CN113142869B - A chair that can tilt forward and backward - Google Patents
A chair that can tilt forward and backwardInfo
- Publication number
- CN113142869B CN113142869B CN202110569795.8A CN202110569795A CN113142869B CN 113142869 B CN113142869 B CN 113142869B CN 202110569795 A CN202110569795 A CN 202110569795A CN 113142869 B CN113142869 B CN 113142869B
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- CN
- China
- Prior art keywords
- seat
- frame
- chair
- base
- backward
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Supports for the head or the back
- A47C7/40—Supports for the head or the back for the back
- A47C7/46—Supports for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
- A47C7/462—Supports for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/02—Seat parts
- A47C7/28—Seat parts with tensioned springs, e.g. of flat type
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
本发明公开了一种可前后倾仰的椅子，包括底座、椅座、椅背架、翻转架，所述椅座的前端、后端分别和翻转架的上端、椅背架的中段铰接，所述底座的前端、后段分别和翻转架的下端、椅背架的前端铰接；所述椅背架的后端固定连接椅背框；所述底座后段的底部固定连接椅脚架；所述底座由前端至后端向下倾斜，使得椅座与底座之间的垂直间隙由前至后逐渐增大；所述椅背架由前端至后端向上倾斜，使得椅座和椅背架之间的垂直间隙由前至后逐渐减小；所述椅座用于固定安装坐垫。本发明的有益效果在于，可以提高舒适度。
The present invention discloses a chair that can tilt forward and backward, comprising a base, a seat, a backrest frame, and a tilting frame. The front and rear ends of the seat are hinged to the upper end of the tilting frame and the middle section of the backrest frame, respectively. The front and rear ends of the base are hinged to the lower end of the tilting frame and the front end of the backrest frame, respectively. The rear end of the backrest frame is fixedly connected to the backrest frame. The bottom of the rear end of the base is fixedly connected to the chair leg frame. The base is tilted downward from the front to the rear end, such that the vertical gap between the seat and the base gradually increases from front to back. The backrest frame is tilted upward from the front to the rear end, such that the vertical gap between the seat and the backrest frame gradually decreases from front to back. The seat is used to fix and install a seat cushion. The present invention has the beneficial effect of improving comfort.
Description
Technical Field
The invention relates to a chair, in particular to a chair capable of tilting forwards and backwards.
Background
At present, office chairs used in office occasions or leisure chairs used in daily leisure have the functions of leaning forward and backward, locking the leaning angle and adjusting the leaning tightness.
For example, prior art publication CN109393798a discloses a wire control device for adjusting the pitch and tightness of a seat back frame. The wire control device for adjusting the leaning and leaning of the back frame of the seat and the tightness comprises a back frame leaning and leaning adjusting wire control device and a back frame tightness adjusting wire control device which are arranged in the seat, wherein the back frame leaning and leaning adjusting wire control device comprises a back frame connecting tail plate, a leaning and leaning adjusting mechanism, a leaning and leaning pull rope and a leaning and leaning adjusting handle, one end of the leaning and leaning pull rope is connected with the leaning and leaning adjusting mechanism, the other end of the leaning pull rope is connected with the leaning and leaning adjusting handle, and the back frame tightness adjusting wire control device comprises a tightness adjusting control rod, a first tightness pull rope, a second tightness pull rope and a tightness adjusting mechanism. This patent application designs back of body frame and leans on adjustment drive-by-wire device and back of body frame elasticity adjustment drive-by-wire device, realizes back of body frame and leans on, the seat utensil of elasticity regulation through the drive-by-wire, through simple mechanical mechanism, the user can easily adjust back of body frame to comfortable angle.
And patent application for optimizing the tightness of the prior art in adjustment, wherein the publication number of the patent application is CN111528639A, which discloses a seat connecting device with an adjustable backrest, and belongs to the technical field of swivel chairs. The chair back tightness control device comprises a chair back tightness control assembly, wherein the chair back tightness control assembly comprises a control handle, a universal joint, a transmission rod, a first bevel gear, a second bevel gear, a lifting piece, a mounting seat of the lifting piece and a tightness adjusting rod, wherein the control handle is regulated and controlled in a rotating mode. The universal joint is replaced by the original pull rope to drive, response timeliness of force transmission of the chair back is improved when the chair back tightness is regulated, accuracy and operability of chair back tightness regulation are improved, meanwhile, the force arm is effectively improved by adopting a pull rope regulation mode, the force transmission of the chair back is improved when the chair back is regulated, the requirement on the force transmission is improved, the force requirement on a user is reduced, the possibility of damage of an adjusting mechanism caused by overlarge input force when the chair back is regulated is effectively reduced, and therefore the service life of the chair back is prolonged.
