A lumbar support adjustment device and a lumbar support

Abstract

The utility model discloses a lumbar support adjusting device and lumbar support belong to lumbar support technical field, include: pedestal has a plurality of mutually parallel guide post, movable piece has a plurality of with the guide groove of guide post adaptation, elastic piece sets up between the pedestal and movable piece to force movable piece to move from first position to second position, and when first position moves to second position, the distance between movable piece and pedestal gradually increases, to this realization each seat lumbar support part's height adjustment.

Description

Technical Field

[0001] This utility model relates to the field of lumbar support technology, and in particular to a lumbar support adjustment device and a lumbar support. Background Technology

[0002] In existing technologies, lumbar support adjustment devices for seats generally adopt rigid adjustment structures (such as snap-locking, gear transmission, screw transmission, etc. to adjust the lumbar support height). Their drawbacks lie in the lack of cushioning during adjustment and adaptability to the user's dynamic needs. For example, in rigid lumbar support adjustment devices, the lumbar support is in rigid contact with the user's lower back. When the user suddenly leans back or moves, the instantaneous impact force cannot be effectively cushioned, leading to user discomfort. Furthermore, the support force of traditional devices is determined by the rigidity of the mechanical structure, making it impossible to make adaptive adjustments according to the needs of different users.

[0003] Therefore, there is a need to provide a lumbar support adjustment device. Utility Model Content

[0004] This utility model provides a lumbar support adjustment device and a lumbar support to solve the problems in the prior art.

[0005] The present invention adopts the following technical solution: a lumbar support adjustment device, comprising: a base having a plurality of mutually parallel guide columns; a movable member having a plurality of guide grooves adapted to the guide columns, and the movable member being movably connected to the guide columns of the base through the guide grooves; an elastic member disposed between the base and the movable member, and capable of bending under external force to force the movable member to move from a first position to a second position in a direction parallel to the axial direction of the guide columns; during the process of the movable member moving from the first position to the second position, the distance between the movable member and the base gradually increases.

[0006] Preferably, the elastic member includes: a deformable portion; a first connecting portion located at one end of the deformable portion; and a second connecting portion located at the other end of the deformable portion. When the movable member is in the second position, the deformable portion is in an arched, bent state, and the straight-line distance between the first connecting portion and the second connecting portion is less than the straight-line distance between the first connecting portion and the second connecting portion when the movable member is in the first position.

[0007] Preferably, the lumbar support adjustment device further includes: a pull cord, the first end of which is connected to the first connecting portion; a pull cord sleeve, which is sleeved outside the pull cord and is movable relative to the pull cord; the first end of the pull cord sleeve is limited to the second connecting portion; and an operating portion, which is connected to the second end of the pull cord, and the second end of the pull cord sleeve is limited to the operating portion, so that the pull cord can be forced to move relative to the pull cord sleeve when the operating portion is driven.

[0008] Preferably, the base further includes: a bearing surface for bearing the deformable part; a first sliding groove located at one end of the bearing surface; a second sliding groove located at the other end of the bearing surface; the first connecting part is slidably engaged in the first sliding groove, and the second connecting part is slidably engaged in the second sliding groove.

[0009] Preferably, the bottom surface of the first slide groove is a curved surface that smoothly transitions to the bearing surface, and the height difference between the bottom surface of the first slide groove and the bearing surface gradually increases along a first direction away from the center of the bearing surface from the junction of the first slide groove and the bearing surface; the first direction is the sliding direction of the first connecting part in the first slide groove when the movable part moves from the second position to the first position.

[0010] Preferably, the bottom surface of the second slide groove is a curved surface that smoothly transitions to the bearing surface, and the height difference between the bottom surface of the second slide groove and the bearing surface gradually increases along a second direction away from the center of the bearing surface at the junction of the second slide groove and the bearing surface; the second direction is the sliding direction of the second connecting part in the second slide groove when the movable part moves from the second position to the first position.

[0011] Preferably, the first connecting portion and / or the second connecting portion have protrusions that extend beyond the surface of the deformable portion; when the movable member is in the first position, the gap between the bearing surface and the movable member is less than the height of the protrusions.

[0012] Preferably, when the movable part is in the first position, the lower surface of the protrusion is in contact with the bottom surface of the first slide groove and / or the second slide groove, and the upper surface of the protrusion is in contact with the lower surface of the movable part.

