Sliding adjusting device and seat
By simplifying the structure of the sliding adjustment device by simplifying the elastic action of the elastic adjustment rod itself, the complex problems of existing devices installation and maintenance are solved, and more efficient installation and convenient maintenance are achieved.
Patent Information
- Application Number
- CN202421053887.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The existing sliding adjustment device is complex during installation and maintenance, which increases installation time and cost, and is more troublesome to replace and maintain later.
The sliding adjustment of the first base on the second base is achieved through the elastic action of the elastic adjustment rod itself, eliminating the addition of reset parts on both sides of the elastic adjustment rod, and simplifying the structure and installation steps.
The structure and installation process of the sliding adjustment device are simplified, the cost is reduced, and the later maintenance and replacement are more convenient.
Smart Images
Figure CN222548889U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of furniture, in particular to a sliding adjustment device and a seat. Background Art
[0002] Sliding devices are widely used in daily furniture. For example, the support components in some ergonomic chairs are adjustable in height on the back support through sliding adjustment devices. These support components can be headrests, backrest components, lumbar support components, etc. By adjusting the height of the support components through the sliding adjustment device, the chair can adapt to occupants of different body shapes when in use.
[0003] For example, in the lifting device patent with announcement number CN218474353, the lifting and lowering adjustment of the chair back is controlled by sliding an adjusting rod between a plurality of longitudinally distributed oblique tooth grooves; when the chair back rises and stays at a predetermined position, the adjusting rod can swing left and right and switch in the oblique tooth groove to achieve adjustable support height of the chair back; however, the above design has some problems.
[0004] The adjusting rod matched with the bevel tooth groove has one end rotatably connected to the sliding seat and the other end stuck in the bevel tooth groove. In order to make the adjusting rod return to the center after swinging, elastic rods are arranged on the left and right sides to give the adjusting rod a return force. Although the purpose of returning the adjusting rod is achieved, more parts to be installed are added to the lifting device, making the structure of the entire lifting device more complicated; therefore, the time and corresponding cost spent on the installation of the lifting device increase, and the later replacement and maintenance of the lifting device are more troublesome.
[0005] Based on the above problems, a sliding adjustment device with a simple structure, few parts, and convenient installation and maintenance is needed. Summary of the invention
[0006] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a sliding adjustment device, which realizes the sliding adjustment of the first base on the second base by swinging through the elastic action of the elastic adjustment rod itself; it eliminates the need to add reset parts on both sides of the elastic adjustment rod, simplifies the structure and installation steps, reduces costs, and makes the later maintenance and replacement of the sliding adjustment device more convenient.
[0007] Furthermore, a seat is provided, on which the sliding adjustment device is arranged, so that the position of corresponding components on the seat can be quickly adjusted, thereby enriching the functions of the seat.
[0008] The technical solution of the utility model is achieved in this way:
[0009] A sliding adjustment device, comprising:
[0010] a first base configured as a sliding support member of the sliding adjustment device;
[0011] The second base is slidably connected to the first base; the second base is provided with a guide portion, the guide portion is provided with a plurality of lower oblique teeth evenly distributed along the sliding direction, and a positioning tooth groove is formed between every two adjacent lower oblique teeth;
[0012] The elastic adjustment rod comprises a fixed end and a swing end opposite to the fixed end, wherein the fixed end is fixed on the first base and a clamp is provided on the swing end; the clamp can swing left and right under the elastic action of the elastic adjustment rod itself and always has a tendency to return to the normal position after swinging;
[0013] When the second base slides relative to the first base, the clamping head on the swinging end can be squeezed by the lower oblique tooth body and swing in one direction of the left and right directions; and after the swing, the clamping head returns to the center under the elastic action of the elastic adjustment rod itself and is clamped into the corresponding positioning tooth groove, so that the second base stays in the corresponding position after sliding.
[0014] Preferably, a swing limit groove is provided on the first base, and the rod body of the elastic adjustment rod close to the clamping head position swings or returns to the left and right direction in the swing limit groove; to prevent the clamping head from swinging too much and causing excessive deformation of the elastic adjustment rod.
[0015] Preferably, a strip groove connected to the swing limit groove is provided on the first base, and the rod body of the elastic adjustment rod close to the fixed end is stuck in the strip groove to prevent the rod body of the elastic adjustment rod from moving left and right when the clamp head swings or returns.
