Waist rest

Abstract

The utility model belongs to the technical field of waist rests, and particularly relates to a waist rest which comprises a supporting plate, a backup plate and a waist support are movably arranged on the supporting plate, a guide rail extending longitudinally is arranged on the supporting plate, two sets of sliding seats are arranged on the guide rail in a sliding mode, the backup plate and the waist support are arranged on the two sets of sliding seats respectively, and locking devices are arranged on the two sets of sliding seats. The locking device comprises a first elastic piece and a locking piece, positioning parts matched with the locking piece are arranged on the supporting plate, and the first elastic piece can drive the locking piece to be matched with different positioning parts or matched with different positions of the positioning parts, so that the sliding seat and the supporting plate are relatively fixed; when external force acts on the sliding seat, the locking piece can be separated from the positioning part or move relative to the positioning part, so that the height of the sliding seat on the supporting plate is adjusted, the height of the backup plate or the waist support on the supporting plate is adjusted, and the waist support is simple in structure and convenient to adjust and use.

Description

Technical Field

[0001] This utility model belongs to the field of lumbar support technology, and specifically relates to a lumbar support. Background Technology

[0002] A lumbar support is something a person leans against when sitting. Lumbar supports can improve the user's posture and reduce pressure on the spine and lower back.

[0003] Traditional lumbar supports are mostly support plates fixed to the seat, with flexible support parts installed on the support plate. To improve the comfort of lumbar supports, some lumbar supports have backrests and lumbar supports on the support plate. For example, a backrest disclosed in Chinese Utility Model Patent Application CN 202220636287.7 includes a support plate and two backrests, which are located on the left and right sides of the front end face of the support plate. It also includes a lumbar support, which is located on the lower middle side of the front end face of the support plate. The lumbar support includes a base, a support plate, and an adjustment mechanism. The base is located on the support plate, and the support plate is adjustable back and forth on the base via the adjustment mechanism. The adjustment mechanism includes a rack, a positioning element, and a reset elastic element. The rack extends back and forth at the rear end of the support plate and has first oblique teeth arranged along its length. The base has mounting holes for inserting the rack, and the positioning element can be adjusted relative to the first oblique teeth. The teeth are movably disposed on the base, and the positioning member is formed with a second helical tooth that meshes with the first helical tooth. The reset elastic member drives the positioning member to move toward the first helical tooth. The lumbar support is disposed on the support plate through a first connecting mechanism. The first connecting mechanism has a first elastic member that allows the lumbar support to float elastically back and forth. The first connecting mechanism includes a first locking plate, a first locking bolt, and a first elastic member. The support plate is formed with a bolt hole for the first locking bolt to pass through. The first locking plate is formed with a screw hole. After the first locking bolt passes through the bolt hole, it engages with the screw hole of the first locking plate. The first elastic member is connected between the first locking plate and the lumbar support.

[0004] The adjustment mechanism in the above structure makes it easy for users to adjust the distance between the tray and the support plate, but it cannot quickly adjust the height of the tray, making it inconvenient for users to adjust the tray according to their own needs and making it inconvenient for users to use. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a lumbar support that is simple in structure and easy to adjust.

[0006] The purpose of this utility model is achieved as follows:

[0007] A lumbar support includes a support plate, on which a backrest and a lumbar support are movably mounted. The support plate is provided with a longitudinally extending guide rail, and two sets of slide seats are slidably mounted on the guide rail. The backrest and lumbar support are respectively mounted on the two sets of slide seats, and each set of slide seats is provided with a locking device. The locking device includes a first elastic element and a locking element. The support plate is provided with a positioning part adapted to the locking element. The first elastic element can drive the locking element to cooperate with different positioning parts or with different positions of the positioning parts, thereby fixing the slide seat and the support plate relatively.

[0008] When an external force is applied to the slide, the locking element can disengage from or move relative to the positioning part, thereby adjusting the height of the slide on the support plate, and in turn adjusting the height of the backrest or lumbar support on the support plate.