[0013] A lumbar support includes a lumbar support body, and the lumbar support also includes the lumbar support adjustment device described above, wherein the movable component is connected to the lumbar support body.

[0014] Preferably, the movable component is also equipped with a massage head for massage.

[0015] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects: Firstly, this lumbar support adjustment device achieves height adjustment of the lumbar support area for various types of seats through the combined action of a base, a movable component, and an elastic component. When an external force is applied to the elastic component, it bends and deforms, generating an upward elastic force that pushes the movable component along the guide post from its initial first position to a second position further away from the base, gradually increasing the distance between them. After the external force is removed, the elastic component returns to its initial state, and the movable component can slide back to its initial position (this can be achieved in various ways, such as when the user is sitting in the seat, the movable component slides back to its initial position under the force of the user's lower back), thus achieving reset. Furthermore, when the elastic component bends and deforms under external force, it can absorb the instantaneous impact force through its elastic properties, thus offsetting the impact and avoiding the hard contact between the user's lower back and the lumbar support in the rigid structure of traditional lumbar support adjustment devices, thereby greatly improving the user's experience. Furthermore, the support force provided by the elastic element varies as the moving part transitions from the first position to the second position. In the initial stage (near the first position): the elastic element's deformation is small, and the support force is weak, providing relatively flexible support to the user. In the middle stage: the elastic element's deformation increases, and the support force increases accordingly, ensuring the moving part remains stable in any position, providing stable support to the user. In the final extreme position (second position): the elastic element reaches its maximum deformation, providing relatively more stable support to the user. Therefore, the moving part provides gradually increasing support to the user as it transitions from the first position to the second position. Thus, users can adaptively adjust the support force of the elastic element according to their actual usage needs.

[0016] Secondly, when the user operates the control unit to pull the cable, the first connecting part and the second connecting part move towards each other (both moving towards the center of the deformable part), forcing the deformable part to bend and deform. Due to the change in the height of the bottom surface of the slide (first slide and second slide), the sliding of the first connecting part and the second connecting part in the first slide and the second slide will form an upward lifting trajectory. Compared with the horizontal bottom surface of the slide (first slide and second slide), under the same horizontal displacement of the deformable part, a greater displacement between the moving part and the base is achieved, thereby driving the moving part to rise quickly to a higher position.

[0017] Third, since the sliding trajectory of the protrusion in the corresponding groove (first groove or second groove) is guided entirely by its curved bottom surface, it ensures that the first connecting part and the second connecting part only move in the preset direction (close to the center of the base and raised upward), avoiding the deformation part from being twisted by lateral forces in other directions. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1This is a three-dimensional structural diagram of the lumbar support adjustment device when the movable part of this utility model is in the first position; Figure 2 This is a cross-sectional view of the lumbar support adjustment device of this utility model when the movable part is in the first position; Figure 3 This is an exploded view of the base and elastic element of this utility model; Figure 4 This is an exploded view of the lumbar support adjustment device of this utility model; Figure 5 This is a three-dimensional structural diagram of the lumbar support adjustment device when the movable part of this utility model is in the second position; Figure 6 This is a cross-sectional view of the lumbar support adjustment device of this utility model when the movable part is in the second position; Figure 7 This is a schematic diagram of the structure of the operating part of this utility model.

[0019] Figure Labels 1-Base; 11-Guide post; 12-Bearing surface; 13-First slide groove; 14-Second slide groove; 2-Moving part; 21-Guide groove; 3-Elastic element; 31-Deformable part; 32-First connecting part; 33-Second connecting part; 34-Protrusion; 4- Pull the string; 5-Pull cord sleeve; 6-Operating unit; 61-Fixed base; 62-Knob; 63-Lead screw; 64-Moving block; 7-Tension spring; 200-Massage head. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0022] Reference Figures 1 to 7 As shown in the figure, this utility model embodiment provides a lumbar support adjustment device, which mainly includes a base 1, a movable part 2 and an elastic part 3.

[0023] The base 1 has a plurality of parallel guide posts 11; the movable member 2 has a plurality of guide grooves 21 adapted to the guide posts 11, and the movable member 2 is movably connected to the guide posts 11 of the base 1 through the guide grooves 21; the elastic member 3 is disposed between the base 1 and the movable member 2, and can be bent under the action of external force to force the movable member 2 to move from a first position to a second position in a direction parallel to the axial direction of the guide posts 11; during the process of the movable member 2 moving from the first position to the second position, the distance between the movable member 2 and the base 1 gradually increases.