First, both of the above patent applications use knobs for adjusting pitch tightness, and although stepless adjustment can be achieved by rotating the knobs, the adjustment is finer, but this adjustment has three drawbacks:
Firstly, the tightness degree is troublesome in large-span adjustment, a user cannot directly span the adjustment, but needs to repeatedly rotate the knob to adjust gradually, the use is troublesome, and the fineness of the adjustment mode and the rotation degree of the knob are in direct proportion, so that the contradiction exists between the performance and the use convenience.
Second, the tightness of the knob is proportional to the tightness of the tilting back and forth, and the force required for rotating the knob is gradually increased during the adjustment process from tightness to tightness of the user, so that the user experience is poor.
Thirdly, the tightness of the two patent applications is adjusted no matter how tightness is, the tightness is gradually tightened in the process of leaning back, namely damping is gradually increased, the effect similar to braking is achieved, the stopping feeling caused by stopping when leaning back to the maximum angle is reduced, but damping is always existing in the process of leaning back and is in linear relation, and when a user is relaxed, such as leaning back and forth (swinging back and forth) in a reciprocating manner, particularly under the condition of high swinging speed, ideal experience is that damping is smaller (looser) in the first half of leaning back and even no damping at all, and damping is larger (tighter) in the second half of leaning back to achieve the braking effect. The two tightness devices in the prior art cannot realize the experience, if the tightness devices are loosely regulated, the effect of braking is poor due to the fact that the tightness devices are quickly tilted forwards and backwards, the feeling of a pause when the tightness devices are tilted backwards to the maximum angle is strong, and if the tightness devices are tightly regulated, the effect of braking can be ensured, but the damping of the tilting forwards and backwards is large, and the tilting forwards and backwards cannot be quickly performed.
Secondly, in the two patent applications, the locking of the front and rear tilting angle is realized by the arc-shaped plate-shaped structure in a plug-in matching mode, the arc-shaped plate-shaped structure occupies the space in the vertical direction, so that a structural gap is hardly formed between the seat positioned above and the seat positioned below, the seat is basically directly supported on the bottom surface of the seat, the seat becomes a rigid structure, when a user sits on the seat cushion, the pressure born by the seat gradually increases from the edge to the center, the downward recess is in a shape-like deformation trend, the seat has no deformation buffer margin, the texture of the center of the seat cushion is harder, the comfort level is poor, and the seat is easy to clamp under the conditions of aging deformation and the like after long-time use. In addition, in the prior art CN111528639a, the seat (seat connector) and the base (tray) are connected, so the seat cannot be tilted back and forth synchronously, making the user experience poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a chair capable of tilting forwards and backwards, and the comfort level can be improved.
The invention is realized by the following technical scheme.
The chair capable of tilting forwards and backwards comprises a base, a chair seat, a chair back frame and a turnover frame, wherein the front end and the rear end of the chair seat are respectively hinged with the upper end of the turnover frame and the middle section of the chair back frame, and the front end and the rear section of the base are respectively hinged with the lower end of the turnover frame and the front end of the chair back frame;
The seat back frame is inclined upwards from the front end to the rear end, so that the vertical gap between the seat back and the seat back frame is gradually reduced from front to rear, and the seat back is used for fixedly mounting a seat cushion.
As a further improvement of the invention, the base is of a hollow box structure, the left side wall and the right side wall of the base are respectively provided with first hinge points at the upper parts of the rear sections, the chair back frame is provided with two chair back frames, the upper parts of the front ends of the two chair back frames are respectively hinged with the two first hinge points, a swinging rod which extends leftwards and rightwards is connected between the lower parts of the front ends of the two chair back frames, and the left side wall and the right side wall of the base are respectively provided with an arc-shaped groove which allows the swinging rod to pass through and limits the front-back swinging range of the swinging rod.
As a further improvement of the invention, a main push rod extending forwards and backwards is arranged in the base, the front end of the main push rod slides through a first lantern ring structure arranged in the base, the rear end of the main push rod is movably connected with the swinging rod, the main push rod is sleeved with a first elastic compression structure, and the two ends of the main push rod are respectively supported on the first lantern ring structure and the swinging rod.
As a further improvement of the present invention, the back frames are unfolded laterally from front end to rear end such that the left-right spacing between the two back frames is gradually increased from front to rear, and the width of the back frame is defined.
As a further improvement of the invention, the chair back frame comprises two chair back connecting sections fixedly connected to the rear end of the chair back frame and along the extending direction of the chair back connecting sections, two side frames extending upwards from the rear ends of the two chair back connecting sections, a top frame transversely extending and folding from the top ends of the two side frames, and a bottom frame connected between the bottom ends of the two side frames, wherein the side frames incline forward from the bottom to the middle and backward from the middle to the top, the top frame inclines backward from two sides to the middle, and a frame structure formed by encircling the top frame, the top frame and the two side frames is used for fixing the back of the chair.
