CN217892944U

CN217892944U - Children's barrow

Info

Publication number: CN217892944U
Application number: CN202221690299.4U
Authority: CN
Inventors: 马福生; 秦超毅
Original assignee: Goodbaby Child Products Co Ltd
Current assignee: Goodbaby Child Products Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-11-25
Anticipated expiration: 2032-06-30

Abstract

The utility model discloses a children cart, the frame of which comprises a telescopic frame, the telescopic frame comprises a middle frame, a front frame, a rear frame and a locking mechanism, the front frame is connected with the middle frame in a sliding way, and the rear frame is connected with the middle frame in a sliding way; the seat of the baby stroller has a single-seat working state and a double-seat working state, and the seat is arranged on the middle frame in the single-seat working state; in a double-seat working state, one seat is arranged on the front frame, and the other seat is arranged on the rear frame. The utility model discloses a children's shallow, its seat is when single seat operating condition and two-seater operating condition down, and the length adjustable of frame for the seat is when single seat operating condition down, and the length of frame is shorter under the relative two-seater operating condition, and whole children's shallow also can not occupy too big space, and the head of a family uses more nimble convenience.

Description

Children's barrow

Technical Field

The utility model relates to a children's articles for use field especially relates to a children's shallow.

Background

The children's shallow carries child for the adult and carries out outdoor activities and provides great facility, has alleviateed adult's burden of going on a journey. For some families with twins or families with small age difference between the first fetus and the second fetus, a child cart which can be taken by one person cannot meet the requirement, and the two carts are inconvenient to push simultaneously when going out, and the labor cost and the economic cost are increased. Therefore, in recent years, more and more single-double conversion child strollers can be used by one or two persons, which is more convenient to use and saves partial expenses for some families compared with the situation that two child strollers are purchased at the same time. However, in the prior art, no matter the stroller is in a single-use state or a double-use state, the length of the frame of the stroller is always fixed, and the length of the frame is longer than that of the common stroller which can be used by one person only and occupies a larger space because the length of the frame is longer than that of the common stroller which can be used by one person only in the single-use state due to the requirement of meeting the requirements of single-use and double-use.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough of prior art, provide an improved children's shallow.

In order to achieve the purpose, the utility model adopts the technical proposal that:

a children's barrow comprises a frame, a front wheel arranged below the front part of the frame, a rear wheel arranged below the rear part of the frame, a seat arranged on the frame and a push handle rod connected to the frame;

the frame comprises a frame which can stretch out and draw back along the front-back direction, and the frame comprises a middle frame, a front frame, a rear frame and a locking mechanism;

the middle frame comprises a left middle connecting rod positioned on the left side, a right middle connecting rod positioned on the right side, and a middle transverse connecting rod which is respectively connected with the left middle connecting rod and the right middle connecting rod to form a rigid whole;

the front frame comprises a left front connecting rod positioned on the left side, a right front connecting rod positioned on the right side and a front transverse connecting rod which is respectively connected with the left front connecting rod and the right front connecting rod to form a rigid whole;

the rear frame comprises a left rear connecting rod positioned on the left side, a right rear connecting rod positioned on the right side and a rear transverse connecting rod which is respectively connected with the left rear connecting rod and the right rear connecting rod to form a rigid whole;

the front part of the left middle connecting rod is connected with the left front connecting rod in a sliding manner along the length extending direction of the left middle connecting rod, and the front part of the right middle connecting rod is connected with the right front connecting rod in a sliding manner along the length extending direction of the right middle connecting rod, so that the front frame and the middle frame can extend and retract; the rear part of the left middle connecting rod is connected with the left rear connecting rod in a sliding manner along the length extending direction of the left middle connecting rod, and the rear part of the right middle connecting rod is connected with the right rear connecting rod in a sliding manner along the length extending direction of the right middle connecting rod, so that the rear frame and the middle frame can be stretched; the locking mechanism has a locking working state and an unlocking working state, the locking mechanism prohibits the relative sliding between the middle frame and the front frame or/and the relative sliding between the middle frame and the rear frame in the locking working state, and the locking mechanism allows the relative sliding between the middle frame and the front frame or/and the relative sliding between the middle frame and the rear frame in the unlocking working state;

the seat has a single-seat working state and a double-seat working state, and is arranged on the middle frame in the single-seat working state; in the double-seat working state, one seat is arranged on the front frame, and the other seat is arranged on the rear frame.

According to some preferred embodiments of the present invention, the left intermediate connecting rod and the right intermediate connecting rod are respectively and fixedly connected with a left fixing seat and a right fixing seat; in the locking working state, the locking mechanism locks the relative positions between the front frame and the middle frame and between the rear frame and the middle frame; under the unlocking working state, the front frame and the middle frame are allowed to stretch and retract, and the rear frame and the middle frame are allowed to stretch and retract; the locking mechanism includes:

the left front locking mechanism is used for locking the relative position between the left middle connecting rod and the left front connecting rod and is arranged in the left fixed seat;

the left rear locking mechanism is used for locking the relative position between the left middle connecting rod and the left rear connecting rod and is arranged in the left fixed seat;

the right front locking mechanism is used for locking the relative position between the right middle connecting rod and the right front connecting rod and is arranged in the right fixed seat;

the right rear locking mechanism is used for locking the relative position between the right middle connecting rod and the right rear connecting rod and is arranged in the right fixed seat;

and the synchronous linkage mechanism is used for enabling the four locking mechanisms of the left front locking mechanism, the left rear locking mechanism, the right front locking mechanism and the right rear locking mechanism to synchronously enter a locking working state or synchronously enter an unlocking working state.

According to some preferred embodiments of the present invention, the left front locking mechanism includes a left front swing link, the middle of the left front swing link is pivotally connected to the front portion of the left fixing base through a left front swing link shaft, the front end of the left front swing link has a locking pin, the rear end of the left front swing link is a driving portion, a plurality of locking holes are distributed on the left front connecting rod along the length direction of the left front connecting rod, the left middle connecting rod also has a locking hole, and the locking pin is inserted into both the locking hole on the left front connecting rod and the locking hole on the left middle connecting rod when the left front locking mechanism is in a locking working state; when the left front locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the left front connecting rod.

According to some preferred embodiments of the present invention, the left rear locking mechanism includes a left rear swing link, the middle of the left rear swing link is pivotally connected to the rear portion of the left fixing base through a left rear swing link pivot, the rear end of the left rear swing link has a locking pin, the front end of the left rear swing link is a driving portion, a plurality of locking holes are distributed on the left rear connecting rod along the length direction of the left rear connecting rod, the left middle connecting rod is also provided with a locking hole, and the locking pin is inserted into both the locking hole on the left rear connecting rod and the locking hole on the left middle connecting rod when the left rear locking mechanism is in a locking working state; when the left rear locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the left rear connecting rod.

