Office chair with load-bearing self-adjusting function

Abstract

The application discloses an office chair with load-bearing self-adjusting function, which comprises a seat main body, a back main body, a reclining elastic assembly, a reclining locking assembly and a moving support assembly. The seat main body is installed on the moving support assembly through the reclining elastic assembly. The back main body is rotationally connected to the top of the reclining elastic assembly. The reclining elastic assembly comprises a supporting bracket, an elastic adjusting bracket and a load-bearing linkage bracket. The application forms a three-point rotation one-fixed elastic parallelogram linkage structure through the fixed elastic rotating part and the elastic supporting part of the supporting bracket, the load-bearing linkage bracket and the elastic adjusting bracket which are hingedly matched with each other. The elastic deformation between the elastic supporting part and the elastic rotating part is increased with the increase of the weight of a user, the amplitude of the elastic deformation is synchronously increased, the elastic supporting reaction force is also increased, the automatic adaptive adjustment of the supporting force is realized, no independent elastic part needs to be additionally configured, the number of components is reduced, and the assembly cost is lowered.

Description

Technical Field

[0001] This invention belongs to the field of office chair technology, specifically relating to an office chair with self-adjusting load-bearing function. Background Technology

[0002] In existing technology, the self-adjusting weight-bearing function of office chairs typically refers to the ability of the chair back to automatically adjust its tilt force according to the user's weight, ensuring appropriate support for people of different weights. Office chairs with self-weight-bearing capabilities can automatically adapt to the user's weight, providing appropriate resistance when reclining, whether the user is light or heavy, making it easy to stand up and recline.

[0003] Chinese patent publication number "CN221229034U" discloses an office chair base structure, including a connecting seat for connecting chair legs, a rotating seat for mounting the chair back, and a seat bracket for mounting the seat cushion. The connecting seat is inserted into the top of the chair legs below, and the rotating seat is rotatably mounted behind the connecting seat. A hinge groove is provided above the rotating seat, and a connecting rod is provided in the hinge groove. The connecting seat, rotating seat, seat bracket, and connecting rod are sequentially hinged to form a four-bar linkage mechanism.

[0004] The aforementioned patent achieves load-bearing self-adjustment by setting an elastic support mechanism consisting of a limiting plate and two elastic blocks between the rotating seat and the connecting seat, combined with a four-bar linkage structure formed by hinges. However, in the above structure, the position of the elastic support mechanism is fixed, and the change of elastic force depends entirely on the deformation reaction force generated by the compression of the elastic blocks themselves. The adjustment range is limited, and the elastic blocks are prone to fatigue and aging after long-term pressure, resulting in a gradual decrease in support force and an inability to maintain a stable self-adjustment effect for a long time. At the same time, the structure requires additional independent elastic components, resulting in a large number of parts and high assembly costs. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides an office chair with a load-bearing self-adjusting function, which solves the technical problems of limited elasticity adjustment range, easy aging and failure of elastic components, and high assembly cost of multiple parts in the load-bearing self-adjusting structure of existing office chairs.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows: An office chair with a self-adjusting load-bearing function includes a seat body, a backrest body, a tilt elastic component, a tilt locking component, and a movable support component. The seat body is mounted on the movable support component via the tilt elastic component. The backrest body is rotatably connected to the top of the tilt elastic component.

[0007] The tilting elastic component includes a support bracket, an elastic adjustment bracket, and a load-bearing linkage bracket. The inner end of the load-bearing linkage bracket is fixed to the movable support component, and the outer end extends upward and is hinged to the support bracket.

[0008] The bottom end of the elastic adjustment bracket is hinged to the load-bearing linkage bracket. The elastic adjustment bracket is provided with an elastic support portion extending towards the support bracket. The outer end of the elastic support portion is hinged to the support bracket, and together with the load-bearing linkage bracket, they form a triangular structure that elastically flips.

