Chair back structure with self-adaptive adjusting function

Abstract

The utility model discloses a chair back structure with a self-adaptive adjusting function, belongs to the technical field of chairs, and aims to solve the problems that an existing adjustable chair back needs to be manually operated, the supporting adaptability is poor, and the structural stability is insufficient. The chair comprises a chair back, a seat frame, a torsion spring assembly and an aluminum alloy connecting piece, the torsion spring assembly is connected with the chair back and the seat frame through an aluminum alloy connecting piece to form a linkage mechanism, the angle is automatically adjusted when the chair back is stressed through elastic deformation of a spring, automatic reset is achieved after stress is relieved, and manual operation is not needed. The chair back is provided with a back rotating shaft and back limiting teeth, accurate adjustment is guaranteed, the angle is stable when the chair back is not stressed, and meanwhile the lower half portion of the chair back can actively push the waist to strengthen supporting when the chair back is stressed; the aluminum alloy connecting piece is matched with the bolt and the gasket to guarantee stable connection, the decorative cover improves appearance safety, and the seat frame is matched with various foot stands through the screw rod. The structure improves use convenience and comfort, adapts to multiple scenes and is high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of seat, concretely relates to a chair back structure with self -adaptation adjusting function. BACKGROUND

[0002] In the office, household, industrial and other scenes, as the high-frequency use furniture, the support and the adjustment convenience of the chair back directly influence the use experience and the health of the user. With the improvement of the comfortable demand of the sedentary population, the chair back structure gradually develops from the early fixed angle design to the adjustable design, and the mainstream adjustable chair back on the market is realized by the manual knob, the pull rod or the air pressure rod to adjust the angle, aims at adapting to the sitting habits of different users, relieves the waist and the back fatigue brought by the long sitting, and is widely applied to various seat products such as office chair, leisure chair, dining chair and the like.

[0003] However, the existing manual adjustment type chair back has obvious convenience defects. The structure needs the user to manually operate the adjusting part (such as rotating the knob to loosen the spring, pulling the pull rod to unlock the angle) to change the position of the chair back, and the adjustment process needs to interrupt the current sitting posture, especially in the office, game and other focused scenes, frequent manual adjustment will interrupt the attention of the user; at the same time, for the old, children or the disabled population, the force requirement of manual operation also increases the use threshold, and it is difficult to realize the demand of instant adaptation.

[0004] In addition, the support adaptability and stability of the existing adjustable chair back are insufficient. On the one hand, most of the manual adjustment chair back can only be fixed at the preset 3-5 angle gears, cannot be continuously fine-tuned according to the real-time sitting force of the user, is easy to appear the problems of too straight or too inclined, is difficult to fit the back curve under different weights and different sitting postures, and leads to the waist suspension or the back compression; on the other hand, part of the low-price products adopt single bolt fixation or simple spring structure, and are easy to appear adjustment jamming, angle deviation after long-term use, and even cause safety hazards due to insufficient support structure strength, and cannot meet the long-term high-frequency use demand. SUMMARY

[0005] The utility model solves the technical problems that the adjustable chair back in the prior art needs manual operation adjustment, the support adaptability is poor and is difficult to fit the human body curve, and the structural stability and the scene adaptability are insufficient.

[0006] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A chair back structure with self-adaptive adjusting function, comprising a chair back, a seat frame and a torsion spring assembly.

[0008] The torsion spring assembly is connected with the chair back and the seat frame through aluminum alloy connectors to form a linkage mechanism that can self-adaptively adjust the angle of the chair back, so that the chair back can automatically adjust to the optimal supporting position when being stressed; during the self-adaptive adjustment, the torsion spring assembly stores and releases energy through elastic deformation to realize the automatic reset and continuous adjustment of the position of the chair back.

[0009] Preferably, the torsion spring assembly comprises left and right torsion springs, the legs of which are respectively fixed in the positioning slots A on the left and right sides of the chair back, and the other ends of which are respectively fixed in the positioning slots B on the left and right aluminum alloy connectors, and form an angle difference of 45 degrees.

