30, the swing housing 2 and the seat 3 cannot rotate relative to each other, so that the seat 3 cannot swing relative to the main frame 1, and that the swing of the seat 3 is locked.

[0552] In the embodiment shown in FIG. 102 to FIG. 107, although the first swing locking mechanism 6 is illustrated by taking the first swing locking mechanism 6 installed on the swing housing 23 of the swing bracket assembly 2 for an example, it should be understood that, in some embodiments, the first swing locking mechanism 6, for example, is installed on the fourth mounting housing 18 of the main frame 1.

[0553] Ninth Embodiment

[0554] FIG. 109 and FIG. 117 illustratively show the structure of the baby carrier provided by the ninth embodiment of the present disclosure. The baby carrier provided in this embodiment is a modification of the eighth embodiment above. If no conflict occurs, for the structures of the components and the connection relationship between the components in this embodiment, reference may be made to the description in the eighth embodiment. The difference between this embodiment and the eighth embodiment is the implementation of the first swing locking mechanism 6, and mainly described hereinafter.

[0555] Referring to FIG. Ill and FIG. 112, the first swing locking mechanism 6 includes the first releasing member 61, the locking pin 62, the first elastic element 63 and a mounting column 64. In this embodiment, the first swing locking mechanism 6 is illustrated by taking the first swing locking mechanism 6 installed on the swing housing 23 for an example. In some embodiments, the first swing locking mechanism 6 may be installed on the fourth mounting housing 18 of the main frame 1.

[0556] Referring to FIG. Il l, FIG. 112 and FIG. 114, the locking pin 62 fits over the mounting column 64, and is extendable and retractable in the direction parallel to the swing axis of the seat 3, namely, parallel to the axis around which the seat 3 swings relative to the main frame 1. The first elastic element 63 applies an elastic force to the locking pin 62, forcing the locking pin 62 to extend to be inserted into the locking hole 30. The first releasing member 61 is operatively connected to the locking pin 62, and the moving direction of the first releasing member 61 is perpendicular to the extension and retraction direction of the locking pin 62. Referring to FIG. 113, in some embodiments, the swing housing 23 has a groove structure 23071 for guiding the movement of the first releasing member 61, and the swing housing 23 also has an opening 2307a allowing the first push block 613 of the first releasing member 61 to extend outwards.

[0557] Referring to FIG. Ill to FIG. 114, in some embodiments, the locking pin 62 fits over the mounting column 64. When the locking pin 62 at the locking position is pushed by the first releasing member 61, the locking pin 62 moves axially while rotating around the mounting column 64, so that the locking pin 62 retracts from the locking hole 30. For example, a second connecting hole 6401 is formed in the outer peripheral wall of the mounting column 64, and the second connecting hole 6401 has a second sloping wall 64011. A second cylinder 6202 is arranged on the inner peripheral wall of the locking pin 62, and the second cylinder 6202 is configured to extend into the second connecting hole 6401, so that the locking pin 62 is kept to be connected to the mounting column 64. In some embodiments, the locking pin 62, for example, has an elastic arm 6222, and the second cylinder 6202 is arranged on the elastic arm 6222.

[0558] The first releasing member 61 has an unlocking position and a locking position, and the movement, between the unlocking position and the locking position, of the first releasing member 61 controls the extension and retraction of the locking pin 62 relative to the mounting column 64. When the first releasing member 61 is at the locking position shown in FIG. 117, the locking pin 62 is inserted into the locking hole 30, and the seat 3 cannot swing backwards and forwards. When the first releasing member 61 moves from the locking position to the unlocking position along the direction indicated by an arrow in FIG. 117, the first releasing member 61 drives the locking pin 62 to rotate relative to the mounting column 64, and at the same time, the second sloping wall 64011 abuts against the second cylinder 6202, and the second cylinder 6202 is pushed by the second sloping wall 64011 to drive the locking pin 62 to move axially and to retract from the locking hole 30, and the seat 3 can swing backwards and forwards relative to the main frame 1. In some embodiments, the position of the second connecting hole 6401 on the mounting column 64 and the position of the second cylinder 6202 on the locking pin 62 may be interchanged.

[0559] Referring to FIG. 113, in some embodiments, one end of the second sloping wall 64011 has a second limiting portion 64012, and the second limiting portion 64012 is configured to engage with the second cylinder 6202, so that the first releasing member 61 remains at the unlocking position, thereby keeping the locking pin 62 in a state of having retracted from the locking hole 30. The first elastic element 63 may be a spring clamped between the mounting column 64 and the locking pin 62. It may be understood that when the first releasing member 61 moves from the unlocking position to the locking position along the direction indicated by the arrow in FIG. 115, once the second cylinder 6202 is detached from the second limiting portion 64012, the locking pin 62, driven by the first elastic element 63, automatically extends to be inserted into the locking hole 30. When the locking pin 62 is inserted into the locking hole 30, the swing housing 2 and the seat 3 cannot rotate relative to each other, so that the seat 3 cannot swing relati ve to the main frame 1, and that the swing of the seat 3 is locked.

[0560] Referring FIG. Ill and FIG. 112, in some embodiments, the first releasing member 61 is connected to the locking pin 62 through a crank slider mechanism 605. The crank slider mechanism 605 includes a cylinder 6051 and an elongated groove 6052, which slidably engage. The cylinder 6051, for example, is arranged on a lug 625 of the locking pin 62, and the elongated groove 6052, for example, is arranged on an extended plate 615 of the first releasing member 61. The crank slider mechanism 605 converts a translational movement of the first releasing member 61 into a rotation of the locking pin 62. In some embodiments, the position of the cylinder 6051 on the locking pin 62 and the position of the elongated groove 6052 on the first releasing member 61 may be interchanged.

