Movable waist rest adjusting mechanism and seat

Abstract

The utility model provides a movable waist rest adjusting mechanism and a seat. The movable waist rest adjusting mechanism comprises a mounting seat, a waist rest supporting piece and a first adjusting assembly, and a first connecting part is arranged on the mounting seat; the waist rest supporting piece is connected with a matching part; the matching part is slidably connected to the first connecting part in the length direction of the first connecting part; the first adjusting assembly is arranged between the first connecting part and the matching part and comprises a sliding part and a control part in spiral fit with the sliding part, and a linkage structure is arranged between the sliding part and the matching part; the control piece drives the sliding piece to move in the width direction of the first connecting part in a spiral fit mode, the sliding piece drives the waist rest supporting piece to move in the length direction of the first connecting part through the linkage structure, and the waist rest supporting piece can be adjusted to any position in the length direction of the mounting base. The movable waist rest adjusting mechanism is arranged on a seat, so that noise generated when the position of the waist rest supporting piece is adjusted can be reduced, and stepless adjustment of the supporting position of the waist rest supporting piece is achieved.

Description

Technical Field

[0001] The utility model relates to the field of seats, in particular to a movable lumbar support adjusting mechanism and a seat. Background Art

[0002] Most office chairs on the market are equipped with a lumbar support that can support the waist at the backrest. The lumbar support is arranged at the lower end of the chair back and protrudes forward to support the natural curvature of the waist, ensuring the lumbar health of office workers. In order to enrich the functions of the seat, most office chairs are designed with an adjustable lumbar support, which can slide back and forth to support sitters with different postures.

[0003] For example, in the seat lumbar support patent with the publication number CN214631136, a stepped adjustment mechanism is used to adjust the position of the lumbar support. The adjustment mechanism that can drive the backrest plate to move back and forth includes a locking member. The locking member has a plurality of stop portions in the front-back direction, and a limiting portion that cooperates with the stop portions is provided on the support body connected to the backrest plate. By the cooperation of the corresponding stop portions and the limiting portion, the position locking and adjustment of the backrest plate are realized. However, this adjustment mechanism has deficiencies.

[0004] The cooperation structure of multiple corresponding stop portions and limiting portions is actually a stepped adjustment mechanism relying on tooth engagement. This stepped adjustment structure is relatively cumbersome to operate and generates noise.

[0005] There is still a distance between multiple stop portions or limiting portions. Therefore, the number of locking points is small, and stepless adjustment of the backrest plate cannot be achieved. Summary of the Invention

[0006] In order to solve the above technical problems, the purpose of the utility model is to provide a movable lumbar support adjusting mechanism. By means of a spiral fit, a sliding member is driven to move along the width direction of the first connecting portion, and the sliding member drives a lumbar support member to move along the length direction of the first connecting portion through a linkage structure, so that the lumbar support member can be adjusted to any position in the length direction of the mounting seat.

[0007] Furthermore, a seat is provided. By arranging the movable lumbar support adjusting mechanism on the seat, the noise during the position adjustment of the lumbar support member can be reduced, and stepless adjustment of the support position of the lumbar support member can be realized.

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

[0009] A movable lumbar support adjusting mechanism includes:

[0010] A mounting seat, on which a first connecting portion is provided;

[0011] The lumbar support member is connected with a matching part; along the length direction of the first connecting part, the matching part is slidably connected to the first connecting part;

[0012] The first adjusting component is arranged between the first connecting part and the matching part, and includes a sliding part and a control part that is in screw fit with the sliding part. The control part can rotate in place along its own axis and drive the sliding part to slide along the width direction of the first connecting part and then stay at the corresponding position; a linkage structure is arranged between the sliding part and the matching part, and the linkage structure can drive the matching part to slide along the length direction of the first connecting part;

[0013] The control part can rotate in place along its own axis, so that the sliding part drives the lumbar support member to slide along the length direction of the first connecting part through the linkage structure and stay at the corresponding position.

[0014] Preferably, the control part includes a screw column passing through the first connecting part, and a screw hole extending along the width direction of the sliding part is arranged on the sliding part. The screw column is in fit with the screw hole, and the outer end of the screw column is connected with a handle exposed on the mounting seat; by rotating the handle, the screw column can rotate in place along its own axis, drive the sliding part to the corresponding position, and due to the self-locking property after the screw column is in fit with the screw hole, the sliding part can stay at the corresponding position.