[0010] Preferably, the aluminum alloy connectors comprise left and right aluminum alloy connectors, which are respectively locked with the chair back through left and right torsion shaft bolts, and are provided with decorative covers A and B for appearance protection.

[0011] The left and right torsion shaft bolts are respectively arranged through the left and right aluminum alloy connectors, and a gasket B is arranged between the left torsion shaft bolt and the left aluminum alloy connector, and a gasket A is arranged between the right torsion shaft bolt and the right aluminum alloy connector.

[0012] Preferably, the decorative covers A and B are respectively provided with buckles, and the left and right aluminum alloy connectors are respectively provided with clamping positions corresponding to the buckles, so that the assembly of the decorative cover A and the left aluminum alloy connector and the assembly of the decorative cover B and the right aluminum alloy connector are realized through the buckling of the buckles and the clamping positions.

[0013] Preferably, after the left and right aluminum alloy connectors are respectively positioned and inserted on the left and right sides of the seat frame, the chair back and the seat frame are stably connected through seat back connecting bolts A, B, C and D.

[0014] Preferably, the chair back is respectively provided with back rotating shafts connected with the right and left torsion shaft bolts, and back limiting teeth inserted and limited in the insertion slots on the left and right aluminum alloy connectors.

[0015] When the chair back is not stressed, the torsion spring assembly pushes the chair back forward, the front end of the back limiting teeth is in contact with the aluminum alloy connector, the angle between the chair back and the seat frame is 103 degrees, and the normal sitting posture requirement is met.

[0016] When the chair back is stressed, the upper part of the chair back rotates backward around the back rotating shaft, and the angle between the chair back and the seat frame can be increased to 118 degrees, and at the same time, the lower part of the chair back is pushed forward to strengthen the support of the waist.

[0017] Preferably, the back limiting tooth cooperates with the aluminum alloy connecting piece to form a limiting support in a non-stressed state.

[0018] Preferably, the seat frame is fixed on the foot stand by a screw rod.

[0019] Compared with the prior art, the technical effects and advantages of the utility model are:

[0020] (1) The utility model realizes full-automatic self-adaptive adjustment of the chair back, and completely gets rid of the limitation of manual operation of the prior art. Most of the existing adjustable chair backs need users to manually adjust the angle through knobs, pull rods and the like, the adjustment process is easy to interrupt the sitting posture and attention, and there is a use threshold for groups such as the elderly and children; while the structure is linked through the torsion spring assembly and the aluminum alloy connecting piece, and only relies on the natural stress of the user sitting to trigger the adjustment, automatically adapts the support angle when stressed, and automatically resets when getting up, without any manual operation, greatly improving the use convenience and adaptation efficiency.

[0021] (2) Most of the prior art is fixed gear adjustment, and it is difficult to continuously adapt according to the real-time sitting force and body curve of the user, and it is easy to cause the waist to be suspended or the back to be pressed; the structure realizes continuous adjustment through the elastic deformation of the torsion spring, and the lower half of the chair back can actively push the waist forward when stressed, forming a support effect that fits the human body, effectively dispersing the lumbar spine pressure, and the limiting design in the non-stressed state ensures the stability of the basic sitting posture, fundamentally improving the fatigue caused by long sitting and improving the overall support comfort.

[0022] (3) The prior art often causes shaking and jamming after long-term use due to simple connection structure and poor component compatibility, and it is difficult to adapt to different use scenarios; while the structure strengthens the connection stability through multiple bolt locking and gasket wear-resistant design, the buckle type decorative cover takes into account protection and convenient maintenance, the foot stand connected by the screw rod is adaptively designed to be able to flexibly switch between multiple use scenarios, the precise cooperation of the aluminum alloy connecting piece and the torsion spring reduces the invalid loss of components, prolongs the overall service life of the product, and takes into account the practicability and economy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structure schematic view of the seat frame of the utility model installed on the steel frame;

[0024] Figure 2 It is an explosion view of the utility model;

[0025] Figure 3 It is a structure schematic view of the chair back and the seat frame connection of the utility model;

[0026] Figure 4 It is a structure schematic view of the left torsion spring, the left torsion shaft bolt and the left aluminum alloy connecting piece of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the chair back of this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the bracket of this utility model installed on the bow-shaped frame;

[0029] Figure 7 This is a schematic diagram of the structure of the base of this utility model mounted on a four-legged frame.