[0009] The present invention is further configured such that: two horizontally distributed back plates are provided on the front side of the support plate, the slide includes a first slide for mounting the back plates, the first slide is provided with a longitudinally extending hinge shaft, the back plates are rotatably mounted on the first slide via the hinge shaft, the back plates can be flipped in the middle of the support plate via the hinge shaft, a second elastic element is provided between the first slide and the back plates, the second elastic element can drive the back plates to flip to the side of the support plate.

[0010] The present invention is further configured such that: two horizontally distributed lumbar supports are provided on the front side of the support plate, the slide includes a second slide for mounting the lumbar supports, the second slide is provided with a longitudinally extending hinge shaft, the lumbar supports are rotatably mounted on the second slide via the hinge shaft, the lumbar supports can be flipped in the middle of the support plate via the hinge shaft, a second elastic element is provided between the second slide and the back plate, the second elastic element can drive the back plate to flip to the side of the support plate.

[0011] The present invention is further configured such that: the second elastic element is a torsion spring, the torsion spring includes an elastic part, two drive arms are provided on the elastic part, the elastic part is sleeved on the hinge shaft, and a first positioning groove is provided on the slide, and a second positioning groove is provided on the back plate and the waist support, and the two drive arms of the torsion spring are respectively installed in the first positioning groove and the second positioning groove.

[0012] The present invention is further configured such that: the slide is provided with a hinge groove, and mounting holes are provided on both sides of the hinge groove; the backrest and the waist support are provided with hinge seats adapted to the hinge groove; the hinge seats are rotatably mounted in the hinge groove via a hinge shaft; the hinge shaft includes a hinge rod, one end of the hinge rod is provided with a limiting part, and the other end of the hinge rod is provided with an elastic hook; the limiting part abuts against the end of the mounting hole on one side of the hinge groove, and the elastic hook abuts against the end of the mounting hole on the other side of the hinge groove; under the action of external force, the elastic hook can deform and pass through the mounting hole and the hinge groove.

[0013] The present invention is further configured such that: the cross-section of the guide rail is L-shaped or T-shaped, and the slide block is provided with a guide groove adapted to the guide rail.

[0014] The present invention is further configured such that: at least two sets of guide grooves are provided on the slide block, and guide rails adapted to each guide groove are provided on the support plate.

[0015] The present invention is further configured such that: a stop block is provided on the support plate, the stop block is located between the two sets of slides, the stop block can limit the movement range of the slides, thereby avoiding interference or collision between the backrest and the lumbar support.

[0016] The present invention is further configured such that: a hinge portion is provided at the lower end of the support plate, and a seat plate is rotatably provided on the hinge portion; the support plate can be flipped and folded toward the seat plate, and the seat plate extends toward the rear side and upper side of the hinge portion to form a limiting wall; the seat plate can abut against the limiting wall and limit the maximum rotation angle between the seat plate and the support plate.

[0017] The present invention is further configured such that: a hinge groove is provided at the lower end of the support plate, and a seat plate or protective sleeve is detachably provided on the hinge groove by means of fasteners, and the protective sleeve can prevent debris from entering the hinge groove.

[0018] The advantages of this utility model compared to the prior art are:

[0019] 1. In this utility model, the backrest and lumbar support can slide relative to the support plate through two sets of sliding blocks, which makes it convenient for users to adjust the height of the backrest and lumbar support according to their needs. The structure is simple and convenient for users to adjust and use the lumbar support flexibly. In addition, the two sets of sliding blocks are fixed relative to the support plate through the first elastic element and the locking element. Furthermore, the height of the sliding block on the support plate can be adjusted by external force acting on the sliding block, which makes it convenient for users to adjust quickly and use.

[0020] 2. In this utility model, the two horizontally distributed backrests facilitate stable support of the lumbar support for the user's back. Since the backrests can be flipped in the middle of the hinged axial support plate, when the user's back is against the backrest, the backrest can be flipped towards the middle of the support plate and rest against the sides of the back, which is beneficial for the lumbar support to support the user's back and improves the comfort of the lumbar support. The two horizontally distributed lumbar supports facilitate stable support of the user's waist. Since the lumbar supports can be flipped in the middle of the hinged axial support plate, when the user's waist is against the lumbar supports, the lumbar supports can be flipped towards the middle of the support plate and rest against the sides of the waist, which is beneficial for the lumbar support to support the user's waist and improves the comfort of the lumbar support.

