Chair back adjusting mechanism and seat

Abstract

The utility model provides a chair back adjusting mechanism and a seat, which comprise a back bracket and a backrest supporting piece, wherein the backrest supporting piece is hinged with the back bracket and forms a hinged end, so that the backrest supporting piece can rotate back and forth relative to the back bracket; an adjusting assembly is arranged between a back support capable of rotating front and back and a backrest supporting piece, so that the backrest supporting piece can swing front and back and stay at a corresponding supporting position; the chair back adjusting mechanism is arranged on the seat, front-back adjustment of the backrest supporting piece can be achieved through the adjusting assembly, the backrest supporting piece can effectively support the backs of sitting persons in different postures, and the use experience feeling of the seat is improved.

Description

Technical Field

[0001] The utility model relates to the field of seats, and particularly to a backrest adjusting mechanism and a seat. Background Art

[0002] In order to ensure that the backrest of an existing adult office chair or a children's study chair can always support the back, a corresponding mechanism is provided between the backrest and the back support. This mechanism can adjust the front and back support positions of the backrest on the back, ensuring the lumbar health of different sitters.

[0003] For example, in the backrest adjusting mechanism patent with the publication number CN219813623, this backrest adjusting mechanism can be used on a study chair. The fixed part is sleeved on the connecting column connected to the chair legs, and the sliding part for connecting the backrest is sleeved on the fixed part and can slide back and forth. A locking part is connected between the sliding part and the fixed part, and the locking part is set as a structure of meshing teeth cooperating with a rotating wrench for easy operation. After the seat position is adjusted to a suitable position, it can be locked, thus providing stable support for the back.

[0004] Another example is in the office chair patent with the publication number CN215737935. The backrest support body is hinged to the upper end of the backrest main body through a first connection component, and an elastic connection is formed between the backrest support body and the lower end of the backrest main body through a second connection component, enabling the backrest main body to rotate up and down. Here, the backrest support body is equivalent to the back support, and the backrest body is equivalent to the backrest. When the back leans on the backrest, the backrest can adaptively adjust following the user's back, thus always supporting the user's lumbar and back regions and effectively relieving the fatigue of the user's lumbar and back.

[0005] However, the above two types of seats can only adjust the back support position by moving the backrest back and forth or rotating it up and down, without considering the actual usage state of the sitter during office work or study. For example, when the sitter is working or studying, their back is not always in a straight state, but leans forward and separates from the backrest, forming an acute angle between the back and the backrest. It is difficult to make the backrest fit the back by adjusting the backrest support position with the mechanisms of the above two types of seats, affecting the use experience of the seat. Summary of the Invention

[0006] In order to solve the above technical problems, the purpose of the utility model is to provide a backrest adjusting mechanism. By arranging an adjusting component between the back support that can rotate back and forth and the backrest support member, the backrest support member can swing back and forth and stay at the corresponding support position.

[0007] Furthermore, a seat is provided. By arranging the backrest adjusting mechanism on the seat, the front and back adjustment of the backrest support member can be realized through the adjusting component, enabling the backrest support member to effectively support the backs of sitters in different postures and improving the use experience of the seat.

[0008] The technical solution of the present utility model is realized as follows:

[0009] A backrest adjusting mechanism, comprising:

[0010] A backrest support; the backrest support is a support member of the backrest adjusting mechanism;

[0011] A backrest supporting member; arranged on the front side of the backrest support; the backrest supporting member is hinged to the backrest support frame and forms a hinged end, so that the backrest supporting member can rotate back and forth relative to the backrest support.

[0012] An adjusting assembly; arranged between the backrest supporting member and the backrest support, and the adjusting assembly is staggered with the hinged end in the height direction; the adjusting assembly can act on the backrest supporting member to make the backrest supporting member rotate back and forth along the hinged end and stay at the corresponding position.

