Self-adaptive chair

Abstract

The utility model provides a self-adaptive chair and belongs to the technical field of chairs. The problem that only the inclination angle of a backrest of an existing chair can be adjusted is solved. The chair comprises a seat cushion and a backrest, wherein the backrest is movably arranged on the seat cushion through a three-connecting-rod structure; the three-connecting-rod structure comprises a first connecting rod, a second connecting rod and a third connecting rod, a rotating end A is arranged on the lower portion of the first connecting rod, and a rotating end B is arranged on the upper portion of the first connecting rod; a rotating end C is arranged at the lower part of the connecting rod II; a rotating end D is arranged at the upper part of the connecting rod III; two lower rotating shafts are fixedly arranged on the cushion, and two upper rotating shafts are fixedly arranged on the backrest; the rotating end A and the rotating end C are rotationally arranged on the two lower rotating shafts respectively, the rotating end B and the rotating end D are rotationally arranged on the two upper rotating shafts respectively, the second connecting rod is rotationally connected with the third connecting rod through a middle rotating shaft, and the middle rotating shaft is movably arranged in the middle of the first connecting rod and can horizontally move up and down relative to the first connecting rod. The utility model has the advantage that the backrest and the seat cushion are always kept in a nearly vertical state.

Description

Technical Field

[0001] The utility model belongs to the technical field of seats and relates to an adaptive chair. Background Art

[0002] There are many office chairs or ergonomic chairs on the market, which generally include a bracket, a seat cushion and a backrest arranged on the bracket. The backrest of the existing chair can adjust the tilt angle. The chair is provided with a self-locking gas spring, and the piston rod of the gas spring is extended and retracted to push the backrest to rotate, thereby adjusting the angle of the backrest.

[0003] Currently, this type of chairs on the market can only adjust the tilt angle of the backrest. However, in normal working state, the backrest and the seat cushion of the chair almost maintain a vertical angle. However, people of different body shapes have different distances between their backs and the backrest. Since the relative positions of these existing backrests and seat cushions are not adjustable, changing the tilt angle of the backrest cannot make the backrest fit the user's back completely.

[0004] What is lacking now is a chair which can keep the backrest and the seat cushion in a nearly vertical state during the adjustment process. Utility Model Content

[0005] The utility model aims to solve the above problems existing in the existing chairs and proposes a chair which can keep the backrest and the seat cushion in a nearly vertical state during the adjustment process.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] An adaptive chair comprises a support, and a seat cushion and a backrest arranged on the support, wherein the backrest is movably arranged on the seat cushion through a three-link structure;

[0008] The three-link structure comprises a first link, a second link and a third link. The first link is provided with a rotating end A at the bottom and a rotating end B at the top. The second link is provided with a rotating end C at the bottom and a rotating end D at the top. The seat cushion is fixed with two lower rotating shafts and the backrest is fixed with two upper rotating shafts.

[0009] The rotating end A and the rotating end C are respectively rotatably arranged on the two lower rotating shafts, the rotating end B and the rotating end D are respectively rotatably arranged on the two upper rotating shafts, the connecting rod 2 is rotatably connected with the connecting rod 3 through a central rotating shaft, and the central rotating shaft is movably arranged in the middle of the connecting rod 1 and can translate up and down relative to the connecting rod 1;

[0010] A gas spring is also arranged between the seat cushion and the backrest, the cylinder of the gas spring is rotatably arranged on the middle rotating shaft, the piston rod of the gas spring is rotatably arranged on the lower rotating shaft, and a locking structure is also arranged on the seat cushion for locking or unlocking the position of the gas spring piston rod.

[0011] In the above-mentioned adaptive chair, the locking structure includes a pull rope, a shifting block and a support. The piston rod of the gas spring is fixedly connected to the support, and the support is rotatably arranged on the lower rotating shaft. The shifting block is rotatably arranged on the support through a pin shaft. One end of the pull rope is fixedly connected to the shifting block. A thimble is arranged at the end of the piston rod of the gas spring. By pulling the pull rope, the shifting block rotates around the pin shaft so that the shifting block rotates to abut against the thimble and pushes the thimble to move.