[0015] Preferably, the screw column includes an outer screw tube that is in screw fit in the screw hole, a transmission rod is arranged inside the outer screw tube, and the handle is connected to the outer end of the transmission rod; the outer screw tube includes a transmission hole inside itself, and the transmission rod is arranged in the transmission hole to drive the outer screw tube to rotate in place; the split structure design of the screw column enables the transmission rod to be connected to the outer screw tube in a plug-in manner, which is convenient for the installation of the first adjusting component.

[0016] Preferably, the cross-sectional shape of the transmission hole is polygonal or cross-shaped, and the cross-sectional shape of the transmission rod matches the cross-sectional shape of the transmission hole.

[0017] Preferably, a first guide groove extending along the length direction of the first connecting part is arranged on the first connecting part, one end of the first guide groove facing the matching part is open, and the matching part is slidably connected in the first guide groove; the sliding part is surrounded by the first guide groove and drives the matching part to slide along the length direction of the first connecting part through the linkage structure; the first guide groove can provide sliding guidance for the matching part and at the same time can keep the sliding part always not exposed, with a clever design and two birds with one stone.

[0018] Preferably, the linkage structure includes a plug rod and a linkage inclined groove extending obliquely along the length direction of the first connecting part. The linkage inclined groove and the plug rod are respectively arranged on the matching part and the slider, and the plug rod is slidably connected in the linkage inclined groove; thereby driving the lumbar support member to slide along the length direction of the first connecting part; the cooperation between the plug rod and the linkage inclined groove can generate a component force on the matching part, so that the lumbar support member changes the support position.

[0019] Preferably, a receiving groove for receiving the sliding member is formed in the mating portion, and the linkage inclined groove is provided on the corresponding groove wall of the receiving groove; the receiving groove can accommodate the sliding member, further saving the volume occupied by the sliding member.

[0020] Preferably, at least two linkage inclined grooves spaced along the width direction of the first connecting portion are provided on the mating portion, and the number and positions of the insertion rods correspond to the linkage inclined grooves; the cooperation of at least two linkage inclined grooves and the corresponding insertion rods can make the linkage force received by the mating portion more stable.

[0021] Preferably, the extending direction of the linkage inclined groove forms an angle of ° with the length extending direction of the first connecting portion; this enables the mating portion to be maintained within a reasonable sliding range and ensures smooth force transmission between the linkage structures.

[0022] Preferably, the linkage structure includes a linkage portion connected to the sliding member, and the linkage portion and the sliding member form an L-shaped structure; an avoidance groove opening towards the linkage portion is provided on the mating portion; along the length direction of the first connecting portion, a first guiding inclined surface and a second guiding inclined surface are respectively provided on the corresponding side walls of the avoidance groove towards both sides of the linkage portion; the extending directions of the first guiding inclined surface and the second guiding inclined surface are the same; the sliding member slides along the width direction of the first connecting portion and drives the linkage portion to always slide within the avoidance groove to act on the first guiding inclined surface or the second guiding inclined surface, thereby causing the lumbar support member to extend or retract along the length direction of the first connecting portion.

[0023] Furthermore, a seat is provided, including the above-mentioned movable lumbar support adjusting mechanism.

[0024] Preferably, the seat includes a back support member, the mounting seat is directly or indirectly connected to the back support member, the first connecting portion of the mounting seat extends in the front-back direction, and the mating portion is slidably connected to the first connecting portion in the front-back direction, enabling the lumbar support member to change the support position in the front-back direction through the first adjusting assembly; the support position of the lumbar support member in the front-back direction of the seat can be adjusted.

[0025] Preferably, the seat includes a back support member, the mounting seat is directly or indirectly connected to the back support member, the first connecting portion of the mounting seat extends in the vertical direction, and the mating portion is slidably connected to the first connecting portion in the vertical direction, enabling the lumbar support member to change the support position in the vertical direction through the first adjusting assembly; the support position of the lumbar support member in the vertical direction of the seat can be adjusted.

[0026] Preferably, the seat includes a backrest support; the mounting base further includes a second connecting portion connected to the first connecting portion, the second connecting portion extends in the vertical direction, and the first connecting portion extends in the front-rear direction; the engaging portion is slidably connected to the first connecting portion in the front-rear direction; the second connecting portion is slidably connected to the backrest support in the vertical direction; a second adjusting assembly is provided between the second connecting portion and the backrest support, and the structure of the second adjusting assembly is exactly the same as that of the first adjusting assembly; so that while the lumbar support can change the support position in the front-rear direction through the first adjusting assembly, it can also change the support position in the vertical direction through the second adjusting assembly; enabling the lumbar support to have the function of adjusting the support position in both the front-rear direction and the vertical direction on the seat.