[0013] Preferably, the backrest supporting member includes a backrest main body and a connecting portion connected to the rear end of the backrest main body, the backrest support includes a support main body and a mounting seat connected to the front end of the support main body, and the adjusting assembly is located between the connecting portion and the mounting seat; the adjusting assembly includes a sliding seat that can slide longitudinally on the mounting seat, a driving assembly is connected to the sliding seat, and the driving assembly can drive the sliding seat to slide up and down; a linkage mechanism is arranged between the sliding seat and the connecting portion, and the linkage mechanism can respond to the acting force of the sliding seat sliding up and down and link the backrest supporting member to rotate back and forth and stay at the corresponding position; the driving assembly provides linkage power for the sliding seat to make the sliding seat trigger the operation of the linkage mechanism, with a simple design and ingenious concept.

[0014] Preferably, the driving assembly includes a slider that can slide left and right, and a driving member for driving the slider to slide left and right is connected to the slider; a transmission structure is arranged between the slider and the sliding seat; the transmission structure can drive the driving member to drive the slider to slide left and right and drive the sliding seat to slide longitudinally on the mounting seat.

[0015] Preferably, the transmission structure is a chute and slide bar structure; the chute is an inclined guide groove opened on the sliding seat, and the inclined guide groove extends longitudinally; the slide bar is an insertion post arranged on the slider, and the insertion post is slidably connected in the inclined guide groove; when the slider slides left and right, it can drive the insertion post to slide in the inclined guide groove, thereby making the sliding seat slide up and down; the chute and slide bar structure is simple and efficient, and by pressing the wall of the inclined guide groove with the insertion post, the lateral movement of the slider can be converted into the longitudinal movement of the sliding seat.

[0016] Preferably, a transmission screw hole is opened on the slider, and the axis direction of the transmission screw hole is the same as the sliding direction of the slider; the driving member is a screw post that is helically engaged in the transmission screw hole, and one end of the screw post away from the slider is connected with a handle, and the handle drives the screw post to rotate in place under the action of an external force, thereby driving the slider to slide in the left and right direction; the design of the helical fit is simple and labor-saving, and when adjusting the front and rear positions of the backrest supporting member, only the handle needs to be rotated.

[0017] Preferably, the spiral column includes an outer spiral sleeve and a driving insertion rod that are spirally engaged in the driving spiral hole, and the handle is connected to the outer end of the driving insertion rod; the outer spiral sleeve includes a driving slot inside itself, and the driving insertion rod is inserted into the driving slot to drive the outer spiral sleeve to rotate circumferentially; the split design of the driving insertion rod and the outer spiral sleeve enables the outer spiral sleeve to be first fitted into the spiral hole of the slider, and then the driving insertion rod is inserted into the driving slot by means of insertion, simplifying the installation process of the spiral column.

[0018] Preferably, the cross-sectional shape of the driving slot is polygonal or cruciform or gear-shaped, and the cross-sectional shape of the driving insertion rod matches the cross-sectional shape of the driving slot.

[0019] Preferably, the inclination angle of the inclined guide groove relative to the vertical axis is 45°; the inclination angle of 45° can keep the driving force received by the sliding seat within a reasonable range, and make the lateral movement distance of the slider and the vertical movement distance of the sliding seat the same.

[0020] Preferably, the mounting seat is provided with a sliding guide groove extending longitudinally, and the sliding seat slides longitudinally in the sliding guide groove; the slider is located in the sliding guide groove and slides between the left and right side walls in the sliding guide groove; the sliding guide groove can provide sliding guidance for the sliding seat, accommodate the slider at the same time, and limit the lateral sliding range of the slider, with a clever design and two birds with one stone.

[0021] Preferably, the slider is provided with ribs extending left and right, and grooves are provided on the corresponding wall surfaces of the sliding guide groove. The ribs cooperate with the grooves to form sliding guidance for the slider; making the slider more stable when sliding left and right.