[0016] Preferably, the elastic adjustment rod is made of elastic metal or plastic; the elastic metal or plastic has good structural strength and long service life.
[0017] Preferably, the clamping head at the swing end position is formed by bending the elastic adjusting rod in one piece; the processing technology of the clamping head formed by bending in one piece is simple, and the connection strength with the elastic adjusting rod body is high.
[0018] Preferably, a column is provided at the position of the fixed end of the elastic adjusting rod corresponding to the first base, and the fixed end of the elastic adjusting rod is an annular hook, which is sleeved on the column; the design of the annular hook is simple and practical, and can effectively prevent the elastic adjusting rod from moving along the sliding direction of the second base.
[0019] Preferably, a pressure cover is further included, which is connected to the first base along the front-to-back direction to prevent the elastic adjustment rod from being separated from the first base front-to-back.
[0020] Preferably, the positioning tooth groove is open on the left or right side; the guide part also includes a sliding groove near the opening position of the positioning tooth groove, and a reset groove connected to the sliding groove is provided on the opposite side of the sliding groove; the sliding groove has a starting end and an ending end; when the second base slides relative to the first base, the chuck swings along the starting end and then enters the sliding groove, and switches positions between multiple positioning tooth grooves until the chuck moves to the ending end; when the second base slides reversely relative to the first base, the chuck swings reversely at the ending end and enters the reset groove, and the chuck has a tendency to return to the starting end again under the elastic action of the elastic adjustment rod itself; the design of the sliding groove and the reset groove is simple and ingenious, and there is no need to set a control switch to make the chuck slide in a circular manner in the guide part, so that the first base can be quickly slid relative to the first base for positioning or reverse reset.
[0021] Preferably, it also includes an anti-shift jump structure, which includes a plurality of upper inclined teeth evenly distributed along the sliding direction, each upper inclined tooth body crossing the sliding groove and interlacing with the positioning tooth grooves, so that a plurality of connected V-shaped gear grooves are formed between the plurality of lower inclined tooth bodies and the plurality of upper inclined tooth bodies, the V-shaped gear groove including a first limit point at the root of the upper inclined tooth body and a second limit point at the root of the lower inclined tooth body; when the second base slides relative to the first base under the action of external force, the chuck swings and moves along the V-shaped gear groove to the first limit point, at which time the second base is made to slide in the opposite direction, the chuck returns to the positive direction and moves along the V-shaped groove to the second limit point; the chuck switches between the plurality of V-shaped gear grooves, so that the first base stays at the corresponding position after sliding relative to the second base; the anti-shift jump structure can make the chuck snap into the positioning tooth grooves one by one, avoiding the shift jump phenomenon when the chuck slides over a plurality of positioning tooth grooves at one time, so that the position of the second base can be adjusted step by step during sliding.
[0022] Furthermore, a seat is provided, comprising the sliding adjustment device.
[0023] Preferably, the seat includes a back support and a backrest assembly at the front end of the back support, the first base is a component of the backrest assembly, and the second base is a component of the back support; the backrest assembly can slide longitudinally on the back support and stay in a corresponding position through a sliding adjustment device, so that the support height of the backrest assembly on the back support can be adjusted.
[0024] Preferably, the seat includes a backrest main body and a lumbar support at the front and lower part of the backrest main body, the first base is a component of the lumbar support, and the second base is a component of the backrest main body; the lumbar support can slide longitudinally on the backrest main body through a sliding adjustment device and stay in a corresponding position; the lumbar support can be adjusted in support height on the backrest main body.
[0025] Preferably, the seat includes a backrest main body and a headrest at the upper end of the backrest main body, the first base is a component of the headrest, and the second base is a component of the backrest main body; the headrest can slide longitudinally on the upper end of the backrest main body and stay in the corresponding position through a sliding adjustment device, so that the headrest can achieve adjustable support height on the backrest main body.
[0026] The principle of the utility model using the above technical solution is:
[0027] The utility model aims to provide a sliding adjustment device, which realizes the sliding adjustment of a first base on a second base by swinging through the elastic effect of the elastic adjustment rod itself.
[0028] Furthermore, a seat is provided, on which the sliding adjustment device is arranged, so that the position of corresponding components on the seat can be quickly adjusted.