[0009] Furthermore, the elastic adjustment bracket includes an upper backrest mounting portion and a lower elastic rotating portion. The backrest body is rotatably connected to the top of the backrest mounting portion. The end of the elastic rotating portion is rotatably connected to the load-bearing linkage bracket. The elastic support portion is fixed to the elastic rotating portion. One outer end of the elastic support portion is hinged to the support bracket. In the initial state, a horizontal support surface is formed between the support bracket and the elastic support portion of the elastic adjustment bracket. The seat body is fixed on the support surface.

[0010] Furthermore, the elastic support includes a diagonal brace section and a support section. The bottom of the diagonal brace section is fixedly connected to the elastic rotating part. The support section is located at the top of the diagonal brace section, with its outer end extending horizontally towards the support bracket, and its end is hinged to the support bracket.

[0011] Furthermore, the load-bearing linkage bracket includes a bottom mounting portion and an upper arc-shaped deformation portion. The bottom mounting portion is fixedly connected to the movable support assembly. The arc-shaped deformation portion extends upward and its end is hinged to the support bracket.

[0012] Furthermore, the bottom mounting portion of the load-bearing linkage bracket has a mounting chamber that mates with the tilt locking assembly. A clearance groove, mates with the locking end of the tilt locking assembly, is provided on the side of the mounting chamber near the bottom of the elastic adjustment bracket. The tilt locking assembly is installed within the mounting chamber, and its locking end can switch between extending from and retracting from the clearance groove. Multiple locking slots are provided on the bottom end of the elastic adjustment bracket.

[0013] Furthermore, the tilt locking assembly includes a mounting base, a locking pin, and a locking control assembly. The mounting base is fixed to the inner wall of the mounting chamber. The locking pin is rotatably connected to the mounting base. The locking control assembly is mounted on the seat body, and its force-applying end is connected to the locking pin, enabling it to apply an outward rotating pulling force or an inward rotating pushing force to the locking pin.

[0014] Furthermore, the locking control assembly includes a locking lever, a limiting elastic element, a transmission torsion spring, a return spring, and a pull cord. The locking lever is rotatably connected to the chair seat body and is maintained or released from its extreme position by the limiting elastic element. The outer end of the pull cord is connected to the locking lever and can pull it when the locking lever rotates. The inner end of the pull cord has a ball head. The ball head is connected to one end of the transmission torsion spring, which is sleeved on the rotating shaft of the locking pin. The other end of the transmission torsion spring is engaged and fixed to the limiting slot on the locking pin. The two ends of the return spring are respectively connected to the ball head at the extension end and the inner wall of the mounting chamber.

[0015] Furthermore, the limiting elastic element is a semi-circular elastic structure. The side of the locking lever has an embedded groove that mates with the limiting elastic element. A clearance opening is provided on the side of the embedded groove near the seat body. The limiting elastic element is embedded and fixed within the embedded groove, and its semi-circular arc surface extends from the clearance opening. The seat body is provided with limiting retaining ribs that mate with the limiting elastic element. In the initial state, the arc-shaped surface of the limiting elastic element extending from the clearance opening is entirely above the limiting retaining ribs.

[0016] Furthermore, a return torsion spring is provided between the chair back body and the chair back mounting part. The two ends of the return torsion spring abut against the side walls of the chair back body and the chair back mounting part, respectively.

[0017] Furthermore, the elastic adjustment bracket is made of elastic material, and the elastic rotating part and the elastic support part of the elastic adjustment bracket are integrally formed.

[0018] Compared with the prior art, the present invention has the following advantages: 1. This invention sets up a hinged support bracket, a load-bearing linkage bracket, and an elastic adjustment bracket with mutually fixed elastic rotating parts and elastic support parts, forming a three-point rotation and one-point fixed elastic parallelogram linkage structure. The elastic deformation between the elastic support part and the elastic rotating part increases synchronously with the increase of the user's weight, and the generated elastic support reaction force also increases accordingly, realizing automatic adaptation and adjustment of the support force. At the same time, there is no need to configure additional independent elastic components, reducing the number of parts and lowering the assembly cost.