[0012] When the pull rope is pulled outwards, the shifting block pushes the thimble back into the piston rod, the piston rod is unlocked and extended, pushing the backrest forward to achieve automatic backtracking; when the pull rope is pushed inwards, the shifting block rotates outwards and separates from the thimble, the thimble extends out of the piston rod, and the piston rod is locked in position and cannot be telescoped, thereby fixing the position of the backrest.

[0013] In the above-mentioned adaptive chair, a limiting structure is further provided on the seat cushion for limiting the pulling position of the pull rope. The limiting structure includes a mounting seat and a handle rotatably arranged on the mounting seat. The end of the pull rope is fixedly connected to the handle. Rotating the handle back and forth corresponds to pulling the pull rope inwards and outwards; a limiting arc groove is formed on the mounting seat, a limiting block is fixedly arranged on the handle, and the limiting block is inserted into the limiting arc groove. Rotating the handle corresponds to the limiting block moving back and forth along the limiting arc groove; two limiting concave holes are formed on the mounting seat, a spring pin is fixedly arranged on the handle, and when the limiting block rotates to both ends of the limiting arc groove respectively, the spring pin is inserted into the corresponding limiting concave holes respectively to lock the rotating position of the handle.

[0014] In the above-mentioned adaptive chair, the backrest includes a cross bar and two cushions fixedly arranged on the cross bar; two upper rotating shafts are fixedly arranged on the cross bar; two plug-in parts are arranged on the cross bar, and a plug block is fixedly arranged on the back of the cushion. The cushion is fixedly connected to the plug-in part through the plug block.

[0015] In the above-mentioned adaptive chair, a base is fixedly arranged on the back of the seat cushion, and two lower rotating shafts are fixedly arranged on the base.

[0016] In the above-mentioned adaptive chair, the mounting seat is fixedly arranged at the bottom of the seat cushion. A groove is formed at the bottom of the seat cushion. One end of the pull rope passes through the base and is embedded in the groove and fixedly connected to the handle at the bottom of the seat cushion.

[0017] In the above-mentioned adaptive chair, the rotating end A of the first connecting rod is coaxially arranged with the support on the piston rod of the gas spring, and the first connecting rod and the support are both rotatably arranged on the same lower rotating shaft.

[0018] In the above-mentioned adaptive chair, the three-link structure further includes an outer cover, and the outer cover covers the outer circumferences of the first connecting rod, the second connecting rod and the third connecting rod; several mounting angle pieces are fixedly arranged on the first connecting rod, and the outer cover is fixedly connected to each mounting angle piece.

[0019] In the above-mentioned adaptive chair, a long straight groove is provided on the connecting rod, and the central rotating shaft is movably arranged in the long straight groove and can translate up and down along the long straight groove.

[0020] Compared with the prior art, the utility model adopts the design of the three-link structure, which allows the backrest and the seat cushion to always maintain a nearly vertical state during the adjustment process. The overall forward and backward rotation of the three-link structure can achieve a nearly translational effect of the backrest relative to the seat cushion, and the structure is more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the chair of the utility model;

[0022] Figure 2 It is a schematic diagram of the backrest of the utility model after being adjusted forward;

[0023] Figure 3 It is a schematic diagram of the backrest of the utility model after being adjusted backwards;

[0024] Figure 4 It is an overall schematic diagram of the three-link structure of the utility model;

[0025] Figure 5 It is a cross-sectional view of the three-link structure of the utility model;

[0026] Figure 6 It is an exploded view of the three-link structure of the utility model;

[0027] Figure 7 It is a schematic diagram of the bottom structure of the seat cushion of the utility model;

[0028] Figure 8 It is a schematic diagram of the limiting structure of the utility model;

[0029] Fig. 9 It is a schematic diagram of the locking structure of the utility model.