[0029] The beneficial effects of the utility model using the above technical solution are:
[0030] 1. When the clamping head on the elastic adjustment rod swings or returns to the center, it only relies on the elastic effect of the elastic adjustment rod itself, and there is no need to set reset parts on both sides of the rod body, so that the structure of the sliding adjustment device is further simplified and the cost is further reduced; when installing or replacing, it is only necessary to disassemble or replace the entire elastic adjustment rod, which saves the time of disassembling or replacing the reset parts and improves the disassembly and assembly efficiency of the entire sliding adjustment device.
[0031] 2. The sliding adjustment device is arranged on the seat, so that the parts on the seat that need sliding adjustment can be quickly adjusted in position; for example, the sliding adjustment device is arranged between the seat back body and the lumbar support at the front lower end of the seat back body, so that the support position of the lumbar support can be quickly adjusted, thereby further enriching the functions of the seat. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is a structural schematic diagram of the sliding adjustment device;
[0033] Figure 2 An exploded view of the sliding adjustment device;
[0034] Figure 3 It is an exploded view of the gland, the second base, and the elastic adjustment rod;
[0035] Figure 4 It is a schematic diagram of the structure in which the upper inclined teeth are not provided on the guide part;
[0036] Figure 5 is a schematic diagram of the guide portion and the anti-shift structure on the first base;
[0037] Figure 6 It is a structural schematic diagram of the chuck sliding back to the starting end;
[0038] Figure 7 A schematic diagram of a chuck sliding between multiple gear slots;
[0039] Figure 8 It is a structural schematic diagram of the clamp head sliding to the termination end;
[0040] Fig. 9 It is a schematic diagram of the chuck swinging in the reverse direction to slide in the reset groove.
[0041] Fig.10 An enlarged view of the sliding adjustment device disposed between the back support and the lumbar support;
[0042] Fig.11 An enlarged view of a slide adjustment device disposed between a back support and a backrest assembly;
[0043] The figures are marked as follows: 1-second base, 2-first base, 3-elastic adjustment rod, 4-pressure cover, 5-limiting buffer, 6-back bracket, 7-lumbar support, 8-backrest assembly, 11-sliding groove, 12-reset groove, 13-lower oblique tooth body, 14-upper oblique tooth body, 15-guide rail, 16-sliding adjustment groove, 17-positioning tooth groove, 21-column, 22-swinging limiting groove, 23-avoidance cavity, 24-bar groove, 25-limiting end, 31-clamp, 32-fixed end, 51-limiting groove, 111-first limiting point, 112-second limiting point, 113-V-shaped gear groove, 114-starting end, 115-ending end. DETAILED DESCRIPTION
[0044] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0045] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.
[0047] The specific implementation of the utility model is as follows:
[0048] like Figure 1-11 As shown, this embodiment provides a sliding adjustment device, including:
[0049] A first base 2 configured as a sliding support member of the sliding adjustment device;
[0050] The second base 1 is slidably connected to the first base 2; the second base 1 is provided with a guide portion, and the guide portion is provided with a plurality of lower oblique teeth 13 evenly distributed along the sliding direction, and a positioning tooth groove 17 is formed between every two adjacent lower oblique teeth 13; the sliding direction can be longitudinal or transverse;
[0051] The elastic adjustment rod 3 is made of elastic metal or plastic; the elastic metal or plastic has good structural strength and long service life; the elastic adjustment rod 3 includes a fixed end 32 and a swing end opposite to the fixed end 32, the fixed end 32 is fixed on the first base 2, and a clamp 31 is provided on the swing end; the clamp 31 can swing left and right under the elastic action of the elastic adjustment rod 3 itself, and always has a tendency to return to the normal position after swinging;
[0052] When the second base 1 slides relative to the first base 2, the clamping head 31 on the swinging end can be squeezed by the lower oblique tooth body 13 and swing in one direction of the left and right directions; and after the swing, the clamping head 31 returns to the center under the elastic action of the elastic adjustment rod 3 itself and is clamped into the corresponding positioning tooth groove 17, so that the second base 1 stays in the corresponding position after sliding.