As a further improvement of the invention, the chair back connecting section and the outer side edge from the bottom end to the middle part of the side frame are fixedly connected with an armrest fixing frame which extends along the extending direction of the chair back connecting section and the side frame, and the top end of the armrest fixing frame is fixedly connected with an armrest which extends forwards.
As a further improvement of the invention, the chair seat is in a flat plate-shaped structure, the rear ends of the left side and the right side of the chair seat are respectively provided with a third hinge point, the middle section of the chair back frame is provided with a bracket extending to the side of the chair back frame, and the end parts of the two brackets are hinged with the two third hinge points.
As a further improvement of the invention, the front ends of the left side wall and the right side wall of the base are respectively provided with a second hinge point, the front ends of the left side and the right side of the seat are respectively provided with a fourth hinge point, the two turnover frames are arranged, and the lower ends and the upper ends of the turnover frames are respectively hinged with the second hinge point and the fourth hinge point.
As a further improvement of the invention, the top surface of the seat is fixed with a cushion supporting plate, the area of the cushion supporting plate is larger than that of the seat, the bottom surface of the cushion supporting plate is provided with a mounting surface formed by inward recessing, the seat is embedded into the mounting surface, and the top surface of the cushion supporting plate is used for fixing the cushion.
As a further improvement of the invention, the cushion support plate and the whole front end of the cushion are curved downwards in an arc shape.
The invention has the beneficial effects that:
The invention sets the base, the back frame, the seat and the roll-over frame into the whole structure of the inverted triangle, so that a larger gap is formed between the seat positioned above and the base and the back frame positioned below, the maximum range of the back frame can be increased, the seat is provided with a space which is deformed and sunken downwards, a certain buffer margin is provided for a user when the user sits down, and the comfort is improved.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, to facilitate understanding of the objects and advantages of the present invention, wherein:
Fig. 1 is a schematic structural view of a base and a seatback frame according to embodiment 1;
FIG. 2 is a schematic view of the base of embodiment 1;
FIG. 3 is a schematic view showing the structure of the inside of the base of embodiment 1;
fig. 4 is a schematic structural view of the swing lever, the main push rod and the auxiliary push rod according to embodiment 1;
FIG. 5 is a schematic view of the structure of the base plate of the base of embodiment 1;
fig. 6 is a schematic structural view of the first locking mechanism, the second locking mechanism, and the base of embodiment 1;
Fig. 7 is a schematic structural view of the first locking mechanism and the second locking mechanism of embodiment 1 in a state of being respectively engaged with the main push rod and the locking seat;
FIG. 8 is a schematic view showing the structure of a chair according to embodiment 2, which can be tilted back and forth;
FIG. 9 is a schematic side view of a base, a back rest, a seat, and a roll-over stand of embodiment 2;
FIG. 10 is a schematic view of a chair according to embodiment 2 in a forward leaning state;
FIG. 11 is a schematic view of a chair according to embodiment 2 in a reclined state;
FIG. 12 is a schematic view of a chair back frame according to embodiment 2;
fig. 13 is a schematic view showing the structure of a seat support plate and a seat cushion according to embodiment 2.
Detailed Description
The invention is described in further detail below with reference to the drawings and the examples.
The terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible in this specification are defined with respect to the configurations shown in the drawings, and the terms "inner" and "outer" refer to the relative concepts of the terms toward or away from the geometric center of a particular component, respectively, and thus may be changed accordingly depending on the location and use state of the component. These and other directional terms should not be construed as limiting terms.
Embodiment case 1:
Referring to fig. 1 and 2, a chair back adjusting mechanism comprises a base 1 and a chair back frame 2, wherein the base 1 is in a box-shaped structure and is used for fixedly connecting a chair seat, the two chair back frames 2 are symmetrically arranged at the rear sections of the left side wall and the right side wall of the base 1 respectively, specifically, the upper part of the front end of the chair back frame 2 is hinged with the base 1 through a rotating shaft penetrating through the side wall of the base 1, a swinging rod 2-1 extending leftwards and rightwards is connected between the lower parts of the front ends of the two chair back frames 2, the left side wall and the right side wall of the base 1 are provided with arc-shaped grooves 1-h allowing the swinging rod 2-1 to pass through, and the foremost end and the rearmost end of the arc-shaped grooves 1-h limit the range of the swinging rod 2-1 to swing forwards and backwards.
In the present application, the front, rear, left and right described above and below are referred to as chairs, and the direction in which the chairs face forward is defined as the front, and the direction in which the chairs face backward is defined as the rear.
Referring to fig. 3 and 4, a portion of the swinging rod 2-1 located in the base 1 is slidably sleeved with a sleeve 2-11, the sleeve 2-11 is fixedly connected with a main push rod 61, when the chair back frame 2 leans back, the swinging rod 2-1 correspondingly swings forwards within the constraint range of the arc-shaped groove 1-h, the sleeve 2-11 passively rotates around the axis of the swinging rod 2-1 to drive the main push rod 61 to linearly move along the front-back direction, and the leaning back of the chair back frame 2 is driven by the leaning back of a user.