[0021] 3. In this utility model, the elastic part is sleeved on the hinge shaft, and the drive arm is respectively installed in the first positioning groove and the second positioning groove, which is conducive to the stable installation of the second elastic element and facilitates the assembly and production of the lumbar support; the hinge groove facilitates the positioning and installation of the backrest and the lumbar support protrusion slide, and because the hinge shaft is provided with an elastic hook, it is easy to quickly fix and install the hinge shaft, preventing the hinge shaft from detaching from the slide during the use of the lumbar support, which is conducive to the stable installation of the backrest and the lumbar support.

[0022] 4. The L-shaped or T-shaped guide groove in this utility model facilitates the stable installation of the slide and the support plate. The structure is simple and the slide can be easily adjusted for stability. At least two sets of guide grooves and guide rails facilitate the stable installation of the slide and prevent the backrest and lumbar support from tilting or swinging to both sides of the support plate during use. This is beneficial for the backrest and lumbar support to provide stable support for the user.

[0023] 5. The stop block in this utility model helps to prevent interference or collision between the backrest and lumbar support, making it convenient for users to adjust the backrest and lumbar support, and preventing the backrest and lumbar support from being too high or too low during use; the hinge part allows users to install a seat plate under the support plate as needed, facilitating the installation and use of the lumbar support; the limiting wall facilitates the stable unfolding of the seat plate and the support plate, making it convenient for users; in this structure, the seat plate or protective sleeve is installed on the hinge part by fasteners. When the user does not need to install the seat plate on the support plate, the protective sleeve can protect the hinge part, preventing damage to the hinge part or foreign objects from entering the hinge part. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the protective cover installed on the upper waist of this utility model;

[0025] Figure 2 This is a structural diagram of the middle waist support when the seat plate is installed in this utility model;

[0026] Figure 3 This is an exploded view of the protective cover installed on the upper waist of this utility model.

[0027] Figure 4 This is a partial sectional view of the connection structure between the backing plate and the support plate in this utility model;

[0028] Figure 5 This is a partial sectional view of the connection structure between the slide and the support plate in this utility model;

[0029] Figure 6 This is one of the structural schematic diagrams of the support plate in this utility model;

[0030] Figure 7 This is the second schematic diagram of the support plate in this utility model;

[0031] Figure 8 This is one of the structural schematic diagrams of the slide block in this utility model;

[0032] Figure 9 This is the second schematic diagram of the slide block in this utility model;

[0033] Figure 10 This is a schematic diagram of the structure of the backing plate in this utility model;

[0034] Figure 11This is an exploded view of the backing plate in this utility model;

[0035] Figure 12 This is a schematic diagram of the hinge seat in this utility model;

[0036] Figure 13 This is a schematic diagram of the structure of the middle seat plate of this utility model;

[0037] Figure 14 This is a cross-sectional view of the locking device in this utility model;

[0038] Figure 15 This is a schematic diagram of the hinge shaft in this utility model;

[0039] Figure 16 This is a schematic diagram of the structure of the second elastic element in this utility model.

[0040] The labels in the diagram mean: 1-Support plate; 11-Guide rail; 12-Stop; 13-Positioning part; 14-Hinge part; 15-Storage groove; 111-Fixing hole; 2-Slide; 21-Guide groove; 22-Hinge groove; 23-Mounting hole;