[0561] Referring to FIG. Ill, FIG. 113 and FIG. 116, a seventh positioning mechanism 635 is arranged between the swing housing 23 and the first releasing member 61, and the seventh positioning mechanism 635 is configured to keep the first releasing member 61 at the unlocking position or the locking position. In some embodiments, the seventh positioning mechanism 635 includes two rib plates 6351 and 6353 arranged on the first releasing member 61, and two clamping places 6352 and 6354 arranged on the swing housing 23. The two rib plates 6351 and 6353 extends from the extended plate 615 and are arranged at intervals in the moving direction of the first releasing member 61. Referring to FIG. 116, when the first releasing member 61 moves to the unlocking position, the rib plate 6351 crosses the clamping place 6352 and engages with the clamping place 6352, thereby keeping the first releasing member 61 at the unlocking position. Similarly, when the first releasing member 61 moves to the locking position, the rib plate 6353 crosses the clamping place 6354 and engages with the clamping place 6354, thereby keeping the first releasing member 61 at the locking position. The embodiments of the seventh positioning mechanism 635 are not limited to the above examples.

[0562] The technical features of the above embodiments may be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combinations of these technical features, these combinations should be considered to be within the range described in this specification.

[0563] The above embodiments are just some implementations of the present disclosure, and the descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various modifications and improvements may be made without departing from the concepts of the present disclosure, and these modifications and improvements are all withing the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A baby carrier, characterized by comprising: a main frame, configured to be supported by ground; a swing bracket assembly; and a seat, pivotally connected to the main frame through the swing bracket assembly.

2. The baby carrier according to claim 1, wherein: the swing bracket assembly comprises swing arms, and the swing arms each are pivotally connected with the main frame; and the baby carrier further comprises swing limiting mechanisms, and the swing limiting mechanisms each are arranged between each of the swing arms and the main frame.

3. The baby carrier according to claim 2, wherein: a pivot is disposed on each swing arm, and the swing arm is pivotally connected to the main frame through the pivot; and the swing limiting mechanism comprises: a fixing member, fixed on the main frame and having a first limiting surface and a second limiting surface; and an abutting member, connected to the pivot and disposed between the first limiting surface and the second limiting surface, wherein the abutting member limits a swing of the swing arm by abutting against the first limiting surface and the second limiting surface.

4. The baby carrier according to claim 3, wherein: the fixing member comprises a limiting groove; and the first limiting surface and the second limiting surface are formed on side walls of the limiting groove, or, a limiting member is provided inside the limiting groove and the first limiting surface and the second limiting surface are formed on the limiting member.

5. The baby carrier according to claim 4, wherein the limiting member comprises an opening allowing the pivot to pass through, and the first limiting surface and the second limiting surface are formed on a wall of the opening.

6. The baby carrier according to claim 4, wherein: the side walls of the limiting groove comprise a first side wall and a second side wall parallel to each other, the first limiting surface and the second limiting surface both are formed on the first side wall and both are formed on the second side wall; the abutting member is configured to be inserted into the limiting groove, and comprises a first parallel surface pair and a second parallel surface pair; when swinging to abut against the first limiting surfaces, the first parallel surface pair prevents the swing arm from continuing to swing in a first direction; and when swinging to abut against the second limiting surfaces, the second parallel surface pair prevents the swing arm from continuing to swing in a second direction which is opposite to the first direction.

7. The baby carrier according to claim 4, wherein: the main frame is provided with a support pipe, and the fixing member is sleeved inside the support pipe; the limiting groove is configured to extend longitudinally along the fixing member and has a groove opening; the abutting member is inserted from the groove opening into the limiting groove; and the support pipe has a first through hole; the fixing member has a second through hole; the pivot is configured to pass through the first through hole and the second through hole; and an axis of the support pipe is substantially perpendicular to an axis of the pivot.

8. The baby carrier according to claim 7, wherein: a first shaft sleeve fits over the pivot, and the first shaft sleeve is disposed on one side of the limiting groove and is installed in the second through hole; and/or, an end of the pivot comprises a first flat-head portion, the abutting member comprises a first flat hole for engaging with the first flat-head portion, a first limiting structure is provided on the first flathead portion, and the first limiting structure is configured to prevent the abutting member from being detached from the first flat-head portion.

9. The baby carrier according to claim 8, wherein: a first step is formed at a root of the first flat-head portion, and a first positioning recess is formed on the first flat-head portion; and the first limiting structure comprises a spring clip and a first positioning sleeve, which are located on another side of the limiting groove; the first positioning sleeve fits over the first flat-head portion and comprises a radial through slot for receiving the spring clip; the spring clip is configured to be inserted into the radial through slot and engage with the first positioning recess, so that the abutting member is clamped between the first step and the first positioning sleeve.

10. The baby carrier according to claim 9, wherein: a second flat hole is formed in the first positioning sleeve, and configured to engage with the first flat-head portion; and a positioning hole and a positioning column are respectively disposed on end surfaces, opposite to each other, of the abutting member and of the first positioning sleeve, and engage with each other.

11. The baby carrier according to claim 9, wherein: the pivot and the swing arm are integrally formed; and/or the first positioning sleeve is installed inside the second through hole; and/or axial guiding grooves and axial guiding ribs engaging with each other are disposed on an outer periphery of the first shaft sleeve and on a hole wall of the second through hole, respectively.

12. The baby carrier according to claim 1, wherein the baby carrier further comprises a first swing locking mechanism for locking a swing of the seat.

13. The baby carrier according to claim 12, wherein the first swing locking mechanism comprises a first releasing member, a locking pin and a first elastic element; the first elastic element is configured to exert an elastic force on the locking pin, forcing the locking pin to stretch outwards and to be inserted into a locking hole in the seat; and the first releasing member is operatively connected to the locking pin to push the locking pin to retract from the locking hole.

14. The baby carrier according to claim 13, wherein: a first annular flange is provided on a middle part of the locking pin, and the first annular flange divides the locking pin into a first part and a second part; the first part is configured to be inserted into the locking hole, and the first elastic element fits over the second part; the first releasing member has an unlocking position and a locking position; the first releasing member comprises a first elongated hole, and an obliquely-extending first stopping boss is formed on a hole wall of the first elongated hole; and the first annular flange is clamped between the first stopping boss and the first elastic element, and when the first releasing member is moving to the unlocking position, the first stopping boss pushes the first annular flange to drive the locking pin to retract.