According to some preferred implementation aspects of the present invention, the right front locking mechanism includes a right front swing rod, the middle of the right front swing rod is pivotally connected to the front portion of the right fixing seat through a right front swing rod rotating shaft, a locking pin is provided at the front end of the right front swing rod, the rear end of the right front swing rod is a driving portion, a plurality of locking holes are distributed on the right front connecting rod along the length direction of the right front connecting rod, a locking hole is also provided on the right middle connecting rod, and when the right front locking mechanism is in a locking working state, the locking pin is inserted into both the locking hole on the right front connecting rod and the locking hole on the right middle connecting rod; when the right front locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the right front connecting rod.

According to some preferred implementation aspects of the present invention, the right rear locking mechanism includes a right rear swing link, the middle portion of the right rear swing link is pivotally connected to the rear portion of the right fixing seat through a right rear swing link pivot, the rear end portion of the right rear swing link is provided with a locking pin, the front end portion of the right rear swing link is a driving portion, a plurality of locking holes are distributed on the right rear connecting rod along the length direction of the right rear connecting rod, the right middle connecting rod is also provided with a locking hole, and when the right rear locking mechanism is in a locking working state, the locking pin is inserted into one locking hole on the right rear connecting rod and is also inserted into the locking hole on the right middle connecting rod; when the right rear locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the right rear connecting rod.

According to some preferred aspects of the present invention, the synchronous linkage comprises,

the unlocking button is arranged in the left fixing seat in a sliding manner, and a button guide inclined plane is arranged on the unlocking button;

the unlocking handle is arranged in the right fixed seat in a sliding manner, and a handle guide inclined plane is arranged on the unlocking handle;

the left and right synchronous connecting rods are respectively connected with the unlocking button and the unlocking handle;

when the unlocking button is pressed, the unlocking button slides relative to the left fixing seat, or the unlocking handle is pulled to slide relative to the right fixing seat, the driving part of the left front swing rod and the driving part of the left rear swing rod are respectively contacted with the button guide inclined plane, so that the left front swing rod and the left rear swing rod are driven to rotate, meanwhile, the driving part of the right front swing rod and the driving part of the right rear swing rod are respectively contacted with the handle guide inclined plane, so that the right front swing rod and the right rear swing rod are driven to rotate, and the left front locking mechanism, the left rear locking mechanism, the right front locking mechanism and the right rear locking mechanism are synchronously switched from a locking working state to an unlocking working state.

According to some preferred implementation aspects of the utility model, unlock button along control the direction set up with sliding in left fixing base in, unlock handle along control the direction set up with sliding in right fixing base in, left and right synchronous connecting rod with unlock button unlock handle rigidly connect as an organic wholely.

the unlocking button is arranged in the right fixed seat in a sliding manner, and a button guide inclined plane is arranged on the unlocking button;

the unlocking handle is arranged in the left fixing seat in a sliding manner, and a handle guide inclined plane is arranged on the unlocking handle;

when the unlocking button is pressed, the unlocking button slides relative to the right fixing seat, or the unlocking handle is pulled to slide relative to the left fixing seat, the driving part of the right front swing rod and the driving part of the right rear swing rod are respectively contacted with the button guide inclined plane so as to drive the right front swing rod and the right rear swing rod to rotate, meanwhile, the driving part of the left front swing rod and the driving part of the left rear swing rod are respectively contacted with the handle guide inclined plane so as to drive the left front swing rod and the left rear swing rod to rotate, so that the left front locking mechanism, the left rear locking mechanism, the right front locking mechanism and the right rear locking mechanism are synchronously switched from a locking working state to an unlocking working state.

According to some preferred implementation aspects of the utility model, unlock button along control the direction set up with sliding in right side fixing base in, unlock handle along control the direction set up with sliding in left side fixing base in, left and right synchronous connecting rod with unlock button unlock handle rigidly connect as an organic wholely.

According to some preferred embodiments of the present invention, the intermediate transverse link is tubular, and the left and right synchronization links are located in the intermediate transverse link.

According to some preferred implementation aspects of the present invention, the button guide slope inclines relative to the sliding direction of the unlocking button, the handle guide slope inclines relative to the sliding direction of the handle, and the button guide slope is the same as the handle guide slope.

According to some preferred aspects of the present invention, the seat comprises a seat body and a seat support upright, the seat body being connected to the seat support upright; under the working state of a single seat, the lower end part of the seat supporting upright rod is detachably connected with the middle frame; in the double-seat working state, the lower end part of the seat supporting upright rod on one seat is detachably connected with the front frame, and the lower end part of the seat supporting upright rod on the other seat is detachably connected with the rear frame.

According to some preferred embodiments of the present invention, in the single-seat working state, the lower end portion of the seat support upright is detachably connected to the left intermediate link and the right intermediate link; under the working state of double seats, the lower end part of the seat supporting upright stanchion on one seat is detachably connected with the left front connecting rod and the right front connecting rod, and the lower end part of the seat supporting upright stanchion on the other seat is detachably connected with the left rear connecting rod and the right rear connecting rod.

According to some preferred embodiments of the present invention, in a single seat working state, an intermediate upright rod locking mechanism is disposed between the lower end of the seat support upright rod and the intermediate frame, and in a locking working state, the intermediate upright rod locking mechanism prohibits detachment of the lower end of the seat support upright rod from the intermediate frame, and in an unlocking working state, the intermediate upright rod locking mechanism permits detachment of the lower end of the seat support upright rod from the intermediate frame after detachment; under the working state of double seats, a seat is provided with a seat supporting upright rod lower end and a front frame between which a front upright rod locking mechanism is arranged, the upright rod front locking mechanism prohibits the seat supporting upright rod lower end from being detached from the front frame under the locking working state, the upright rod front locking mechanism permits the seat supporting upright rod lower end to be detached from the front frame under the unlocking working state, the seat supporting upright rod lower end and the rear frame between which a rear upright rod rear locking mechanism is arranged on the other seat, the upright rod rear locking mechanism prohibits the seat supporting upright rod lower end from being detached from the rear frame under the locking working state, and the upright rod rear locking mechanism permits the seat supporting upright rod lower end to be detached from the rear frame under the unlocking working state.

According to some preferred aspects of the present invention, the seat comprises a seat body and a seat supporting upright, the seat body being connected to the seat supporting upright; in the single seat working state, the lower end part of the seat supporting upright rod is pivotally connected with the middle frame, a rotation-stopping middle locking mechanism is arranged between the lower end part of the seat supporting upright rod and the middle frame, the lower end part of the seat supporting upright rod is forbidden to pivot with the middle frame when the rotation-stopping middle locking mechanism is in the locking working state, the lower end part of the seat supporting upright rod is allowed to rotate relative to the middle frame when the rotation-stopping middle locking mechanism is in the unlocking working state, and the seat and the middle frame are in the folded state; in a double-seat working state, the lower end part of the seat supporting upright rod on one seat is pivotally connected with the front frame, a rotation-stopping front locking mechanism is arranged between the lower end part of the seat supporting upright rod and the front frame, the lower end part of the seat supporting upright rod and the front frame are forbidden to pivot when the rotation-stopping front locking mechanism is in a locking working state, the lower end part of the seat supporting upright rod is allowed to rotate relative to the front frame when the rotation-stopping front locking mechanism is in an unlocking working state, and the seat and the front frame are in a folding state; on another seat the lower tip of seat support pole setting with back frame pivot ground connect, the seat support pole setting the lower tip with the back frame between be provided with the locking mechanical system after the spline locking mechanical system under the locking operating condition, forbid the seat support pole setting the lower tip with back frame pivot, the spline after the locking mechanical system be in unblock operating condition under, allow the seat support pole setting the lower tip for the back frame rotate, the seat with the back frame be in fold condition.

