An adaptive chair back structure

Abstract

An adaptive chair back structure comprises a support and a back frame, the upper part of the back frame is connected with the support, the lower part of the back frame is connected with the support through an elastic connecting piece which is used to produce deformation buffer when the back frame is forced and drive the back frame to rebound when the back frame is not forced, and at least one rotating connecting piece is connected between the back frame and the support to limit the rotation when the back frame rotates to the preset maximum angle. In use, the deformation and recovery of the elastic connecting piece automatically realize the buffer swing when the back frame is forced and the smooth rebound when the back frame is not forced, and the use comfort is improved. When the elastic connecting piece deforms to the limit position, the rotating connecting piece forms reliable mechanical limiting, effectively prevents the elastic connecting piece from plastic deformation or fracture due to excessive deformation, prolongs the service life of the elastic connecting piece, and improves the reliability and safety of the product.

Description

Technical Field

[0001] This utility model relates to the field of chair technology, specifically to an adaptive chair back structure. Background Technology

[0002] Many existing office chairs and lounge chairs feature adjustable backrests or reclining functions to improve comfort. Common reclining mechanisms typically rely on complex spring, gas spring, or gear structures, resulting in higher costs and structural complexity. Designs using simple elastic elements often lack effective limit protection, making the elastic elements prone to fatigue damage due to excessive deformation, affecting lifespan and functional stability. Therefore, a simple, reliable, low-cost, self-adaptive backrest structure with automatic rebound and protective functions is needed. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides an adaptive chair back structure.

[0004] The technical solution adopted by this utility model to solve its technical problem is: An adaptive chair back structure includes a support frame and a back frame. The upper part of the back frame is connected to the support frame, and the lower part of the back frame is connected to the support frame via an elastic connector for using its own material elasticity to generate deformation buffer when the back frame is under force and to drive the back frame to rebound when it is not under force. The back frame and the support frame are connected via at least one rotating connector for limiting the rotation when the back frame rotates relative to the support frame to a preset maximum angle. The two ends of the rotating connector are respectively rotatably connected to the back frame and the support frame.

[0005] In this invention, the ends of the rotating connector and the elastic connector used to connect to the back frame are both lower than the ends of the rotating connector and the elastic connector used to connect to the bracket.

[0006] In this utility model, the back frame is provided with a lower back frame connecting part, and one end of the elastic connector is provided with a first connecting part that is adapted to and connected to the lower back frame connecting part. The first connecting part and the lower back frame connecting part are fixedly connected by a first lower fastener.

[0007] In this utility model, the first connecting part is provided with a first lower connecting groove, and the lower connecting part of the back frame is embedded in the first lower connecting groove.

[0008] In this utility model, the bracket is provided with a lower bracket connecting part, and the other end of the elastic connector is provided with a second connecting part adapted to and connected to the lower bracket connecting part. The second connecting part and the lower bracket connecting part are fixedly connected by a second lower fastener.

[0009] In this utility model, the lower connecting part of the bracket is a bracket positioning groove provided on the bracket, and the second connecting part is at least partially positioned and embedded in the bracket positioning groove.

[0010] In this invention, the rotating connector is located above the elastic connector, and there are multiple rotating connectors arranged at intervals from top to bottom.

[0011] In this utility model, the rotating connector includes a rotating body, a first shaft portion disposed at one end of the rotating body, and a second shaft portion disposed at the other end of the rotating body. The bracket is provided with a first shaft seat, and the first shaft portion is rotatably connected to the first shaft seat. The back frame is provided with a second shaft seat, and the second shaft portion is rotatably connected to the second shaft seat.

[0012] In this utility model, the first bearing seat is provided with a first bearing hole, the first shaft part passes through the first bearing hole, and the first bearing seat is provided with a first opening groove for the first shaft part to be engaged in the first bearing hole. The minimum width of the first opening groove is smaller than the diameter of the first shaft part.