[0041] 24-First positioning groove; 25-Fixing groove; 3-Back plate; 31-Support plate; 32-Hinge seat; 33-Flexible pad; 34-Fixing buckle; 311-Positioning protrusion; 321-Hinge protrusion; 322-Second positioning groove; 323-Groove; 4-Waist support; 5-Protective sleeve; 51-Fastener; 6-Seat plate; 61-Connecting part; 62-Limiting wall; 7-Locking device; 71-Fixing seat; 72-First elastic element; 73-Locking element; 8-Hinge shaft; 81-Hinge rod; 82-Limiting part; 83-Elastic hook; 84-Guide surface; 9-Second elastic element; 91-Elastic part; 92-Drive arm. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0043] See Figures 1 to 16As shown, a lumbar support includes a support plate 1, on which a backrest 3 and a lumbar support 4 are movably mounted. A longitudinally extending guide rail 11 is provided on the support plate 1, and two sets of slide blocks 2 are slidably mounted on the guide rail 11. The backrest 3 and lumbar support 4 are respectively mounted on the two sets of slide blocks 2, and each set of slide blocks 2 is provided with a locking device 7. The locking device 7 includes a first elastic element 72 and a locking element 73. The support plate 1 is provided with a positioning part 13 adapted to the locking element 73. The first elastic element 72 can drive the locking element 73 to cooperate with different positioning parts 13 or with different positions of the positioning parts 13, thereby fixing the slide block 2 relative to the support plate 1. When an external force is applied to the slide block 2, the locking element 73 locks the lumbar support 2. The fixing part 73 can be disengaged from or move relative to the positioning part 13, thereby adjusting the height of the slide 2 on the support plate 1, and further adjusting the height of the backrest 3 or lumbar support 4 on the support plate 1. In this structure, the backrest 3 and lumbar support 4 can slide relative to the support plate 1 through two sets of slides 2, which makes it convenient for users to adjust the height of the backrest 3 and lumbar support 4 as needed. The structure is simple and convenient for users to flexibly adjust and use the lumbar support. In addition, in this structure, the two sets of slides 2 are fixed relative to the support plate 1 through the first elastic member 72 and the locking member 73, and the external force applied to the slides 2 can adjust the height of the slides 2 on the support plate 1, which is convenient for users to adjust quickly and convenient for users to use.

[0044] In this embodiment, the guide rail 11 has an L-shaped or T-shaped cross section, and the slide block 2 is provided with a guide groove 21 that is adapted to the guide rail 11. The L-shaped or T-shaped guide groove 21 is conducive to the stable installation of the slide block 2 and the support plate 1. The structure is simple and convenient for the stable adjustment of the slide block 2.

[0045] In this utility model, the locking device 7 is an integral structure. The locking device 7 includes a fixed base 71, a first elastic element 72 and a locking element 73 are both disposed in the fixed base 71, and the first elastic element 72 drives the locking element 73 to pass through the fixed base 71 and cooperate with the positioning part 13. A plurality of positioning parts 13 are provided at intervals on the support plate, and the positioning parts 13 are provided at intervals along the extension direction of the guide rail 11.

[0046] Preferably, the slide 2 is provided with at least two sets of guide grooves 21, and the support plate 1 is provided with guide rails 11 that are adapted to each guide groove 21. At least two sets of guide grooves 21 and guide rails 11 are conducive to the stable installation of the slide 2, and prevent the backrest 3 and waist support 4 from tilting and swinging to both sides of the support plate 1 during use. This is conducive to the stable support of the backrest 3 and waist support 4 for the user. In the attached drawings of this utility model, the slide 2 is provided with two sets of guide grooves 21, and the support plate 1 is provided with two sets of guide rails 11.

[0047] The support plate 1 is provided with a stop block 12, which is located between the two sets of slides 2. The stop block 12 can limit the range of motion of the slides 2, thereby avoiding interference or collision between the backrest 3 and the lumbar support 4. The setting of the stop block 12 helps to avoid interference or collision between the backrest 3 and the lumbar support 4, and makes it convenient for users to adjust the backrest 3 and the lumbar support 4, and avoids the backrest 3 and the lumbar support 4 being too high or too low during use.