15. The baby carrier according to claim 14, wherein: the main frame further comprises a first mounting housing; the first swing locking mechanism is installed inside the first mounting housing; the first mounting housing comprises a third through hole, and the locking pin is configured to stretch out from the third through hole; and the first releasing member is movable relative to the first mounting housing to be switched to the unlocking position or the locking position; the first releasing member comprises a first push block; and the first mounting housing comprises a first opening allowing the first push block to move through.

16. The baby carrier according to claim 12, wherein: the first swing locking mechanism is installed on the main frame or on the swing bracket assembly; the first swing locking mechanism comprises a first releasing member, a locking pin and a first elastic element; and a moving direction of the first releasing member is perpendicular to an extension and retraction direction of the locking pin.

17. The baby carrier according to claim 16, wherein: one of the first releasing member and the locking pin has a first connecting hole, and another of the first releasing member and the locking pin has a first cylinder; the first connecting hole has a first sloping wall, and the first cylinder is configured to be inserted into the first connecting hole; and the first releasing member has an unlocking position and a locking position; when the first releasing member is at the locking position, the locking pin is inserted into the locking hole; and when the first releasing member moves from the locking position to the unlocking position, the first sloping wall abuts against the first cylinder to drive the locking pin to retract from the locking hole.

18. The baby carrier according to claim 17, wherein, one end of the first sloping wall has a first limiting portion, and the first limiting portion is configured to engage with the first cylinder to keep the first releasing member at the unlocking position.

19. The baby carrier according to claim 17, wherein the swing bracket assembly comprises a swing housing; the first swing locking mechanism is installed on the swing housing; and the swing housing has a first sideway slidably engaging with the first releasing member, and a second sideway slidably engaging with the locking pin.

20. The baby carrier according to claim 19, wherein: the first connecting hole i s formed in the first releasing member, and the first cylinder is arranged on the locking pin; an inclined guiding wall is formed on a wall of the second sideway, and the first cylinder is guided by the inclined guiding wall to enter the first connecting hole.

21. The baby carrier according to claim 16, wherein: the first swing locking mechanism further comprises a mounting column, and the locking pin fits over and is rotatable relative to the mounting column; one of the mounting column and the locking pin has a second connecting hole, and another of the mounting column and the locking pin has a second cylinder; the second connecting hole has a second sloping wall; the second cylinder is configured to be inserted into the second connecting hole; and the first releasing member has an unlocking position and a locking position; when the first releasing member is at the locking position, the locking pin is inserted into the locking hole; when the first releasing member moves from the locking position to the unlocking position, the first releasing member drives the locking pin to rotate relative to the mounting column, and at the same time the second sloping wall abuts against the second cylinder to drive the locking pin to retract from the locking hole.

22. The baby carrier according to claim 21, wherein, one end of the second sloping wall has a second limiting portion, and the second limiting portion is configured to engage with the second cylinder to keep the first releasing member at the unlocking position.

23. The baby carrier according to claim 21, wherein, the swing bracket assembly comprises a swing housing, the first swing locking mechanism is installed on the swing housing, and the first releasing member is connected to the locking pin through a crank slider mechanism.

24. The baby carrier according to claim 23, wherein, a seventh positioning mechanism is arranged between the swing housing and the first releasing member, and the seventh positioning mechanism is configured to keep the first releasing member at the unlocking position or the locking position.

25. The baby carrier according to claim 5, wherein: the opening comprises a first hole portion, the first hole portion comprises a first wall and a second wall, and the first limiting surface and the second limiting surface both are formed on the first wall, and both are formed on the second wall; and the abutting member is a second flat-head portion formed on the pivot; the second flat-head portion is adjacent to a first end of the pivot and comprises a first plane and a second plane parallel to each other; the first plane and the second plane, during a swing of the swing arm, abut against the first limiting surface and the second limiting surface to restri ct a swinging angle of the swing arm .

26. The baby carrier according to claim 25, wherein: the opening further comprises a second hole portion communicating with the first hole portion; and a position of the limiting member inside the limiting groove is adjustable to allow at least part of the second flat-head portion to engage with the second hole portion to lock the swing of the swing arm.

27. The baby carrier according to claim 26, wherein, the first hole portion is formed by butting two sector-shaped sub-holes; two limiting portions are formed at a junction of the two sector-shaped sub-holes; and when the second flat-head portion engages with the second hole portion, the second flat-head portion has a portion clamped between the two limiting portions.

28. The baby carrier according to claim 26, wherein: the limiting groove has a groove opening and a groove bottom; one of the second hole portion and the first hole portion is adjacent to the groove bottom of the limiting groove, and another of the second hole portion and the first hole portion is adjacent to the groove opening of the limiting groove; a second elastic element is installed inside the limiting groove, and clamped between the groove bottom and the limiting member; and when a pressing force is applied to the limiting member, the limiting member overcomes an elastic force of the second elastic element and moves towards the groove bottom, and when the pressing force is withdrawn, the second elastic element drives the limiting member to move towards the groove opening, to enable the first hole portion and the second hole portion to selectively engage with the second flat-head portion.

29. The baby carrier according to claim 28, wherein: the main frame is provided with a support pipe, and the fixing member is sleeved inside the support pipe; the limiting groove is configured to extend along the fixing member longitudinally and has a groove opening; the limiting member is inserted from the groove opening into the limiting groove; and the support pipe has a first through hole; the fixing member has a second through hole; the pivot is configured to pass through the first through hole and the second through hole; and an axis of the support pipe is substantially perpendicular to an axis of the pivot.

30. The baby carrier according to claim 29, wherein: a second shaft sleeve fits over the pivot, and the second shaft sleeve is disposed on one side of the limiting groove and is arranged to pass through the second through hole; and/or the pivot and the swing arm are separate structures; a flat-head connecting portion is provided on and protrudes from an end surface of a second end of the pivot; a connecting piece is provided on the swing arm, and the connecting piece comprises a third flat hole engaging with the flat-head connecting portion; the pivot is provided with a second limiting structure; and the second limiting structure is configured to prevent the connecting piece, the pivot and the limiting member from being separated from each other.