[0027] The beneficial effects of the present utility model adopting the above technical solutions are as follows:

[0028] 1. When adjusting the support position of the lumbar support, by rotating the control member in place, the sliding member under the spiral driving force can slide to the corresponding position and stay, so that the sliding member drives the engaging portion connected to the lumbar support to slide through the linkage structure. Due to the self-locking property of the spiral fit, the lumbar support will also stay at the corresponding position; the entire adjustment process does not rely on the toothing fit method, is simple to operate and noiseless, improving the use experience of the lumbar adjustment mechanism.

[0029] 2. The linkage structure is a mutually cooperating linkage chute and insertion rod, which is simple and efficient, and can convert the driving force of the control member acting on the sliding member into the driving force for the engaging portion, making the adjustment process of the position of the lumbar support more efficient.

[0030] 3. The movable lumbar adjustment mechanism can be arranged on the seat according to different design ideas, and can adjust the support position of the lumbar support in at least one of the front-rear direction and the vertical direction; enriching the functions of the seat and enabling the lumbar support to form a stable support for the waists of sitters with different body types and sitting postures. Description of the Drawings

[0031] Figure 1 Schematic diagram of the movable lumbar adjustment mechanism arranged on the backrest support;

[0032] Figure 2 Exploded view of the movable lumbar adjustment mechanism;

[0033] Figure 3 Exploded view of the first adjusting assembly;

[0034] Figure 4 Exploded view of the base and the movable lumbar adjustment mechanism;

[0035] Figure 5 Exploded view of the base and the movable lumbar adjustment mechanism from another angle;

[0036] Figure 6 Exploded view of the second adjustment component;

[0037] Figure 7 Structural schematic diagram of the mounting base;

[0038] Figure 8 Structural schematic diagram of the base;

[0039] Figure 9 Structural schematic diagram after the guiding rib and the first guiding groove are separated;

[0040] Figure 10 Schematic diagram of the cooperation between the first guiding inclined surface and the first contact inclined surface in Embodiment 2;

[0041] Figure 11 Schematic diagram of the cooperation between the second guiding inclined surface and the second contact inclined surface in Embodiment 2;

[0042] Each reference numeral is: 1 - mounting base, 1a - first connecting portion, 1b - second connecting portion, 2 - lumbar support member, 3 - first adjustment component, 3a - second adjustment component, 3s - control member, 4 - back support member, 5 - linkage portion, 11 - first guide groove, 12 - guiding rib, 13 - second guide groove, 14 - abutting wall, 21 - mating portion, 22 - linkage inclined groove, 23 - accommodating groove, 24 - first guide groove, 31 - transmission rod, 32 - handle, 33 - outer spiral tube, 41 - base, 42 - second guide groove, 43 - guide rail, 44 - blocking portion, 51 - first contact inclined surface, 52 - second contact inclined surface, 211 - first guiding inclined surface, 212 - second guiding inclined surface, 213 - avoiding groove, 331 - transmission hole, 341 - insertion rod, 342 - spiral hole. Detailed implementation manners

[0043] In order to more clearly understand the above 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 implementation manners. 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.

[0044] 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.

[0045] As Figures 1-11 shown, the present invention has multiple embodiments, and the specific implementation manners are as follows:

[0046] Embodiment 1: As Figures 1-9As shown in the figure, this embodiment provides a movable lumbar support adjusting mechanism, including:

[0047] A mounting seat 1, on which a first connecting portion 1a is provided;

[0048] A lumbar support member 2, on which a mating portion 21 is connected; along the length direction of the first connecting portion 1a, the mating portion 21 is slidably connected to the first connecting portion 1a;

[0049] A first adjusting assembly 3, arranged between the first connecting portion 1a and the mating portion 21, including a sliding member 34 and a control member 3s that is in screw fit with the sliding member 34. The control member 3s can rotate in place along its own axis and drive the sliding member 34 to slide along the width direction of the first connecting portion 1a and then stay at a corresponding position; a linkage structure is provided between the sliding member 34 and the mating portion 21, and the linkage structure can link the mating portion 21 to slide along the length direction of the first connecting portion 1a; thus, the control member 3a can transmit the driving force acting on the sliding member 34 to the mating portion 21.