Due to the application of the technical scheme, the length of the frame of the baby stroller provided by the utility model can be adjusted by the telescopic frame when the seat is in the single-seat working state and the double-seat working state, so that the length of the frame is shorter than that of the frame in the double-seat working state when the seat is in the single-seat working state, the whole baby stroller can not occupy too large space, and the baby stroller is more flexible and convenient for parents to use; when the double-seat working state is required to be converted, the frame of the frame only needs to be extended, and double-seat riding is not influenced.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic three-dimensional structure (sitting posture) of the stroller in the embodiment of the present invention in the unfolded state and with the seat in the single-seat working state;

fig. 2 is a schematic three-dimensional structure of the stroller in the embodiment of the present invention in the unfolded state and the seat in the two-seat working state (the sitting state in which two children sit forward and face in the same direction);

fig. 3 is an exploded schematic view of the stroller in the embodiment of the present invention with part of the structure hidden;

FIG. 3a is an enlarged partial view of the portion A of FIG. 3;

FIG. 3B is a partially enlarged structural view of the portion B in FIG. 3;

fig. 4 is a schematic perspective view of the stroller in the embodiment of the present invention in a state where a part of the structure is hidden when the stroller is unfolded and the locking mechanism is in a locking working state;

FIG. 5 is a schematic sectional view of the structure along the direction G-G in FIG. 4;

FIG. 6 is an enlarged partial view of the portion C of FIG. 5;

FIG. 7 is a schematic cross-sectional view taken along the direction H-H in FIG. 4;

FIG. 8 is an enlarged partial view of the portion D of FIG. 7;

FIG. 9 is a schematic sectional view taken along line I-I of FIG. 4;

FIG. 10 is a schematic cross-sectional view taken along the direction J-J in FIG. 4;

FIG. 11 is a schematic sectional view taken along the line K-K in FIG. 4;

fig. 12 is a schematic perspective view of the stroller in the embodiment of the present invention in an unlocked state after a part of the structure of the stroller is hidden in an unfolded state;

FIG. 13 is a cross-sectional view taken along the line L-L in FIG. 12;

FIG. 14 is an enlarged partial view of section E of FIG. 13;

FIG. 15 is a cross-sectional view of the structure of FIG. 12 taken along the line M-M;

FIG. 16 is an enlarged partial view of the portion F of FIG. 15;

FIG. 17 is a schematic cross-sectional view of the structure in the direction N-N in FIG. 12;

FIG. 18 is a cross-sectional view of the structure of FIG. 12 taken along line O-O;

FIG. 19 is a schematic cross-sectional view taken along the line P-P in FIG. 12;

fig. 20 is a schematic perspective view (lying position) of the stroller in the embodiment of the present invention in a unfolded state and with a single seat working state;

FIG. 21 is a cross-sectional view taken along the direction Q-Q of the front and rear wheel assemblies shown in FIG. 20 with the right side of the frame hidden (with the middle locking mechanism in the locked position);

FIG. 22 is an enlarged partial view of the section X of FIG. 21;

FIG. 23 is a schematic cross-sectional view taken along the direction R-R in FIG. 20, with the push handle bar and the right front and rear wheel assemblies of the frame hidden (with the middle locking mechanism in the locked state);

FIG. 24 is a cross-sectional view in the direction Q-Q of the front and rear wheel assemblies shown in FIG. 20 with the right side of the frame hidden (with the upright intermediate locking mechanism in an unlocked position);

FIG. 25 is an enlarged partial schematic view of the Y-section of FIG. 24;

FIG. 26 is a schematic cross-sectional view of the front and rear wheel assemblies shown in FIG. 20 with the handlebar and the frame left out and with the rear wheel assembly in the R-R direction (the middle locking mechanism of the vertical rod is in an unlocked state);

FIG. 27 is a cross-sectional view in the direction Q-Q of the front and rear wheel assemblies shown in FIG. 20 with the right side of the frame hidden (with the seat removed from the frame);

FIG. 28 is an enlarged partial view of the Z portion of FIG. 27;

FIG. 29 is a cross-sectional view in the direction R-R of FIG. 20 with the push rod and the front and rear wheel assemblies on the right side of the frame shown in hidden position (with the seat removed from the frame);

FIG. 30 is a cross-sectional view taken along the line S-S of FIG. 20 (with the intermediate detent mechanism in a detent position);

FIG. 31 is a cross-sectional view taken along the line S-S of FIG. 20 (with the intermediate detent mechanism in an unlocked position);

FIG. 32 is a schematic illustration of the stroller of FIG. 31 during folding;

fig. 33 is a perspective view of the stroller of fig. 20 in a folded position;

fig. 34 is a perspective view of the stroller of fig. 2 in a folded position;

fig. 35 is a schematic perspective view of the stroller in the embodiment of the present invention in a unfolded state and with the seat in a double-seat working state (a sitting posture state when two children sit back to back);

fig. 36 is a schematic perspective view of the stroller in the embodiment of the present invention in a unfolded state and with the seat in a double-seat working state (a sitting posture state when two children sit in opposite directions);

fig. 37 is a schematic perspective view of the stroller in the embodiment of the present invention in a unfolded state and with the seat in a double-seat working state (a sitting posture when two children sit face to face);

fig. 38 is a schematic perspective view of the stroller in the embodiment of the present invention in a unfolded state and with the seat in a double-seat working state (one child is in a lying position, and the other child is in a sitting position when the child is sitting in the forward direction);

wherein: stroller-100;

a vehicle frame-1, a middle frame-110, a left middle connecting rod-111, a right middle connecting rod-112, a middle cross connecting rod-113, a left fixed seat-114, a right fixed seat-115, a kidney-shaped hole-116, an auxiliary part-117, a front frame-120, a left front connecting rod-121, a right front connecting rod-122, a front cross connecting rod-123, a rear frame-130, a left rear connecting rod-131, a right rear connecting rod-132, a rear cross connecting rod-133, a left front locking mechanism-140, a left front swing rod-141, a left front driving part-141 a, a left front swing rod rotating shaft-142, a left rear locking mechanism-150, a left rear swing link-151, a left rear driving part-151 a, a left rear swing link rotating shaft-152, a right front locking mechanism-160, a right front swing link-161, a right front driving part-161 a, a right front swing link rotating shaft-162, a right rear locking mechanism-170, a right rear swing link-171, a right rear driving part-171 a, a right rear swing link rotating shaft-172, an unlocking button-181, a button guide inclined surface-181 a, a button cover-181 b, an unlocking handle-182, a handle guide inclined surface-182 a, a handle cover-182 b, a left and right synchronizing link-183, a locking pin-101 and a locking hole-102;