[0022] Preferably, the linkage mechanism includes a linkage cross bar and a linkage chute. The linkage cross bar is transversely inserted between the sliding seat and the connecting part, the linkage chute is arranged on the sliding seat or the connecting part, and the linkage chute extends obliquely longitudinally. The linkage cross bar is slidably connected in the linkage chute; when the sliding seat slides longitudinally, the linkage rod can slide in the linkage chute and drive the backrest support to rotate forward and backward and stay in the corresponding position; the linkage cross bar can generate a force acting on the backrest support by pressing the groove wall of the inclined linkage chute, with a simple design and a clever structure.

[0023] Preferably, the connecting part is a cover shell, and the cover shell has an avoidance cavity with an open rear end. When the backrest support rotates forward and backward along the hinge end, the avoidance cavity avoids the mounting seat and ensures that the sliding seat is never exposed.

[0024] Preferably, the backrest support includes a backrest main body and a connecting portion connected to the rear end of the backrest main body, and the adjusting assembly is disposed between the connecting portion and the backrest bracket; the adjusting assembly is a telescopic rod, and the telescopic rod includes a fixed column and a movable column sleeved with each other, and the fixed column and the movable column are respectively connected to the mounting seat and the connecting portion; a control mechanism is provided between the fixed column and the movable column, and the control mechanism includes a plurality of gear holes arranged along the length direction of the fixed column. A receiving groove is provided on the column body of the movable column, and an elastically telescopic limiting sphere is provided in the receiving groove. Under the action of an external force, the movable column is driven to expand and contract, and the limiting sphere can switch between corresponding gear holes while elastically expanding and contracting, so that the backrest support rotates forward and backward along the hinge end and stays at the corresponding position; the adjustment process of the backrest support is simplified to the process of the telescopic rod expanding and contracting back and forth, and the design is simple and delicate.

[0025] Preferably, the movable column is hinged to the connecting portion; alternatively, the fixed column is hinged to the mounting seat; the hinge design can prevent the telescopic rod from jamming during expansion and contraction, and make the backrest support more smooth when adjusting forward and backward.

[0026] Preferably, there are a plurality of the telescopic rods arranged at intervals along the longitudinal direction between the mounting seat and the connecting portion; the plurality of telescopic rods can provide sufficient telescopic adjustment force when the backrest support is adjusted forward and backward, and can also form a stable support for the backrest support when the backrest support is adjusted to the corresponding position.

[0027] Furthermore, a seat is provided, including the above-mentioned backrest adjusting mechanism.

[0028] The beneficial effects of the present invention adopting the above technical solutions are as follows:

[0029] 1. When the sitter is working or studying, his back will maintain a forward-leaning state. At this time, the upper end of the backrest support can be tilted forward and fitted to the back through the adjusting assembly, so that the backrest support forms a support for the back. When the sitter is resting, the position of the backrest support can be adjusted to the upright state or the reclined state again through the adjusting assembly, which is suitable for different sitting needs and improves the use experience of the seat.

[0030] 2. The slider and the sliding seat are matched through a chute and slide bar structure, so that the sliding seat can move up and down. A linkage mechanism is provided between the sliding seat that moves up and down and the backrest support. The linkage mechanism also adopts a chute and slide bar matching structure to link the backrest support to swing back and forth. The design structure is simple and efficient, and the backrest support is adjusted back and forth only through two chute and slide bar structures at different positions.

[0031] 3. The slider in the driving member is driven by a spiral fit, so that the sitter only needs to turn the handle at the outer end of the screw rod to make the backrest support swing back and forth; at the same time, the spiral driving method makes the backrest support swing back and forth at a uniform and stable speed, so that the backrest support can stay and be in place at different front and back positions. Brief Description of the Drawings

[0032] Figure 1 Figure showing the backrest support in an upright state;

[0033] Figure 2 Figure showing the backrest support in a forward-tilted state;

[0034] Figure 3 Structural schematic diagram of the backrest adjusting mechanism;

[0035] Figure 4 Exploded view of the backrest adjusting mechanism;