[0050] The control member 3s can rotate in place along its own axis, thereby generating a screw driving force on the sliding member 34, so that the sliding member 34 drives the lumbar support member 2 to slide along the length direction of the first connecting portion 1a through the linkage structure and stay at a corresponding position.

[0051] Furthermore, as shown in Figures 2-4 、 Figure 9 , the control member 3s includes a screw column passing through the first connecting portion 1a. The sliding member 34 is provided with a screw hole 342 extending along its own width direction. The screw column is in fit with the screw hole 342. The outer end of the screw column is connected with a handle 32 exposed on the mounting seat 1; by rotating the handle 32, the screw column can rotate in place along its own axis, driving the sliding member 34 to a corresponding position, and due to the self-locking property after the screw column is in fit with the screw hole 342, the sliding member 34 can stay at a corresponding position.

[0052] Furthermore, the screw column is a split structure. The screw column includes an outer screw tube 33 that is in screw fit with the screw hole 342. A transmission rod 31 is inserted into the outer screw tube 33. The handle 32 is connected to the outer end of the transmission rod 31; the outer screw tube 33 includes a transmission hole 331 inside itself. The transmission rod 31 is inserted into the transmission hole 331 to drive the outer screw tube 33 to rotate in place; wherein the cross-sectional shape of the transmission hole 33 is non-circular. For example, the cross-sectional shape of the transmission hole 331 can be polygonal or cross-shaped, and the cross-sectional shape of the transmission rod 31 matches the cross-sectional shape of the transmission hole 331; the split structure design of the screw column enables the transmission rod 31 to be connected to the outer screw tube 33 in a plug-in manner, facilitating the installation of the first adjusting assembly 3.

[0053] Furthermore, for facilitating the sliding guidance of the fitting portion 21, a first guide groove 11 extending along the length direction of the first connecting portion 1a is provided on the first connecting portion 1a. One end of the first guide groove 11 facing the fitting portion 21 is open, and the fitting portion 21 is slidably connected within the first guide groove 11. Guide ribs 12 are provided on the inner wall of the first guide groove 11, and corresponding first guide grooves 24 are provided on the fitting portion 21. The guide ribs 12 cooperate with the first guide grooves 24. The sliding member 34 is surrounded by the first guide groove 11 and is linked with the fitting portion 21 to slide along the length direction of the first connecting portion 1a through a linkage structure. The first guide groove 11 can provide sliding guidance for the fitting portion 21 and at the same time can keep the sliding member 34 always not exposed. The design is ingenious and serves two purposes at once.

[0054] Furthermore, the linkage structure should be able to respond to the acting force of the sliding member 34 sliding along the first connecting portion 1a and apply the transmission force to the fitting portion 21, so that the lumbar support member 2 can extend or retract along the length direction of the first connecting portion 1a. Specifically, the linkage structure includes a plug rod 341 and a linkage inclined groove 22 extending obliquely along the length direction of the first connecting portion 1a. The linkage inclined groove 22 and the plug rod 341 are respectively provided on the fitting portion 21 and the slider. The plug rod 341 is slidably connected within the linkage inclined groove 22. Thus, the lumbar support member 2 is linked to slide along the length direction of the first connecting portion 1a. The cooperation between the plug rod 341 and the linkage inclined groove 22 can generate a component force on the fitting portion 21, causing the lumbar support member 2 to change the support position.

[0055] Furthermore, for optimizing the layout and space of the adjustment mechanism, a receiving groove 23 for receiving the sliding member 34 is formed on the fitting portion 21, and the linkage inclined groove 22 is provided on the corresponding groove wall of the receiving groove 23. The receiving groove 23 can receive the sliding member 34, further saving the volume occupied by the sliding member 34.

[0056] Furthermore, to ensure the acting force received by the fitting portion 21 remains stable, at least two linkage inclined grooves 22 spaced along the width direction of the first connecting portion 1a are provided on the fitting portion 21. The number and positions of the plug rods 341 correspond to the linkage inclined grooves 22. The cooperation between at least two linkage inclined grooves 22 and the corresponding plug rods 341 can form multiple acting points, making the linkage force received by the fitting portion 21 more stable.