[0013] In this utility model, the second shaft seat is provided with a second shaft hole, the second shaft part passes through the second shaft hole, and the second shaft seat is provided with a second opening groove for the second shaft part to be engaged in the second shaft hole. The minimum width of the second opening groove is smaller than the diameter of the second shaft part.

[0014] The beneficial effects of this utility model are as follows: This utility model achieves the swing function of the back frame through the cooperation between the elastic connector and the rotating connector, effectively reducing manufacturing costs and assembly difficulty. During use, the deformation and recovery of the elastic connector automatically achieves buffered swinging under force and smooth rebound when force is released, improving user comfort. When the elastic connector deforms to its limit position, the rotating connector forms a reliable mechanical limit, effectively preventing the elastic connector from undergoing plastic deformation or breakage due to excessive deformation, extending the service life of the elastic connector, and improving the reliability and safety of the product. Furthermore, the multiple rotating connectors not only provide rotational fulcrums but also play a good guiding role in the swing trajectory of the back frame, making the swinging process more stable and smooth. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 A three-dimensional diagram of the combined support frame and back frame; Figure 2 This is a schematic diagram showing the connection between the support frame and the back frame; Figure 3 for Figure 2 Enlarged view of section A; Figure 4This is a schematic diagram showing the connection between the back frame and the elastic connector; Figure 5 This is a schematic diagram showing the connection between the bracket and the elastic connector; Figure 6 This is a schematic diagram of the installation of the second bearing seat; Figure 7 This is a schematic diagram showing the connection between the support frame and the upper part of the back frame; Figure 8 The explosion of some parts in this embodiment Figure 1 ; Figure 9 The explosion of some parts in this embodiment Figure 2 ; Figure 10 This is a schematic diagram of the structure of this embodiment. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0017] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0018] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0020] Reference Figure 1-10 An adaptive chair back structure includes a support frame 1 and a backrest 2. The lower part of the backrest 2 protrudes forward to form a lumbar support, which is integrally formed with the backrest 2 to conform to the user's waist and improve support comfort. The upper part of the backrest 2 is connected to the support frame 1, and the lower part of the backrest 2 is connected to the support frame 1 via an elastic connector 3. This connector utilizes the elasticity of its material to buffer deformation when the backrest 2 is under stress and to drive the backrest 2 to rebound when no stress is applied. At least one rotating connector 4 is connected between the backrest 2 and the support frame 1 to limit the rotation of the backrest 2 relative to the support frame 1 when it rotates to a preset maximum angle. Both ends of the rotating connector 4 are rotatably connected to the backrest 2 and the support frame 1, respectively. The ends of the rotating connector 4 and the elastic connector 3 that connect to the backrest 2 are both lower than the ends of the rotating connector 4 and the elastic connector 3 that connect to the support frame 1, allowing the backrest 2 to smoothly drive the rotating connector 4 to rotate and the elastic connector 3 to deform when under stress.

[0021] In this embodiment, the elastic connector 3, the bracket 1, and the back frame 2 are all integrally made of plastic through injection molding. The bracket 1 and the back frame 2 are limited by their own structural shape and can only produce limited elastic deformation. The elastic connector 3 has a strip-shaped structure, which has good elastic deformation capability and fatigue resistance, and can maintain stable performance in multiple stress and rebound cycles.

[0022] In this embodiment, the back frame 2 is provided with a lower back frame connecting part 21, and one end of the elastic connector 3 is provided with a first connecting part 31 that is adapted to and connected to the lower back frame connecting part 21. The first connecting part 31 and the lower back frame connecting part 21 are fixedly connected by a first lower fastener.

[0023] Furthermore, the first connecting part 31 is provided with a first lower connecting hole 310, and the lower connecting part 21 of the back frame is provided with a first lower mating hole 211 aligned with the first lower connecting hole 310. The first lower fastener is a first lower connecting bolt that passes through the first lower connecting hole 310 and is threaded into the first lower mating hole 211.

[0024] Furthermore, in order to improve stability, the first connecting part 31 is provided with a first lower connecting groove 311, and the lower connecting part 21 of the back frame is embedded in the first lower connecting groove 311 to increase the contact area and improve the connection strength and anti-torsion performance.