[0048] In this utility model, two sets of slide blocks 2 can be slidably connected to the same guide rail 11, or the two sets of slide blocks 2 can be slidably connected to two sets of guide rails 11 respectively. In the attached drawings of this utility model, the support plate 1 is provided with two sets of guide rails 11, and the two sets of slide blocks 2 are slidably connected to the two sets of guide rails 11. The stop block 12 is connected to the middle of the two sets of guide rails 11 and divides the guide rails 11 into upper and lower parts. The two sets of slide blocks 2 are slidably connected to the upper and lower parts of the guide rails 11 respectively. The guide rails 11 are provided with fixing holes 111 at both ends. The fasteners 51 can be installed in the fixing holes 111 and prevent the slide blocks 2 from detaching from the guide rails 11.

[0049] In this invention, the support plate 1 has two horizontally distributed backrests 3 on its front side. The slide 2 includes a first slide 2 for mounting the backrests 3. The first slide 2 has a longitudinally extending hinge shaft 8. The backrests 3 are rotatably mounted on the first slide 2 via the hinge shaft 8. The backrests 3 can be flipped toward the center of the support plate 1 via the hinge shaft 8. A second elastic element 9 is provided between the first slide 2 and the backrests 3. The second elastic element 9 can drive the backrests 3 to flip toward the side of the support plate 1. The two horizontally distributed backrests 3 facilitate stable support of the lumbar support for the user's back. Since the backrests 3 can be flipped toward the center of the support plate 1 via the hinge shaft 8, when the user's back is against the backrests, the backrests 3 can be flipped toward the center of the support plate 1 and rest against both sides of the back, which is beneficial for the lumbar support to support the user's back and improves the comfort of the lumbar support.

[0050] Two laterally distributed lumbar supports 4 are provided on the front side of the support plate 1. The slide 2 includes a second slide 2 for mounting the lumbar supports 4. The second slide 2 is provided with a longitudinally extending hinge shaft 8. The lumbar supports 4 are rotatably mounted on the second slide 2 through the hinge shaft 8. The lumbar supports 4 can be flipped toward the center of the support plate 1 through the hinge shaft 8. A second elastic element 9 is provided between the second slide 2 and the backrest 3. The second elastic element 9 can drive the backrest 3 to flip toward the side of the support plate 1. The two laterally distributed lumbar supports 4 facilitate stable support of the user's waist. Since the lumbar supports 4 can be flipped toward the center of the support plate 1 through the hinge shaft 8, when the user's waist is against the lumbar supports 4, the lumbar supports 4 can be flipped toward the center of the support plate 1 and against both sides of the waist, which is beneficial for the lumbar support to support the user's waist and improves the comfort of the lumbar support.

[0051] Preferably, the second elastic element 9 is a torsion spring, which includes an elastic part 91 and two drive arms 92. The elastic part 91 is sleeved on the hinge shaft 8, and the slide 2 is provided with a first positioning groove 24. The backrest 3 and the lumbar support 4 are both provided with second positioning grooves 322. The two drive arms 92 of the torsion spring are respectively installed in the first positioning groove 24 and the second positioning groove 322. In this structure, the elastic part 91 is sleeved on the hinge shaft 8, and the drive arms 92 are respectively installed in the first positioning groove 24 and the second positioning groove 322, which is conducive to the stable installation of the second elastic element 9 and facilitates the assembly and production of the lumbar support.

[0052] The slide block 2 described in this utility model is provided with a hinge groove 22, and mounting holes 23 are provided on both sides of the hinge groove 22. The backrest 3 and the waist support 4 are each provided with a hinge seat 32 adapted to the hinge groove 22. The hinge seat 32 is rotatably mounted in the hinge groove 22 via a hinge shaft 8. The hinge shaft 8 includes a hinge rod 81, one end of which is provided with a limiting part 82, and the other end of which is provided with an elastic hook 83. The limiting part 82 abuts against the mounting hole 23 end on one side of the hinge groove 22. The elastic hook 83 abuts against the end of the mounting hole 23 on the other side of the hinge groove 22. Under the action of external force, the elastic hook 83 can deform and pass through the mounting hole 23 and the hinge groove 22. The hinge groove 22 facilitates the positioning and installation of the backrest 3 and the lumbar support 4 along the slide 2. Furthermore, since the hinge shaft 8 is provided with the elastic hook 83, it is convenient to quickly fix and install the hinge shaft 8, preventing the hinge shaft 8 from detaching from the slide 2 during the use of the lumbar support, which is beneficial to the stable installation of the backrest 3 and the lumbar support 4.