[0057] Furthermore, the inclination angle of the linkage inclined groove 22 relative to the length direction of the first connecting portion 1a needs to be kept within a reasonable range. If the inclination angle is too large, the sliding stroke of the fitting portion 21 is longer, but the force received by the groove wall of the linkage inclined groove 22 is too large. If the inclination angle is too small, although the force received by the groove wall of the linkage inclined groove 22 is smaller, the sliding stroke of the fitting portion 21 will become smaller. Therefore, in this embodiment, the extending direction of the linkage inclined groove 22 forms a 45° angle with the length extending direction of the first connecting portion 1a, enabling the fitting portion 21 to be kept within a reasonable sliding range and ensuring the force balance between the linkage structures.

[0058] As Figure 1 , Figures 4-8 shown, a seat is further provided, including the movable lumbar support adjusting mechanism described above. The movable lumbar support adjusting mechanism can be arranged on the seat in various ways. In this embodiment, three setting schemes are provided. The first scheme can realize the position adjustment of the lumbar support member 2 in the front-back direction. Specifically, the seat includes a back support member 4, and the mounting seat 1 is directly or indirectly connected to the back support member 4. Direct connection means that the mounting seat 1 is directly slidably connected to the back support member 4, and indirect connection means that a base 41 is provided at the front end of the back support member 4, and the mounting seat 1 is connected to the base 41. The first connecting portion 1a of the mounting seat 1 extends in the front-back direction, and the engaging portion 21 is slidably connected to the first connecting portion 1a in the front-back direction, so that the lumbar support member 2 can change the support position in the front-back direction through the first adjusting assembly 3. The support position of the lumbar support member 2 in the front-back direction of the seat can be adjusted, and the waist of the seated person can be supported in the front-back direction to adapt to seated persons with different postures and sitting postures.

[0059] Furthermore, the second scheme can realize the position adjustment of the lumbar support member 2 in the vertical direction. Specifically, the seat includes a back support member 4, and the mounting seat 1 is directly or indirectly connected to the back support member 4. Direct connection means that the mounting seat 1 is directly slidably connected to the back support member 4, and indirect connection means that a base 41 is provided at the front end of the back support member 4, and the mounting seat 1 is connected to the base 41. The first connecting portion 1a of the mounting seat 1 extends in the vertical direction, and the engaging portion 21 is slidably connected to the first connecting portion 1a in the vertical direction, so that the lumbar support member 2 can change the support position in the vertical direction through the first adjusting assembly 3. The support position of the lumbar support member 2 in the vertical direction of the seat can be adjusted, and the waist of the seated person can be supported in the vertical direction to adapt to seated persons with different postures and sitting postures.

[0060] Furthermore, the third scheme can realize the position adjustment of the lumbar support member 2 in both the front-back direction and the vertical direction, forming a four-way adjustment effect. Specifically, the seat includes a back support member 4. The mounting seat 1 further includes a second connecting portion 1b connected to the first connecting portion 1a. The second connecting portion 1b extends in the vertical direction, and the first connecting portion 1a extends in the front-back direction. The engaging portion 21 is slidably connected to the first connecting portion 1a in the front-back direction. The second connecting portion 1b is slidably connected to the back support member 4 in the vertical direction. In this embodiment, a base 41 is provided at the front end of the back support member 4, and the second connecting portion 1b is slidably connected to the base 41 in the longitudinal direction. A second adjusting assembly 3a is provided between the second connecting portion 1b and the back support member 4, and the structure of the second adjusting assembly 3a is exactly the same as that of the first adjusting assembly 3. While the lumbar support member 2 can change the support position in the front-back direction through the first adjusting assembly 3, it can also change the support position in the vertical direction through the second adjusting assembly 3a. The lumbar support member 2 has the function of adjusting the support position in both the front-back direction and the vertical direction on the seat.

[0061] Furthermore, in the third solution, in order to guide the second connecting portion 1b, a base 41 is provided at the front end of the back support member 4, and the second connecting portion 1b of the mounting seat 1 is slidably connected to the base 41 in the longitudinal direction; a second guide groove 42 extending longitudinally is provided on the base 41, and the second connecting portion 1b is slidably connected in the second guide groove 42. Among them, a guide rail 43 is provided in the second guide groove 42, and the second connecting portion 1b is provided with a second guide groove 13 matching therewith. In order to facilitate restricting the upward sliding range of the second connecting portion 1b, a protruding blocking portion 44 is provided on the groove wall of the second guide groove 42, and one end of the second connecting portion 1b facing the blocking portion 44 has an abutting wall 14. When the second connecting portion 1b slides to the uppermost end position of the second guide groove 42, the abutting wall 14 will contact the blocking portion 44 to play a limiting role.