a front wheel assembly-2, a front wheel-21 and a front wheel joint-22;

rear wheel assembly-3, rear wheel-31, rear wheel joint-32;

a seat-4, a seat body-41, a seat supporting upright-42;

a push handle rod-5;

the vertical rod middle locking mechanism-6, the locking piece-61, the locking piece rotating shaft-611, the unlocking piece-612, the locking hook-613, the matching piece-62 and the locking groove-621;

a rotation stopping intermediate locking mechanism-7.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "left-right direction", and the like indicate orientations or positional relationships only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, only have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 38, the stroller 100 capable of single-person and double-person conversion of the present invention includes a frame 1, two sets of front wheel assemblies 2 disposed on the left and right sides of the front portion of the frame 1, two sets of rear wheel assemblies 3 disposed on the left and right sides of the rear portion of the frame 1, a seat 4 disposed on the frame 1, and a handle bar 5 connected to the frame 1.

Further, referring to fig. 1 to 3, 4 and 12, 20 to 38, the vehicle frame 1 includes a telescopic frame including a middle frame 110, a front frame 120, a rear frame 130, and a locking mechanism. The locking mechanism has a locking operation state in which the locking mechanism locks the relative positions between the front frame 120 and the middle frame 110 and between the rear frame 130 and the middle frame 110, and an unlocking operation state; in the unlocked operating state, the front frame 120 and the middle frame 110 and the rear frame 130 and the middle frame 110 are allowed to extend and contract, so that the length of the vehicle frame 1 is extended or shortened.

Further, referring to fig. 3, the middle frame 110 includes a left middle link 111 located at the left side, a right middle link 112 located at the right side, and a tubular middle cross link 113 connected to the left middle link 111 and the right middle link 112 respectively to form a rigid body, the front bottom and the rear bottom of the left middle link 111 of the present embodiment are respectively provided with two locking holes 102, and the front bottom and the rear bottom of the right middle link 112 are also respectively provided with two locking holes 102 (as shown in fig. 14); the left middle connecting rod 111 and the right middle connecting rod 112 are respectively and fixedly connected with a left fixed seat 114 and a right fixed seat 115; the front frame 120 comprises a left front connecting rod 121 positioned on the left side of the frame 1, a right front connecting rod 122 positioned on the right side of the frame 1, and a front cross connecting rod 123 which is respectively connected with the left front connecting rod 121 and the right front connecting rod 122 to form a rigid whole; the rear frame 130 includes a left rear link 131 located on the left side of the frame 1, a right rear link 132 located on the right side of the frame 1, and a rear cross link 133 connected to the left rear link 131 and the right rear link 132, respectively, to form a rigid body. Specifically, in the present embodiment, the front portion and the rear portion of the left middle link 111 are respectively provided with a waist-shaped hole 116, so that the front portion of the left middle link 111 and the left front link 121 are slidably connected along the length extending direction of the left middle link 111, and the rear portion of the left middle link 111 and the left rear link 131 are slidably connected along the length extending direction of the left middle link 111; the front and rear portions of the right intermediate link 112 are respectively provided with a waist-shaped hole 116, so that the front portion of the right intermediate link 112 is slidably connected with the right front link 122 along the length extending direction of the right intermediate link 112, the rear portion of the right intermediate link 112 is slidably connected with the right rear link 132 along the length extending direction of the right intermediate link 112, and finally the front frame 120 and the intermediate frame 110 can be extended and retracted, and the rear frame 130 and the intermediate frame 110 can be extended and retracted. In addition, the left middle connecting rod 111 and the right middle connecting rod 112 are both provided with a tube cavity, auxiliary pieces 117 are arranged in the tube cavity of the left middle connecting rod 111 corresponding to the two kidney-shaped holes 116, the auxiliary pieces 117 are also arranged in the tube cavity of the right middle connecting rod 112 corresponding to the two kidney-shaped holes 116, and the arrangement of the auxiliary pieces 117 can ensure that the sliding between the left middle connecting rod 111 and the left front connecting rod 121, between the left middle connecting rod 111 and the left rear connecting rod 131, between the right middle connecting rod 112 and the right front connecting rod 122 and between the right middle connecting rod 112 and the right rear connecting rod 132 is more stable, so that the relative shaking of the frames between the connecting rods in the telescopic process is avoided.

Further, each set of front wheel assemblies 2 comprises a front wheel 21 and a front wheel joint 22, the two front wheel joints 22 are respectively arranged at the end parts of the left front connecting rod 121 and the right front connecting rod 122, and the front wheel 21 is rotatably arranged on the front wheel joint 22; each set of rear wheel assemblies 3 comprises a rear wheel 31 and a rear wheel joint 32, the two rear wheel joints 32 are respectively arranged at the ends of the left rear connecting rod 131 and the right rear connecting rod 132, and the rear wheel 31 is rotatably arranged on the rear wheel joint 32.

Further, referring to fig. 3, 5 to 19, the locking mechanism includes a left front locking mechanism 140, a left rear locking mechanism 150, a right front locking mechanism 160, a right rear locking mechanism 170, and a synchronization link mechanism. The left front locking mechanism 140 and the left rear locking mechanism 150 are both disposed in the left fixing seat 114 and are respectively used for locking the relative position between the left middle connecting rod 111 and the left front connecting rod 121 and the relative position between the left middle connecting rod 111 and the left rear connecting rod 131; the right front locking mechanism 160 and the right rear locking mechanism 170 are both disposed in the right fixing base 115 for locking the relative position between the right intermediate link 112 and the right front link 122, and the relative position between the right intermediate link 112 and the right rear link 132, respectively. The synchronous linkage mechanism is used for synchronously enabling the four locking mechanisms of the left front locking mechanism 140, the left rear locking mechanism 150, the right front locking mechanism 160 and the right rear locking mechanism 170 to be in a locking working state or an unlocking working state.