[0019] 2. This invention establishes a horizontal support surface by setting up a support bracket and an elastic support portion of an adjustable support bracket, and fixes the main body of the chair seat on the support surface. When users of different weights lean back against the main body of the chair back, the main body of the chair back will drive the elastic adjustment bracket to rotate backward, compressing the distance between the elastic support portion and the elastic rotating portion. At the same time, the elastic rotating portion of the adjustable support bracket will pull the support bracket and its hinged load-bearing linkage bracket to rotate backward with the inner end of the load-bearing linkage bracket as the fulcrum, causing the main body of the chair seat to rotate backward in sync. This allows the tilt angle of the chair seat to adapt to the backward tilt angle of the main body of the chair back, improving the overall comfort when leaning back, while ensuring that the buttocks of the user remain in contact with the chair seat, avoiding the problem of slipping forward.

[0020] 3. By setting up a tilt locking component, the present invention can lock the chair after the elastic adjustment bracket is rotated to the corresponding position. Users can fix the tilt angle of the office chair according to their own needs, making it more flexible to use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the relative positions of the tilt locking component and the elastic adjustment bracket of the present invention. Figure 3 This is a schematic diagram of the tilting elastic component in this invention; Figure 4 This is a schematic diagram showing the relative positions of the support bracket, the elastic adjustment bracket, and the load-bearing linkage bracket in this invention; Figure 5 This is a schematic diagram of the tilt locking component in this invention; Figure 6 This is a schematic diagram showing the relative positions of the locking pin and the locking control component in this invention; Figure 7 This is a schematic diagram showing the relative positions of the limiting elastic element and the limiting retaining rib in this invention.

[0022] Reference numerals in the attached drawings: 1. Seat body; 2. Backrest body; 3. Tilting elastic component; 4. Tilting locking component; 5. Support bracket; 6. Elastic adjustment bracket; 7. Load-bearing linkage bracket; 8. Backrest mounting part; 9. Elastic rotating part; 10. Elastic support part; 10-1. Diagonal brace section; 10-2. Support section; 11. Bottom mounting part; 12. Arc-shaped deformation part; 13. Mounting base; 14. Locking pin; 15. Locking lever; 16. Limiting elastic component; 17. Return spring; 18. Pull cord; 19. Limiting retaining rib; 20. Moving support component. Detailed Implementation

[0023] In the description of this invention, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] like Figure 1 and 2 As shown, an office chair with a self-adjusting load-bearing function includes a seat body 1, a backrest body 2, a tilt elastic component 3, a tilt locking component 4, and a movable support component 20. The seat body 1 is mounted on the movable support component 20 via the tilt elastic component 3. The backrest body 2 is rotatably connected to the top of the tilt elastic component 3, allowing it to tilt backward when subjected to pressure from the user's back. Simultaneously, the tilt elastic component 3 pulls the seat body 1 to tilt backward, achieving adaptive adjustment of the seat body when the user leans back. The tilt locking component 4 locks the tilt angle of the tilt elastic component 3, meeting the user's needs in different postures.

[0026] like Figure 2 and 3 As shown, the tilting elastic component 3 includes a support bracket 5, an elastic adjustment bracket 6, and a load-bearing linkage bracket 7. The inner end of the load-bearing linkage bracket 7 is fixed to the movable support component 20, and its outer end extends upward in an arc shape and is hinged to the support bracket 5. The elastic adjustment bracket 6 includes an upper backrest mounting portion 8 and a lower elastic rotating portion 9. The backrest body 2 is rotatably connected to the top of the backrest mounting portion 8. The end of the elastic rotating portion 9 is rotatably connected to the load-bearing linkage bracket 7. An elastic support portion 10 is provided between the elastic rotating portion 9 and the support bracket 5. One end of the elastic support portion 10 is fixedly connected to the elastic rotating portion 9, and the other end is hinged to the support bracket 5, so that the load-bearing linkage bracket 7, the support bracket 5, and the elastic adjustment bracket 6 form an elastically tilting triangular structure.