31. The baby carrier according to claim 30, wherein: the pivot comprises a center hole, and a second step is formed at a root of the second flat-head portion, and a third step is formed at a root of the flat-head connecting portion; the second limiting structure comprises a bolt and a nut; a tail end of the bolt is inserted into the center hole from a second end of the pivot, and goes out of the center hole from a first end of the pivot to be screwed in the nut; the nut is disposed on another side of the limiting groove and located in the second through hole; and the connecting piece is clamped between the third step and a head of the bolt, and the limiting member is clamped between the second step and the nut.

32. The baby carrier according to claim 31, wherein the pivot further comprises a prism protruding from an end surface of the second flat-head portion, and the nut forms a second positioning recess engaging with the prism.

33. The baby carrier according to any one of claims 28 to 32, wherein the baby carrier further comprises a second swing locking mechanism, and the second swing locking mechanism is operatively connected to the limiting member.

34. The baby carrier according to claim 33, wherein: a clamping part is disposed on a top, proximate to the groove opening, of the limiting member; the second swing locking mechanism comprises a second releasing member and an engaging member; the engaging member fits over a rotation shaft parallel to the pivot; an engaging boss and an evading portion are arranged on an outer periphery of the engaging member; the second releasing member is configured to drive the engaging member to rotate; and when the engaging boss rotates to a position where the engaging boss abuts against the clamping part, the limiting member moves towards the groove bottom; and when the evading portion rotates to a position where the evading portion abuts against the top of the limiting member, the limiting member moves towards the groove opening.

35. The baby carrier according to claim 34, wherein the second swing locking mechanism further comprises a first linking member; the first linking member is connected between the engaging member and the second releasing member, and the second releasing member drives the engaging member to rotate through the first linking member.

36. The baby carrier according to claim 35, wherein: the first linking member has a curved shape, and one of a first end of the first linking member and the second releasing member is provided with a first connecting pin, and another of the first end of the first linking member and the second releasing member has a second elongated hole slidably engaging with the first connecting pin; and a connecting lug is arranged on the engaging member; one of a second end of the first linking member and the connecting lug is provided with a second connecting pin, and another of the second end of the first linking member and the connecting lug has a third elongated hole slidably engaging with the second connecting pin.

37. The baby carrier according to claim 34, wherein: the main frame further comprises a second mounting housing, and the second swing locking mechanism and the rotation shaft are installed in the second mounting housing; the second releasing member comprises a second push block, and the second mounting housing comprises a third opening allowing the second push block to move; and the fixing member is located inside the second mounting housing, and the second mounting housing comprises a fourth opening allowing the swing arm to pass through.

38. The baby carrier according to claim 4, wherein an extension direction of the limiting groove is parallel to an axial direction of the pivot, and the pivot is arranged to pass through the limiting groove.

39. The baby carrier according to claim 38, wherein: the limiting member comprises a first region and a second region; the first region has the first limiting surface and the second limiting surface; the second region is adapted to engage with the abutting member to lock the swing arm; and the limiting member slidably engages with the limiting groove and has a first position and a second position; when the limiting member is at the first position, the first region engages with the abutting member; and when the limiting member is at the second position, the second region engages with the abutting member.

40. The baby carrier according to claim 39, wherein the limiting member comprises a force receiving plate and at least one arm extending from the force receiving plate, and the first region and the second region are formed on the at least one arm.

41. The baby carrier according to claim 40, wherein: the abutting member is provided with at least one first groove portion, each first groove portion comprises a first end wall and a second end wall opposite to each other; and the at least one arm is adapted to pass through the at least one first groove portion; when the first end walls swing to abut against respective first limiting surfaces, the swing arm is prevented from continuing to swing in a first direction; and when the second end walls swing to abut against respective second limiting surfaces, the swing arm is prevented from continuing to swing in a second direction.

42. The baby carrier according to claim 41, wherein the abutting member is further provided with at least one second groove portion, and the at least one second groove portion is adapted to engage with a corresponding second region.

43. The baby carrier according to claim 42, wherein: the at least one second groove portion is formed at a groove bottom of the at least one first groove portion; and a first clamping block is arranged on the second region of the at least one arm; and the first clamping block is adapted to engage with a corresponding second groove portion.

44. The baby carrier according to claim 42, wherein: the at least one first groove portion and the at least one second groove portion coincide with each other; and the second region of the at least one arm comprises a second clamping block; and the second clamping block is adapted to engage with a corresponding first groove portion.

45. The baby carrier according to claim 40, wherein: the limiting groove has a groove opening and a groove bottom; the force receiving plate is adjacent to the groove bottom, and the abutting member is adjacent to the groove opening; a third elastic element is provided in the limiting groove, and configured to apply a driving force to the force receiving plate to force the force receiving plate to move towards the groove bottom; and the baby carrier further comprises a third swing locking mechanism; and the third swing locking mechanism is operatively connected to the force receiving plate to drive the limiting member to be switched between the first position and the second position.

46. The baby carrier according to claim 45, wherein: the third swing locking mechanism comprises a driving wheel fitting over the pivot and abutting against a side, facing the groove bottom, of the force receiving plate; and one of a wall of the limiting groove and the dri ving wheel is provided with ratchet portions, and another of the wall of the limiting groove and the driving wheel is provided with a ratchet groove part; the ratchet groove part comprises a first ratchet groove having a first groove depth and a second ratchet groove having a second groove depth, which are sequentially arranged circumferentially; the first groove depth is not equal to the second groove depth; and the driving wheel moves axially and rotates circumferentially when receiving a pressing force, and the ratchet portion engages with the first ratchet groove and the second ratchet groove in sequence.

47. The baby carrier according to claim 46, wherein: a mounting hole is formed in the groove bottom of the limiting groove; and the third swing locking mechanism further comprises a press member; the press member has a pressing portion, and a pushing portion extending from the pressing portion; and the pushing portion extends into the limiting groove through the mounting hole; and the pushing portion is configured to apply the pressing force to a bevel of the first ratchet groove or to a bevel of the second ratchet groove.