[0030] In the diagram: 1. Chair back; 2. Seat frame; 3. Legs; 4. Left torsion spring; 5. Right torsion spring; 6. Left aluminum alloy connector; 7. Right aluminum alloy connector; 8. Washer A; 9. Washer B; 10. Right torsion shaft bolt; 11. Left torsion shaft bolt; 12. Decorative cover A; 13. Decorative cover B; 14. Seat-back connecting bolt A; 15. Seat-back connecting bolt B; 16. Seat-back connecting bolt C; 17. Seat-back connecting bolt D; 18. Back rotation shaft; 19. Back limiting tooth; 20. Positioning groove A; 21. Positioning groove B; 22. Buckle; 23. Locking position; 24. Insertion groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The following combination Figures 1 to 7 This application will be described in further detail;

[0033] This application discloses a chair back structure with adaptive adjustment function, including a chair back 1, a seat frame 2 and a torsion spring assembly;

[0034] The torsion spring assembly is connected to the backrest 1 and the seat frame 2 through an aluminum alloy connector, forming a linkage mechanism that can adaptively adjust the angle of the backrest 1, so that the backrest 1 can automatically adjust to the optimal support position when subjected to force; during the adaptive adjustment process, the torsion spring assembly stores and releases energy through elastic deformation, thereby achieving automatic reset and continuous adjustment of the position of the backrest 1.

[0035] The torsion spring assembly includes a left torsion spring 4 and a right torsion spring 5. One end of its pin is fixed in the positioning groove A20 on the left and right sides of the chair back 1, respectively, and the other end is fixed in the positioning groove B21 on the left aluminum alloy connector 6 and the right aluminum alloy connector 7, respectively, forming an angle difference of 45 degrees.

[0036] The left torsion spring 4 and right torsion spring 5 correspond to the two sides of the chair back 1, and the pin fixing positions form a 45-degree angle difference, which can generate a balanced torsional torque, ensuring that the adjustment speed and angle of the left and right sides of the chair back 1 are consistent, avoiding one-sided jamming or tilting, and making the backrest 1 tilting back and returning to its original position more smoothly. One end of the spring pin is fixed to the positioning groove A20 of the chair back 1, and the other end is fixed to the positioning groove B21 of the aluminum alloy connector. The double positioning groove design can limit the positional displacement of the spring during the force and deformation process, preventing the spring from falling off or misaligning and causing the adjustment function to fail. At the same time, it ensures that the spring force is stably transmitted to the chair back 1, improving the reliability of adjustment.

[0037] The aluminum alloy connectors include a left aluminum alloy connector 6 and a right aluminum alloy connector 7. The left aluminum alloy connector 6 and the right aluminum alloy connector 7 are locked to the chair back 1 by a left torsion shaft bolt 11 and a right torsion shaft bolt 10, respectively, and are provided with decorative covers A12 and decorative covers B13 for appearance protection.

[0038] The left torsion shaft bolt 11 and the right torsion shaft bolt 10 are respectively installed through the left aluminum alloy connector 6 and the right aluminum alloy connector 7, and a washer B9 is provided between the left torsion shaft bolt 11 and the left aluminum alloy connector 6, and a washer A8 is provided between the right torsion shaft bolt 10 and the right aluminum alloy connector 7.

[0039] After the left and right aluminum alloy connectors 6 and 7 are respectively positioned and inserted into the left and right sides of the seat frame 2, the backrest 1 and the seat frame 2 are stably connected by the seat back connecting bolts A14, B15, C16 and D17.

