Backrest tilting elastic mechanism and chair

Abstract

The utility model relates to a backrest tipping elastic mechanism and a chair. The defects of unreasonable design and the like in the prior art are overcome. The backrest tilting elastic mechanism comprises a backrest hinged to a fixing part through a hinge set in the first direction, the backrest tilting elastic mechanism further comprises an elastic assembly, at least part of the elastic assembly abuts against the backrest, at least part of the remaining elastic assembly abuts against the fixing part, and the fixing part abuts against the backrest. The elastic assembly has linear elastic force located on the circumferential periphery of the hinge assembly. The backrest has the advantages that the linear elastic force provides linear compression force and linear resilience force during tipping cancelling, when the backrest is changed from a normal position to a tipping position, the elastic assembly is linearly compressed at the moment, and according to supporting stability analysis, the elastic force compression enables the tipping angle to be larger and more stable, and when tipping cancelling is conducted, the elastic assembly is not compressed. And the linear elastic force is linearly released by the compressed elastic force, so that the backrest can return more flexibly and quickly.

Description

Technical Field

[0001] The utility model belongs to the technical field of chairs, and in particular relates to a backrest tilting elastic mechanism and a chair. Background Art

[0002] Some chairs have a backrest that can be tilted. For example, CN201085301Y-A lifting and tilting adjustment device for an office chair; CN210540086U-A device for adjusting the tilt angle of a seat; CN211984654U-A tilting force adjustment device for an office chair; The above prior arts aim to solve the problem of how to adjust the tilt angle of the backrest, that is, the adjustment device locks the tilted backrest at the corresponding tilt angle.

[0003] Although the above schemes have the above advantages, the torsion spring or tension spring of the above technology requires auxiliary guidance to enable the backrest to tilt, and the auxiliary guidance will greatly increase the cost. The torsion spring needs to be sleeved on the rotating shaft, which is extremely inconvenient to disassemble and assemble, and the cost of the torsion spring is relatively high. In addition, the above two elastic methods need to further improve the rebound flexibility of the backrest and the support stability of the backrest. Utility Model Content

[0004] The purpose of the utility model is to provide a backrest reclining elastic mechanism and a chair that can solve the above technical problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The backrest tilt elastic mechanism includes a backrest hinged to a fixed part via two hinge groups in a first direction, and the backrest tilt elastic mechanism also includes an elastic component, at least a portion of the elastic component abuts against the backrest, and at least a portion of the remaining elastic component abuts against the fixed part, and the elastic component has a linear elastic force that is distributed perpendicularly to the first direction and is located at the circumferential periphery of the hinge group.

[0007] In the above-mentioned backrest tilting elastic mechanism, the elastic component has two linear elastic forces with opposite elastic directions.

[0008] In the above-mentioned backrest reclining elastic mechanism, there are two groups of elastic components distributed on the left and right sides of the backrest, and each group of elastic components has two linear elastic forces with opposite elastic directions.

[0009] In the above-mentioned backrest tilt elastic mechanism, the elastic component includes two springs parallel to each other and distributed on the circumferential periphery of the hinge group, one end of each spring abuts against the backrest, and the other end of each spring abuts against the fixing portion.

[0010] In the above-mentioned backrest tilt elastic mechanism, the fixed part is provided with a first fixed boss and a second fixed boss which extend along the first direction and are distributed in a circle, and the side of the backrest close to the fixed part is provided with a first limiting fan-shaped groove and a second limiting fan-shaped groove for limiting the rotation angle of the backrest around the hinge group, the first limiting fan-shaped groove is used to accommodate the first fixed boss and one of the springs, and the second limiting fan-shaped groove is used to accommodate the second fixed boss and the other spring.