[0024] This lumbar support adjustment device can be used on various types of seats. Through the combined action of the base 1, the movable part 2, and the elastic part 3, the height of the lumbar support section of various seats can be adjusted. When the movable part 2 is in the first position, the elastic part 3 tends to be under no force or slight force, and the distance between the movable part 2 and the base 1 reaches the preset minimum value for actual use. Figure 2 As shown; when the movable part 3 is in the second position, the elastic part 3 is bent by external force, and the distance between the movable part 2 and the base 1 reaches the maximum value preset for actual use, as shown. Figure 6 As shown; (It should be noted that in some practical applications, a limiting part, such as a limiting screw, can be provided at the end of the guide post 11. When the movable part 2 abuts against the limiting part under the action of the elastic part 3, it reaches the second position; while if...) Figure 1 As shown, the movable part 2 moves to the bottom end of the guide post 11 and at least partially abuts against the base 1, thus reaching the first position; the guide post 11 of the base 1 and the guide groove 21 of the movable part 2 form a sliding fit, ensuring that the movable part 2 moves axially along the guide post 11. When an external force is applied to the elastic part 3, the elastic part 3 (such as an elastic sheet) undergoes bending deformation, pushing the movable part 2 along the guide post 11 from the initial first position to a second position away from the base 1, and the distance between the two gradually increases. After the external force is removed, the elastic part 3 returns to its initial state, and the movable part 2 can slide back to the initial position (there are many ways to achieve this, for example, when the user is sitting in the seat, the movable part slides back to the initial position under the force of the user's waist), thus achieving a reset.

[0025] In addition, when the elastic element 3 bends and deforms under external force, it can absorb the instantaneous impact force (such as the sudden force applied when the user leans on it) through its elastic properties to offset the impact and avoid the hard contact between the user's waist and the lumbar support in the rigid structure of the traditional lumbar support adjustment device, thereby greatly improving the user's experience.

[0026] Furthermore, the support provided by the elastic element 3 varies as the movable part 2 moves from the first position to the second position. In the initial stage (near the first position): the elastic element 3 has a small deformation and weak support, providing relatively flexible support to the user. In the middle stage: the deformation of the elastic element 3 increases, and the support increases accordingly, ensuring the movable part 2 remains stable in any position, providing stable support to the user. In the final extreme position (second position): the elastic element 3 reaches its maximum deformation, providing relatively more stable support to the user. Therefore, the movable part 2 provides gradually increasing support to the user as it moves from the first position to the second position. Thus, the user can adaptively adjust the support of the elastic element 3 according to their actual usage needs.

[0027] In some practical applications, the elastic element 3 includes a deformable portion 31, a first connecting portion 32, and a second connecting portion 33; the first connecting portion 32 is located at one end of the deformable portion 31, and the second connecting portion 33 is located at the other end of the deformable portion 31; the entire elastic element 3 is formed as a sheet structure in which the first connecting portion 32, the deformable portion 31, and the second connecting portion 33 are connected in sequence (the elastic element is actually made of virgin PP material, which refers to unused and unrecycled virgin polypropylene resin. Sheet elastic elements made of this material can maintain stable elastic recovery performance and a certain toughness during repeated deformation; the thickness of the deformable portion 31 gradually decreases from both sides to the middle along its length direction, with the thinnest thickness in the middle of the deformable portion 31 being in the range of 2.2-2.4mm, and the maximum thickness on both sides of the deformable portion 31 being 0.2-0.4mm greater than the thinnest thickness; it should be noted that the length direction of the deformable portion 31 is the straight line direction between the first connecting portion 32 and the second connecting portion 33). When the movable member 2 is in the second position, the deformable part 31 is in an arched, bent state, and the straight-line distance between the first connecting part 32 and the second connecting part 33 at this time is recorded as the first distance; when the movable member 2 is in the first position, the straight-line distance between the first connecting part 32 and the second connecting part 33 is recorded as the second distance. The first distance is less than the second distance.