[0053] Further, if Figure 1-3 As shown, a swing limit groove 22 is provided on the first base 2, and the rod body of the elastic adjustment rod 3 close to the clamping head 31 swings or returns to the left and right direction in the swing limit groove 22; to prevent the clamping head 31 from swinging too much and causing excessive deformation of the elastic adjustment rod 3.
[0054] Furthermore, the elastic adjustment rod 3 is arranged on the opposite side of the end face of the first base 2 facing the second base 1, and the first base 2 is provided with an avoidance cavity 23 corresponding to the position of the clamping head 31. The clamping head 31 passes through the avoidance cavity 23 to act on the second base 1 and swings or returns to the center in the avoidance cavity 23.
[0055] Furthermore, a strip groove 24 connected to the swing limit groove 22 is provided on the first base 2, and the rod body of the elastic adjustment rod 3 close to the fixed end 32 is stuck in the strip groove 24 to prevent the rod body of the elastic adjustment rod 3 from moving left and right when the clamping head 31 swings or returns.
[0056] Furthermore, the clamping head 31 at the swing end position is formed by bending the elastic adjusting rod 3 in one piece; the processing technology of the clamping head 31 formed by bending in one piece is simple, and the connection strength with the rod body of the elastic adjusting rod 3 is high.
[0057] Furthermore, a column 21 is provided at a position of the first base 2 corresponding to the fixed end 32 of the elastic adjusting rod 3, and the fixed end 32 of the elastic adjusting rod 3 is an annular hook, which is sleeved on the column 21; the design of the annular hook is simple and practical, and can effectively prevent the elastic adjusting rod 3 from moving along the sliding direction of the second base 1.
[0058] Furthermore, the sliding adjustment device also includes a pressure cover 4, which is connected to the first base 2 along the front-to-back direction to prevent the elastic adjustment rod 3 from being separated from the first base 2 front-to-back.
[0059] Further, if Figure 4 As shown, the clamping head 31 can realize cyclic movement on the guide part. Specifically, the positioning tooth groove 17 is open on the left or right side; the guide part also includes a sliding groove 11 near the opening position of the positioning tooth groove 17, and a reset groove 12 connected to the sliding groove 11 is provided on the opposite side of the sliding groove 11; the sliding groove 11 has a starting end 114 and an end end 115; when the second base 1 slides relative to the first base 2, the clamping head 31 swings along the starting end 114 and enters the sliding groove 11, and is positioned between the plurality of positioning tooth grooves 17. Switch until the clamp head 31 moves the terminal end 115; when the second base 1 slides in the opposite direction relative to the first base 2, the clamp head 31 swings in the opposite direction at the terminal end 115 and enters the reset groove 12, and the clamp head 31 has a tendency to return to the starting end 114 again under the elastic action of the elastic adjustment rod 3 itself; the design of the sliding groove 11 and the reset groove 12 is simple and ingenious, and there is no need to set a control switch, so that the clamp head 31 can slide in a circle in the guide part, so that the first base 2 can be quickly slid and positioned or reversely reset relative to the second base 2.
[0060] Further, if Figure 1-3 As shown, the second base 1 is provided with a guide rail 15 extending along the sliding direction, and the second base 1 is slidably connected to the first base 2 through the guide rail 15; and the second base 1 is provided with a limit buffer 5, and the first base 2 is provided with an arc-shaped limit end 25 at one end facing the limit buffer 5, and the limit buffer 5 is provided with a limit groove 51 matching the limit end 25. When the clamping head 31 slides to the terminal end 115 of the sliding groove 11, the limit end 25 cooperates with the limit groove 51 to form a buffer limit for the second base 1, and share the limiting force on the clamping head 31 being clamped into the terminal end 115.