48. The baby carrier according to claim 47, wherein: the third swing locking mechanism further comprises a restoring spring, and the restoring spring is configured to drive the press member to reset; and/or the pushing portion comprises at least one pushing arm extending from the pressing portion; a pushing step is formed in a middle of each pushing arm, and a hook is formed at each end of the pushing arm; the driving wheel is located between the pushing step and the hook; and the pushing step is configured to apply the pressing force, and the hook is configured to hook the driving wheel after the pressing force is withdrawn.

49. The baby carrier according to claim 46, wherein the ratchet portions are formed on the wall of the limiting groove, and the ratchet groove part is formed on the driving wheel.

50. The baby carrier according to claim 38, wherein the wall of the limiting groove has a first axial guiding portion, and the first axial guiding portion is configured to guide the limiting member to move axially.

51. The baby carrier according to claim 38, wherein the main frame is provided with a support pipe, and the support pipe has a first through hole; an axis of the first through hole is perpendicular to an axis of the support pipe; the fixing member is sleeved inside the first through hole; and a second axial guiding portion is formed on a hole wall of the first through hole, and configured to guide an axial movement of the fixing member during installation.

52. The baby carrier according to claim 2 or 38, wherein the swing bracket assembly further comprises an auxiliary swing arm, and the auxiliary swing arm is configured to assist the swing arm in supporting the seat.

53. The baby carrier according to claim 52, wherein the swing bracket assembly further comprises a connector; the swing arm and the auxiliary swing arm each are pivotally connected to the connector; and a locking portion is provided on the connector and configured to engage with the seat.

54. The baby carrier according to claim 38, wherein: the main frame further comprises a third mounting housing, and the fixing member is located inside the third mounting housing; and a limiting recess is formed on an outer side of the third mounting housing; the limiting recess has a first limiting wall and a second limiting wall, and the swing arm is configured to swing between the first limiting wall and the second limiting wall.

55. The baby carrier according to claim 1, wherein: the swing bracket assembly is pivotally connected to the main frame; the seat is pivotally connected to the swing bracket assembly; the seat is configured to swing relative to the main frame by means of the swing bracket assembly; and the baby carrier further comprises a seat retaining mechanism arranged between the main frame and the seat; and the seat retaining mechanism is configured to control the seat to remain horizontal during a swing.

56. The baby carrier according to claim 55, wherein: the main frame has a first pivot portion, and the seat has a second pivot portion; the first pivot portion and the second pivot portion each are pivotally connected to the swing bracket assembly; and when the swing bracket assembly swings around the first pivot portion for a first angle in one direction, the seat, under an action of the seat retaining mechanism, swings around the second pivot portion for the first angle in another opposite direction.

57. The baby carrier according to claim 56, wherein the swing bracket assembly comprises a swing housing, and the first pivot portion and the second pivot portion each are pivotally connected to the swing housing.

58. The baby carrier according to claim 57, wherein the seat retaining mechanism is mounted on the swing bracket assembly and connected between the first pivot portion and the second pivot portion.

59. The baby carrier according to claim 58, wherein the first pivot portion comprises a first tooth portion, and the second pivot portion comprises a second tooth portion; the seat retaining mechanism comprises a gear transmission system; and the first tooth portion and the second tooth each mesh with the gear transmission system.

60. The baby carrier according to claim 57, wherein: the main frame comprises a fourth mounting housing, and the swing housing has a first receiving portion; and the first pivot portion comprises a mounting portion and a first pivoting ring; the mounting portion is arranged inside the fourth mounting housing, and the mounting portion is sleeved inside the first pivoting ring, and the mounting portion and the first pivoting ring are un-rotatable relative to each other; and the first pivoting ring is sleeved inside the first receiving portion.

61. The baby carrier according to claim 60, wherein a first tooth portion is formed on at least part of an outer peripheral wall of the first pivoting ring; the second pivot portion 38 comprises a second tooth portion; and the first tooth portion meshes with the second tooth portion through a gear transmission system.

62. The baby carrier according to claim 57, wherein: the swing housing has a first receiving portion, and the first pivot portion comprises a first pivoting ring sleeved inside the first receiving portion; and the baby carrier further comprises a first axial limiting mechanism, and the first axial limiting mechanism is configured to limit an axial movement of the first pivoting ring relative to the swing housing.

63. The baby carrier according to claim 62, wherein, the first axial limiting mechanism comprises a limiting step and an elastic stopping block formed on a wall of the first receiving portion, and the first pivoting ring is clamped between the limiting step and the elastic stopping block.

64. The baby carrier according to claim 63, wherein a first guiding groove is formed on an outer peripheral wall of the first pivoting ring, and during an installation of the first pivoting ring and the swing housing, the elastic stopping block slidably engages with the first guiding groove; and a groove depth and/or a width of the first guiding groove gradually becomes larger along an installation direction of the first pivoting ring.

65. The baby carrier according to claim 57, further comprising a first swing limiting mechanism, and the first swing limiting mechanism is configured to restrict a swing angle of the swing housing relative to the main frame.

66. The baby carrier according to claim 65, wherein, the swing housing has a first receiving portion, and the first pivot portion comprises a first pivoting ring sleeved inside the first receiving portion; and the first swing limiting mechanism comprises a first groove and a first stopping portion; the first groove is formed on one of a wall of the first receiving portion and an outer peripheral wall of the first pivoting ring; the first stopping portion is arranged on another of the wall of the first receiving portion and the outer peripheral wall of the first pivoting ring, and the first stopping portion is configured to extend into the first groove; and when the swing housing swings, the first stopping portion abuts against one of two end walls of the first groove selectively.

67. The baby carrier according to claim 60, wherein: the mounting portion is column-shaped, and a projecting rib and a second guiding groove, engaging in a manner of a concave-convex fit, are provided between the mounting portion and the first pivoting ring; and/or the mounting portion is column-shaped, a first elastic arm is arranged on an outer peripheral wall of the mounting portion, and the first elastic arm has a projecting finger; a locking portion is formed on an inner peripheral wall of the first pivoting ring, and the locking portion is configured to abut against the projecting finger to prevent the first pivoting ring from being detached from the mounting portion.