[0036] Figure 5 Structural schematic diagram of the driving component in the sliding guide groove;

[0037] Figure 6 Exploded view of the driving component;

[0038] Figure 7 Enlarged view of the cooperation between the sliding seat and the driving component;

[0039] Figure 8 Structural schematic diagram of the backrest adjusting mechanism in Embodiment 2;

[0040] Each reference numeral is: 1a - back bracket, 1 - mounting seat, 2 - backrest support, 3 - driving component, 4 - telescopic rod, 11 - sliding guide groove, 12 - side wall surface, 13 - groove, 14 - kidney-shaped relief groove, 21 - connecting part, 22 - avoidance cavity, 23 - backrest main body, 31 - transmission plug rod, 32 - handle, 33 - outer spiral sleeve, 34 - slider, 35 - sliding seat, 36 - linkage cross bar, 41 - fixed column, 42 - movable column, 43 - gear hole, 44 - accommodating groove, 45 - limiting sphere, 46 - compression spring, 341 - plug post, 342 - transmission spiral hole, 343 - rib, 351 - inclined guide groove, 352 - linkage chute, A - hinge end. Detailed Description of the Embodiment

[0041] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0042] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0043] The present utility model has multiple embodiments, and the specific implementation manners are as follows:

[0044] Embodiment 1: As Figures 1-7 shown, the present utility model provides a backrest adjusting mechanism, including:

[0045] A backrest support 1a; the backrest support 1a is a support member of the backrest adjusting mechanism;

[0046] A backrest supporting member 2; arranged on the front side of the backrest support 1a; the backrest supporting member 2 is hinged to the backrest support frame and forms a hinge end A, enabling the backrest supporting member 2 to rotate back and forth relative to the backrest support 1a;

[0047] An adjusting assembly; arranged between the backrest supporting member 2 and the backrest support 1a, and the adjusting assembly is offset from the hinge end A in the height direction; the adjusting assembly can be located above or below the hinge end A; the adjusting assembly can act on the backrest supporting member 2 to make the backrest supporting member 2 rotate back and forth along the hinge end A and stay at a corresponding position.

[0048] Furthermore, the backrest supporting member 2 includes a backrest main body 23 and a connecting portion 21 connected to the rear end of the backrest main body 23. The backrest support 1a includes a support frame main body and a mounting seat 1 connected to the front end of the support frame main body. The mounting seat 1 is an intermediate carrier for connecting the backrest supporting member 2 and the backrest support 1a. The adjusting assembly is located between the connecting portion 21 and the mounting seat 1. Specifically, the adjusting assembly includes a sliding seat 35 that can slide longitudinally on the mounting seat 1. A driving assembly 3 is connected to the sliding seat 35, and the driving assembly 3 can drive the sliding seat 35 to slide up and down. A linkage mechanism is provided between the sliding seat 35 and the connecting portion 21. The linkage mechanism can respond to the acting force of the sliding seat 35 sliding up and down and link the backrest supporting member 2 to rotate back and forth and stay at a corresponding position. The driving assembly 3 provides linkage power for the sliding seat 35 to trigger the operation of the linkage mechanism. The design is simple and ingenious.

[0049] Furthermore, the driving component 3 drives the sliding seat 35 to slide up and down in the following manner: The driving component 3 includes a slider 34 that can slide left and right, and a driving member is connected to the slider 34 to drive the slider 34 to slide left and right; a transmission structure is provided between the slider 34 and the sliding seat 35; the transmission structure can drive the driving member to drive the slider 34 to slide left and right, and drive the sliding seat 35 to slide longitudinally on the mounting seat 1; specifically, the transmission structure is a chute and sliding rod structure; the chute is an inclined guide groove 351 formed on the sliding seat 35, and the inclined guide groove 351 extends obliquely along the longitudinal direction; the sliding rod is a plug post 341 provided on the slider 34, and the plug post 341 is slidably connected in the inclined guide groove 351; when the slider 34 slides left and right, it can drive the plug post 341 to slide in the inclined guide groove 351, thereby causing the sliding seat 35 to slide up and down; in this embodiment, to ensure the stable sliding of the sliding seat 35, the number of inclined guide grooves 351 is at least two spaced left and right, and the number of plug posts on the slider 34 corresponds to the number of inclined guide grooves 351; the chute and sliding rod structure is simple and efficient, and by the plug post 341 pressing against the groove wall of the inclined guide groove 351, the lateral movement of the slider 34 can be converted into the longitudinal movement of the sliding seat 35.