[0061] Furthermore, when the external force applied when the second base 1 slides is too large, multiple positioning tooth grooves 17 will be crossed at one time. If too many positioning tooth grooves 17 are crossed, if the clamping head 31 is to be clamped into the previous positioning tooth groove 17, it is necessary to allow the clamping head 31 to be readjusted from the first positioning tooth groove 17 through the reset groove 12. This operation effect will affect the adjustment efficiency; therefore, the sliding adjustment device also includes an anti-jump gear structure, such as Figure 5As shown, the anti-shifting structure includes a plurality of upper oblique tooth bodies 14 uniformly distributed along the sliding direction, each upper oblique tooth body 14 crosses the sliding groove 11 and intersects with the positioning tooth groove 17, so that a plurality of lower oblique tooth bodies 13 and a plurality of upper oblique tooth bodies 14 form a plurality of connected V-shaped gear grooves 113, and the V-shaped gear grooves 113 include a first limiting point 111 at the root of the upper oblique tooth body 14 and a second limiting point 112 at the root of the lower oblique tooth body 13; Figure 6-9 As shown, when the second base 1 slides relative to the first base 2 under the action of external force, the clamping head 31 swings and moves along the V-shaped gear groove 113 to the first limit point 111, at which time the second base 1 slides in the opposite direction, and the clamping head 31 returns to the opposite direction and moves along the V-shaped groove to the second limit point 112; the clamping head 31 switches between multiple V-shaped gear grooves 113, so that the first base 2 stays at the corresponding position after sliding relative to the second base 1; the anti-jumping structure can make the clamping head 31 clamped into the positioning tooth groove 17 one by one, avoiding the jumping phenomenon of the clamping head 31 sliding across multiple positioning tooth grooves 17 at one time, so that the second base 1 can be adjusted in position step by step when sliding.
[0062] A seat is provided, comprising the sliding adjustment device, which is mainly used to adjust the support height of the support component on the seat, so that the seat has more functions. For example, the sliding adjustment device can be used to adjust the support height of the backrest component 9; specifically, Fig.11 As shown, the seat includes a back support 8 and a backrest assembly 9 at the front end of the back support 8, the second base 2 is a component of the backrest assembly 9, and the second base 1 is a component of the back support 8; the backrest assembly 9 can slide longitudinally on the back support 8 and stay at a corresponding position through a sliding adjustment device, so that the backrest assembly 9 on the back support 8 can achieve adjustable support height.
[0063] Furthermore, the sliding adjustment device can also be used to adjust the support height of the waist support 7. Specifically, Fig.10 As shown, the seat includes a backrest body 6 and a lumbar support 7 at the front and lower part of the backrest body 6, the second base 2 is a component of the lumbar support 7, and the second base 1 is a component of the backrest body 6; the lumbar support 7 can slide longitudinally on the backrest body 6 through a sliding adjustment device and stay at a corresponding position, so that the lumbar support 7 on the backrest body 6 can achieve adjustable support height.
[0064] Furthermore, the sliding adjustment device can also be used to adjust the support height of the lumbar support 7. Specifically, the seat includes a backrest body 6 and a headrest (not shown) at the upper end of the backrest body 6. The second base 2 is a component of the headrest, and the second base 1 is a component of the backrest body 6. The headrest can slide longitudinally on the upper end of the backrest body 6 and stay in a corresponding position through the sliding adjustment device, so that the support height of the headrest on the backrest body 6 can be adjusted, wherein the second base 1 is provided with a sliding adjustment groove 16 extending forward and backward, and the rear end of the headrest is slidably connected in the sliding adjustment groove 16, so that the position of the headrest can also be adjusted in the front and rear directions.
[0065] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.
Claims
1. A sliding adjustment device, characterized by: A first base (2) configured as a sliding support member of a sliding adjustment device; A second base (1) slidably connected to the first base (2); The second base (1) is provided with a guide portion, the guide portion is provided with a plurality of lower oblique tooth bodies (13) evenly distributed along the sliding direction, and a positioning tooth groove (17) is formed between every two adjacent lower oblique tooth bodies (13); The elastic adjustment rod (3) comprises a fixed end (32) and a swing end opposite to the fixed end (32); the fixed end (32) is fixed to the first base (2); and a clamp (31) is provided on the swing end; the clamp (31) can swing left and right under the elastic action of the elastic adjustment rod (3) itself, and always has a tendency to return to the original position after swinging; When the second base (1) slides relative to the first base (2), the clamping head (31) on the swinging end can be pressed against the lower oblique tooth body (13) and swing in one of the left and right directions; and after the swing, the clamping head (31) returns to the correct position under the elastic action of the elastic adjustment rod (3) itself and is clamped into the corresponding positioning tooth groove (17), so that the second base (1) stays at the corresponding position after sliding.
2. The sliding adjustment device according to claim 1, characterized in that: The first base (2) is provided with a swing limit groove (22), and the rod body on the elastic adjustment rod (3) close to the clamping head (31) swings or returns to the center in the swing limit groove (22).