Specifically, referring to fig. 3 and 3a, the left front locking mechanism 140 includes a left front swing link 141, a middle portion of the left front swing link 141 is pivotally connected to a front portion of the left fixing base 114 through a left front swing link rotating shaft 142, a front end portion of the left front swing link 141 is provided with a locking pin 101, a rear end portion thereof is a left front driving portion 141a, and a plurality of locking holes 102 are distributed on the left front connecting rod 121 along a length direction thereof. The left rear locking mechanism 150 includes a left rear swing link 151, the middle portion of the left rear swing link 151 is pivotally connected to the rear portion of the left fixing base 114 through a left rear swing link rotating shaft 152, the rear end portion of the left rear swing link 151 is provided with a locking pin 101, the front end portion thereof is a left rear driving portion 151a, and a plurality of locking holes 102 are distributed along the length direction of the left rear connecting rod 131. Referring to fig. 3 and 3b, the right front locking mechanism 160 includes a right front swing link 161, the middle portion of the right front swing link 161 is pivotally connected to the front portion of the right fixing seat 115 through a right front swing link rotating shaft 162, the front end portion of the right front swing link 161 has a locking pin 101, the rear end portion thereof is a right front driving portion 161a, and a plurality of locking holes 102 are distributed on the right front link 122 along the length direction thereof. The right rear locking mechanism 170 includes a right rear swing link 171, a middle portion of the right rear swing link 171 is pivotally connected to a rear portion of the right fixing base 115 through a right rear swing link rotating shaft 172, a rear end portion of the right rear swing link 171 is provided with a locking pin 101, a front end portion thereof is a right rear driving portion 171a, and a plurality of locking holes 102 are also distributed on the right rear connecting rod 132 along a length direction thereof. The plurality of locking holes 102 on the left front link 121, the left rear link 131, the right front link 122 and the right rear link 132 are arranged, so that the length of the telescopic frame 1 has more selectivity. When the locking mechanism is in a locking working state, referring to fig. 5 to 8, the locking pin 101 of the left front swing link 141 is inserted into both the locking hole 102 on the left front connecting rod 121 and the locking hole 102 at the front bottom of the left intermediate connecting rod 111, the locking pin 101 of the left rear swing link 151 is inserted into both the locking hole 102 on the left rear connecting rod 131 and the locking hole 102 at the rear bottom of the left intermediate connecting rod 111, the locking pin 101 of the right front swing link 161 is inserted into both the locking hole 102 on the right front connecting rod 122 and the locking hole 102 at the front bottom of the right intermediate connecting rod 112, and the locking pin 101 of the right rear swing link 171 is inserted into both the locking hole 102 on the right rear connecting rod 132 and the locking hole 102 at the rear bottom of the right intermediate connecting rod 112. When the locking mechanism is in an unlocking working state, referring to fig. 13 to 16, the locking pin 101 of the left front swing link 141 is disengaged from the locking hole 102 at the front bottom of the left middle link 111 and the locking hole 102 on the left front link 121, the locking pin 101 of the left rear swing link 151 is disengaged from the locking hole 102 at the rear bottom of the left middle link 111 and the locking hole 102 on the left rear link 131, the locking pin 101 of the right front swing link 161 is disengaged from the locking hole 102 at the front bottom of the right middle link 112 and the locking hole 102 on the right front link 122, and the locking pin 101 of the right rear swing link 171 is disengaged from the locking hole 102 at the rear bottom of the right middle link 112 and the locking hole 102 on the right rear link 132.

Specifically, referring to fig. 3, the synchronization linkage includes an unlock button 181, an unlock knob 182, and left and right synchronization links 183 located inside the tubular intermediate cross link 113, both ends of the left and right synchronization links 183 being rigidly connected to the unlock button 181 and the unlock knob 182, respectively, as one body (as shown in fig. 11 and 19). The unlocking button 181 is provided with a button guide inclined plane 181a, and the unlocking handle 182 is provided with a handle guide inclined plane 182a. The unlocking button 181 can be slidably disposed in the left fixing seat 114, and the unlocking handle 182 is slidably disposed in the right fixing seat 115; alternatively, the unlock button 181 is slidably disposed in the right fixing base 115, and the unlock handle 182 is slidably disposed in the left fixing base 114. In this embodiment, the unlock button 181 is slidably disposed in the left fixing base 114 in the left-right direction, the unlock handle 182 is slidably disposed in the right fixing base 115 in the left-right direction, and the unlock button 181b is covered by a button cover 181b, and the unlock handle 182 is covered by a handle cover 182b, so that the internal components can be protected, and dust can be prevented from falling. The button guide slope 181a is inclined with respect to the sliding direction of the unlock button 181, the handle guide slope 182a is inclined with respect to the sliding direction of the handle, and the button guide slope 181a and the handle guide slope 182a are inclined in the same direction. Referring to fig. 6, 8 to 10, 14, 16 to 18, when the frame needs to be extended or retracted, the locking mechanism needs to be unlocked, the unlocking button 181 needs to be pressed, so that the unlocking button 181 slides relative to the left fixing seat 114, and the unlocking handle 182 is driven by the left and right synchronization connecting rods 183 to slide relative to the right fixing seat 115; or the unlocking handle 182 is pulled to enable the unlocking handle 182 to slide relative to the right fixed seat 115, the left synchronization link 183 drives the unlocking button 181 to slide relative to the left fixed seat 114, and in the unlocking process, the left front driving part 141a of the left front swing rod 141 and the left rear driving part 151a of the left rear swing rod 151 are respectively contacted with the button guide inclined plane 181a, so that the left front swing rod 141 and the left rear swing rod 151 are driven to rotate, the locking pin 101 of the left front swing rod 141 is separated from the locking hole 102 at the front bottom of the left middle link 111 and the locking hole 102 on the left front link 121, and the locking pin 101 of the left rear swing rod 151 is separated from the locking hole 102 at the rear bottom of the left middle link 111 and the locking hole 102 on the left rear link 131; meanwhile, the right front driving portion 161a of the right front swing link 161 and the right rear driving portion 171a of the right rear swing link 171 are also in contact with the handle guide inclined surface 182a, so as to drive the right front swing link 161 and the right rear swing link 171 to rotate, so that the locking pin 101 of the right front swing link 161 is disengaged from the locking hole 102 at the front bottom of the right middle link 112 and the locking hole 102 on the right front link 122, and the locking pin 101 of the right rear swing link 171 is disengaged from the locking hole 102 at the rear bottom of the right middle link 112 and the locking hole 102 on the right rear link 132, so that the left front locking mechanism 140, the left rear locking mechanism 150, the right front locking mechanism 160 and the right rear locking mechanism 170 are synchronously switched from the locking working state to the unlocking working state.

Further, referring to fig. 1 and 2, 20, 30-38, the stroller 100 has an expanded state and a collapsed state. The seat 4 includes a seat body 41 and seat support uprights 42 provided at left and right sides of the seat body 41, the seat body 41 is connected to the two seat support uprights 42, the seat 4 has a single-seat operating state in which the frame 1 is short and the space is small and a double-seat operating state in which the two seat support uprights 42 of one seat 4 are detachably connected at lower end portions thereof to a left intermediate link 111 and a right intermediate link 112, respectively, and the two seat support uprights 42 are perpendicular to the left intermediate link 111 and the right intermediate link 112, respectively. In the double-seat working state and the stroller 100 is in the unfolding state, the length of the frame 1 is longer, the space is larger, the lower end parts of two seat supporting upright stanchions 42 on one seat 4 are respectively and detachably connected with a left front connecting rod 121 and a right front connecting rod 122, and the two seat supporting upright stanchions 42 on the seat 4 are respectively vertical to the left front connecting rod 121 and the right front connecting rod 122; the lower ends of the two support uprights of the other seat 4 are removably connected to a left rear connecting rod 131 and a right rear connecting rod 132, and the two seat support uprights 42 of the seat 4 are respectively perpendicular to the left rear connecting rod 131 and the right rear connecting rod 132.