68. The baby carrier according to claim 57, wherein: the swing housing has a second receiving portion; and the second pivot portion comprises a second pivoting ring, and the second pivoting ring is fixedly connected to the seat; and the second pivoting ring is sleeved inside the second receiving portion.

69. The baby carrier according to claim 68, wherein the second tooth portion is formed on at least part of an outer peripheral wall of the second pivoting ring; the first pivot portion comprises a first tooth portion, and the second tooth portion, meshes with the first tooth portion through a gear transmission system.

70. The baby carrier according to claim 68, further comprising a second axial limiting mechanism, wherein the second axial limiting mechanism is configured to restrict an axial movement of the swing housing relative to the second pivoting ring.

71. The baby carrier according to claim 70, wherein the second axial limiting mechanism comprises a second elastic arm located in the second receiving portion, and the second elastic arm is configured to pass through an inner hole of the second pivoting ring to engage with an edge of the inner hole.

72. The baby carrier according to claim 57, further comprising a second swing limiting mechanism, and the second swing limiting mechanism is configured to restrict a swing angle of the seat relative to the swing housing.

73. The baby carrier according to claim 72, wherein, the swing housing has a second receiving portion, and the second pivot portion comprises a second pivoting ring sleeved inside the second receiving portion; and the second swing limiting mechanism comprises a second groove and a second stopping portion; the second groove is provided on one of a wall of the second receiving portion and an outer peripheral wall of the second pivoting ring; the second stopping portion is provided on another of the wall of the second receiving portion and the outer peripheral wall of the second pivoting ring; the second stopping portion is configured to extend into the second groove; and when the swing housing swings, the second stopping portion abuts against one of two end walls of the second groove selectively.

74. The baby carrier according to claim 57, further comprising a fourth swing locking mechanism for locking or releasing a swing of the seat.

75. The baby carrier according to claim 74, wherein: the first pivot portion comprises a first tooth portion, and the second pivot portion comprises a second tooth portion; the seat retaining mechanism comprises a gear transmission system; the first tooth portion and the second tooth portion each mesh with the gear transmission system; the gear transmission system comprises a driving gear, and a limiting groove is formed on the driving gear; and the fourth swing locking mechanism is installed on the swing housing and comprises a fourth releasing member and a locking block; the locking block is adapted to be inserted into the limiting groove; and the fourth releasing member is operatively connected to the locking block to drive the locking block to be detached from the limiting groove.

76. The baby carrier according to claim 75, wherein the fourth swing locking mechanism further comprises a driving member; the locking block is installed on the driving member; and the fourth releasing member is configured to drive the locking block via the driving member.

77. The baby carrier according to claim 76, wherein the fourth releasing member slidably engages with the swing housing; the driving member slidably engages with the swing housing; and a sliding direction of the fourth releasing member and a sliding direction of the driving member intersect.

78. The baby carrier according to claim 76, wherein: the driving member has a third connecting hole, and the third connecting hole has a third sloping wall; the swing housing has a seventh elongated hole; the fourth releasing member has an operating portion and a third column extending from the operating portion; the third column is configured to enter the third connecting hole through the seventh elongated hole; and when the fourth releasing member moves from a locking position to an unlocking position, the third column pushes the third sloping wall to enable the driving member to drive the locking block to be detached from the limiting groove.

79. The baby carrier according to claim 78, wherein: one end of the third sloping wall has a third limiting portion, and the third limiting portion is configured to engage with the third column to keep the fourth releasing member in the unlocking position; and/or elastic claws are provided in a hole wall of the seventh elongated hole; and when the fourth releasing member moves to the locking position, the elastic claws clamp the third column to keep the fourth releasing member at the locking position.

80. The baby carrier according to claim 76, wherein: the driving member comprise a first side portion and a second side portion opposite to each other, and a third side portion connected between the first side portion and the second side portion; and the driving gear is located between the first side portion and the second side portion, and the locking block is arranged on the third side portion.

81. The baby carrier according to claim 75, wherein the fourth swing locking mechanism further comprises a fourth elastic element, and the fourth elastic element is configured to drive the locking block to be inserted into the limiting groove.

82. The baby carrier according to claim 75, wherein the driving gear comprises a third tooth part meshing with the first tooth portion and a fourth tooth part meshing with the second tooth portion, and the limiting groove is located between the third tooth part and the fourth tooth part.

83. The baby carrier according to claim 57, wherein: the first pivot portion comprises a first pivoting ring provided inside the swing housing, and the second pivot portion comprises a second pivoting ring provided in the swing housing; and the seat retaining mechanism comprises a first wrapping cable, and the first wrapping cable fits over the first pivoting ring and the second pivoting ring.

84. The baby carrier according to claim 83, wherein: a first annular groove is formed on an outer peripheral wall of the first pivoting ring, the first wrapping cable is wound around the first annular groove, and a first positioning mechanism is arranged between the first wrapping cable and the first pivoting ring; and/or a second annular groove is formed on an outer peripheral wall of the second pivoting ring, and the first wrapping cable is wound around the second annular groove, and a second positioning mechanism is arranged between the first wrapping cable and the second pivoting ring.

85. The baby carrier according to claim 57, wherein: the seat retaining mechanism comprises an intermediate member arranged on the swing housing; the first pivot portion comprises a first pivoting ring provided inside the swing housing; the second pivot portion comprises a second pivoting ring provided inside the swing housing; and the seat retaining mechanism further comprises a second wrapping cable and a third wrapping cable; the second wrapping cable fits over one position of the intermediate member and over the first pivoting ring, and the third wrapping cable fits over another position of the intermediate member and over the second pivoting ring.

86. The baby carrier according to claim 85, wherein, a third annular groove is formed on an outer peripheral wall of the first pivoting ring, and a fourth annular groove and a fifth annular groove are axially spaced and formed on an outer peripheral wall of the intermediate member, and a sixth annular groove is formed on an outer peripheral wall of the second pivoting ring; and the second wrapping cable is wound around the third annular groove and the fourth annular groove, and the third wrapping cable is wound around the fifth annular groove and the sixth annular groove.