[0040] The left aluminum alloy connector 6 and the right aluminum alloy connector 7 are locked to the backrest 1 by the left torsion shaft bolt 11 and the right torsion shaft bolt 10. The bolt connection has high strength and can resist the torsional force when the backrest 1 is adjusted, preventing the connector from separating from the backrest 1. At the same time, the four sets of seat back connecting bolts fix the backrest 1 and the seat frame 2 in a symmetrical distribution, which can evenly distribute the pressure and prevent a single bolt from breaking due to excessive load, further improving the structural safety.

[0041] The shim B9 between the left torsion shaft bolt 11 and the left aluminum alloy connector 6, and the shim A8 between the right torsion shaft bolt 10 and the right aluminum alloy connector 7, can isolate the direct friction between the bolt and the connector, avoiding metal wear caused by long-term adjustment; at the same time, the shims can disperse the pressure when the bolt is tightened, preventing the aluminum alloy connector from being pressed into a dent by the bolt, and protecting the integrity of the components.

[0042] Bolt connections are simple to operate, facilitating batch assembly during production and subsequent maintenance, such as component replacement. The aluminum alloy connectors have strong structural adaptability, simultaneously supporting functions such as torsion spring fixing, chair back 1 connection, and seat frame 2 docking, reducing the types of components and lowering production and inventory costs.

[0043] Decorative cover A12 and decorative cover B13 are respectively provided with buckles 22, and left aluminum alloy connector 6 and right aluminum alloy connector 7 are respectively provided with locking positions 23 corresponding to buckles 22. By buckling 22 with locking positions, the assembly of decorative cover A12 with left aluminum alloy connector 6 and the assembly of decorative cover B13 with right aluminum alloy connector 7 can be realized.

[0044] The decorative cover completely conceals the gaps and metal edges of bolts and connectors, resulting in a cleaner and more uniform appearance on the side of the chair back 1. This prevents users from being scratched by sharp edges on their clothing or skin. It also prevents dust and debris from entering the connectors, preventing impurities from affecting bolt loosening or spring adjustment, thus reducing maintenance frequency. Installation is achieved through the snap-fit ​​connection between clips 22 and slots 23, requiring no additional screws or tools. Assembly is simple; just align and press to secure, significantly improving assembly efficiency. Disassembly is equally efficient; simply pry off clips 22 without damaging the connectors or decorative cover, facilitating subsequent inspection of internal components.

[0045] The backrest 1 is provided with a back rotation shaft 18 on both sides, which is connected to the right torsion shaft bolt 10 and the left torsion shaft bolt 11, and a back limit tooth 19 that is connected to the insertion groove 24 on the left aluminum alloy connector 6 and the right aluminum alloy connector 7.

[0046] When the backrest 1 is not under stress, the torsion spring assembly pushes the backrest 1 forward, and the front end of the back limit tooth 19 is locked with the aluminum alloy connector. The angle between the backrest 1 and the seat frame 2 is 103 degrees, which meets the requirements of normal sitting posture. The back limit tooth 19 cooperates with the aluminum alloy connector to form a limiting support when not under stress.

[0047] When the chair back 1 is under stress, the upper part of the chair back 1 rotates backward around the back rotation axis 18, and the angle between the chair back 1 and the seat frame 2 can be increased to 118 degrees. At the same time, the lower part of the chair back 1 pushes forward to enhance the support for the waist.

[0048] The backrest rotation axis 18 provides a fixed rotation center for the adjustment of the chair back 1, ensuring a stable path when the upper part of the chair back 1 is tilted back, preventing offset or wobbling during adjustment. Simultaneously, the 103° angle is the unloaded angle, conforming to a normal ergonomic sitting posture, while the 118° maximum load angle design adapts to relaxation needs and is ergonomically optimized to fit the back curve of most users, reducing lower back and back fatigue during prolonged sitting. When under load, the lower part of the chair back 1 pushes forward, actively filling the gap between the lower back and the chair back 1, solving the problem of the lower back being unsupported in traditional fixed chair backs, distributing lumbar pressure, and reducing the risk of lumbar muscle strain. When not under load, the backrest limiting teeth 19 are locked in place with the aluminum alloy connector, preventing the chair back 1 from tilting excessively forward, ensuring initial position stability, and preventing the chair back 1 from shifting due to minor collisions.