3. The sliding adjustment device according to claim 2, characterized in that: The first base (2) is provided with a strip groove (24) which is in communication with the swing limit groove (22), and the rod body of the elastic adjustment rod (3) close to the fixed end (32) is clamped in the strip groove (24).
4. The sliding adjustment device according to claim 1, characterized in that: The elastic adjustment rod (3) is made of elastic metal or plastic.
5. The sliding adjustment device according to claim 1, characterized in that: The clamping head (31) at the swing end position is formed by bending the elastic adjustment rod (3) in one piece.
6. The sliding adjustment device according to claim 1, characterized in that: A column (21) is provided on the first base (2) at a position corresponding to the fixed end (32) of the elastic adjustment rod (3); the fixed end (32) of the elastic adjustment rod (3) is an annular hook, and the annular hook is sleeved on the column (21).
7. The sliding adjustment device according to claim 1, characterized in that: It also comprises a pressure cover (4), which is connected to the first base (2) along the front-to-back direction to prevent the elastic adjustment rod (3) from being separated from the first base (2) in the front-to-back direction.
8. The sliding adjustment device according to claim 1, characterized in that: The positioning tooth groove (17) is open on the left or right side; the guide portion further comprises a sliding groove (11) near the opening position of the positioning tooth groove (17), and a reset groove (12) connected to the sliding groove (11) is provided on the opposite side of the sliding groove (11); the sliding groove (11) has a starting end (114) and a terminal end (115); when the second base (1) slides relative to the first base (2), the clamping head (31) swings along the starting end (114) and enters the sliding groove (11), and switches positions between the plurality of positioning tooth grooves (17) until the clamping head (31) moves to the terminal end (115); when the second base (1) slides relative to the first base (2), the clamping head (31) swings in the opposite direction at the terminal end (115) and enters the reset groove (12), and the clamping head (31) has a tendency to return to the starting end (114) again under the elastic action of the elastic adjustment rod (3) itself.
9. The sliding adjustment device according to claim 8, characterized in that: The anti-shifting structure also includes a plurality of upper inclined tooth bodies (14) uniformly distributed along the sliding direction, each upper inclined tooth body (14) crosses the sliding groove (11) and intersects with the positioning tooth groove (17), so that a plurality of connected V-shaped gear grooves (113) are formed between the plurality of lower inclined tooth bodies (13) and the plurality of upper inclined tooth bodies (14), and the V-shaped gear grooves (113) include a first limiting point (111) at the root of the upper inclined tooth body (14), a second limiting point (111) at the root of the lower inclined tooth body (13), and a second limiting point (112) at the root of the lower inclined tooth body (13). When the second base (1) slides relative to the first base (2) under the action of an external force, the clamping head (31) swings and moves along the V-shaped gear groove (113) to the first limit point (111), at which time the second base (1) slides in the reverse direction, and the clamping head (31) returns to the positive direction and moves along the V-shaped groove to the second limit point (112); the clamping head (31) switches between the plurality of V-shaped gear grooves (113), so that the first base (2) slides relative to the second base (1) and stays at the corresponding position.
10. A seat, characterized in that: The invention comprises the sliding adjustment device according to any one of claims 1 to 9.
11. The seat according to claim 10, characterized in that: The seat comprises a back support (8) and a backrest assembly (9) at the front end of the back support (8); the first base (2) is a component of the backrest assembly (9); and the second base (1) is a component of the back support (8); the backrest assembly (9) can slide longitudinally on the back support (8) and stay at a corresponding position via a sliding adjustment device.
12. The seat according to claim 10, characterized in that: The seat comprises a seat back body (6) and a lumbar support (7) at the front lower part of the seat back body (6); the first base (2) is a component of the lumbar support (7), and the second base (1) is a component of the seat back body (6); the lumbar support (7) can slide longitudinally on the seat back body (6) through a sliding adjustment device and stay at a corresponding position.
13. The seat according to claim 10, characterized in that: The seat comprises a seat back body (6) and a headrest at the upper end of the seat back body (6); the first base (2) is a component of the headrest, and the second base (1) is a component of the seat back body (6); the headrest can slide longitudinally on the upper end of the seat back body (6) through a sliding adjustment device and stay at a corresponding position.