[0027] In the initial state, the support bracket 5 and the elastic support part 10 of the elastic adjustment bracket 6 form a horizontal support surface. The seat body 1 is fixed on the support surface. When users of different weights lean back against the backrest body 2, the backrest body 2 will drive the elastic adjustment bracket 6 to rotate backward. The elastic rotating part 9 of the elastic adjustment bracket 6 will pull the support bracket 5 to rotate backward with the inner end of the load-bearing linkage bracket 7 as the fulcrum. During the movement of the support bracket 5, the top of the load-bearing linkage bracket 7 is subjected to tension and deforms, causing the triangular structure composed of the load-bearing linkage bracket 7, the support bracket 5, and the elastic adjustment bracket 6 to flip backward as a whole. This, in turn, causes the seat body 1 to flip backward synchronously, so that the tilt angle of the seat adapts to the backward tilt angle of the backrest body 2.

[0028] Furthermore, such as Figure 4 As shown, the elastic support 10 includes a lower inclined brace section 10-1 and an upper support section 10-2. The bottom of the inclined brace section 10-1 is fixedly connected to the elastic rotating part 9. The inner end of the support section 10-2 is fixed to the top of the inclined brace section 10-1, and the outer end extends horizontally toward the support bracket 5, and the end is hinged to the support bracket 5.

[0029] like Figure 4 As shown, the load-bearing linkage bracket 7 includes a bottom mounting portion 11 and an upper arc-shaped deformation portion 12. The bottom mounting portion 11 is fixedly connected to the movable support assembly 20. The arc-shaped deformation portion 12 extends upwards and its end is hinged to the support bracket 5. When users of different weights sit down and lean back, the greater the weight, the greater the downward pressure on the elastic rotating portion of the elastic adjustment bracket 6. Simultaneously, this increases the backward tilting amplitude of the elastic rotating portion, the support bracket 5, and the arc-shaped deformation portion 12, causing the tilt angle of the chair seat body 1, supported by the arc-shaped deformation portion 12 and the support bracket 5, to automatically adjust according to the user's weight.

[0030] In actual use, when the user leans back, the elastic adjustment bracket 6 rotates around the hinge point with the load-bearing linkage bracket 7. The elastic rotating part 9 swings backward with the rotation, and the inclined support section 10-1 of the elastic support part 10 moves backward synchronously with the elastic rotating part 9. The support section 10-2 rotates synchronously under the influence of the inclined support section 10-1, causing the hinge point between the support section 10-2 and the support bracket 5 to rotate backward in an arc around the hinge point of the elastic rotating part 9 and the load-bearing linkage bracket 7. The support bracket 5, pulled by the support section 10-2, rotates backward around the hinge point at the outer end of the load-bearing linkage bracket, causing the entire chair seat to tilt backward and downward. Simultaneously, during the movement of the support bracket 5, a tensile force is applied to the top of the arc-shaped deformation section of the load-bearing linkage bracket. The arc-shaped deformation part elastically bends inward under the tension of the support bracket. The deformation range increases synchronously with the user's weight and the force of leaning back, and the resulting elastic reaction force also increases synchronously. This automatically increases the support force on the backrest and seat, realizing automatic adjustment of the support force according to the load.

[0031] In this embodiment, the elastic adjustment bracket 6 is made of elastic material, and the elastic rotating part and the elastic support part 10 of the elastic adjustment bracket 6 are integrally formed.

[0032] Furthermore, a return torsion spring is provided between the chair back body 2 and the chair back mounting part 8. The two ends of the return torsion spring abut against the side walls of the chair back body 2 and the chair back mounting part 8, respectively. When the user leans against the chair back body 2, the chair back body 2 rotates around the connecting shaft to compress the return torsion spring. When the user releases the pressure, the return torsion spring uses its own elasticity to drive the chair back body 2 to quickly return to its initial angle.