[0050] Furthermore, the driving member drives the slider 34 to slide left and right in a spiral cooperation manner. Specifically, a transmission spiral hole 342 is formed in the slider 34, and the axial direction of the transmission spiral hole 342 is the same as the sliding direction of the slider 34; the driving member is a spiral column spirally engaged in the transmission spiral hole 342, and one end of the spiral column away from the slider 34 is connected with a handle 32. When an external force acts on the handle 32, it drives the spiral column to rotate in place, thereby driving the slider 34 to slide in the left and right directions; the design of spiral cooperation is simple and labor-saving. When adjusting the front and rear positions of the backrest support member 2, only the handle 32 needs to be rotated.

[0051] Furthermore, for the convenience of installation, the spiral column is of a split structure. Specifically, the spiral column includes an outer spiral sleeve 33 spirally engaged in the transmission spiral hole 342 and a transmission plug rod 31, and the handle 32 is connected to the outer end of the transmission plug rod 31; the outer spiral sleeve 33 includes a transmission slot 331 inside itself, and the transmission plug rod 31 is inserted into the transmission slot 331 to drive the outer spiral sleeve 33 to rotate circumferentially; the split design of the transmission plug rod 31 and the outer spiral sleeve 33 enables the outer spiral sleeve 33 to be first fitted into the spiral hole 342 of the slider 34, and then the transmission plug rod 31 is inserted into the transmission slot 331 by a plugging method, simplifying the installation process of the spiral column.

[0052] Furthermore, in this embodiment, the cross-sectional shape of the transmission slot 331 is polygonal or cross-shaped or gear-shaped, and the cross-sectional shape of the transmission plug rod 31 matches the cross-sectional shape of the transmission slot 331; these shapes can transmit the force generated by rotation to the outer spiral sleeve 33 after the transmission plug rod 31 and the transmission slot 331 are fitted, so as to drive the slider 34 to slide left and right.

[0053] Furthermore, the driving force and the sliding stroke of the sliding seat 35 during up-and-down sliding should be within a reasonable range. Therefore, in this embodiment, the inclination angle of the inclined guide groove 351 relative to the vertical axis is 45°. An inclination angle of 45° can keep the driving force of the sliding seat 35 within a reasonable range and make the left-right lateral movement distance of the slider 34 the same as the up-and-down sliding distance of the sliding seat 35. If the angle is greater than 45°, the extrusion force of the plug post 341 on the groove wall of the inclined guide groove 351 will be too large. If the angle is less than 45°, although the extrusion force of the plug post 341 on the groove wall of the inclined guide groove 351 is small, the up-and-down sliding stroke of the sliding seat 35 will also decrease. Therefore, in this embodiment, the deflection angle of the inclined guide groove 351 is 45°, which not only ensures the sliding stroke of the sliding seat 35 but also makes the driving force of the sliding seat 35 from the slider 34 more reasonable.

[0054] Furthermore, for the convenience of guiding, a sliding guide groove 11 extending longitudinally is provided on the mounting seat 1, and the sliding seat 35 slides longitudinally in the sliding guide groove 11. In order to make rational use of space, the slider 34 is located in the sliding guide groove 11 and slides between the left and right side walls of the sliding guide groove 11. The sliding guide groove 11 can provide sliding guidance for the sliding seat 35 and accommodate the slider 34 at the same time. The sliding guide groove 11 has left and right opposite side wall surfaces 21a, and the side wall surfaces 21a can limit the left-right sliding range of the slider 34 and keep the up-and-down movement range of the sliding seat 35 reasonable. The design is ingenious and serves two purposes at once.