[0062] Example 2: As Figures 10-11 shown, the difference between this embodiment and the above embodiment is that the linkage structure in this embodiment includes a linkage portion 5 connected to the sliding member 34, and the linkage portion 5 and the sliding member 34 form an L-shaped structure; an avoidance groove 213 opening towards the linkage portion 5 is provided on the matching portion 21; along the length direction of the first connecting portion 1a, a first guiding inclined surface 211 and a second guiding inclined surface 212 are respectively provided on the corresponding side walls of the avoidance groove 213 facing both sides of the linkage portion 5; the extending directions of the first guiding inclined surface 211 and the second guiding inclined surface 212 are the same; the sliding member 34 slides along the width direction of the first connecting portion 1a and drives the linkage portion 5 to always slide in the avoidance groove 213 to act on the first guiding inclined surface 211 or the second guiding inclined surface 212, so as to drive the lumbar support member 2 to extend or retract along the length direction of the first connecting portion 1a; for example, when the lumbar support member 2 needs to extend, at this time, the control member 3s rotates in place and generates a spiral driving force on the sliding member 34, so that the linkage portion 5 presses the second guiding inclined surface 212; when the lumbar support member 2 needs to retract, the control member 3s rotates reversely in place and generates a retracting spiral driving force on the sliding member 34, so that the linkage portion 5 presses the first guiding inclined surface 211, and the extended lumbar support member 2 retracts again.

[0063] Furthermore, in order to ensure smooth contact, a first contact inclined surface 51 and a second contact inclined surface 52 that respectively cooperate with the first guiding inclined surface 211 and the second guiding inclined surface 212 are provided on the linkage portion 5 facing upwards, and the extending directions of the first contact inclined surface 51 and the second contact inclined surface 52 are the same as the extending directions of the first guiding inclined surface 211 and the second guiding inclined surface 212; when the linkage portion 5 acts on the first guiding inclined surface 211 or the second guiding inclined surface 212, a surface contact can be formed, making the acting process of the linkage portion 5 on the corresponding guiding inclined surface smoother.

[0064] The above has schematically described the present utility model and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired thereby and, without departing from the gist of the creation of the present utility model, creatively design structural manners and embodiments similar to the technical solution, they shall fall within the protection scope of the present utility model.

Claims

1. An adjustable mechanism for a movable lumbar support, characterized by comprising: A mounting base (1), on which a first connecting portion (1a) is provided; A lumbar support member (2), with a mating portion (21) connected thereto; along the length direction of the first connecting portion (1a), the mating portion (21) is slidably connected to the first connecting portion (1a); A first adjusting assembly (3), disposed between the first connecting portion (1a) and the mating portion (21), including a sliding member (34) and a control member (3s) that is in screw fit with the sliding member (34). The control member (3s) can rotate in place along its own axis and drive the sliding member (34) to slide along the width direction of the first connecting portion (1a) and then stay at a corresponding position; there is a linkage structure between the sliding member (34) and the mating portion (21), and the linkage structure can link the mating portion (21) to slide along the length direction of the first connecting portion (1a); The control member (3s) can rotate in place along its own axis, so that the sliding member (34) drives the lumbar support member (2) to slide along the length direction of the first connecting portion (1a) through the linkage structure and stay at a corresponding position.

2. The movable lumbar support adjusting mechanism according to claim 1, wherein: The control member (3s) includes a screw column passing through the first connecting portion (1a). The sliding member (34) is provided with a screw hole (342) extending along its own width direction, and the screw column is in fit with the screw hole (342); the outer end of the screw column is connected with a handle (32) exposed on the mounting base (1).

3. The movable lumbar support adjusting mechanism according to claim 2, characterized in that: The screw column includes an outer screw tube (33) that is in screw fit with the screw hole (342). A transmission rod (31) is inserted into the outer screw tube (33). The handle (32) is connected to the outer end of the transmission rod (31); the outer screw tube (33) includes a transmission hole (331) inside itself, and the transmission rod (31) is inserted into the transmission hole (331) to drive the outer screw tube (33) to rotate in place.