Referring to fig. 3 and 4, the front section of the main push rod 61 is provided with a plurality of first locking nodes 6-a at intervals along the front-rear direction, the plurality of first locking nodes 6-a occupy 1/4-1/3 of the total length of the section of the main push rod 61, and the section is the length of the main push rod 61 which is adjusted by moving back and forth and corresponds to the arc length of the arc-shaped groove 1-h of the base 1. A movable first locking mechanism is arranged in the base 1, and the first locking mechanism can be engaged with or separated from a first locking node 6-A positioned in the movable range of the first locking mechanism. The first locking mechanism prevents the main push rod 61 from moving forward and backward when engaged, thereby locking the reclining angle of the back frame 2, and the main push rod 61 can freely move forward and backward when disengaged, thereby enabling the reclining angle of the back frame 2 to be adjusted. When the first locking mechanism is engaged with the first locking node 6-a located at the foremost and rearmost ends, the state of the seatback frame 2 is foremost and rearmost.
Referring to fig. 3 and 4, a set of locking seats 73, a second elastic compression structure 72, and a movable second locking mechanism are respectively provided in the base 1 and located at the left and right sides of the main push rod 61, and the front and rear ends of the second elastic compression structure 72 are respectively supported on the locking seats 73 and the swing rod 2-1, which are made of elastic materials, and can be compressed and exert elastic force when receiving the force of front and rear extrusion of the locking seats 73 and the swing rod 2-1. The second locking mechanism functions similarly to the first locking mechanism and can be engaged with or disengaged from the locking seat 73. When the swing lever 2-1 is engaged, the second elastic compression structure 72 is pressed by the locking seat 73 and the swing structure to be in a compressed state, thereby applying an elastic force to the swing lever 2-1, and when the swing lever 2-1 is disengaged, the second elastic compression structure 72 is not pressed, and thus does not apply an elastic force to the swing lever 2-1.
From the viewpoints of the structural shape and the movement mode, the main push rod 61 is of an elongated structure extending forward and backward and linearly moving forward and backward along the length direction, and based on this characteristic, the main push rod 61 basically has only a space requirement for the forward and backward length of the base 1, but has a lower space requirement for the up and down height, and only needs to meet that no mechanical interference occurs. Therefore, the base 1 may be configured in a structure shape to have a certain width (to satisfy the left-rear span of the main push rod 61 and the second elastic compression structure 72 and the locking seat 73 located at both sides thereof), a certain length (to satisfy the length of the main push rod 61 and the moving range thereof), and a flat box structure with a narrower thickness (only to satisfy the main push rod 61, the second elastic compression structure 72 and the locking seat 73 without mechanical interference in the upper and lower spaces), so that on one hand, more structural layout space can be reserved for other components (such as a seat and a cushion) of the chair, and on the other hand, the seat, the cushion and other structures above the base 1 are easier to cover and more attractive.
The two sets of locking seats 73 and the second elastic compression structure 72 are used for adjusting the tightness of the back frame 2 when the back frame is reclined, and the tightness of the back frame is adjustable in two steps by controlling whether the second locking mechanism is engaged with the locking seats 73.
Referring to fig. 3 and 4, a first collar structure 63 is disposed in the front section of the base 1, and the front end of the main push rod 61 slides through the first collar structure 63, and the collar structure provides support and guiding function for the front section of the main push rod 61, so that the movement direction of the main push rod 61 can be kept along the axial direction, and radial deflection or movement during the forward and backward movement of the main push rod 61 can be avoided. The part of the main push rod 61 between the first sleeve ring structure 63 and the swinging rod 2-1 is sleeved with a first elastic compression structure 62, the front end and the rear end of the first elastic compression structure 62 are respectively supported on the first sleeve ring structure 63 and the swinging rod 2-1, in the forward swinging process of the swinging rod 2-1, the first elastic compression structure 62 is compressed by being extruded by the first sleeve ring structure 63 and the swinging rod 2-1, and then the first elastic compression structure 62 applies elastic force to the swinging rod 2-1. In addition, the first elastic compression structure 62 is matched with two second elastic compression structures 72 to enable the back leaning of the chair back frame 2 to have three-gear tightness, the first elastic compression structure 62 always plays a role in the back and forth swinging process of the swinging rod 2-1, namely the tightness gear provided by the first elastic compression structure 62 is resident, and the two tightness gears provided by the two second elastic compression structures 72 are selectable based on the engagement or the separation of the second locking mechanism and the locking seat 73.