[0053] In this embodiment, the elastic part 91 is disposed in the hinge groove 22, the hinge seat 32 is provided with a hinge protrusion 321, the hinge shaft 8 passes through the mounting hole 23 and through the hinge protrusion 321 and the elastic part 91, and preferably the elastic hook 83 is provided with a guide surface 84, the guide surface 84 can abut against the mounting hole 23 or other objects and drive the elastic hook 83 to deform, so that the elastic hook 83 can quickly pass through the mounting hole 23, the elastic part 91 and the hinge protrusion 321.

[0054] In this utility model, the backrest 3 and lumbar support 4 have similar structures, the main difference being the shape of each component. Although only the structure of the backrest is shown in the accompanying drawings, those skilled in the art can understand the structure of the lumbar support from this. The backrest 3 in the accompanying drawings includes a hinge seat 32, a support plate 31, and a flexible pad 33. The flexible pad 33 is fixed to the support plate 31 by a fixing buckle 34. A positioning protrusion 311 is provided on the side of the support plate 31 away from the flexible pad 33. The hinge seat 32 is provided with a groove 323 that matches the positioning protrusion 311. In this embodiment, the flexible pad 33 has honeycomb-shaped deformable holes.

[0055] The lower end of the support plate 1 is provided with a hinge groove 22. A seat plate 6 or a protective sleeve 5 is detachably installed on the hinge groove 22 by means of fasteners 51. The protective sleeve 5 can prevent foreign objects from entering the hinge groove 22. In this structure, the seat plate 6 or the protective sleeve 5 is installed on the hinge part 14 by means of fasteners 51, which makes it convenient for users to use the lumbar support flexibly. When the user does not need to install the seat plate 6 on the support plate 1, the protective sleeve 5 can protect the hinge part 14 to prevent damage to the hinge part 14 or foreign objects from entering the hinge part 14.

[0056] A seat plate 6 is rotatably mounted on the hinge portion 14. The support plate 1 can be flipped and folded toward the seat plate 6, and the seat plate 6 extends toward the rear and upper side of the hinge portion 14 to form a limiting wall 62. The seat plate 6 can abut against the limiting wall 62 and limit the maximum rotation angle between the seat plate 6 and the support plate 1. The hinge portion 14 allows the user to install the seat plate 6 below the support plate 1 as needed, which facilitates the installation and use of the lumbar support. The limiting wall 62 facilitates the stable unfolding of the seat plate 6 and the support plate 1, making it convenient for the user. Preferably, the seat plate 6 is provided with a connecting portion 61 that is adapted to the hinge portion 14, and the support plate 1 is provided with a storage groove 15 for storing the limiting wall 62.

[0057] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A lumbar support, comprising a support plate (1), wherein a backrest (3) and a lumbar support (4) are movably disposed on the support plate (1), characterized in that: The support plate (1) is provided with a longitudinally extending guide rail (11), and two sets of slide seats (2) are slidably arranged on the guide rail (11). The backrest (3) and waist support (4) are respectively arranged on the two sets of slide seats (2), and both sets of slide seats (2) are provided with a locking device (7). The locking device (7) includes a first elastic element (72) and a locking element (73). The support plate (1) is provided with a positioning part (13) adapted to the locking element (73). The first elastic element (72) can drive the locking element (73) to cooperate with different positioning parts (13) or cooperate with different positions of the positioning parts (13), so that the slide seat (2) and the support plate (1) are relatively fixed. When an external force is applied to the slide (2), the locking member (73) can disengage from the positioning part (13) or move relative to the positioning part (13), thereby adjusting the height of the slide (2) on the support plate (1), and further adjusting the height of the backrest (3) or waist support (4) on the support plate (1).