[0011] In the above-mentioned backrest reclining elastic mechanism, the first fixed shoulder and the second fixed shoulder are staggered in vertical distribution;

[0012] The lower surface of the first fixed shoulder is a first positioning plane, the first limiting fan-shaped groove has a first plane groove wall which is parallel to the first positioning plane and located below the first positioning plane, the upper end of one of the springs abuts against the first positioning plane, and the lower end of the spring abuts against the first plane groove wall;

[0013] The upper surface of the second fixed boss is a second positioning plane, the second limiting fan-shaped groove has a second plane groove wall parallel to the second positioning plane and located above the second positioning plane, the upper end of the other spring abuts against the second plane groove wall, and the lower end of the spring abuts against the second positioning plane.

[0014] In the above-mentioned backrest tilt elastic mechanism, the outer peripheral surfaces of the first fixed shoulder and the second fixed shoulder are both arc-shaped convex surfaces, and the long arc-shaped groove wall of the first limiting fan-shaped groove and the long arc-shaped groove wall of the second limiting fan-shaped groove are respectively matched with the corresponding arc-shaped convex surfaces.

[0015] In the above-mentioned backrest tilt elastic mechanism, a positioning hole is provided on the inner side of the fixing portion, the first fixing boss and the second fixing boss are connected to the same side of the circular block, at least part of the circular block is installed in the positioning hole, and the fixing portion and the circular block are fixed together by a fastener along the first direction.

[0016] In the above-mentioned backrest reclining elastic mechanism, a circular space matching with the remaining part of the circular block is provided on the backrest, and the circular space is respectively connected with the first limiting fan-shaped groove and the second limiting fan-shaped groove.

[0017] The present application also provides a chair, which includes the backrest tilting elastic mechanism.

[0018] Compared with the existing technology, the advantages of this application are:

[0019] The elastic component has a linear elastic force which is distributed perpendicularly to the first direction and is located at the circumferential periphery of the hinge group 1. The linear elastic force provides a linear compression force and a linear rebound force when the reclining is cancelled. When the backrest changes from the normal position to the reclining position, the elastic component is linearly compressed at this time. From the perspective of support stability, the elastic force compression can make the reclining angle more stable. When the reclining is cancelled, the compressed linear elastic force is linearly released, making the return of the backrest more flexible and faster.

[0020] At least part of the elastic component abuts against the backrest, and at least part of the remaining elastic component abuts against the fixed portion. The backrest and the fixed portion are respectively contacted in an abutting manner. This structure is not only simple, but also easy to disassemble and assemble, which can greatly improve the production and assembly efficiency. Secondly, this structure can also greatly reduce the corresponding positioning features used to install and position the elastic component, so that the entire structure is more compact and the cost is lower.

[0021] The elastic components are arranged between the two sides of the backrest and the corresponding fixed parts. This structure can further improve the stability of the backrest because there are two hinge load-bearing points on both sides, which changes the unstable structure of the single hinge point on the lower side of the transmission backrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the backrest provided by the utility model.

[0023] Figure 2 It is a schematic diagram of a state in which the backrest provided by the utility model is restored to its proper position.

[0024] Figure 3 It is a schematic diagram of the state of the backrest provided by the utility model after being tilted back.

[0025] Figure 4 It is a schematic diagram of the backrest structure provided by the utility model.

[0026] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure along line AA.

[0027] Figure 6 yes Figure 4 Schematic diagram of the cross-section structure along line BB.

[0028] Figure 7 yes Figure 1 Schematic diagram of the three-dimensional structure without the fixing part.

[0029] Figure 8 It is a structural schematic diagram of a circular block provided by the utility model and provided with a first / second fixing boss.

[0030] Fig. 9 yes Figure 1Schematic diagram of the three-dimensional structure from another perspective without the fixing part.

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the fixing part provided by the utility model.