Further, in the single seat working state, a vertical rod intermediate locking mechanism 6 is arranged between the lower end parts of the two seat supporting vertical rods 42 on one seat 4 and the left intermediate connecting rod 111 and the right intermediate connecting rod 112 respectively; in the two-seat operating state, a front upright locking mechanism is provided between the lower end portions of the two seat support uprights 42 on one seat 4 at the front of the frame 1 and the left and right

front links

121 and 122, respectively, and a rear upright locking mechanism is provided between the lower end portions of the two seat support uprights 42 on the other seat 4 at the rear of the frame 1 and the left and right

rear links

131 and 132. Specifically, referring to fig. 20 to 29, the upright intermediate locking mechanism 6 includes a locking piece 61 provided at the lower end portion of the seat support upright 42, and a fitting piece 62 provided on a left intermediate link 111 and a right intermediate link 112. The locking member 61 is pivotally connected to the lower end of the seat support upright 42 via a locking member rotating shaft 611, an unlocking member 612 is disposed at the upper end of the locking member 61, a locking hook 613 is disposed at the lower end of the locking member 61, and a locking groove 621 engaged with the locking hook 613 is disposed on the engaging member 62. The arrangement of the upright front locking mechanism and the upright rear locking mechanism is the same as that of the upright intermediate locking mechanism 6, except that the mating pieces 62 of the upright front locking mechanism are provided on the left front connecting rod 121 and the right front connecting rod 122, respectively, and the mating pieces 62 of the upright rear locking mechanism are provided on the left rear connecting rod 131 and the right rear connecting rod 132, respectively.

When the stroller 100 is in the unfolded state and the seat 4 is in the single-seat operating state, the vertical rod intermediate locking mechanisms 6 are in the locking operating state, and as shown in fig. 21 to 23, the lock hook 613 on the locking member 61 of one vertical rod intermediate locking mechanism 6 is inserted into the lock groove 621 of the mating member 62 on the left intermediate link 111, and the lock hook 613 on the locking member 61 of the other vertical rod intermediate locking mechanism 6 is inserted into the lock groove 621 of the mating member 62 on the right intermediate link 112, prohibiting the lower end portion of the seat support vertical rod 42 from being detached from the left intermediate link 111 and the right intermediate link 112.

When the stroller 100 needs to switch the seat 4 from the single-seat working state to the double-seat working state in the unfolded state, as shown in fig. 24 to fig. 26, the unlocking member 612 at the upper end of the locking member 61 of the vertical rod intermediate locking mechanism 6 is pressed to rotate the locking member 61 around the locking member rotating shaft 611, so that the locking hook 613 at the lower end is disengaged from the locking groove 621 of the mating member 62 on the left intermediate link 111; the unlocking member 612 at the upper end of the locking member 61 of the other vertical rod intermediate locking mechanism 6 is pressed to rotate the locking member 61 around the locking member rotating shaft 611, so that the locking hook 613 at the lower end is disengaged from the locking groove 621 of the mating member 62 on the right intermediate connecting rod 112, and the seat 4 in the middle of the frame 1 is pulled out upward, as shown in fig. 27 to 29. At this time, the unlocking button 181 is pressed or the unlocking handle 182 is pulled, the front frame 120 and the rear frame 130 are respectively pulled to the front part and the rear part of the frame 1 after the locking mechanism is unlocked, the length of the frame 1 is lengthened to be capable of simultaneously accommodating the next two seats 4, the unlocking button 181 is loosened or the unlocking handle 182 is pushed to lock the unlocking mechanism, and then the two seats 4 are respectively installed. The two seat supporting upright rods 42 of one seat 4 can be aligned with the mating pieces 62 on the left front connecting rod 121 and the right front connecting rod 122, and the seat supporting upright rods 42 can be inserted downwards onto the two mating pieces 62, so that the latch hook 613 at the lower end part of one locking piece 61 of the front vertical rod locking mechanism is inserted into the latch groove 621 of the mating piece 62 on the left front connecting rod 121, and the latch hook 613 at the lower end part of the other locking piece 61 of the front vertical rod locking mechanism is inserted into the latch groove 621 of the mating piece 62 on the right front connecting rod 122; then, the two seat supporting upright posts 42 of the other seat 4 are aligned with the mating members 62 on the left rear connecting rod 131 and the right rear connecting rod 132, and the seat supporting upright posts 42 are inserted downwards into the two mating members 62, so that the latch hook 613 at the lower end of one locking member 61 of the rear locking mechanism of the upright posts is inserted into the latch slot 621 of the mating member 62 on the left rear connecting rod 131, and the latch hook 613 at the lower end of the other locking member 61 of the rear locking mechanism of the upright posts is inserted into the latch slot 621 of the mating member 62 on the right rear connecting rod 132, so that the seat 4 is in a double-seat working state and can be used for two children to sit at the same time.

When the stroller 100 needs to switch the seat 4 from the double-seat working state to the single-seat working state in the unfolded state, the unlocking member 612 at the upper end of the locking member 61 of the vertical rod front locking mechanism can be pressed first to drive the locking member 61 to rotate around the locking member rotating shaft 611, so that the locking hook 613 at the lower end is disengaged from the locking groove 621 of the mating member 62 on the left front connecting rod 121; then, the unlocking piece 612 at the upper end part of the locking piece 61 of the front locking mechanism of the other vertical rod is pressed to drive the locking piece 61 to rotate around the rotating shaft 611 of the locking piece, so that the locking hook 613 at the lower end part is disengaged from the locking groove 621 of the matching piece 62 on the right front connecting rod 122, and the seat 4 at the front part of the frame 1 is pulled upwards; then, the unlocking piece 612 at the upper end of the locking piece 61 of the post rear locking mechanism is pressed to drive the locking piece 61 to rotate around the rotating shaft 611 of the locking piece, so that the latch hook 613 at the lower end is disengaged from the latch slot 621 of the mating piece 62 on the left rear connecting rod 131; then, the unlocking member 612 at the upper end of the locking member 61 of the rear locking mechanism of the other vertical rod is pressed to rotate the locking member 61 around the rotating shaft 611 of the locking member, so that the locking hook 613 at the lower end is disengaged from the locking groove 621 of the mating member 62 on the right rear connecting rod 132, and the seat 4 at the rear part of the frame 1 is pulled out upward. At this time, the unlocking button 181 is pressed or the unlocking handle 182 is pulled, the front frame 120 and the rear frame 130 are pushed towards the middle of the frame 1 after the locking mechanism is unlocked, the length of the frame 1 is shortened, the unlocking button 181 is released or the unlocking handle 182 is pushed to lock the unlocking mechanism, a seat 4 is arranged in the middle of the frame 1, two seat supporting upright rods 42 of the seat 4 are aligned with the matching pieces 62 on the left middle connecting rod 111 and the right middle connecting rod 112, the seat supporting upright rods 42 are downwards inserted into the two matching pieces 62, so that a locking hook 613 at the lower end part of one locking piece 61 of the upright rod middle locking mechanism 6 is inserted into a locking groove 621 of the matching piece 62 on the left middle connecting rod 111, a locking hook 613 at the lower end part of the other locking piece 61 of the upright rod middle locking mechanism 6 is inserted into a locking groove 621 of the matching piece 62 on the right middle connecting rod 112, the seat 4 is in a single seat working state, only a child can sit on the seat, the whole vehicle can occupy a small space, and the use of the parent is convenient.