[0025] Furthermore, the first connecting portion 31 is also provided with a first lower recess 312. The two ends of the first lower connecting hole 310 are respectively connected to the first lower connecting groove 311 and the first lower recess 312, so that the head of the first lower connecting bolt is hidden in the first lower recess 312, which improves the aesthetics and reduces the probability of the head of the first lower connecting bolt being damaged by external factors. In addition, a first lower decorative cover 5 is provided at the opening of the first lower recess 312, and the first lower decorative cover 5 is fixed to the first lower recess 312 by an interference fit.

[0026] In this embodiment, the bracket 1 is provided with a lower bracket connecting part 11, and the other end of the elastic connector 3 is provided with a second connecting part 32 that is adapted to and connected to the lower bracket connecting part 11. The second connecting part 32 and the lower bracket connecting part 11 are fixedly connected by a second lower fastener.

[0027] Furthermore, the second connecting part 32 is provided with a second lower connecting hole 321, and the lower connecting part 11 of the bracket is provided with a second lower mating hole 111 aligned with the second lower connecting hole 321. The second lower fastener is a second lower connecting bolt that passes through the second lower connecting hole 321 and is threaded into the second lower mating hole 111.

[0028] Furthermore, to improve stability, the lower connecting part 11 of the bracket is a bracket positioning groove provided on the bracket 1, and the second connecting part 32 is at least partially positioned and embedded in the bracket positioning groove, thereby improving the connection stability between the elastic connector 3 and the bracket 1.

[0029] In this embodiment, the rotating connector 4 is located above the elastic connector 3. There are multiple rotating connectors 4 arranged at intervals from top to bottom, preferably five. Multiple rotating connectors 4 help to ensure that the back frame 2 is subjected to uniform force during rotation, thereby improving the stability and service life of the overall structure.

[0030] In this embodiment, the rotating connector 4 includes a rotating body 41, a first shaft portion 42 disposed at one end of the rotating body 41, and a second shaft portion 43 disposed at the other end of the rotating body 41. The bracket 1 is provided with a first bearing seat 100, and the first shaft portion 42 is rotatably connected to the first bearing seat 100. The back frame 2 is provided with a second bearing seat 200, and the second shaft portion 43 is rotatably connected to the second bearing seat 200. Each rotating connector 4 corresponds to one first bearing seat 100 and one second bearing seat 200.

[0031] Furthermore, the two ends of the rotating body 41 are respectively provided with a first groove and a second groove. The first shaft portion 42 is located in the first groove, and the second shaft portion 43 is located in the second groove. The first shaft portion 42, the second shaft portion 43, and the rotating body 41 are integrally formed to improve structural stability. When the back frame 2 tilts to its maximum angle, at least a portion of the rotating body 41 of the rotating connector 4 abuts against the first axle seat 100 and / or the second axle seat 200, and / or a portion of the rotating connector 4 abuts against each other, thereby forming a mechanical limit on the further tilting of the back frame 2, limiting the maximum tilting angle of the back frame 2, and locking the maximum deformation of the elastic connector 3.

[0032] In this embodiment, the first bearing seat 100 is located on the side of the bracket 1 facing the back frame 2. The first bearing seat 100 is integrally formed with the bracket 1 to enhance structural stability and reduce assembly steps. The first bearing seat 100 is provided with a first shaft hole 101, and the first shaft portion 42 passes through the first shaft hole 101 to achieve a rotatable connection. Furthermore, the first bearing seat 100 is provided with a first opening groove 102 for the first shaft portion 42 to engage with the first shaft hole 101. The minimum width of the first opening groove 102 is smaller than the diameter of the first shaft portion 42, which facilitates the insertion of the first shaft portion 42 into the first shaft hole 101 during assembly. After assembly, the engagement and positioning are achieved through elastic recovery.