[0028] In this embodiment, when the movable member 2 is in the first position (initial state), the deformation portion 31 of the elastic member 3 is not under force and is in a naturally extended state. At this time, the straight-line distance between the first connecting portion 32 and the second connecting portion 33 is a relatively long second distance. Under the action of external force, the deformation portion 31 is forced to bend into an arch shape, and the movable member 2 moves upward along the guide post 11 to the second position. The straight-line distance between the first connecting portion 32 and the second connecting portion 33 is shortened to a relatively short first distance. At this time, the elastic potential energy of the elastic member 3 is stored in the deformation portion 31. The bending deformation of the deformation portion 31 forces the movable member 2 away from the base 1. After the external force is removed, the deformation portion 31 returns to its naturally extended state, and the movable member 2 can also return to the initial state. In summary, when the deformation portion 31 is not bent, the overall structure of the lumbar support adjustment device is more compact and occupies less space.

[0029] Specifically, a plurality of tension springs 7 are connected between the base 1 and the movable member 2, which force the movable member 2 to tend towards the first position. That is, when the movable member 2 is in the first position (initial state), the tension springs 7 are in a naturally relaxed or slightly stretched state, and the tension on the movable member 2 is small; at this time, the deformation part 31 of the elastic member 3 is not under force. Under the action of external force, the deformation part 31 of the elastic member 3 bends and arches, pushing the movable member 2 to move towards the second position; at the same time, the tension springs 7 are stretched, generating a downward pulling force.

[0030] When the external force is removed, the tension of the tension spring 7 can not only overcome the residual deformation force of the elastic element 3, but also force the movable element 2 to move down to the first position, so as to achieve rapid automatic reset and ensure that the movable element 2 can be fully reset to the initial state every time.

[0031] In other practical applications, the lumbar support adjustment device also includes a pull cable 4, a pull cable sleeve 5, and an operating part 6.

[0032] The first end of the pull wire 4 is connected to the first connecting part 32; the pull wire sleeve 5 is sleeved on the outside of the pull wire 4 and can move relative to the pull wire 4; the first end of the pull wire sleeve 5 is limited to the second connecting part 33; the operating part 6 is connected to the second end of the pull wire 4, and the second end of the pull wire sleeve 5 is limited to the operating part 6, so that when the operating part 6 is driven, the pull wire 4 can be forced to move relative to the pull wire sleeve 5, that is, when the pull wire 4 is subjected to the pulling force given by the operating part 6, the pull wire 4 can move relative to the pull wire sleeve 5, thereby pulling the elastic member 3 to deform, so that the deformed part 31 is in an arched bent state.

[0033] Specifically, the operating unit 6 includes a fixed base 61 and a knob 62. A lead screw 63 is rotatably connected to the fixed base 61. One end of the lead screw 63 extends out of the fixed base 61 and is connected to the knob 62. A movable block 64 is threadedly connected to the lead screw 63. When the lead screw 63 rotates, the movable block 64 moves along the axial direction of the lead screw 63 and is restricted from rotating by the fixed base 61. The movable block 64 is connected to the second end of the pull wire 4, and the second end of the pull wire sleeve 5 abuts against the fixed base 61. Therefore, by rotating the knob 62, the operator can drive the lead screw 63 to rotate, and the movable block 64 can move along the axial direction of the lead screw 63 to pull the pull wire 4 relative to the pull wire sleeve 5.

[0034] In some practical applications, based on the above implementation: the base 1 further includes a bearing surface 12, a first sliding groove 13 and a second sliding groove 14; the bearing surface 12 is used to bear the deformable part 31; the first sliding groove 13 is located at one end of the bearing surface 12; the second sliding groove 14 is located at the other end of the bearing surface 12; the first connecting part 32 is slidably engaged in the first sliding groove 13, and the second connecting part 33 is slidably engaged in the second sliding groove 14.

[0035] Specifically, the bottom surface of the first slide groove 13 is a curved surface that smoothly transitions to the bearing surface 12, and the height difference between the bottom surface of the first slide groove 13 and the bearing surface 12 gradually increases along a first direction away from the center of the bearing surface 12 at the junction of the first slide groove 13 and the bearing surface 12; the first direction is the sliding direction of the first connecting part 32 in the first slide groove 13 when the movable part 2 moves from the second position to the first position.

[0036] Specifically, the bottom surface of the second slide groove 14 is a curved surface that smoothly transitions to the bearing surface 12, and the height difference between the bottom surface of the second slide groove 14 and the bearing surface 12 gradually increases along a second direction away from the center of the bearing surface 12 at the junction of the second slide groove 14 and the bearing surface 12; the second direction is the sliding direction of the second connecting part 33 in the second slide groove 14 when the movable part 2 moves from the second position to the first position.