[0030] In the figure, 1, bracket; 2, cushion; 3, backrest; 4, connecting rod 1; 5, connecting rod 2; 6, connecting rod 3; 7, rotating end A; 8, rotating end B; 9, rotating end C; 10, rotating end D; 11, upper rotating shaft; 12, middle rotating shaft; 13, lower rotating shaft; 14, gas spring; 15, piston rod; 16, pull rope; 17, shift block; 18, support; 19, pin shaft; 20, mounting seat; 21, handle; 22, limit arc groove; 23, limit block; 24, cross bar; 25, cushion; 26, base; 27, groove; 28, outer cover; 29, mounting angle piece; 30, plug block; 31, plug-in part; 32, long straight groove. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0032] like Figure 1 As shown, the adaptive chair described in the utility model comprises a support 1 and a seat cushion 2 and a backrest 3 arranged on the support 1, wherein the backrest 3 is movably arranged on the seat cushion 2 through a three-link structure. Figure 2 and Figure 3 As shown, during the adjustment of the backrest 3, the backrest 3 and the seat cushion 2 always maintain a nearly vertical state, and the backrest 3 is nearly translated relative to the seat cushion 2 by rotating the three-link structure as a whole forward and backward.

[0033] like Figures 4 to 6 As shown, the three-link structure includes a link 1 4, a link 2 5 and a link 3 6. The lower part of the link 1 4 is provided with a rotating end A7, and the upper part thereof is provided with a rotating end B8; the lower part of the link 2 5 is provided with a rotating end C9, and the upper part of the link 3 6 is provided with a rotating end D10; two lower rotating shafts 13 are fixedly provided on the seat cushion 2, and two upper rotating shafts 11 are fixedly provided on the backrest 3; the rotating end A7 and the rotating end C9 are rotatably set on the two lower rotating shafts 13, respectively, and the rotating end B8 and the rotating end D10 are rotatably set on the two upper rotating shafts 11, respectively, and the link 2 5 is rotatably connected with the link 3 6 through a central rotating shaft 12, and the central rotating shaft 12 is movably set in the middle part of the link 1 4 and can translate up and down relative to the link 1 4.

[0034] like Figure 5 As shown, a gas spring 14 is also provided between the seat cushion 2 and the backrest 3. The cylinder body of the gas spring 14 is rotatably set on the central rotating shaft 12, and the piston rod 15 of the gas spring 14 is rotatably set on the lower rotating shaft 13. A locking structure is also provided on the seat cushion 2 for locking or unlocking the position of the piston rod 15 of the gas spring 14.

[0035] like Fig. 9 As shown, the locking structure includes a pull rope 16, a shift block 17 and a support 18. The piston rod 15 of the gas spring 14 is fixedly connected to the support 18. The support 18 is rotatably set on the lower rotating shaft 13. The shift block 17 is rotatably set on the support 18 through a pin shaft 19. One end of the pull rope 16 is fixedly connected to the shift block 17. A push pin is set at the end of the piston rod 15 of the gas spring 14. The shift block 17 is pulled by the pull rope 16 to rotate around the pin shaft 19, so that the shift block 17 rotates until it abuts against the push pin and pushes the push pin to move.

[0036] When the pull cord 16 is pulled outward, the shift block 17 pushes the ejector pin back into the piston rod 15, and the piston rod 15 is unlocked and extended, pushing the backrest 3 forward to achieve automatic back-chasing; when the pull cord 16 is pushed inward, the shift block 17 rotates outward and separates from the ejector pin, and the ejector pin extends out of the piston rod 15, and the piston rod 15 is locked in position and cannot be extended or retracted, thereby fixing the position of the backrest 3.