[0049] The base 2 is fixed to the legs 3 by screws. The legs 3 can be as follows:Figure 1 The steel reinforcement frame shown, such as Figure 6 The bow-shaped frame shown or as Figure 7 The quadrupole shown is 3.

[0050] The screw connection is flexible, allowing the seat frame 2 to be replaced with different types of legs 3, such as steel frame, bow frame, or quadruped 3, depending on the usage scenario (office, home, children's use, etc.), without having to replace the entire backrest 1-seat frame 2 structure. This improves product adaptability and reduces procurement costs for users in different scenarios. The screw connection has high strength, firmly fixing the seat frame 2 and legs 3, preventing the legs 3 from loosening and causing the chair to tip over during use. At the same time, the different characteristics of the legs 3 can meet different needs, allowing the product to cover multiple scenarios such as office, home, and industrial use, expanding the market application scope.

[0051] The specific installation process and functions of this utility model are as follows:

[0052] The first step is the pre-assembly of the chair back 1 with the torsion springs and aluminum alloy connectors. First, place the left torsion spring 4 and the right torsion spring 5 on the left and right sides of the chair back 1 between the corresponding aluminum alloy connectors, so that one end of the spring pin is fixed in the positioning groove A20 of the chair back 1 and the other end is fixed in the positioning groove B21 of the aluminum alloy connector, and the left and right springs form a 45-degree angle difference to ensure balanced adjustment; then, use the left torsion shaft bolt 11 and the right torsion shaft bolt 10 to pass through the aluminum alloy connectors and lock them to the chair back 1, respectively. Add washers between the bolts and the connectors to reduce wear. Finally, fasten the decorative cover with buckle 22 to complete the assembly of the upper back part. This step lays the transmission foundation for subsequent adaptive adjustment.

[0053] The second step is the overall connection between the chair back 1 and the seat frame 2. Align the pre-assembled chair back 1 with the seat frame 2, inserting the left and right aluminum alloy connectors 7 into their corresponding slots on the seat frame 2 for initial positioning. Then, use seat-back connecting bolts A14, back connecting bolts B, C, and D to lock the seat frame 2 and the aluminum alloy connectors from multiple angles. The four bolts are symmetrically distributed to evenly distribute the force on the chair back 1, preventing lateral wobbling during adjustment and ensuring a stable connection between the chair back 1 and the seat frame 2, providing structural support for adaptive adjustment.

[0054] The third step is to fix the seat frame 2 and the legs 3. The chair back 1, seat frame 2 and legs 3 are connected together by screws. The legs 3 can be selected as steel frame, bow frame or quadruped 3 according to the needs of the scene. Steel frame is suitable for high-frequency office scenes, bow frame is suitable for home leisure needs, and quadruped 3 focuses on the stability of children and the elderly. The screw connection method allows the product to be flexibly adapted to multiple scenes and reduce the procurement cost of different scenes.

[0055] In terms of functionality, the core of this structure is an adaptive adjustment driven by a torsion spring. When no force is applied, the torsion spring pushes the backrest 1 forward, and the back limit tooth 19 locks against the aluminum alloy connector, maintaining a 103-degree angle between the backrest 1 and the seat frame 2. This angle conforms to the normal ergonomic sitting posture, allowing the back to naturally conform to the backrest 1 and reducing muscle tension from prolonged sitting. When the user leans back and applies pressure, the backrest 1 overcomes the spring force and tilts back around the backrest rotation axis 18, with the angle increasing to a maximum of 118 degrees. At the same time, the lower half of the backrest 1 pushes forward, actively filling the gap in the waist, strengthening lumbar support, and adapting to the relaxation needs of different leaning pressures.