Referring to fig. 3 and 4, the locking seats 73 are provided with a plurality of second locking nodes 7-a spaced apart in the front-rear direction, and the second locking mechanism may be engaged with or disengaged from the second locking nodes 7-a located in the movable range thereof, and the second locking mechanism is engaged with a different second locking node 7-a, so that the compression amount of the second elastic compression structure 72 is different when the swing lever 2-1 swings, and thus the elastic force applied to the swing lever 2-1 by the second elastic compression structure 72 is also different. Thus, in summary, the two locking brackets 73 provide two adjustable high tightness steps of recline based on the combination or separation of the second locking mechanism and the locking bracket 73, which second locking node 7-a of the second locking mechanism and the locking bracket 73 is engaged, dividing the high tightness step into a plurality of selectable low tightness steps, and then adjusting the degree of recline tightness of the back rest 2 more finely.
The second locking mechanism can be engaged with the second locking node 7-a at the foremost end of the locking seat 73 when the swing lever 2-1 is located at the rearmost end of the forward and backward swing range thereof and the second elastic compression structure 72 is in the natural state. With reference to the process of swinging the swing rod 2-1 forward from the rearmost end to the foremost end of the swing range, when the second locking mechanism is engaged with the foremost second locking node 7-a, the second elastic compression structure 72 is always in a compressed state, and always applies an elastic force to the swing rod 2-1, the magnitude of which is proportional to the amplitude of forward swinging of the swing rod 2-1. When the second locking mechanism is engaged with the other second locking node 7-a, the swing rod 2-1 swings forward by a certain extent and then starts to press the second elastic structure with the locking seat 73, i.e. the swing rod 2-1 swings forward by a certain extent and then receives the gradually increasing elastic force applied by the second elastic compression structure 72. Based on this, the two locking seats 73 are combined with the second locking nodes 7-a in different positions, and the degree of tightness during recline can be differentiated, but the degree of tightness can be adjusted to be approximately the same when approaching the maximum angle of recline.
For example, the forefront second locking node 7-A is set to be a No. 1 gear, a No. 2 gear, a No. 3 gear and the like are sequentially arranged from front to back, two combination modes are adopted, wherein the No. 2 gear and the No. 4 gear are respectively selected by two locking seats 73 in the first combination mode, the No. 3 gear is selected in the second combination mode, when the back frame 2 reaches the maximum backward angle (the swinging rod 2-1 swings to the forefront), the damping (generated by the elastic force) of the two combination modes is approximately the same, but the damping change condition is different in the backward swinging process, the elastic force of the No. 2 gear is firstly inserted in the first combination mode, the elastic force of the No. 2 gear is inserted in the second combination mode, the elastic force of the No. 4 gear is inserted in the second combination mode, the elastic force of the No. 3 gear is inserted in the second combination mode, and therefore, the mean change amplitude of the damping is smaller in the first combination mode, and the mean change amplitude of the damping is larger in the second combination mode.
In summary, on the premise that the sum of the two gears is the same, the larger the span of the two gears is, the earlier the damping intervention time is, the more stable the damping is on the whole, the smaller the span of the two gears is, the later the damping intervention time is, and the more intense the damping is on the whole. Therefore, the user can freely select a combination of two gears, and adjust the tightness to the most appropriate state.
Referring to fig. 3 and 4, the locking seat 73 is in a semi-cylindrical shape in structure, the rear end of the locking seat is provided with a second collar structure 731, two auxiliary push rods 71 respectively corresponding to the locking seat 73 are arranged in the base 1, the auxiliary push rods 71 extend along the front-rear direction, the rear ends of the auxiliary push rods are fixedly connected with the sleeve 2-11, the front ends of the auxiliary push rods slide through the second collar structure 731, the second elastic compression structure 72 is sleeved outside the locking seat 73 and is supported between the second collar structure 731 and the sleeve 2-11, and the auxiliary push rods 71 can play a role of a framework when the swing rod 2-1 swings forwards and the second elastic compression structure 72 is compressed, so that the second elastic compression structure 72 is prevented from bending along the radial direction of the auxiliary push rods 71, and the auxiliary push rods are more stable and reliable. In addition, the front end of the auxiliary push rod 71 is screw-coupled with a nut 711 which abuts against the second collar structure 731 as a stopper structure for preventing the sliding from the second collar structure 731, and the auxiliary push rod 71 can pull the locking seat 73 back to be reset when the second locking mechanism is not engaged with the locking seat 73 and the swing lever 2-1 swings backward.