[0032] In the figure, the hinge group 1, the fixing part 2, the first fixing boss 20, the first positioning plane 200, the second fixing boss 21, the second positioning plane 210, the positioning hole 22, the circular block 23, the fastener 24, the backrest 3, the first limiting fan-shaped groove 30, the first plane groove wall 300, the first limiting groove wall 301, the second limiting fan-shaped groove 31, the second plane groove wall 310, the second limiting groove wall 311, the circular space 32, the elastic component 4, the spring 40, the lumbar support 5, the first direction X, the second direction Z, and the linear elastic force F1. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0034] Embodiment 1

[0035] like Figure 1 As shown, the backrest reclining elastic mechanism comprises two hinge groups 1, a fixing portion 2, a backrest 3 and an elastic component 4. The elastic component 4 is a spring component.

[0036] The fixed part 2 is, for example, a chair cushion body, and of course, can also be an armrest fixed to both sides of the cushion body. In this embodiment, the armrest is selected.

[0037] like Figure 1-Figure 4 As shown, the backrest 3 is hinged to the fixed part 2 through two hinge groups 1 in a first direction X. The hinge enables the backrest 3 to rotate around the hinge group 1 relative to the fixed part 2 to a certain angle, that is, to tilt.

[0038] There are two hinge groups 1, that is, the left and right sides of the backrest 3 are respectively hinged by the hinge groups 1 and the corresponding fixing parts 2. The hinges at two places make the reclining and canceling reclining movements of the backrest 3 smoother and more stable.

[0039] The hinge assembly 1 is, for example, a hinge pin or the like.

[0040] like Figure 1 , Figure 5 , Figure 7 and Figure 8As shown, the elastic component 4 has a linear elastic force F1 which is distributed perpendicularly to the first direction X and is located at the circumferential periphery of the hinge group 1. The linear elastic force F1 provides a linear compression force and a linear rebound force when the reclining is cancelled. When the backrest 3 changes from the normal position to the reclining position, the elastic component 4 is linearly compressed at this time. From the perspective of support stability, the elastic force compression can make the reclining angle more stable. When the reclining is cancelled, the compressed linear elastic force F1 is linearly released, making the return of the backrest 3 more flexible and faster.

[0041] At least part of the elastic component 4 abuts against the backrest 3, and at least part of the remaining elastic component 4 abuts against the fixing portion 2. The elastic component 4 contacts the backrest 3 and the fixing portion 2 respectively by abutting. This structure is not only simple, but also easy to disassemble and assemble, which can greatly improve the production and assembly efficiency. Secondly, this structure can also greatly reduce the corresponding positioning features used to install and position the elastic component 4, so that the entire structure is more compact and the cost is lower.

[0042] Secondly, the elastic component 4 of this embodiment is arranged between the two sides of the backrest 3 and the corresponding fixed part 2 (i.e., the armrest). This structure can further improve the stability of the backrest 3 because there are two hinge force receiving points on both sides, which changes the unstable structure of the single hinge point on the lower side of the transmission backrest.

[0043] Preferably, the elastic component 4 has two linear elastic forces F1 with opposite elastic force directions. Taking the drawings of this embodiment as an example, in the second direction Z, there is an upward linear elastic force F1 and a downward linear elastic force F1, that is, the two elastic forces are in opposite directions.

[0044] Of course, as some other embodiments, the distribution direction of the linear elastic force F1 can be in an inclined state with the second direction Z at an acute angle.

[0045] The two linear elastic forces F1 are compressed synchronously during reclining, which can ensure the stability of the support; when the reclining is cancelled, the two linear elastic forces F1 release the elastic forces in opposite directions to force the backrest 3 to rotate and reset relative to the hinge group 1, which can ensure the timeliness and flexibility of the reset of the backrest 3.

[0046] Furthermore, the two linear elastic forces F1 in opposite directions can restrain each other after the backrest 3 is reset to its original position after the tilt is canceled, so that the backrest 3 can prevent the backrest 3 from tilting slightly again due to inertia.