4. The movable lumbar support adjusting mechanism according to claim 3, characterized in that: The cross-sectional shape of the transmission hole (331) is polygonal or cross-shaped, and the cross-sectional shape of the transmission rod (31) matches the cross-sectional shape of the transmission hole (331).

5. The movable lumbar support adjusting mechanism according to claim 1, characterized in that: The first connecting portion (1a) is provided with a first guide groove (11) extending along its own length direction. One end of the first guide groove (11) facing the mating portion (21) is open, and the mating portion (21) is slidably connected in the first guide groove (11); the sliding member (34) is surrounded by the first guide groove (11) and drives the mating portion (21) to slide along the length direction of the first connecting portion (1a) through the linkage structure.

6. The movable lumbar support adjusting mechanism according to claim 1, characterized in that: The linkage structure includes a plug rod (341) and a linkage inclined groove (22) extending obliquely along the length direction of the first connecting portion (1a). The linkage inclined groove (22) and the plug rod (341) are respectively arranged on the mating portion (21) and the slider, and the plug rod (341) is slidably connected in the linkage inclined groove (22); thereby driving the lumbar support member (2) to slide along the length direction of the first connecting portion (1a).

7. The movable lumbar support adjusting mechanism according to claim 6, characterized in that: The mating portion (21) is provided with a receiving groove (23) for receiving the sliding member (34), and the linkage inclined groove (22) is arranged on the corresponding groove wall of the receiving groove (23).

8. The movable lumbar support adjusting mechanism according to claim 6, wherein: On the mating part (21), there are provided at least two linkage inclined slots (22) spaced along the width direction of the first connecting part (1a), and the number and positions of the inserting rods (341) correspond to those of the linkage inclined slots (22).

9. The movable lumbar support adjusting mechanism according to claim 6, characterized in that: The extending direction of the linkage inclined slot (22) forms a 45° angle with the length extending direction of the first connecting part (1a).

10. The movable lumbar support adjusting mechanism according to claim 1, characterized in that: The linkage structure includes a linkage part (5) connected to the sliding part (34), and the linkage part (5) and the sliding part (34) form an L-shaped structure; on the mating part (21), there is provided an avoidance slot (213) opening towards the linkage part (5); along the length direction of the first connecting part (1a), on the corresponding side walls of the avoidance slot (213) towards both sides of the linkage part (5), there are respectively provided a first guiding inclined surface (211) and a second guiding inclined surface (212); the extending directions of the first guiding inclined surface (211) and the second guiding inclined surface (212) are the same; the sliding part (34) slides along the width direction of the first connecting part (1a), and drives the linkage part (5) to always slide within the avoidance slot (213), so as to act on the first guiding inclined surface (211) or the second guiding inclined surface (212), thereby making the lumbar support member (2) extend or retract along the length direction of the first connecting part (1a).

11. A seat, characterized in that: It includes the movable lumbar support adjusting mechanism described in Claim 1.

12. The seat according to claim 11, characterized in that: The seat includes a back support member (4), the mounting seat (1) is directly or indirectly connected to the back support member (4), the first connecting part (1a) of the mounting seat (1) extends in the front-back direction, and the mating part (21) is slidably connected to the first connecting part (1a) in the front-back direction, so that the lumbar support member (2) can change the support position in the front-back direction through the first adjusting assembly (3).

13. The seat according to claim 11, characterized in that: The seat includes a back support member (4), the mounting seat (1) is directly or indirectly connected to the back support member (4), the first connecting part (1a) of the mounting seat (1) extends in the vertical direction, and the mating part (21) is slidably connected to the first connecting part (1a) in the vertical direction, so that the lumbar support member (2) can change the support position in the vertical direction through the first adjusting assembly (3).

14. The seat according to claim 11, characterized in that: The seat includes a back support member (4); the mounting seat (1) further includes a second connecting part (1b) connected to the first connecting part (1a), the second connecting part (1b) extends in the vertical direction, and the first connecting part (1a) extends in the front-back direction; the mating part (21) is slidably connected to the first connecting part (1a) in the front-back direction; the second connecting part (1b) is slidably connected to the back support member (4) in the vertical direction; between the second connecting part (1b) and the back support member (4), there is provided a second adjusting assembly (3a), and the structure of the second adjusting assembly (3a) is exactly the same as that of the first adjusting assembly (3); so that while the lumbar support member (2) can change the support position in the front-back direction through the first adjusting assembly (3), it can also change the support position in the vertical direction through the second adjusting assembly (3a).

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