[0037] When the movable part 2 is in the first position, the first connecting part 32 is located in the first slide groove 13, and the second connecting part 33 is located in the second slide groove 14. The first connecting part 32 and the second connecting part 33 sink relative to the deformable part 31 due to the height difference between the bottom surface of the corresponding slide groove (first slide groove or second slide groove) and the bearing surface 12, and show a downward bending trend.

[0038] When the user operates the operating unit 6 to pull the cable 4, the first connecting part 32 and the second connecting part 33 move towards each other (both moving towards the center of the deformable part 31), forcing the deformable part 31 to bend and deform; at the same time, due to the change in the height of the bottom surface of the slide (first slide 13 and second slide 14) (the height difference between the bottom surface of the first slide 13 and the bearing surface 12 gradually increases along the first direction away from the center of the bearing surface 12 from the junction of the first slide 13 and the bearing surface 12; the height difference between the bottom surface of the second slide 14 and the bearing surface 12 gradually increases along the second direction away from the center of the bearing surface 12 from the junction of the second slide 14 and the bearing surface 12), the sliding of the first connecting part 32 and the second connecting part 33 in the first slide 13 and the second slide 14 will form an upward ( Figure 6 As shown, the lifting trajectory of the movable part 2 (the first slide 13 and the second slide 14) achieves a greater displacement between the movable part 2 and the base 1 when the horizontal displacement of the deformable part 31 (the relative movement distance between the first connecting part 32 and the second connecting part 33) is the same, compared to the bottom surface of the horizontal slide (the first slide 13 and the second slide 14), thereby driving the movable part 2 to rise quickly to a higher position.

[0039] In other practical applications, based on any of the above embodiments: a protrusion 34 is formed on the first connecting portion 32 and / or the second connecting portion 33, protruding beyond the surface of the deformable portion 31 (in actual use, the overall thickness at the deformable portion is 2.3 mm, and the overall thickness at the protrusion 34 is 5.6 mm); when the movable member 2 is in the first position, the gap between the bearing surface 12 and the movable member 2 is less than the height of the protrusion 34. Furthermore, when the movable member 2 is in the first position, the lower surface of the protrusion 34 is in contact with the bottom surface of the first sliding groove 13 and / or the second sliding groove 14, and the upper surface of the protrusion 34 is in contact with the lower surface of the movable member 2.

[0040] like Figure 1 , Figure 2 As shown, when the movable part 2 is in the first position (initial state), the lower surface of the protrusion 34 of the first connecting part 32 and / or the second connecting part 33 is in contact with the bottom surface of the first slide groove 13 and / or the second slide groove 14, and the upper surface of the protrusion 34 is in contact with the lower surface of the movable part 2. Since the gap between the bearing surface 12 and the movable part 2 is less than the height of the protrusion 34, the first connecting part 32 is clamped and fixed between the first slide groove 13 and the movable part 2, and the second connecting part 33 is clamped and fixed between the second slide groove 14 and the movable part 2. Therefore, the elastic part 3 cannot move in the vertical direction, and under the restriction of the first connecting part 32 and the second connecting part 33, the elastic part 3 cannot move in the lateral direction, which can effectively prevent the elastic part 3 from dislodging.

[0041] In addition, since the sliding trajectory of the protrusion 34 in the corresponding groove (first groove 13 or second groove 14) is guided entirely by its curved bottom surface, it ensures that the first connecting part 32 and the second connecting part 33 only move in a preset direction (close to the center of the base and raised upward), thus preventing the deformable part 31 from being twisted by lateral forces in other directions.

[0042] A lumbar support includes a lumbar support body and the aforementioned lumbar support adjustment device, wherein the movable member 2 is connected to the lumbar support body. A massage head 200 for massage is also installed on the movable member 2. A base 1 is used to connect to a seat back, enabling the lumbar support to be placed against the seat back.

[0043] The lumbar support body (not shown in the figure, in the prior art it is generally made of an outer breathable fabric and has a built-in sponge pad) is rigidly connected to the movable part 2 by buckles or bolts. The lifting and lowering of the movable part 2 directly drives the lumbar support body to move synchronously, so as to realize the adjustment of the support height. The massage head 200 is embedded in the upper surface of the movable part 2. Several silicone massage balls can be arranged in a matrix and driven to rotate by a micro motor (the motor can be integrated into the internal cavity of the movable part 2 and powered by an external power source).