Referring to fig. 3, 5, 6, and 7, a support 11 is provided between the main push rod 61 and the two sub push rods 71, and the support 11 and the base 1 are integrally formed as a single body, formed by upwardly protruding a bottom plate of the base 1, and extending in the front-rear direction. The top of the support 11 is provided with a fixed shaft 12 extending back and forth, and the front and back ends of the top of the support 11 are respectively provided with a supporting structure 111 for supporting the two ends of the fixed shaft 12 and suspending the fixed shaft 12. The second locking mechanism includes a second swing arm 91, a second pull wire 93, and a second elastic restoring member 94. The second swing arm 91 spans the locking seat 73, one end of the second swing arm is rotatably sleeved on the fixed shaft 12, the other end of the second swing arm is provided with a second locking structure 92, the second locking nodes 7-A are arranged on one side, close to the side wall of the base 1, of the locking seat 73 at intervals along the front-rear direction, the second locking structure 92 and the second locking nodes 7-A are arranged into a clamping tongue and a clamping groove, and the second swing arm are connected in a clamping fit mode. The second pull wire 93 penetrates through the top plate of the base 1, one end of the second pull wire is fixedly connected with the second locking structure 92, and the other end of the second pull wire is connected with a handle which can be installed on the base or the chair seat. The second elastic restoring member 94 is a torsion spring, and is sleeved on the fixed shaft 12, one end of the second elastic restoring member is supported on the support 11, and the other end of the second elastic restoring member is supported on the second swing arm 91. The structure of the handle is the same as the tilt adjustment handle of applicant's prior application publication number CN109393798a and will not be described in detail here. Pulling the handle second pull wire 93 can pull the second locking structure 92 upwards so as to separate from the second locking node 7-A, after a certain angle of pulling, the handle is clamped so as to keep the separation state of the second locking structure 92 and the second locking node 7-A, and after the handle is pulled back so as to release the clamping state, under the action of the second elastic reset piece 94, the second swing arm 91 resets and rotates so as to enable the second locking structure 92 to be clamped and matched with the second locking node 7-A.
The second locking mechanism is operated in a flexible and simple manner by pulling the handle to control the engagement or disengagement of the second locking structure 92 and the second locking node 7-a. When the swing lever 2-1 is positioned at the rearmost end of the swing range, the handle is pulled and clamped so that the two second locking structures 92 are separated from the locking seats 73, then the swing lever 2-1 swings forwards by leaning backwards, and during the forward swing of the swing lever 2-1, the handle can be pulled reversely at any time so that the second locking structures 92 and the second locking nodes 7-A are engaged to lock the gear.
Referring to fig. 3, 5, 6, and 7, the first locking mechanism and the second locking mechanism on the left or right share the same dead axle 12, and the first locking mechanism includes a first swing arm 81, a first stay 83, and a first elastic restoring member 84. One end of the first swing arm 81 is rotatably sleeved on the fixed shaft 12, the other end of the first swing arm 81 is provided with a first locking structure 82 which can be jointed with the first locking node 6-A, and the first swing arm 81 is rotatably sleeved on one end of the fixed shaft 12 to be in a forked structure so as to avoid the second swing arm 91, so that the first swing arm 81 and the second swing arm 91 can be simultaneously rotatably sleeved on the fixed shaft 12. The first locking structure 82 and the first locking node 6-a are also provided as snap-fit tongues and grooves. The top of the first collar structure 63 has a support plate structure 631 extending forward above the first locking structure 82, and the first pull wire 83 penetrates through the top plate of the base 1 and the support plate structure 631, and one end of the first pull wire is fixedly connected to the first locking structure 82, and the other end of the first pull wire is connected to a handle. The first elastic restoring member 84 is a compression spring, which is sleeved outside the first pull wire 83, and both ends of which are supported on the first locking structure 82 and the support plate structure 631, respectively. The operation is the same as the second locking mechanism and will not be described in detail here.
The supporting seat 13 is arranged between the two supports 11 and right below the first locking mechanism, the supporting seat 13 and the base 1 are of an integrated structure, the bottom plate of the base 1 is upwards protruded to form the supporting seat for supporting the front section of the main push rod 61, and the upward supporting seat 13 is applied with force to balance the downward force applied by the first locking structure 82 to the main push rod 61, so that the rear end of the main push rod 61 is prevented from being lifted upwards, and the swing rod 2-1 cannot be blocked.
The slide rail 14 extending back and forth is arranged in the base 1, the slide rail 14 and the base 1 are of an integrated structure, the bottom plate of the base 1 protrudes to form, two sides of the slide rail 14 support two sides of the locking seat 73, the locking seat 73 can slide back and forth along the slide rail 14, and the slide rail 14 plays a limiting role on the locking seat 73 so as to avoid lateral deviation in the back and forth sliding process.
The middle part of the locking seat 73 is provided with a guide groove 73-h which is penetrated up and down and extends forwards and backwards, the bottom plate of the base 1 is provided with a guide rod 15 which is formed by upward protrusion at the position of the middle part of the sliding rail 14, and the guide rod 15 is inserted into the guide groove 73-h to play a role in guiding the locking seat 73 to slide forwards and backwards. In addition, when the guide rod 15 is positioned at the front end and the rear end of the guide groove 73-h, the second locking mechanism can be engaged with the second locking node 7-A at the foremost end and the rearmost end of the locking seat 73, and the guide rod 15 and the guide groove 73-h limit the front-rear sliding range of the locking seat 73, so that the second locking node 7-A which can be engaged with the second locking mechanism is always arranged in the movable range of the second locking mechanism.