[0055] Furthermore, for the convenience of guiding, rib strips 343 extending left and right are provided on the slider 34, and grooves 13 are provided on the corresponding wall surfaces of the sliding guide groove 11. The rib strips 343 cooperate with the grooves 13 to form sliding guidance for the slider 34, making the slider 34 more stable during left-right sliding.

[0056] Furthermore, the linkage mechanism responds to the force of the sliding seat 35 and drives the backrest support 2 as follows: The linkage mechanism includes a linkage cross bar 36 and a linkage chute 352. The linkage cross bar 36 is horizontally arranged between the sliding seat 35 and the connecting part 21, and the linkage chute 352 is arranged on the sliding seat 35 or the connecting part 21. In this embodiment, the linkage chute 352 is arranged on the sliding seat 35 and extends obliquely longitudinally. The linkage cross bar 36 is slidably connected in the linkage chute 352. When the sliding seat 35 slides longitudinally, the linkage rod can slide in the linkage chute 352 and drive the backrest support 2 to rotate forward and backward and stay at the corresponding position. The linkage cross bar 36 can generate a force acting on the backrest support 2 by pressing the groove wall of the inclined linkage chute 352. The design is simple and the structure is ingenious.

[0057] Furthermore, the spiral cooperation between the slider 34 and the spiral rod can make the back support 2 stay and remain in the corresponding position. Specifically, when the back support 2 is subjected to the backward leaning force, the linkage cross bar 36 will act on the groove wall of the linkage slide groove 352, so that the sliding seat 35 has a movement tendency to move up and down. However, since the spiral cooperation between the slider 34 and the spiral rod is self-locking, even if the slider 34 is subjected to the reverse force of the sliding seat 35, the slider 34 will not move horizontally to the left and right, thereby ensuring that the back support 2 adjusted into place can stably support the back.

[0058] Furthermore, in order to prevent the sliding seat 35 from being exposed, the connecting portion 21 is a cover shell having an avoidance cavity 22 with an opening at the rear end. The width of the avoidance cavity 22 matches the width of the mounting seat 1. The mounting seat 1 is provided with a waist-shaped avoidance groove 14 for avoiding the linkage cross bar 36. When the backrest support 2 rotates forward and backward along the hinge end A, the avoidance cavity 22 avoids the mounting seat 1, and the linkage cross bar 36 moves in the waist-shaped avoidance groove 14, and ensures that the sliding seat 35 is never exposed.

[0059] Example 2: Figure 8 As shown, the difference between this embodiment and the above embodiment is that the adjustment component arranged between the connecting part 21 and the back bracket 1a is a telescopic rod 4, and the telescopic rod 4 includes a fixed column 41 and a movable column 42 which are sleeved with each other, and the fixed column 41 and the movable column 42 are respectively connected to the mounting seat 1 and the connecting part 21; a control mechanism is arranged between the fixed column 41 and the movable column 42, and the control mechanism includes a plurality of gear holes 43 arranged along the length direction of the fixed column 41, and a receiving groove 44 is arranged on the column body of the movable column 42, and an elastically retractable limiting ball 45 is arranged in the receiving groove 44, and the movable column is driven by an external force. 42 is retracted and expanded, and a compression spring 46 acting on the limiting ball 45 is provided in the accommodating groove 45. The limiting ball 45 can switch between the corresponding gear holes 43 while elastically expanding and contracting, so that the backrest support 2 can rotate forward and backward along the hinge end A and stay in the corresponding position; the adjustment process of the backrest support 2 is simplified to the process of extending and contracting the telescopic rod 4 forward and backward. The design is simple and exquisite. When adjusting, press the limiting ball 45 to make it disengage from the corresponding gear hole 43, and then pull the movable column 42 until the limiting ball 45 is stuck in the next corresponding gear hole 43, so as to achieve the adjustment effect in the above embodiment.