[0044] The user pulls the cable 4 via the operating part 6 (knob 62 / pull rod) on the side of the seat, which drives the elastic element 3 to deform. The movable part 2 lifts the lumbar support body to the target height, and the tension spring 7 ensures that it returns to its original position after the external force is removed. After the adjustment is in place, the massage switch is turned on, and the massage head 200 moves on the support surface of the movable part 2. The vibration is transmitted to the user's waist muscles through the fabric of the lumbar support body, so as to achieve the synchronous effect of support and massage.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A lumbar support adjustment device, characterized in that, include: The base (1) has several parallel guide columns (11). The movable part (2) has a number of guide grooves (21) adapted to the guide post (11), and the movable part (2) is movably connected to the guide post (11) of the base (1) through the guide grooves (21); The elastic element (3) is disposed between the base (1) and the movable element (2) and is capable of bending under external force to force the movable element (2) to move from the first position to the second position in a direction parallel to the axial direction of the guide post (11); As the movable part (2) moves from the first position to the second position, the distance between the movable part (2) and the base (1) gradually increases.

2. The lumbar support adjustment device according to claim 1, characterized in that, The elastic element (3) includes: Deformation part (31); The first connecting part (32) is located at one end of the deformable part (31); The second connecting part (33) is located at the other end of the deformable part (31); When the movable part (2) is in the second position, the deformable part (31) is in an arched bent state, and the straight distance between the first connecting part (32) and the second connecting part (33) is smaller than the straight distance between the first connecting part (32) and the second connecting part (33) when the movable part (2) is in the first position.

3. The lumbar support adjustment device according to claim 2, characterized in that, The lumbar support adjustment device also includes: A pull wire (4) has its first end connected to the first connecting part (32); A pull cable sleeve (5) is fitted over the pull cable (4) and is movable relative to the pull cable (4); the first end of the pull cable sleeve (5) is limited to the second connecting part (33). An operating part (6) is connected to the second end of the pull wire (4), and the second end of the pull wire sleeve (5) is located in the operating part so that the pull wire (4) can be forced to move relative to the pull wire sleeve (5) when the operating part (6) is driven.

4. The lumbar support adjustment device according to claim 2, characterized in that, The base (1) further includes: The bearing surface (12) is used to support the deformed part (31). The first groove (13) is located at one end of the bearing surface (12); The second groove (14) is located at the other end of the bearing surface (12); The first connecting part (32) is slidably fitted in the first sliding groove (13), and the second connecting part (33) is slidably fitted in the second sliding groove (14).

5. The lumbar support adjustment device according to claim 4, characterized in that, The bottom surface of the first slide groove (13) is a curved surface that smoothly transitions to the bearing surface (12). Along the first direction from the junction of the first slide groove (13) and the bearing surface (12) away from the center of the bearing surface (12), the height difference between the bottom surface of the first slide groove (13) and the bearing surface (12) gradually increases. The first direction is the sliding direction of the first connecting part (32) in the first slide groove (13) when the movable part (2) moves from the second position to the first position.

6. The lumbar support adjustment device according to claim 4, characterized in that, The bottom surface of the second slide groove (14) is a curved surface that smoothly transitions to the bearing surface (12). Along the second direction from the junction of the second slide groove (14) and the bearing surface (12) away from the center of the bearing surface (12), the height difference between the bottom surface of the second slide groove (14) and the bearing surface (12) gradually increases. The second direction is the sliding direction of the second connecting part (33) in the second slide groove (14) when the movable part (2) moves from the second position to the first position.

7. The lumbar support adjustment device according to claim 4, characterized in that, The first connecting part (32) and / or the second connecting part (33) have protrusions (34) that protrude from the surface of the deformable part (31); when the movable part (2) is in the first position, the gap between the bearing surface (12) and the movable part (2) is less than the height of the protrusion (34).

8. The lumbar support adjustment device according to claim 7, characterized in that, When the movable part (2) is in the first position, the lower surface of the protrusion (34) is attached to the bottom surface of the first slide groove (13) and / or the second slide groove (14), and the upper surface of the protrusion (34) is attached to the lower surface of the movable part (2).

9. A lumbar support, comprising a lumbar support body, characterized in that: The lumbar support also includes the lumbar support adjustment device according to any one of claims 1-8, wherein the movable part (2) is connected to the lumbar support body.

10. The lumbar support according to claim 9, characterized in that, The movable part (2) is also equipped with a massage head (200) for massage.

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