[0033] Furthermore, the bottom mounting portion 11 of the load-bearing linkage bracket 7 has a mounting chamber that mates with the tilt locking assembly 4. A clearance groove, mates with the locking end of the tilt locking assembly 4, is provided on the side of the mounting chamber near the bottom of the elastic adjustment bracket 6. The tilt locking assembly 4 is installed in the mounting chamber, and its locking end can switch between extending from and retracting from the clearance groove. Multiple locking slots are provided on the bottom of the elastic adjustment bracket 6. These locking slots are evenly spaced at the bottom of the elastic adjustment bracket 6, with the hinge point between the elastic adjustment bracket 6 and the load-bearing linkage bracket 7 as the center.

[0034] In actual use, when the elastic adjustment bracket 6 is rotated backward to the target angle by the pressure of the user's back, the locking end of the tilt locking component 4 passes through the clearance groove and is inserted into the locking groove at the corresponding position of the bottom of the elastic adjustment bracket, thereby locking the rotation position of the elastic adjustment bracket 6 and fixing the tilt angle of the backrest body 2 and the flip angle of the seat body 1.

[0035] like Figure 5 and 6As shown, the tilt locking assembly 4 includes a mounting base 13, a locking pin 14, and a locking control assembly. The mounting base 13 is fixed to the inner wall of the mounting chamber. The locking pin 14 is rotatably connected to the mounting base 13. In the initial state, the locking pin 14 is entirely located within the mounting chamber. The locking control assembly is mounted on the seat body 1, and its force-applying end is connected to the locking pin 14.

[0036] The locking control component has two operating states during use: locked and unlocked. When locked, it applies an outward pulling force to the locking pin 14, maintaining the lock when it rotates into the locking groove. This prevents the elastic adjustment bracket 6 from rotating relative to the load-bearing linkage bracket 7, thus fixing the overall angle of the office chair. When unlocked, it applies an inward pushing force to the locking pin 14, disengaging it from the locking groove at the bottom of the elastic adjustment bracket 6. At this time, the elastic adjustment bracket 6 can rotate freely according to changes in the user's leaning pressure.

[0037] In this embodiment, as Figure 6 and 7 As shown, the locking control assembly includes a locking lever 15, a limiting elastic element 16, a transmission torsion spring, a return spring 17, and a pull cord 18. The locking lever 15 is rotatably connected to the chair seat body 1 and is maintained or released from its extreme rotation position by the limiting elastic element 16. The outer end of the pull cord 18 is connected to the locking lever and can pull it when the locking lever 15 rotates. The inner end of the pull cord 18 has a ball head. The ball head is connected to one end of the transmission torsion spring, which is sleeved on the rotating shaft of the locking pin 14. The other end of the transmission torsion spring is engaged and fixed in a limiting slot on the locking pin 14. The two ends of the return spring 17 are respectively connected to the ball head at the extension end and the inner wall of the mounting chamber.

[0038] In actual use, the user flips the locking lever 15, which drives the ball head of the pull rope 18, compressing the return spring 17. Simultaneously, the transmission torsion spring rotates, pushing the locking pin 14 outward to insert into the corresponding lock slot. At this time, the limiting elastic element 16 maintains the rotational position of the locking lever 15, completing the locking process. When the user flips the locking lever 15 in the opposite direction, the limiting elastic element 16 releases its position restriction on the locking lever 15, the return spring 17 pushes the ball head back to its original position, the pull rope 18 retracts, and the transmission torsion spring rotates in the opposite direction, causing the locking pin 14 to rotate inward to disengage from the lock slot, completing the unlocking process. The elastic adjustment bracket 6 then returns to its movable state.