[0037] like Figure 8 As shown, the seat cushion 2 is also provided with a limiting structure for limiting the pulling position of the pull rope 16, the limiting structure includes a mounting seat 20, a handle 21 rotatably arranged on the mounting seat 20, the end of the pull rope 16 is fixedly connected to the handle 21, and rotating the handle 21 forward and backward corresponds to pulling the pull rope 16 inward and outward; the mounting seat 20 is provided with a limiting arc groove 22, and the handle 21 is fixedly provided with a limiting block 23, the limiting block 23 is inserted into the limiting arc groove 22, and the handle 21 is rotated to correspond to the limiting block 23 moving back and forth along the limiting arc groove 22; the mounting seat 20 is provided with two limiting recessed holes, and the handle 21 is fixedly provided with a spring pin, and when the limiting blocks 23 are respectively rotated to the two ends of the limiting arc groove 22, the spring pins are respectively inserted into the corresponding limiting recessed holes for locking the rotation position of the handle 21.

[0038] like Figure 4 As shown, the backrest 3 includes a crossbar 24 and two cushions 25 fixed on the crossbar 24, and two upper shafts 11 are fixed on the crossbar 24; the crossbar 24 is provided with two plug-in parts 31, and a plug-in block 30 is fixed on the back of the cushion 25, and the cushion 25 is plugged and fixed on the plug-in part 31 through the plug-in block 30. A base 26 is fixed on the back of the seat cushion 2, and two lower shafts 13 are fixed on the base 26. Figure 7 As shown, the mounting seat 20 is fixedly mounted on the bottom of the cushion 2, and a groove 27 is provided at the bottom of the cushion 2. One end of the pull rope 16 passes through the base 26 and is inserted into the groove 27 and fixedly connected to the handle 21 at the bottom of the cushion 2. The rotating end A7 of the connecting rod 14 is coaxially arranged with the support 18 on the piston rod 15 of the gas spring 14, and the connecting rod 14 and the support 18 are both rotatably arranged on the same lower rotating shaft 13.

[0039] The three-link structure further includes an outer cover 28, which is disposed on the outer periphery of the connecting rod 1 4, the connecting rod 2 5 and the connecting rod 3 6; Figure 4 As shown, the connecting rod 1 4 is fixed with a plurality of mounting angle pieces 29, and the outer cover 28 is fixedly connected to each mounting angle piece 29. The connecting rod 1 4 is provided with a long straight groove 32, and the rotating shaft 12 is movably arranged in the long straight groove 32 and can be translated up and down along the long straight groove 32.

[0040] The outer cover 28 and the connecting rod 1 4, the connecting rod 2 5 and the connecting rod 3 6 as a whole can be regarded as a connecting arm structure connecting the backrest 3 and the seat cushion 2. During the adjustment process, the connecting arm as a whole rotates around its lower end, and the backrest 3 as a whole can synchronously rotate around the upper end of the connecting arm, so that the backrest 3 and the seat cushion 2 always maintain a nearly vertical state.

[0041] It should be understood that in the claims and description of the utility model, all "including..." should be understood as an open-ended meaning, that is, its meaning is equivalent to "at least contains...", and should not be understood as a closed meaning, that is, its meaning should not be understood as "only includes...".

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An adaptive chair, comprising a support (1) and a seat cushion (2) and a backrest (3) arranged on the support (1), wherein the backrest (3) is movably arranged on the seat cushion (2) via a three-link structure; The three-link structure comprises a link 1 (4), a link 2 (5) and a link 3 (6); the link 1 (4) is provided with a rotating end A (7) at its lower part and a rotating end B (8) at its upper part; the link 2 (5) is provided with a rotating end C (9) at its lower part and a rotating end D (10) at its upper part; the seat cushion (2) is fixedly provided with two lower rotating shafts (13), and the backrest (3) is fixedly provided with two upper rotating shafts (11); The rotating end A (7) and the rotating end C (9) are respectively rotatably arranged on two lower rotating shafts (13), and the rotating end B (8) and the rotating end D (10) are respectively rotatably arranged on two upper rotating shafts (11). The connecting rod 2 (5) is rotatably connected to the connecting rod 3 (6) via a central rotating shaft (12), and the central rotating shaft (12) is movably arranged in the middle of the connecting rod 1 (4) and can be translated up and down relative to the connecting rod 1 (4); A gas spring (14) is also provided between the seat cushion (2) and the backrest (3); the cylinder of the gas spring (14) is rotatably arranged on the middle rotating shaft (12); the piston rod (15) of the gas spring (14) is rotatably arranged on the lower rotating shaft (13); and a locking structure is also provided on the seat cushion (2) for locking or unlocking the position of the piston rod (15) of the gas spring (14).