[0060] Furthermore, in this embodiment, the movable column 42 is hinged to the connecting portion 21; or the fixed column 41 is hinged to the mounting seat 1; the hinged design can prevent the telescopic rod 4 from getting stuck during extension and retraction, making the backrest support 2 smoother when adjusted forward and backward.

[0061] Furthermore, to ensure the adjustment effect, in this embodiment, there are a plurality of the telescopic rods 4 arranged at intervals along the longitudinal direction between the mounting base 1 and the connecting portion 21; the plurality of telescopic rods 4 can provide sufficient telescopic adjustment force when the backrest support 2 is adjusted back and forth, and can also form a stable support for the backrest support 2 when the backrest support 4 is adjusted to the corresponding position.

[0062] The above has schematically described the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention. The actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A backrest adjustment mechanism, characterized in that, Comprising: A backrest support (1a); the backrest support (1a) is a support member of the backrest adjustment mechanism; A backrest support member (2); disposed on the front side of the backrest support (1a); the backrest support member (2) is hinged to the backrest support frame and forms a hinge end (A), enabling the backrest support member (2) to rotate forward and backward relative to the backrest support (1a); An adjustment assembly; disposed between the backrest support member (2) and the backrest support (1a), and the adjustment assembly is offset from the hinge end (A) in the height direction; the adjustment assembly can act on the backrest support member (2) to cause the backrest support member (2) to rotate forward and backward along the hinge end (A) and stay at a corresponding position.

2. The backrest adjustment mechanism according to claim 1, characterized in that: The backrest support member (2) includes a backrest main body (23) and a connecting portion (21) connected to the rear end of the backrest main body (23), the backrest support (1a) includes a support frame main body and a mounting seat (1) connected to the front end of the support frame main body, and the adjustment assembly is located between the connecting portion (21) and the mounting seat (1); the adjustment assembly includes a sliding seat (35) that can slide longitudinally on the mounting seat (1), a driving assembly (3) is connected to the sliding seat (35), and the driving assembly (3) can drive the sliding seat (35) to slide up and down; a linkage mechanism is provided between the sliding seat (35) and the connecting portion (21), and the linkage mechanism can respond to the force of the sliding seat (35) sliding up and down and link the backrest support member (2) to rotate forward and backward and stay at a corresponding position.

3. The backrest adjusting mechanism according to claim 2, characterized in that: The driving assembly (3) includes a slider (34) that can slide left and right, and a driving member for driving the slider (34) to slide left and right is connected to the slider (34); a transmission structure is provided between the slider (34) and the sliding seat (35); the transmission structure can drive the driving member to drive the slider (34) to slide left and right and drive the sliding seat (35) to slide longitudinally on the mounting seat (1).

4. The backrest adjusting mechanism according to claim 3, characterized in that: The transmission structure is a chute and slide bar structure; the chute is an inclined guide groove (351) opened on the sliding seat (35), and the inclined guide groove (351) extends obliquely in the longitudinal direction; the slide bar is a plug post (341) provided on the slider (34), and the plug post (341) is slidably connected in the inclined guide groove (351); when the slider (34) slides left and right, it can drive the plug post (341) to slide in the inclined guide groove (351), thereby causing the sliding seat (35) to slide up and down.

5. The backrest adjustment mechanism according to claim 4, characterized in that: A transmission screw hole (342) is opened on the slider (34), and the axis direction of the transmission screw hole (342) is the same as the sliding direction of the slider (34); the driving member is a screw post that is helically engaged in the transmission screw hole (342), and one end of the screw post away from the slider (34) is connected with a handle (32), and the handle (32) drives the screw post to rotate in place under the action of an external force, thereby driving the slider (34) to slide in the left and right directions.