[0039] Furthermore, the limiting elastic element 16 is an overall semi-circular elastic structure. The locking lever 15 has an inner groove on its side that mates with the limiting elastic element 16. A clearance opening is provided on the side of the inner groove near the seat body 1. The limiting elastic element 16 is embedded and fixed within the inner groove, and its semi-circular arc surface extends from the clearance opening. The seat body 1 is provided with a limiting retaining rib 19 that mates with the limiting elastic element 16. In the initial state, the arc-shaped surface of the limiting elastic element 16 extending from the clearance opening is entirely above the limiting retaining rib 19. The upper and lower edges of the clearance opening on the locking lever 15 are the upper and lower limit positions, respectively, mate with the limiting retaining rib 19.

[0040] In actual use, in the initial state, the limiting rib 19 presses against the lower arc of the limiting elastic member 16, and at this time, the lower limit of the clearance opening on the locking lever 15 is located at the limit rib 19 and abuts against it. When the locking lever 15 is pulled upward to the upper limit position, the limiting elastic member 16 rotates upward with the locking lever 15, and its arc surface deforms when crossing the limiting rib 19, until the arc surface of the limiting elastic member 16 crosses the limiting rib 19, and the upper limit of the clearance opening on the locking lever 15 is located at the limit rib 19 and abuts against it. At this point, the limiting elastic member 16 returns to its original deformation and fixes the position of the locking lever 15, maintaining the current rotation state of the locking lever 15 and ensuring that the locking pin 14 remains in the locked position inserted into the lock groove.

[0041] The working principle of this invention is as follows: In the initial state, both the support bracket 5 and the elastic support portion 10 of the elastic adjustment bracket 6 are in a horizontal state, making the main body 1 of the chair seat horizontal as a whole. The main body 2 of the chair back remains vertical, the locking pin 14 is disengaged from the locking groove, and the overall structure is in a movable state.

[0042] When a user sits down and leans back against the chair back 2, the greater the user's weight, the greater the pressure exerted on the chair back 2. The chair back 2 then causes the elastic adjustment bracket 6 to rotate backward around its hinge point with the load-bearing linkage bracket 7. This rotation of the elastic adjustment bracket 6 pulls the arc-shaped deformation part 12 of the support bracket 5 and the load-bearing linkage bracket 7, causing them to flip backward synchronously around their hinge point. This, in turn, causes the chair seat 1 to tilt backward in sync with the chair back. The greater the user's weight, the greater the backward tilt, and the greater the tilt angle of the chair seat, achieving self-adjusting weight distribution and providing a suitable support posture for users of different weights.

[0043] Once the user adjusts to a suitable tilt angle, they can switch to the locked state by moving the locking lever 15. This will cause the locking pin 14 to insert into the corresponding locking slot, fixing the current tilt angle and meeting the needs of a fixed posture. When the user needs to stand up and release the pressure, they can switch the locking control component to the unlocked state. The elastic support part 10 will return to its original position due to its own elastic deformation. In conjunction with the return torsion spring at the backrest body 2, the backrest body 2, the elastic adjustment bracket 6, the support bracket 5, and the seat body 1 will return to their initial horizontal state.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An office chair with a self-adjusting load-bearing function, comprising a seat body, a backrest body, a tilt elastic component, a tilt locking component, and a movable support component. The seat body is mounted on the movable support component via the tilt elastic component; the backrest body is rotatably connected to the top of the tilt elastic component, characterized in that: The tilting elastic component includes a support bracket, an elastic adjustment bracket, and a load-bearing linkage bracket. The inner end of the load-bearing linkage bracket is fixed to the movable support component, and the outer end extends upward and is hinged to the support bracket. The bottom end of the elastic adjustment bracket is hinged to the load-bearing linkage bracket; the elastic adjustment bracket is provided with an elastic support part extending to one side of the support bracket; the outer end of the elastic support part is hinged to the support bracket, and forms a triangular structure with the load-bearing linkage bracket to form an elastic flipping shape.