2. The adaptive chair according to claim 1, characterized in that: The locking structure comprises a pull rope (16), a shift block (17) and a support (18); the piston rod (15) of the gas spring (14) is fixedly connected to the support (18); the support (18) is rotatably arranged on the lower rotating shaft (13); the shift block (17) is rotatably arranged on the support (18) via a pin shaft (19); one end of the pull rope (16) is fixedly connected to the shift block (17); a push pin is arranged at the end of the piston rod (15) of the gas spring (14); the shift block (17) is pulled by the pull rope (16) to rotate around the pin shaft (19) so that the shift block (17) rotates until it abuts against the push pin and pushes the push pin to move.

3. The adaptive chair according to claim 2, characterized in that: The seat cushion (2) is also provided with a limiting structure for limiting the pulling position of the pull rope (16), the limiting structure comprising a mounting seat (20), a handle (21) rotatably arranged on the mounting seat (20), the end of the pull rope (16) being fixedly connected to the handle (21), and the handle (21) being rotated forward and backward corresponds to pulling the pull rope (16) inward and outward; the mounting seat (20) is provided with a limiting arc groove (22), a limiting block (23) is fixedly arranged on the handle (21), the limiting block (23) is inserted into the limiting arc groove (22), and the handle (21) is rotated to move back and forth along the limiting arc groove (22) corresponding to the limiting block (23); the mounting seat (20) is provided with two limiting concave holes, a spring pin is fixedly arranged on the handle (21), and when the limiting block (23) is rotated to the two ends of the limiting arc groove (22), the spring pin is respectively inserted into the corresponding limiting concave holes for locking the rotation position of the handle (21).

4. The adaptive chair according to claim 1, characterized in that: The backrest (3) comprises a crossbar (24) and two cushions (25) fixed on the crossbar (24), and two upper rotating shafts (11) are fixed on the crossbar (24); two plug-in parts (31) are provided on the crossbar (24), and an insert block (30) is fixed on the back of the cushion (25), and the cushion (25) is fixed on the insert block (30) by plugging on the insert part (31).

5. The adaptive chair according to claim 1, characterized in that: A base (26) is fixedly arranged on the back of the seat cushion (2), and two lower rotating shafts (13) are fixedly arranged on the base (26).

6. The adaptive chair according to claim 3, characterized in that: The mounting seat (20) is fixedly mounted on the bottom of the seat cushion (2). A groove (27) is provided on the bottom of the seat cushion (2). One end of the pull rope (16) passes through the base (26) and is then embedded in the groove (27) and fixedly connected to the handle (21) at the bottom of the seat cushion (2).

7. The adaptive chair according to claim 1, characterized in that: The rotating end A (7) of the connecting rod 1 (4) is coaxially arranged with a support (18) on the piston rod (15) of the gas spring (14), and the connecting rod 1 (4) and the support (18) are both rotatably arranged on the same lower rotating shaft (13).

8. The adaptive chair according to claim 1, characterized in that: The three-link structure further comprises an outer cover (28), which is arranged on the outer periphery of the first link (4), the second link (5) and the third link (6); a plurality of mounting angle pieces (29) are fixedly arranged on the first link (4), and the outer cover (28) is fixedly connected to each mounting angle piece (29).

9. The adaptive chair according to claim 1, characterized in that: The connecting rod (4) is provided with a long straight groove (32), and the rotating shaft (12) is movably arranged in the long straight groove (32) and can move vertically along the long straight groove (32).

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