[0033] In this embodiment, the second bearing seat 200 is located on the side of the back frame 2 facing the support 1. The second bearing seat 200 is provided with a second shaft hole 201, and the second shaft portion 43 passes through the second shaft hole 201 to achieve a rotatable connection. Furthermore, the second bearing seat 200 is provided with a second opening groove 202 for the second shaft portion 43 to be engaged with the second shaft hole 201. The minimum width of the second opening groove 202 is smaller than the diameter of the second shaft portion 43, which facilitates the second shaft portion 43 to be inserted into the second shaft hole 201 during assembly. After assembly, the engagement and positioning are achieved through elastic recovery.

[0034] In this embodiment, the second bearing seat 200 is mounted on the back frame 2 using bearing seat bolts. The shank of the bearing seat bolt passes through the bearing seat connecting through hole 22 on the back frame 2 and is then threaded into the bearing seat screw hole 203 of the second bearing seat 200, thereby achieving a stable connection between the second bearing seat 200 and the back frame 2, and facilitating disassembly and maintenance. Furthermore, the back frame 2 is provided with a bearing seat positioning groove 23 corresponding to the second bearing seat 200. One end of the second bearing seat 200 is fitted into the bearing seat positioning groove 23, thereby improving the installation quality of the second bearing seat 200.

[0035] In this embodiment, the back side of the upper part of the back frame 2 is provided with a back frame upper connecting part 24, and the bracket 1 is provided with a bracket upper connecting part 12 that is adapted to the back frame upper connecting part 24. The back frame upper connecting part 24 and the bracket upper connecting part 12 are connected by upper fasteners.

[0036] Furthermore, the upper connecting part 24 of the back frame is provided with an upper connecting hole 241, and the upper connecting part 12 of the bracket is provided with an upper mating hole 121 aligned with the upper connecting hole 241. The upper fastener is an upper connecting bolt that passes through the upper mating hole 121 and is threaded into the upper connecting hole 241, thereby realizing the upper fixed connection between the back frame 2 and the bracket 1.

[0037] Furthermore, the upper connecting part 12 of the bracket is provided with an upper mounting groove 122, and the upper connecting part 24 of the back frame is adapted to the upper mounting groove 122, thereby improving the fit quality at the connection between the bracket 1 and the back frame 2 and enhancing the structural stability.

[0038] Furthermore, the bracket 1 has a hidden groove 13 on the side facing away from the mounting groove 122. The two ends of the upper mating hole 121 are respectively connected to the mounting groove 122 and the hidden groove 13, so that the head of the upper connecting bolt is recessed into the hidden groove 13, preventing the bolt head from being exposed, improving the overall appearance and reducing the risk of external impact. An upper decorative cover 6 is provided at the opening of the hidden groove 13, and the upper decorative cover 6 is detachably connected to the opening of the hidden groove 13 by an interference fit.

[0039] In this embodiment, as Figure 10 As shown, a cushion module 7 is fitted onto the backrest frame 2. The cushion module 7 covers the front and back edges of the backrest frame 2, thereby increasing the comfort and aesthetics of the chair back. The cushion module 7 can consist of a protective cover and filling material between the protective cover and the backrest frame 2. The protective cover is made of wear-resistant fabric or artificial leather, effectively improving the feel and durability. The filling material is high-resilience sponge or memory foam, providing high comfort.

[0040] When the user leans back against the chair back, the lumbar support presses against the user's lower back. The lower part of the backrest 2 is initially subjected to backward pressure, causing the elastic connector 3 at the bottom to undergo elastic deformation. The deformation of the elastic connector 3 buffers the pressure, preventing the user from feeling a hard impact. At the same time, during this process, the rotating connector 4 rotates around the two pivot points at its two ends, providing stable support and guidance, preventing the backrest 2 from shifting left or right or getting stuck during rotation. When the lower part of the backrest 2 swings backward to its maximum angle, the rotating connector 4 also rotates to its maximum rotation angle. At this point, the joint of the rotating connector 4... The structure restricts its continued rotation, thereby limiting the back frame 2 from continuing to rotate backward and swing. At the same time, it limits the maximum deformation of the elastic connector 3, preventing permanent damage to the elastic connector 3 due to excessive deformation and effectively extending the service life of the elastic connector 3. When the user releases the pressure on the back frame 2, the elastic connector 3 rebounds due to its own elastic restoring force, driving the back frame 2 to reset. At the same time, it drives the rotating connector 4 to rotate in the opposite direction to the initial position, completing one swinging action cycle. Repeating the above force-rebound action, the back frame 2 has a continuous swinging function.