87. The baby carrier according to claim 86, wherein: a third positioning mechanism is provided between the second wrapping cable and the first pivoting ring, and a fourth positioning mechanism is arranged between the second wrapping cable and the intermediate member; a sixth positioning mechanism is provided between the third wrapping cable and the sixth annular groove; and preferably, a fifth positioning mechanism is arranged between the third wrapping cable and the fifth annular groove.

88. The baby carrier according to claim 55, wherein the seat retaining mechanism comprises: a sliding pin, disposed on one of the main frame and the seat; and a sliding groove, disposed on another of the main frame and the seat; wherein when the swing bracket assembly swings relative to the main frame, the sliding pin and the sliding groove slidably engage with each other and control the seat to remain horizontal during a swing.

89. The baby carrier according to claim 88, wherein the sliding pin is parallel to a swing axis of the seat, and/or the sliding groove is a curved groove.

90. The baby carrier according to claim 88, wherein: a locking hole is formed in the sliding groove; and the sliding pin has a locking position at which the sliding pin extends into the locking hole, and has an unlocking position at which the sliding pin retracts from the locking hole; when the sliding pin is at the locking position, the swing of the seat is locked; and when the sliding pin is at the unlocking position, the swing of the seat is released.

91. The baby carrier according to claim 90, further comprising a fifth swing locking mechanism, and the fifth swing locking mechanism is configured to control an extension and retraction of the sliding pin to lock or release the swing of the seat.

92. The baby carrier according to claim 91, wherein, the fifth swing locking mechanism comprises a fifth releasing member and a fifth elastic element; the fifth releasing member is configured to drive the sliding pin to retract from the locking hole; and the fifth elastic element is configured to drive the sliding pin to be inserted into the locking hole.

93. The baby carrier according to claim 92, wherein: a second annular flange is arranged in a middle of the sliding pin; the second annular flange divides the sliding pin into a first part and a second part; the first part is configured to be inserted into the locking hole; the fifth elastic element fits over the second part; and the fifth releasing member has an eighth elongated hole; a second stopping boss extending obliquely is formed on a hole wall of the eighth elongated hole; and the second annular flange is clamped between the second stopping boss and the fifth elastic element.

94. The baby carrier according to claim 93, wherein a locking protrusion is further formed on the hole wall of the eighth elongated hole, and the locking protrusion is configured to engage with the sliding pin to keep the fifth releasing member at the unlocking position.

95. The baby carrier according to claim 55, wherein: the main frame comprises a fourth mounting housing; a first connecting member is installed on the swing bracket assembly, and pivotally connected to the swing bracket assembly; and the first connecting member is configured to be locked in the fourth mounting housing.

96. The baby carrier according to claim 95, wherein: the fourth mounting housing comprises a first clamping recess; and the first connecting member comprises a first locking platform; the first locking platform is adapted to be inserted into the first clamping recess; and a first engaging mechanism is arranged between the first locking platform and the first clamping recess.

97. The baby carrier according to claim 55, wherein, the main frame comprises a fourth mounting housing; the seat retaining mechanism comprises a sliding pin and a sliding groove; the sliding pin is installed on a second connecting member; the second connecting member engages with the fourth mounting housing; the sliding groove is formed on the seat, and the sliding pin is arranged to pass through the sliding groove; and when the swing bracket assembly swings relative to the main frame, the sliding pin and the sliding groove slidably engage to control the seat to remain horizontal during a swing.

98. The baby carrier according to claim 97, wherein, the fourth mounting housing comprises a second clamping recess; and the second connecting member comprises a second locking platform; the second locking platform is adapted to be inserted into the second clamping recess; and a second engaging mechanism is provided between the second locking platform and the second clamping recess.

99. The baby carrier according to claim 97, wherein the sliding pin is a bolt, and a tail end of the bolt is configured to pass through the second connecting member and the sliding groove and to be connected to a nut.

100. A swing mechanism, characterized by comprising: a fixing member, having a first limiting surface and a second limiting surface; a swing arm, having a pivot pivotable relative to the fixing member; and an abutting member, connected to the pivot and provided between the first limiting surface and the second limiting surface, wherein the abutting member restricts a swing angle of the swing arm by abutting against the first limiting surface and the second limiting surface.

101. The swing mechanism according to claim 100, wherein: the fixing member comprises a limiting groove; and the first limiting surface and the second limiting surface are formed on a side wall of the limiting groove; or a limiting member is provided in the limiting groove, and the first limiting surface and the second limiting surface are formed on the limiting member.

102. The swing mechanism according to claim 101, wherein, an extension direction of the limiting groove is perpendicular to an axial direction of the pivot, and the limiting groove has a groove opening; a side wall of the limiting groove compri ses a first side wall and a second side wall parallel to each other, and the first limiting surface and the second limiting surface both are formed on the first side wall, and both are formed on the second side wall; the abutting member is configured to be inserted into the limiting groove through the groove opening, and comprises a first parallel surface pair and a second parallel surface pair; and when swinging to abut against the first limiting surfaces, the first parallel surface pair prevents the swing arm from continuing to swing in a first direction; and when swinging to abut against the second limiting surfaces, the second parallel surface pair prevents the swing arm from continuing to swing in a second direction which is opposite to the first direction.

103. The swing mechanism according to claim 101, wherein, an extension direction of the limiting groove is perpendicular to an axial direction of the pivot, and a position of the limiting member inside the limiting groove is adjustable; and the limiting member comprises an opening allowing the pivot to pass through, the opening comprises a first hole portion and a second hole portion; the first hole portion comprises a first wall and a second wall, and the first limiting surface and the second limiting surface both are formed on the first wall, and both are formed on the second wall; and the second hole portion is configured to engage with the abutting member to lock the swing arm.

104. The swing mechanism according to claim 101, wherein: an extension direction of the limiting groove is parallel to an axial direction of the pivot; the limiting member comprises a first region and a second region; the first region has the first limiting surface and the second limiting surface; the second region is adapted to engage with the abutting member to lock the swing arm; and the limiting member slidably engages with the limiting groove and has a first position and a second position; when the limiting member is at the first position, the first region engages with the abutting member; and when the limiting member is at the second position, the second region engages with the abutting member.