[0047] Preferably, there are two groups of elastic components 4 in this embodiment and they are distributed on the left and right sides of the backrest 3, and each group of elastic components 4 has two linear elastic forces F1 with opposite elastic force directions. The two groups of elastic components 4 are symmetrically distributed to ensure the symmetry and stability of the structure and force.

[0048] Secondly, the symmetrical setting can achieve compression consistency when tilting and eliminate the consistency of elastic force release when tilting.

[0049] Specifically, Figure 5 , Figure 7 and Figure 8 As shown, the elastic component 4 of this embodiment includes two springs 40 that are parallel to each other and distributed on the circumference of the hinge group 1, one end of each spring 40 abuts against the backrest 3, and the other end of each spring 40 abuts against the fixed portion 2. The tilting of the backrest 3 causes the spring 40 to be linearly compressed, and the spring 40 releases the linear elastic force F1 when the tilting is canceled, and it is always in linear elastic deformation, which can extend the service life of the spring. At the same time, this linear elastic deformation can make the elastic component 4 have stronger elastic support performance and stronger elastic resilience, so that the reset of the backrest 3 is more flexible and fast.

[0050] The axis of the spring 40 and the axis of the hinge assembly 1 are vertically distributed, which can also be understood as a "cross" distribution.

[0051] That is, no matter where the spring 40 is located on the periphery of the hinge assembly 1 , the axis of the spring 40 and the axis of the hinge assembly 1 are vertically distributed, but the spring 40 always has a linear elastic force F1 .

[0052] Specifically, the fixing portion 2 is provided with a first fixing boss 20 and a second fixing boss 21 extending along the first direction X and distributed circumferentially, and the first fixing boss 20 and the second fixing boss 21 can be understood as a cantilevered state, and the first fixing boss 20 and the second fixing boss 21 are in a fixed state. The backrest 3 moves relative to the first fixing boss 20 and the second fixing boss 21.

[0053] In order to make the tilt of the backrest 3 have an extreme position, a first limiting fan-shaped groove 30 and a second limiting fan-shaped groove 31 for limiting the rotation angle of the backrest 3 around the hinge group 1 are provided on the side of the backrest 3 close to the fixed part 2. The first limiting fan-shaped groove 30 is used to accommodate the first fixed boss 20 and one of the springs 40, and the second limiting fan-shaped groove 31 is used to accommodate the second fixed boss 21 and another spring 40.

[0054] like Figure 5 , Figure 7 and Figure 8 As shown, the following is one of the implementation methods:

[0055] The first fixed shoulder 20 and the second fixed shoulder 21 are staggered in the vertical direction;

[0056] The lower surface of the first fixed shoulder 20 is the first positioning plane 200, and the first limiting fan-shaped groove 30 has a first plane groove wall 300 parallel to the first positioning plane 200 and located below the first positioning plane 200, wherein the upper end of a spring 40 abuts against the first positioning plane 200, and the lower end of the spring 40 abuts against the first plane groove wall 300; at this time, the first limiting fan-shaped groove 30 and the first plane groove wall 300 are distributed at a first angle, and the first limiting groove wall 301 plays a limiting role in the extreme position. For example, when the first limiting groove wall 301 contacts the first fixed shoulder 20, the backrest 3 can no longer continue the reset movement after reclining.

[0057] Secondly, the upper surface of the second fixed boss 21 is the second positioning plane 210, the second limiting fan-shaped groove 31 has a second plane groove wall 310 parallel to the second positioning plane 210 and located above the second positioning plane 210, the upper end of another spring 40 abuts against the second plane groove wall 310, and the lower end of the spring 40 abuts against the second positioning plane 210. At this time, the second limiting fan-shaped groove 31 and the second plane groove wall 310 are distributed at a second angle, and the second limiting groove wall 311 plays a limiting role in the extreme position. For example, when the second limiting groove wall 311 contacts the second fixed boss 21, the backrest 3 can no longer continue the reset movement after reclining.