[0041] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. An adaptive chair back structure, comprising a support (1) and a back frame (2), wherein the upper part of the back frame (2) is connected to the support (1), and the lower part of the back frame (2) is connected to the support (1) by an elastic connector (3) for utilizing its own material elasticity to generate deformation buffer when the back frame (2) is subjected to force and to drive the back frame (2) to rebound when it is not subjected to force, characterized in that: At least one rotating connector (4) is connected between the back frame (2) and the support (1) to limit the rotation when the back frame (2) rotates relative to the support (1) to a preset maximum angle. The two ends of the rotating connector (4) are rotatably connected to the back frame (2) and the support (1) respectively.

2. The adaptive chair back structure according to claim 1, characterized in that: The ends of the rotating connector (4) and the elastic connector (3) used to connect to the back frame (2) are both lower than the ends of the rotating connector (4) and the elastic connector (3) used to connect to the bracket (1).

3. The adaptive chair back structure according to claim 1, characterized in that: The back frame (2) is provided with a lower back frame connecting part (21), and one end of the elastic connector (3) is provided with a first connecting part (31) that is adapted to connect with the lower back frame connecting part (21). The first connecting part (31) and the lower back frame connecting part (21) are fixedly connected by a first lower fastener.

4. The adaptive chair back structure according to claim 3, characterized in that: The first connecting part (31) is provided with a first lower connecting groove (311), and the lower connecting part (21) of the back frame is embedded in the first lower connecting groove (311).

5. The adaptive chair back structure according to claim 3, characterized in that: The bracket (1) is provided with a lower bracket connecting part (11), and the other end of the elastic connector (3) is provided with a second connecting part (32) that is adapted to connect with the lower bracket connecting part (11). The second connecting part (32) and the lower bracket connecting part (11) are fixedly connected by a second lower fastener.

6. The adaptive chair back structure according to claim 5, characterized in that: The lower connecting part (11) of the bracket is a bracket positioning groove provided on the bracket (1), and the second connecting part (32) is at least partially positioned and embedded in the bracket positioning groove.

7. An adaptive chair back structure according to any one of claims 1-6, characterized in that: The rotating connector (4) is located above the elastic connector (3), and there are multiple rotating connectors (4) arranged at intervals from top to bottom.

8. An adaptive chair back structure according to any one of claims 1-6, characterized in that: The rotating connector (4) includes a rotating body (41), a first shaft portion (42) located at one end of the rotating body (41), and a second shaft portion (43) located at the other end of the rotating body (41). The bracket (1) is provided with a first shaft seat (100), and the first shaft portion (42) is rotatably connected to the first shaft seat (100). The back frame (2) is provided with a second shaft seat (200), and the second shaft portion (43) is rotatably connected to the second shaft seat (200).

9. The adaptive chair back structure according to claim 8, characterized in that: The first bearing seat (100) is provided with a first shaft hole (101), and the first shaft part (42) passes through the first shaft hole (101). The first bearing seat (100) is provided with a first opening groove (102) for the first shaft part (42) to be engaged in the first shaft hole (101). The minimum width of the first opening groove (102) is smaller than the diameter of the first shaft part (42).

10. An adaptive chair back structure according to claim 8, characterized in that: The second shaft seat (200) is provided with a second shaft hole (201), and the second shaft part (43) passes through the second shaft hole (201). The second shaft seat (200) is provided with a second opening groove (202) for the second shaft part (43) to be engaged in the second shaft hole (201). The minimum width of the second opening groove (202) is smaller than the diameter of the second shaft part (43).

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