6. The backrest adjusting mechanism according to claim 5, characterized in that: The screw post includes an outer screw sleeve (33) that is helically engaged in the transmission screw hole (342) and a transmission plug rod (31), and the handle (32) is connected to the outer end of the transmission plug rod (31); the outer screw sleeve (33) includes a transmission slot (331) inside itself, and the transmission plug rod (31) passes through the transmission slot (331) to drive the outer screw sleeve (33) to rotate circumferentially.

7. The backrest adjustment mechanism according to claim 6, characterized in that: The cross-sectional shape of the transmission slot (331) is polygonal, cross-shaped or gear-shaped, and the cross-sectional shape of the transmission plug (31) matches the cross-sectional shape of the transmission slot (331).

8. The backrest adjusting mechanism according to claim 3, characterized in that: The inclination angle of the inclined guide groove (351) with respect to the vertical axis is 45°.

9. The backrest adjusting mechanism according to claim 3, characterized in that: The mounting seat (1) is provided with a sliding guide groove (11) extending longitudinally, and the sliding seat (35) slides longitudinally within the sliding guide groove (11); the slider (34) is within the sliding guide groove (11) and slides between the left and right side walls within the sliding guide groove (11).

10. A backrest adjustment mechanism according to claim 9, characterized in that: The slider (34) is provided with ribs (343) extending left and right, and the corresponding wall surface of the sliding guide groove (11) is provided with grooves (13), and the ribs (343) cooperate with the grooves (13) to form a sliding guide for the slider (34).

11. The backrest adjustment mechanism according to claim 2, characterized in that: The linkage mechanism includes a linkage cross bar (36) and a linkage chute (352). The linkage cross bar (36) is transversely disposed between the sliding seat (35) and the connecting portion (21). The linkage chute (352) is provided on the sliding seat (35) or the connecting portion (21). The linkage chute (352) extends obliquely longitudinally. The linkage cross bar (36) is slidably connected within the linkage chute (352); when the sliding seat (35) slides longitudinally, the linkage rod can slide within the linkage chute (352) and drive the backrest support (2) to rotate forward and backward and stay at the corresponding position.

12. The backrest adjusting mechanism according to claim 2, characterized in that: The connecting portion (21) is a housing, and the housing has an avoidance cavity (22) with an open rear end. When the backrest support (2) rotates forward and backward along the hinge end (A), the avoidance cavity (22) avoids the mounting seat (1) and ensures that the sliding seat (35) is never exposed.

13. A backrest adjusting mechanism according to claim 1, characterized in that: The backrest support (2) includes a backrest main body (23) and a connecting portion (21) connected to the rear end of the backrest main body (23). The adjustment assembly is disposed between the connecting portion (21) and the backrest bracket (1a); the adjustment assembly is a telescopic rod (4). The telescopic rod (4) includes a fixed column (41) and a movable column (42) sleeved with each other. The fixed column (41) and the movable column (42) are respectively connected to the mounting seat (1) and the connecting portion (21); a control mechanism is provided between the fixed column (41) and the movable column (42). The control mechanism includes a plurality of gear holes (43) arranged along the length direction of the fixed column (41). A receiving groove (44) is provided on the column body of the movable column (42). An elastically telescopic limiting sphere (45) is provided within the receiving groove (44). Driven by an external force to drive the movable column (42) to expand and contract, the limiting sphere (45) can switch between the corresponding gear holes (43) while elastically expanding and contracting, thereby enabling the backrest support (2) to rotate forward and backward along the hinge end (A) and stay at the corresponding position.

14. A backrest adjusting mechanism according to claim 13, characterized in that: The movable column (42) is hinged to the connecting portion (21); alternatively, the fixed column (41) is hinged to the mounting seat (1).

15. A backrest adjustment mechanism according to claim 13, characterized in that: There are a plurality of the telescopic rods (4) arranged at intervals longitudinally between the mounting seat (1) and the connecting portion (21).

16. A seat, characterized in that: It includes the backrest adjustment mechanism described in claim 1.

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