Further, referring to fig. 23, 26, 28 and 29, the two locking grooves 621 are respectively opened on the two side portions of the fitting piece 62 of the fitting pieces 62 on the left middle connecting rod 111, the right middle connecting rod 112, the left front connecting rod 121, the right front connecting rod 122, the left rear connecting rod 131 and the right rear connecting rod 132, so that the seat 4 can be installed in the forward direction or the reverse direction in the single seat working state and the double seat working state, and the two locking grooves 621 on each fitting piece 62 ensure that the locking hooks 613 at the lower end portion of the locking piece 61 can be locked by being matched with the corresponding locking grooves 621 no matter the seat 4 is installed in the forward direction or the reverse direction. This enables the stroller 100 of the present invention to be taken by facing the parents or facing away from the parents when the seat 4 is in the single-seat working state, as shown in fig. 1 and 20, and the child can select the sitting posture state or the lying posture state; in the tandem operating position, two children may be seated face-to-face simultaneously (as shown in fig. 37), back-to-back simultaneously (as shown in fig. 35), or both children may be seated in one orientation simultaneously (as shown in fig. 2 and 36); one child can also be in a sitting position and the other in a lying position (as shown in fig. 38); or both children may be seated simultaneously (as shown in fig. 2, 35-37), providing a variety of options for the seating posture of the children. In addition, when the double seat works, the centers of the two seats 4 are positioned on the same horizontal plane, so that the seats are prevented from being ridden at high and low positions, and the communication between the two children is increased.

The seat 4 of the stroller 100 of the present invention can be folded in either a single-seat operating state or a double-seat operating state, as shown in fig. 33 and 34. Specifically, in the single seat operating state, the lower ends of the two seat support uprights 42 are pivotally connected to the left intermediate link 111 and the right intermediate link 112, respectively, and the rotation-stopping intermediate locking mechanisms 7 are provided between the lower ends of the two seat support uprights 42 and the left intermediate link 111 and the right intermediate link 112; in the two-seat operating state, the lower ends of the two seat support uprights 42 of one seat 4 are pivotally connected to the left and right

front links

121 and 122, respectively, a rotation-stop front lock mechanism is provided between the lower ends of the two seat support uprights 42 and the left and right

front links

121 and 122, the lower ends of the two seat support uprights 42 of the other seat 4 are pivotally connected to the left and right

rear links

131 and 132, and a rotation-stop rear lock mechanism is provided between the lower ends of the two seat support uprights 42 and the left and right

rear links

131 and 132. As shown in fig. 30 to 33, in order to illustrate the process of converting the stroller 100 from the unfolded state to the folded state when the seat 4 is in the single-seat working state, after the rotation-stop intermediate locking mechanism 7 is unlocked, the lower end portions of the two seat support uprights 42 can be rotated relative to the left intermediate link 111 and the right intermediate link 112, respectively, so that the stroller is in the folded state. When seat 4 is in two seats operating condition, the folding method of two seats 4 on frame 1 is similar when with single seat operating condition, only need fold two seats 4 down respectively, just the utility model discloses a locking mechanical system 7 in the middle of splines, before the spline locking mechanical system and spline back locking mechanical system be prior art, and three spline locking mechanical system's setting is also similar, and only mounted position is different. The utility model discloses a children's shallow 100's folding need not to convert double-seater operating condition into single-seater operating condition earlier, convenient operation, folding back compact structure, and is small.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A children's barrow comprises a frame, a front wheel arranged below the front part of the frame, a rear wheel arranged below the rear part of the frame, a seat arranged on the frame and a push handle rod connected to the frame;

the method is characterized in that:

the frame comprises a frame which can stretch along the front-back direction, and the frame comprises a middle frame, a front frame, a rear frame and a locking mechanism;

the front part of the left middle connecting rod is connected with the left front connecting rod in a sliding manner along the length extension direction of the left middle connecting rod, and the front part of the right middle connecting rod is connected with the right front connecting rod in a sliding manner along the length extension direction of the right middle connecting rod, so that the front frame and the middle frame can be stretched and contracted; the rear part of the left middle connecting rod is connected with the left rear connecting rod in a sliding manner along the length extending direction of the left middle connecting rod, and the rear part of the right middle connecting rod is connected with the right rear connecting rod in a sliding manner along the length extending direction of the right middle connecting rod, so that the rear frame and the middle frame can be stretched; the locking mechanism has a locking working state and an unlocking working state, the locking mechanism prohibits the relative sliding between the middle frame and the front frame or/and the relative sliding between the middle frame and the rear frame in the locking working state, and the locking mechanism allows the relative sliding between the middle frame and the front frame or/and the relative sliding between the middle frame and the rear frame in the unlocking working state;

2. The stroller of claim 1, wherein: the left middle connecting rod and the right middle connecting rod are respectively and fixedly connected with a left fixing seat and a right fixing seat; in the locking working state, the locking mechanism locks the relative positions between the front frame and the middle frame and between the rear frame and the middle frame; in an unlocking working state, the front frame and the middle frame are allowed to stretch and contract, and the rear frame and the middle frame are allowed to stretch and contract; the locking mechanism includes:

the left front locking mechanism is used for locking the relative position between the left middle connecting rod and the left front connecting rod, and is arranged in the left fixed seat;

3. The stroller of claim 2, wherein: the left front locking mechanism comprises a left front swing rod, the middle part of the left front swing rod is connected with the front part of the left fixed seat through a left front swing rod rotating shaft pivot, the front end part of the left front swing rod is provided with a locking pin, the rear end part of the left front swing rod is a driving part, a plurality of locking holes are distributed on the left front connecting rod along the length direction of the left front connecting rod, the left middle connecting rod is also provided with a locking hole, and the locking pin is inserted into one locking hole on the left front connecting rod and the locking hole on the left middle connecting rod when the left front locking mechanism is in a locking working state; when the left front locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the left front connecting rod.

4. The stroller of claim 3, wherein: the left rear locking mechanism comprises a left rear swing rod, the middle part of the left rear swing rod is connected with the rear part of the left fixed seat through a left rear swing rod rotating shaft pivot, the rear end part of the left rear swing rod is provided with a locking pin, the front end part of the left rear swing rod is a driving part, a plurality of locking holes are distributed on the left rear connecting rod along the length direction of the left rear connecting rod, the left middle connecting rod is also provided with a locking hole, and the locking pin is inserted into one locking hole on the left rear connecting rod and the locking hole on the left middle connecting rod when the left rear locking mechanism is in a locking working state; when the left rear locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the left rear connecting rod.