2. A lumbar support according to claim 1, characterized in that: The support plate (1) has two horizontally distributed backing plates (3) on its front side. The slide (2) includes a first slide (2) for mounting the backing plates (3). The first slide (2) is provided with a longitudinally extending hinge shaft (8). The backing plates (3) are rotatably mounted on the first slide (2) via the hinge shaft (8). The backing plates (3) can be flipped toward the center of the support plate (1) via the hinge shaft (8). A second elastic element (9) is provided between the first slide (2) and the backing plates (3). The second elastic element (9) can drive the backing plates (3) to flip toward the side of the support plate (1).

3. A lumbar support according to claim 1, characterized in that: The front side of the support plate (1) is provided with two horizontally distributed lumbar supports (4). The slide (2) includes a second slide (2) for mounting the lumbar supports (4). The second slide (2) is provided with a longitudinally extending hinge shaft (8). The lumbar supports (4) are rotatably mounted on the second slide (2) through the hinge shaft (8). The lumbar supports (4) can be flipped toward the middle of the support plate (1) through the hinge shaft (8). A second elastic element (9) is provided between the second slide (2) and the backrest (3). The second elastic element (9) can drive the backrest (3) to flip toward the side of the support plate (1).

4. A lumbar support according to claim 2 or 3, characterized in that: The second elastic element (9) is a torsion spring, which includes an elastic part (91). Two drive arms (92) are provided on the elastic part (91). The elastic part (91) is sleeved on the hinge shaft (8). A first positioning groove (24) is provided on the slide (2). A second positioning groove (322) is provided on the back plate (3) and the waist support (4). The two drive arms (92) of the torsion spring are respectively installed in the first positioning groove (24) and the second positioning groove (322).

5. A lumbar support according to claim 4, characterized in that: The slide (2) is provided with a hinge groove (22), and mounting holes (23) are provided on both sides of the hinge groove (22). The backrest (3) and the waist support (4) are provided with hinge seats (32) that are adapted to the hinge groove (22). The hinge seat (32) is rotatably mounted in the hinge groove (22) through the hinge shaft (8). The hinge shaft (8) includes a hinge rod (81). One end of the hinge rod (81) is provided with a limiting part (82), and the other end of the hinge rod (81) is provided with an elastic hook (83). The limiting part (82) abuts against the end of the mounting hole (23) on one side of the hinge groove (22), and the elastic hook (83) abuts against the end of the mounting hole (23) on the other side of the hinge groove (22). Under the action of external force, the elastic hook (83) can deform and pass through the mounting hole (23) and the hinge groove (22).

6. A lumbar support according to claim 1, 2, 3, or 5, characterized in that: The cross-section of the guide rail (11) is L-shaped or T-shaped, and the slide (2) is provided with a guide groove (21) that is adapted to the guide rail (11).

7. A lumbar support according to claim 6, characterized in that: The slide (2) is provided with at least two sets of guide grooves (21), and the support plate (1) is provided with guide rails (11) that are adapted to each guide groove (21).

8. A lumbar support according to claim 1, 2, 3, 5, or 7, characterized in that: The support plate (1) is provided with a stop (12), which is located between the two sets of slides (2). The stop (12) can limit the range of motion of the slides (2), thereby avoiding interference or collision between the backrest (3) and the waist support (4).

9. A lumbar support according to claim 1, 2, 3, 5, or 7, characterized in that: The lower end of the support plate (1) is provided with a hinge part (14), and a seat plate (6) is rotatably provided on the hinge part (14). The support plate (1) can be flipped and folded toward the seat plate (6), and the seat plate (6) extends toward the rear side and upper side of the hinge part (14) to form a limiting wall (62). The seat plate (6) can abut against the limiting wall (62) and limit the maximum rotation angle between the seat plate (6) and the support plate (1).

10. A lumbar support according to claim 1, 2, 3, 5, or 7, characterized in that: The lower end of the support plate (1) is provided with a hinge part (14). A seat plate (6) or a protective sleeve (5) is detachably provided on the hinge part (14) by means of fasteners (51). The protective sleeve (5) can prevent foreign objects from entering the hinge part (14).

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