2. The office chair with self-adjusting load-bearing function according to claim 1, characterized in that: The elastic adjustment bracket includes an upper backrest mounting part and a lower elastic rotating part; the backrest body is rotatably connected to the top of the backrest mounting part; the end of the elastic rotating part is rotatably connected to the load-bearing linkage bracket; the elastic support part is fixed on the elastic rotating part; one end of the outer end of the elastic support part is hinged to the support bracket; in the initial state, the support bracket and the elastic support part of the elastic adjustment bracket form a horizontal support surface; the seat body is fixed on the support surface.

3. An office chair with self-adjusting load-bearing function according to claim 2, characterized in that: The elastic support includes a bracing section and a support section; the bottom of the bracing section is fixedly connected to the elastic rotating part; the support section is located at the top of the bracing section, with its outer end extending horizontally towards the support bracket, and its end is hinged to the support bracket.

4. An office chair with self-adjusting load-bearing function according to claim 1, characterized in that: The load-bearing linkage bracket includes a bottom mounting part and an upper arc-shaped deformation part; the bottom mounting part is fixedly connected to the movable support assembly; the arc-shaped deformation part extends upward and its end is hinged to the support bracket.

5. An office chair with self-adjusting load-bearing function according to claim 4, characterized in that: The load-bearing linkage bracket has an installation chamber on its bottom mounting part that cooperates with the tilt locking component; a clearance groove is provided on the side of the installation chamber near the bottom end of the elastic adjustment bracket that cooperates with the locking end of the tilt locking component; the tilt locking component is installed in the installation chamber, and the locking end can switch between extending from or retracting from the clearance groove; multiple locking grooves are provided on the bottom end of the elastic adjustment bracket.

6. An office chair with self-adjusting load-bearing function according to claim 5, characterized in that: The tilt locking assembly includes a mounting base, a locking pin, and a locking control assembly. The mounting base is fixed to the inner wall of the mounting chamber. The locking pin is rotatably connected to the mounting base. The locking control assembly is mounted on the seat body, and its force-applying end is connected to the locking pin, enabling it to apply an outward rotating pulling force or an inward rotating pushing force to the locking pin.

7. An office chair with self-adjusting load-bearing function according to claim 6, characterized in that: The locking control assembly includes a locking lever, a limiting elastic element, a transmission torsion spring, a return spring, and a pull cord. The locking lever is rotatably connected to the chair seat body and is maintained or released from its extreme position by the limiting elastic element. The outer end of the pull cord is connected to the locking lever and can pull it when the locking lever rotates. The inner end of the pull cord is provided with a ball head. The ball head is connected to one end of the transmission torsion spring sleeved on the rotating shaft of the locking pin. The other end of the transmission torsion spring is engaged and fixed with the limiting slot on the locking pin. The two ends of the return spring are respectively connected to the ball head of the tension end and the inner wall of the mounting chamber.

8. An office chair with self-adjusting load-bearing function according to claim 7, characterized in that: The limiting elastic element is a semi-circular elastic structure; the side of the locking lever has an embedded groove that mates with the limiting elastic element; the embedded groove has a clearance opening on the side near the seat body; the limiting elastic element is embedded and fixed in the embedded groove, and its semi-circular arc surface extends from the clearance opening; the seat body is provided with a limiting retaining rib that mates with the limiting elastic element; in the initial state, the arc surface of the limiting elastic element extending from the clearance opening is located above the limiting retaining rib.

9. An office chair with self-adjusting load-bearing function according to claim 1, characterized in that: A reset torsion spring is provided between the main body of the chair back and the mounting part of the chair back; the two ends of the reset torsion spring abut against the side walls of the main body of the chair back and the mounting part of the chair back, respectively.

10. An office chair with self-adjusting load-bearing function according to claim 1, characterized in that: The elastic adjustment bracket is made of elastic material, and the elastic rotating part and the elastic support part of the elastic adjustment bracket are integrally formed.

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