5. The stroller of claim 4, wherein: the right front locking mechanism comprises a right front swing rod, the middle part of the right front swing rod is connected with the front part of the right fixed seat through a right front swing rod rotating shaft pivot, the front end part of the right front swing rod is provided with a locking pin, the rear end part of the right front swing rod is a driving part, a plurality of locking holes are distributed on the right front connecting rod along the length direction of the right front connecting rod, the right middle connecting rod is also provided with a locking hole, and the locking pin is inserted into one locking hole on the right front connecting rod and the locking hole on the right middle connecting rod when the right front locking mechanism is in a locking working state; when the right front locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the right front connecting rod.

6. The stroller of claim 5, wherein: the right rear locking mechanism comprises a right rear swing rod, the middle part of the right rear swing rod is connected to the rear part of the right fixed seat through a right rear swing rod rotating shaft pivot, the rear end part of the right rear swing rod is provided with a locking pin, the front end part of the right rear swing rod is a driving part, a plurality of locking holes are distributed on the right rear connecting rod along the length direction of the right rear connecting rod, the right middle connecting rod is also provided with a locking hole, and the locking pin is inserted into one locking hole on the right rear connecting rod and the locking hole on the right middle connecting rod when the right rear locking mechanism is in a locking working state; and when the right rear locking mechanism is in an unlocking working state, the locking pin is separated from the locking hole on the right rear connecting rod.

7. The stroller of claim 6, wherein: the synchronous linkage mechanism comprises a synchronous linkage mechanism which comprises a synchronous linkage mechanism,

8. The stroller of claim 7, wherein: the unlocking button set up in left fixing base along left and right sides direction with sliding, the unblock handle set up in right fixing base along left and right sides direction with sliding, the left and right sides synchronous connecting rod with the unlocking button the unblock handle connect as an organic wholely rigidly.

9. The stroller of claim 6, wherein: the synchronous linkage mechanism comprises a synchronous linkage mechanism which comprises a synchronous linkage mechanism,

when the unlocking button is pressed, the unlocking button slides relative to the right fixing seat, or the unlocking handle is pulled to slide relative to the left fixing seat, the driving part of the right front swing rod and the driving part of the right rear swing rod are respectively contacted with the button guide inclined plane to further drive the right front swing rod and the right rear swing rod to rotate, meanwhile, the driving part of the left front swing rod and the driving part of the left rear swing rod are also respectively contacted with the handle guide inclined plane to further drive the left front swing rod and the left rear swing rod to rotate, so that the left front locking mechanism, the left rear locking mechanism, the right front locking mechanism and the right rear locking mechanism are synchronously switched from a locking working state to an unlocking working state.

10. The stroller of claim 9, wherein: the unlocking button set up in right side fixing base along left-right direction with sliding, the unblock handle set up in left side fixing base along left-right direction with sliding, left-right synchronization connecting rod with the unlocking button the unblock handle connect as an organic wholely rigidly.

11. A stroller according to claim 8 or 10, wherein: the middle transverse connecting rod is tubular, and the left and right synchronous connecting rods are positioned in the middle transverse connecting rod.

12. The stroller of claim 8 or 10, wherein: the button guide inclined plane is inclined relative to the sliding direction of the unlocking button, the handle guide inclined plane is inclined relative to the sliding direction of the handle, and the button guide inclined plane and the handle guide inclined plane are inclined in the same direction.

13. The stroller of claim 1, wherein: the seat comprises a seat body and a seat supporting upright rod, and the seat body is connected with the seat supporting upright rod; under the working state of a single seat, the lower end part of the seat supporting upright rod is detachably connected with the middle frame; in the double-seat working state, the lower end part of the seat supporting upright rod on one seat is detachably connected with the front frame, and the lower end part of the seat supporting upright rod on the other seat is detachably connected with the rear frame.

14. The stroller of claim 13, wherein: under the working state of a single seat, the lower end part of the seat supporting upright stanchion is detachably connected with the left middle connecting rod and the right middle connecting rod; under the working state of double seats, the lower end part of the seat supporting upright rod on one seat is detachably connected with the left front connecting rod and the right front connecting rod, and the lower end part of the seat supporting upright rod on the other seat is detachably connected with the left rear connecting rod and the right rear connecting rod.

15. The stroller of claim 13, wherein: in the working state of a single seat, an upright rod middle locking mechanism is arranged between the lower end part of the seat supporting upright rod and the middle frame, the upright rod middle locking mechanism prohibits the lower end part of the seat supporting upright rod from being detached from the middle frame in the locking working state, and the upright rod middle locking mechanism permits the lower end part of the seat supporting upright rod to be separated from the middle frame after being detached in the unlocking working state; under the working state of double seats, a seat is provided with a seat support pole lower end and a front frame between which a pole front locking mechanism is arranged, the pole front locking mechanism prohibits the seat support pole lower end from being detached from the front frame under the locking working state, the pole front locking mechanism permits the seat support pole lower end to be detached from the front frame under the unlocking working state, the seat support pole lower end and the rear frame between which a pole rear locking mechanism is arranged on another seat, the pole rear locking mechanism prohibits the seat support pole lower end from being detached from the rear frame under the locking working state, and the pole rear locking mechanism permits the seat support pole lower end to be detached from the rear frame under the unlocking working state.

16. The stroller of claim 1, wherein: the seat comprises a seat body and a seat supporting upright rod, and the seat body is connected with the seat supporting upright rod; in the single seat working state, the lower end part of the seat supporting upright rod is pivotally connected with the middle frame, a rotation-stopping middle locking mechanism is arranged between the lower end part of the seat supporting upright rod and the middle frame, the lower end part of the seat supporting upright rod and the middle frame are forbidden to pivot when the rotation-stopping middle locking mechanism is in the locking working state, the lower end part of the seat supporting upright rod is allowed to rotate relative to the middle frame when the rotation-stopping middle locking mechanism is in the unlocking working state, and the seat and the middle frame are in the folding state; in a double-seat working state, the lower end part of the seat supporting upright rod on one seat is pivotally connected with the front frame, a rotation-stopping front locking mechanism is arranged between the lower end part of the seat supporting upright rod and the front frame, the lower end part of the seat supporting upright rod and the front frame are forbidden to pivot when the rotation-stopping front locking mechanism is in a locking working state, the lower end part of the seat supporting upright rod is allowed to rotate relative to the front frame when the rotation-stopping front locking mechanism is in an unlocking working state, and the seat and the front frame are in a folding state; on another seat the lower tip of seat support pole setting with back frame pivot ground connect, the seat support pole setting the lower tip with the back frame between be provided with the locking mechanical system after the spline locking mechanical system under the locking operating condition, forbid the seat support pole setting the lower tip with back frame pivot, the spline after the locking mechanical system be in unblock operating condition under, allow the seat support pole setting the lower tip for the back frame rotate, the seat with the back frame be in fold condition.