[0058] The above plane contacts the spring 40, so that the spring 40 has a linear elastic force F1. At the same time, the designed first limit groove wall 301 and the second limit groove wall 311 can restrict the tilting limit position to ensure the safety of use.

[0059] In addition, the outer peripheral surfaces of the first fixed shoulder 20 and the second fixed shoulder 21 are both arcuate convex surfaces, and the long arcuate groove wall of the first limiting sector groove 30 and the long arcuate groove wall of the second limiting sector groove 31 are matched with the corresponding arcuate convex surfaces. This matching can make the reclining and canceling reclining motion of the backrest 3 guided, making the reclining motion of the backrest 3 more stable and reliable.

[0060] In this embodiment, the backrest 3 has the following postures:

[0061] The first is a normal state when there is no user leaning on the seat. At this time, the spring 40 is in a normal state, for example, it is compressed due to the force of tilting back.

[0062] The second is the tilted state, in which the spring 40 is linearly compressed. During compression, taking the two springs 40 of the single-sided elastic component 4 as an example, one spring 40 is linearly compressed downward, and the other spring 40 is linearly compressed upward. The linear compression directions are different because the first fixed boss 20 and the second fixed boss 21 are staggered up and down and are in a fixed state.

[0063] The third is to cancel the reclining state, at which time the linear compression force of the spring 40 is released, and the released linear force F1 is opposite to the compression direction of the spring 40 in the reclining state. The linear forces F1 generated by the two released forces are parallel to each other and force the backrest 3 to reset.

[0064] Embodiment 2

[0065] The structure and working principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 6 and Figure 8-Figure 10 As shown, a positioning hole 22 is provided on the inner side of the fixing portion 2, the first fixing boss 20 and the second fixing boss 21 are connected to the same side of the circular block 23, at least part of the circular block 23 is installed in the positioning hole 22, and the fixing portion 2 and the circular block 23 are fixed together by fasteners 24 along the first direction X, such as bolts, etc., and there are at least two fasteners 24. A circular space 32 is provided on the backrest 3 to match the remaining part of the circular block 23, and the circular space 32 is respectively connected to the first limiting fan-shaped groove 30 and the second limiting fan-shaped groove 31.

[0066] Secondly, the positioning hole 22 is a blind hole, and the bottom of the positioning hole 22 and the circular block 23 are connected by a concave-convex structure to achieve circumferential locking of the circular block 23 and the positioning hole 22. Specifically, the concave-convex structure includes a strip protrusion 25 and a strip groove 26 that cooperate with each other, and any one of the strip protrusion 25 and the strip groove 26 is provided on the circular block 23, and the other is provided on the bottom of the positioning hole 22.

[0067] The circular space 32 matches the circular block 23 and can play a circumferential guiding role when the backrest 3 is tilted and rotated, so as to make the tilting movement more stable.

[0068] Secondly, the design of the circular block 23 allows the first fixed boss 20 and the second fixed boss 21 that are worn or need to be replaced to form a single component, that is, only the circular block 23 with the first fixed boss 20 and the second fixed boss 21 needs to be replaced, which can greatly reduce maintenance costs.

[0069] In addition, the design of the circular block 23 combined with the circular space 32 allows the elastic component 4 to be built-in and hidden, which not only improves the aesthetics of the overall structure, but also prolongs the service life of each built-in component (such as the spring 40).

[0070] Embodiment 3

[0071] The tilting elastic mechanism of this embodiment can also be applied to headrests, waist support 5 and other components. Figure 1 As shown, and as another embodiment, the lumbar support 5 and the backrest 3 are directly injection molded into an integral structure.

[0072] Embodiment 4

[0073] This embodiment provides a chair, which includes the backrest tilting elastic mechanism of the first embodiment or the second embodiment, and the chair is a swivel chair or a non-rotatable chair.

[0074] Secondly, the chair also includes chair legs and a cushion body connected to the top of the chair legs.