Embodiment case 2:
Referring to fig. 8, a chair capable of tilting forward and backward comprises a base 1, a seat 3, a chair back frame 2 and a roll-over stand 5, wherein the front end and the rear end of the seat 3 are respectively hinged with the upper end of the roll-over stand 5 and the middle section of the chair back frame 2, the front end and the rear section of the base 1 are respectively hinged with the lower end of the roll-over stand 5 and the front end of the chair back frame 2, the rear end of the chair back frame 2 is fixedly connected with a chair back frame 4, and the bottom of the rear section of the base 1 is fixedly connected with a chair foot rest. The structure of the base 1 and the chair back frame 2 is the same as that of the embodiment 1, and at least the main push rod 61, the first collar structure 63 and the first elastic compression structure 62 are arranged in the base 1, so that the chair has the function of leaning forward and resetting after leaning backward.
Referring to fig. 8 and 9, the base 1, the back frame 2, the seat 3 and the roll-over stand 5 form a planar four-bar structure, the seat 3 is used for fixedly mounting the cushion 32, and referring to fig. 10 and 11, when the back frame 2 leans back, the seat 3 correspondingly rolls back synchronously, so that the variation range of the included angle between the cushion 32 and the back frame 4 is small, the sitting posture of a user can be basically kept unchanged in the forward and backward leaning process, and particularly, when the user swings back and forth repeatedly in a free relax manner, the waist is not used for turning back, and the comfort of the chair is improved.
The base 1 is inclined downwards from front end to rear end, so that the vertical gap between the seat 3 and the base 1 is gradually increased from front to rear, and the back frame 2 is inclined upwards from front end to rear end, so that the vertical gap between the seat 3 and the back frame 2 is gradually reduced from front to rear.
The pressure applied to the seat 3 when the user sits on the seat cushion gradually increases from the edge to the center, and under the effect of such pressure distribution, the seat 3 tends to be deformed in a shape of a depression with the center depressed downward. In the prior art, since there is almost no gap between the seat 3 and the base 1, under the direct supporting action of the base 1, even if the cushion 32 is elastic, the degree to which the cushion 32 is pressed is gradually increased from the edge to the center under the condition that the seat 3 is completely rigid and has no deformation buffering margin, so that the center of the cushion 32 is hard in texture and poor in comfort. In the application, the rest parts of the chair seat 3 are suspended except the front end and the rear end which are respectively supported by the roll-over stand 5 and the back frame 2, so that a slightly deformed space is provided for the chair seat 3, a good buffer effect is achieved when a user sits down, and the comfort is improved, especially for the user with larger weight.
In the prior art, because almost no gap exists between the seat 3 and the base 1, the backward leaning range of the chair back frame 2 is greatly limited in order to avoid mechanical interference, and the chair back frame 2 is easy to be blocked and interfered when the chair back frame is partially aged and deformed after long-time use. Compared with the prior art, the application has the advantages that as the base 1 and the seat 3 have a large surplus clearance, no adverse effect is generated no matter the amplitude of forward and backward tilting or the local aging deformation is used for a long time.
In addition, the overall structure formed by the chair seat 3, the roll-over stand 5, the base 1 and the chair back frame 2 is triangular, so that the chair has better overall structural strength and structural stability.
Referring to fig. 9, for the seat 3, the roll-over stand 5, the base 1, and the back frame 2, a planar four-bar structure is formed, and both the back frame 2 and the roll-over stand 5 are provided in a bilaterally symmetrical relationship. The left side wall and the right side wall of the base 1 are respectively provided with a first hinge point J1 at the upper part of the rear section, the upper parts of the front ends of the two chair back frames 2 are respectively hinged with the two first hinge points J1, the front ends of the left side wall and the right side wall of the base 1 are respectively provided with a second hinge point J2, the front ends of the left side and the right side of the chair seat 3 are respectively provided with a fourth hinge point J4, the lower ends and the upper ends of the two turnover frames 5 are respectively hinged with the two second hinge points J2 and the fourth hinge point J4, the chair seat 3 is in a tiled platy structure, the rear ends of the left side and the right side of the chair seat 3 are respectively provided with a third hinge point J3, the middle section of the chair back frame 2 is provided with a bracket 21 extending to the side of the chair back frame, and the ends of the two brackets 21 are hinged with the two third hinge points J3.
The roll-over stand 5 is substantially triangular in structure, and when the seatback frame 2 is tilted forward to the forefront (the swing lever 2-1 is located at the rearmost end of the swing range), the lower side edge of the roll-over stand 5 is flush with the bottom edge of the base 1.