105. The swing mechanism according to claim 104, wherein, the limiting member comprises a force receiving plate and at least one arm extending from the force receiving plate, and the first region and the second region are formed on the at least one arm; at least one first groove portion is formed on an outer periphery of the abutting member, the at least one arm passes through the at least one first groove portion, and the first region is adapted to swing in a corresponding first groove portion; and at least one second groove portion is further formed on the abutting member, and the second region is adapted to engage with a corresponding second groove portion.

106. The swing mechanism according to claim 105, wherein: the baby carrier further comprises a driving wheel fitting over the pivot and abutting against the force receiving plate; and one of a wall of the limiting groove and the driving wheel is provided with ratchet portions, and another of the wall of the limiting groove and the driving wheel is provided with a ratchet groove part; the ratchet groove part comprises a first ratchet groove having a first groove depth and a second ratchet groove having a second groove depth, which are sequentially arranged circumferentially; the first groove depth is not equal to the second groove depth; and when receiving a pressing force, the driving wheel moves axially and rotates circumferentially, and the ratchet portion engages with the first ratchet groove and the second ratchet groove in sequence.

107. A seat connecting structure, characterized by comprising: a support frame, comprising a first support rod and a second support rod arranged to be opposite to each other; a first positioning groove and a second positioning groove, wherein the first positioning groove and the second positioning groove are formed on a first surface of the seat, the first positioning groove is configured to receive the first support rod, and the second positioning groove is configured to receive the second support rod; and a locking device, comprising a first blocking member, a second blocking member and an elastic element, wherein the first blocking member and the second blocking member each slidably engage with the seat, and the elastic element is configured to drive the first blocking member and the second blocking member to be at a locking position.

108. The seat connecting structure according to claim 107, wherein, a second surface of the seat comprises a first sliding groove and a second sliding groove; the first sliding groove intersects with the first positioning groove; the second sliding groove intersects with the second positioning groove; the second surface of the seat and the first surface of the seat face away from each other; and the first blocking member is slidably disposed in the first sliding groove, and the second blocking member is slidably disposed in the second sliding groove.

109. The seat connecting structure according to claim 108, wherein: the seat further has a third sliding groove, and the first sliding groove and the second sliding groove communicate by means of the third sliding groove; the locking device further comprises a connecting bracket; the connecting bracket is disposed in the third sliding groove; two ends of the connecting bracket are respectively provided with a first surface and a second surface each bent downwards relative to the connecting bracket; the first blocking member is connected to the first surface, and the second blocking member is connected to the second surface; and a bottom wall of the third sliding groove comprises a fourth elongated hole; a fastener is installed inside the connecting bracket; and a first end of the fastener is configured to passes through and goes out of the fourth elongated hole.

110. The seat connecting structure according to claim 109, wherein: the first surface of the seat further comprises a fourth sliding groove; the fourth sliding groove and the third sliding groove are adjacent in an extension direction of the fastener; the fourth sliding groove is located between the first sliding groove and the second sliding groove; the locking device further comprises a third releasing member; the third releasing member is received in the fourth sliding groove; the first end of the fastener is connected to the third releasing member; and the elastic element is clamped between a side wall of the fourth sliding groove and the third releasing member.

111. The seat connecting structure according to claim 110, wherein, a first end of the third releasing member comprises a first receiving groove; the first receiving groove is configured to receive an end of the elastic element; a second end of the third releasing member is provided with a pressing recess; and part region of the fourth sliding groove is provided with a shielding plate, and the shielding plate shields the elastic element.

112. The seat connecting structure according to claim 107, wherein the locking device further comprises a second linking member; the second linking member is operatively connected to the first blocking member and the second blocking member; when one of the first blocking member and the second blocking member is pushed to release one of the first support rod and the second support rod, another of the first blocking member and the second blocking member, under an action of the second linking member, is pushed to release another of the first support rod and the second support rod.

113. The seat connecting structure according to claim 112, wherein: the second surface of the seat has a main groove; the main groove intersects with the first positioning groove and the second positioning groove, respectively; the second surface of the seat and the first surface of the seat face away from each other; and the first blocking member and the second blocking member are slidably arranged in the main groove.

114. The seat connecting structure according to claim 113, wherein: a first end of the first blocking member and a first end of the second blocking member, which are away from each other, are configured to lock the first support rod and the second support rod, respectively; a first connecting boss is arranged on a second end of the first blocking member, and a second connecting boss is arranged on a second end of the second blocking member, and the second end of the first blocking member and the second end of the second blocking member are proximate to each other; and the second linking member is a rod; a first end of the second linking member is pivotally connected to the first connecting boss; and a second end of the second linking member is pivotally connected to the second connecting boss.

115. The seat connecting structure according to claim 114, wherein the elastic element comprises a first spring and a second spring; the first spring is arranged between an end of the first connecting boss and the second blocking member; and the second spring is arranged between an end of the second connecting boss and the first blocking member.

116. The seat connecting structure according to claim 114 or 115, wherein: a first end of the second linking member is provided with a first protruding column, and a second end of the second linking member is provided with a second protruding column; the first connecting boss comprises a fifth elongated hole slidably engaging with the first protruding column; the second connecting boss comprises a sixth elongated hole slidably engaging with the second protruding column; a first recess is formed on the first connecting boss; a first end of the second linking member is received in the first recess; the first protruding column is configured to enter the fifth elongated hole through the first recess; and a second recess is formed on the second connecting boss; a second end of the second linking member is received in the second recess; and the second protruding column is configured to enter the sixth elongated hole through the second recess.

117. The seat connecting structure according to claim 113, wherein: a first wedge and a second wedge are provided on a side wall of the main groove; the first wedge is configured to abut against the first blocking member; and the second wedge is configured to abut against the second blocking member; and/or a first end of the first blocking member and a first end of the second blocking member, which are far away from each other, are provided with a pushing bevel, respectively.