[0075] 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. A backrest reclining elastic mechanism, comprising a backrest (3), characterized in that: The backrest tilt elastic mechanism also includes the backrest (3) hinged to the fixed part (2) in a first direction (X) through two hinge groups (1), and the backrest tilt elastic mechanism also includes an elastic component (4), the elastic component (4) has a linear elastic force (F1) located at the circumferential periphery of the hinge group (1), at least part of the elastic component (4) abuts against the backrest (3), and at least part of the remaining elastic component (4) abuts against the fixed part (2).

2. The backrest reclining elastic mechanism according to claim 1, characterized in that: The elastic component (4) has two linear elastic forces (F1) with opposite elastic directions.

3. The backrest reclining elastic mechanism according to claim 2, characterized in that: There are two groups of elastic components (4) distributed on the left and right sides of the backrest (3), and each group of elastic components (4) has two linear elastic forces (F1) with opposite elastic force directions.

4. The backrest reclining elastic mechanism according to claim 1, 2 or 3, characterized in that: The elastic component (4) comprises two springs (40) which are parallel to each other and distributed on the circumferential periphery of the hinge group (1), one end of each of the springs (40) abuts against the backrest (3), and the other end of each of the springs (40) abuts against the fixed portion (2).

5. The backrest reclining elastic mechanism according to claim 4, characterized in that: The fixing portion (2) is provided with a first fixing boss (20) and a second fixing boss (21) which are extended along the first direction (X) and are distributed in a circumferential manner; the backrest (3) is provided with a first limiting fan-shaped groove (30) and a second limiting fan-shaped groove (31) on one side of the backrest (3) close to the fixing portion (2) for limiting the rotation angle of the backrest (3) around the hinge group (1); the first limiting fan-shaped groove (30) is used to accommodate the first fixing boss (20) and one of the springs (40); and the second limiting fan-shaped groove (31) is used to accommodate the second fixing boss (21) and the other spring (40).

6. The backrest reclining elastic mechanism according to claim 5, characterized in that: The first fixing boss (20) and the second fixing boss (21) are staggered in an up-and-down manner; The lower surface of the first fixing boss (20) is a first positioning plane (200), the first limiting fan-shaped groove (30) has a first plane groove wall (300) parallel to the first positioning plane (200) and located below the first positioning plane (200), the upper end of one of the springs (40) abuts against the first positioning plane (200), and the lower end of the spring (40) abuts against the first plane groove wall (300); The upper surface of the second fixed boss (21) is a second positioning plane (210), the second limiting fan-shaped groove (31) has a second plane groove wall (310) parallel to the second positioning plane (210) and located above the second positioning plane (210), the upper end of another spring (40) abuts against the second plane groove wall (310), and the lower end of the spring (40) abuts against the second positioning plane (210).

7. The backrest reclining elastic mechanism according to claim 6, characterized in that: The outer peripheral surfaces of the first fixed shoulder (20) and the second fixed shoulder (21) are both arc-shaped convex surfaces, and the long arc-shaped groove wall of the first limiting fan-shaped groove (30) and the long arc-shaped groove wall of the second limiting fan-shaped groove (31) respectively match the corresponding arc-shaped convex surfaces.

8. The backrest reclining elastic mechanism according to claim 5, characterized in that: A positioning hole (22) is provided on the inner side of the fixing portion (2); the first fixing boss (20) and the second fixing boss (21) are connected to the same side of the circular block (23); at least a portion of the circular block (23) is mounted on the positioning hole (22); and the fixing portion (2) and the circular block (23) are fixed together by a fastener (24) along the first direction (X).

9. The backrest reclining elastic mechanism according to claim 8, characterized in that: The backrest (3) is provided with a circular space (32) that matches the remaining part of the circular block (23), and the circular space (32) is respectively connected to the first limiting sector groove (30) and the second limiting sector groove (31).

10. A chair, characterized in that The chair comprises the backrest tilting elastic mechanism according to any one of claims 1-9.

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