The chair back frame 2 is unfolded from the front end to the rear end towards the side, so that the left-right distance between the two chair back frames 2 is gradually increased from front to back, an eight-shaped expansion structure is formed, the width of the chair back frame 4 is defined, namely, the width between the two chair back frames 2 is naturally transited to the width of the chair back frame 4, the structural transition of the two chair back frames is stable, the overall structural strength and stability of the chair back frames 2 and the chair back frame 4 are improved, and the chair back frame is attractive. The chair back frame 2 and the bracket positioned at the middle section of the chair back frame are of an integrated structure, and the arrangement of the bracket can enable the chair back frame 2 and the chair back frame 4 to fully avoid the rear end of the chair seat 3.
Referring to fig. 12, the back frame 4 includes two back connection sections 41 fixedly connected to the rear end of the back frame 2 and extending in the extending direction thereof, two side frames 42 extending upward from the rear ends of the two back connection sections 41, a top frame 43 extending laterally from the top ends of the two side frames 42 and folded, and a bottom frame 44 connected between the bottom ends of the two side frames 42, the side frames 42 being inclined forward from the bottom to the middle and backward from the middle to the top, the top frame 43 being inclined backward from the two sides to the middle, and a frame structure formed by surrounding the top frame 43, the top frame 43 and the two side frames 42 being used for fixing the back of the chair (not shown in the drawing). The shape change of the side frame 42 makes the back of the chair be the forward convex angle shape in the vertical direction, and the upper half of the back of the chair can support the back of the user well and prop up the waist, and the space between the lower half of the back of the chair and the cushion 32 can make the buttocks of the user go deep into the cushion 32 more backward, thereby making the user straighten the waist, avoiding the sitting posture of rickets of the user, and playing a corrective protection role on the waist, especially the lumbar vertebra. The shape of the top frame 43 is changed to enable the middle of the upper half of the back of the chair to be recessed inwards, so that the left side and the right side of the top frame are better in wrapping the neck of a user, and comfort is improved.
The chair back connecting section 41 and the outer side edge from the bottom end of the side frame 42 to the middle part are fixedly connected with an armrest fixing frame 45 extending along the extending direction of the armrest fixing frame 41, the top end of the armrest fixing frame 45 is fixedly connected with an armrest 46 extending forwards, and the armrest fixing frame 45 and the chair back frame 4 are fixedly connected, so that the armrest 46 can synchronously tilt forwards and backwards, and when a user uses the chair back, the trunk, the upper limbs and the lower limbs can synchronously tilt forwards and backwards.
Referring to fig. 13, the top surface of the seat 3 is fixed with a cushion support plate 31, the area of the cushion support plate 31 is larger than that of the seat 3, the bottom surface of the cushion support plate 31 is provided with a mounting surface 31-a formed by inward recessing, the seat 3 is embedded into the mounting surface 31-a, the top surface of the cushion support plate 31 is fixed with a cushion 32, and the cushion support plate 31 enlarges the mounting area, so that the cushion 32 can be selected to have a larger size, and a user can feel more comfortable. In addition, the entire front ends of the cushion support plate 31 and the cushion 32 are curved downward in an arc shape, so that the user's lower leg can hang down more naturally.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some technical features may be equivalently replaced, and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.
Claims (8)
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| CN113229663B (en) * | 2021-05-25 | 2022-02-15 | 安吉德卡办公系统有限公司 | Chair back adjusting mechanism |
| CN116035376A (en) * | 2022-12-07 | 2023-05-02 | 浙江润大柯泓家具有限公司 | Pin-connected panel seat structure |
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| CN215271602U (en) * | 2021-05-25 | 2021-12-24 | 安吉德卡办公系统有限公司 | Chair capable of inclining forwards and backwards |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6609755B2 (en) * | 2001-06-15 | 2003-08-26 | Hon Technology Inc. | Ergonomic chair |
| KR100903215B1 (en) * | 2008-10-10 | 2009-06-18 | 주식회사 시디즈 | Tiltable chair |
| CN106724257B (en) * | 2016-12-31 | 2019-10-25 | 浙江恒林椅业股份有限公司 | Chair frame and the chair for using the chair frame |
| CN107581811A (en) * | 2017-09-28 | 2018-01-16 | 大康控股集团有限公司 | One kind back of the body crankshaft base coordinated type seat |
| US10780003B2 (en) * | 2019-01-04 | 2020-09-22 | Haworth, Inc. | Adjustable ergonomic chair |
| CN112716193A (en) * | 2019-10-14 | 2021-04-30 | 黄子源 | Comfortable chair support with zero gravity adjusting function |
| CN111528639B (en) * | 2020-05-28 | 2024-11-19 | 安吉德卡办公系统有限公司 | A chair seat connection device with adjustable backrest |
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| CN215271602U (en) * | 2021-05-25 | 2021-12-24 | 安吉德卡办公系统有限公司 | Chair capable of inclining forwards and backwards |
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