[0056] Furthermore, the structural design also offers advantages in convenience and safety. The adaptive adjustment requires no manual operation; it adjusts upon application of force and automatically resets when the user stands up, avoiding interruptions to the user's focus. The decorative cover protects the metal edges and dust, the combination of bolts and washers extends the life of components, and the backrest limit teeth 19 prevent the backrest from tilting too far forward. These multiple design features allow the product to achieve its core adjustment functions while also ensuring a good user experience and long-term durability.

[0057] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A chair back structure having a self-adjusting function, characterized by, The utility model relates to a chair back (1), seat frame (2) and torsion spring assembly, and the torsion spring assembly is connected with the chair back (1) and seat frame (2) through aluminum alloy connecting piece, forms the linkage mechanism that can self -adaptive adjustment chair back (1) angle, makes chair back (1) can automatically adjust to the best support position when being forced, and the torsion spring assembly stores and releases energy through elastic deformation in the self -adaptive adjustment process, realizes the automatic reset and continuous adjustment of chair back (1) position. The torsion spring assembly includes left torsion spring (4) and right torsion spring (5), and the pin one end is fixed in the positioning groove A (20) of the left and right sides of chair back (1) respectively, the other end is fixed in the positioning groove B (21) on left aluminum alloy connecting piece (6) and right aluminum alloy connecting piece (7) respectively, and forms the angle difference of 45 degrees. The aluminum alloy connecting piece includes left aluminum alloy connecting piece (6) and right aluminum alloy connecting piece (7), and left aluminum alloy connecting piece (6) and right aluminum alloy connecting piece (7) are locked with chair back (1) through left torsion shaft bolt (11) and right torsion shaft bolt (10) respectively, and are equipped with decorative cover A (12) and decorative cover B (13) to carry out appearance protection. Left torsion shaft bolt (11) and right torsion shaft bolt (10) are arranged through left aluminum alloy connecting piece (6) and right aluminum alloy connecting piece (7) respectively, and left aluminum alloy connecting piece (6) is equipped with gasket B (9) between left torsion shaft bolt (11), and right aluminum alloy connecting piece (7) is equipped with gasket A (8) between right torsion shaft bolt (10).

2. The chair back structure having a self-adjusting function according to claim 1, wherein: Decorative cover A (12) and decorative cover B (13) are equipped with buckle (22) respectively, left aluminum alloy connecting piece (6) and right aluminum alloy connecting piece (7) are equipped with the clamping (23) of corresponding buckling of buckle (22) respectively, realize the assembly of decorative cover A (12) and left aluminum alloy connecting piece (6) and realize the assembly of decorative cover B (13) and right aluminum alloy connecting piece (7) through the buckling of buckle (22) and clamping (23). After left aluminum alloy connecting piece (6) and right aluminum alloy connecting piece (7) are positioned and inserted on the left and right sides of seat frame (2) respectively, chair back (1) is stably connected with seat frame (2) through seat back connecting bolt A (14), seat back connecting bolt B (15), seat back connecting bolt C (16) and seat back connecting bolt D (17).

3. The chair back structure having an adaptive adjustment function according to claim 2, characterized in that: Chair back (1) is equipped with back rotating shaft (18) connected with right torsion shaft bolt (10) and left torsion shaft bolt (11) respectively on both sides, and back limiting tooth (19) is inserted and limited in the insertion slot (24) on left aluminum alloy connecting piece (6) and right aluminum alloy connecting piece (7).

4. The chair back structure having an adaptive adjustment function according to claim 3, characterized in that: When chair back (1) is not forced, the front end of back limiting tooth (19) is deadlocked with aluminum alloy connecting piece, the included angle of chair back (1) and seat frame (2) is 103 degrees, and the normal sitting posture requirement is met.

5. The chair back structure having an adaptive adjustment function according to claim 4, characterized in that: When chair back (1) is forced, the upper half of chair back (1) rotates backward around back rotating shaft (18), the angle of chair back (1) and seat frame (2) can increase to 118 degrees, and the lower half of chair back (1) is pushed forward to strengthen the support of waist. ​ ​ 6. The chair back structure having an adaptive adjustment function according to claim 1, characterized in that: The seat frame (2) is fixed to the foot frame (3) by a screw rod.

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