Chair with adjustable waist rest

Abstract

The utility model belongs to the technical field of seats, and particularly relates to a chair with an adjustable waist rest, which comprises a chair seat, a support main body arranged on the chair seat and the waist rest with the upper end connected to the support main body, a sliding block is arranged at the lower end of the waist rest, the sliding block is vertically arranged on the support main body in a sliding manner, a limiting component is arranged between the sliding block and the support main body, and the limiting component is arranged on the support main body. The limiting assembly comprises a blocking plate arranged on the supporting body and a blocking rod arranged on the sliding block, a swing rod is arranged in the sliding block, the upper end of the swing rod is rotationally connected to the sliding block, the blocking rod is arranged at the lower end of the swing rod, springs are arranged between the left side and the right side of the blocking rod and the side wall of the sliding block respectively, and limiting columns are arranged on the left side and the right side of the blocking rod respectively. Limiting blocks are arranged on the left side wall and the right side wall of the sliding block respectively, limiting grooves are formed in the limiting blocks, the corresponding limiting columns are sleeved with one ends of springs, and the other ends of the springs are arranged in the limiting grooves. The swing rod is always in the middle position, and the adjustment of the waist rest is not easy to fail.

Description

Technical fields:

[0001] This utility model belongs to the field of seating technology, specifically referring to a chair with adjustable lumbar support. Background technology:

[0002] Chinese utility model patent (publication number CN215604380U, application date 2021.08.17, publication date 2022.01.25) discloses a lumbar support adjustment structure for an office chair, including a support body and a lumbar support portion. The support body is provided with a main support rod; the lumbar support portion is provided with an upper end and a lower end. The upper end is fixed to the upper part of the main support rod, and the lower end is slidably mounted on the lower part of the main support rod. During the movement of the lower end towards the upper end, the lumbar support portion bends to provide support for the waist. A slide plate is mounted on the main support rod, and a slider is slidably mounted on the slide plate. The slider is connected to the lower end. A stop plate is provided on the slide plate, and stops are arranged longitudinally on the stop plate. The stops are obliquely upward and open. A slide seat is installed inside the slider, and a stop rod is provided on the slide seat. The stop rod is engaged in the stop. The slider has a recess, into which the slide block is slidably inserted. The slide block slides left and right within the recess, and springs are installed between the left and right sides of the slide block and the inner wall of the recess. The lumbar support is fishbone shaped and includes a central ridge and supporting side plates. The top of the central ridge forms the upper end, and the bottom of the central ridge forms the lower end. The supporting side plates are arranged on the left and right sides of the central ridge.

[0003] The drawback of the lumbar support adjustment structure for the office chair mentioned above is that the installation positions of the two springs on both sides of the slide are difficult to keep consistent, which leads to different forces on both sides of the slide, resulting in the slide not being able to return to the middle position and the lumbar support not being adjustable. Summary of the Invention:

[0004] The purpose of this invention is to provide a chair with an adjustable lumbar support, whose swing arm is always in the middle position, and the adjustment of the lumbar support is less prone to failure.

[0005] This utility model is implemented as follows:

[0006] A chair with adjustable lumbar support includes a seat, a support body mounted on the seat, and a lumbar support connected to the support body at its upper end. The lower end of the lumbar support has a slider that slides vertically on the support body. A limiting component is provided between the slider and the support body. The limiting component includes a stop plate mounted on the support body and a stop bar mounted on the slider. A rocker arm is provided inside the slider, with its upper end rotatably connected to the slider and its lower end having the stop bar. Springs are respectively provided between the left and right sides of the stop bar and the side walls of the slider. Limiting posts are respectively provided on the left and right sides of the stop bar. Limiting blocks are respectively provided on the left and right side walls of the slider, each with a limiting groove. One end of the spring is fitted onto the corresponding limiting post, and the other end is located within the limiting groove.

[0007] In the aforementioned adjustable lumbar support chair, the lumbar support is elastic and can bend elastically. As the lower end of the lumbar support moves upward, it bends to provide support for the lower back. By controlling the upward movement distance of the lower end of the lumbar support, the degree of bending of the lumbar support can be adjusted accordingly, and the degree of protrusion of the lumbar support can be controlled.

[0008] In the aforementioned adjustable lumbar support chair, the lumbar support is made of elastic plastic, such as PP (polypropylene), PE (polyethylene), or nylon.

[0009] In the aforementioned adjustable lumbar chair, the left and right sides of the swing arm are respectively provided with grooves, and the limiting post is set in the corresponding groove.

[0010] In the aforementioned adjustable lumbar chair, the outer end of the limiting post protrudes from the side wall of the swing arm.

[0011] In the aforementioned adjustable lumbar chair, the limiting post gradually tilts upward from the end of the connecting rod to the outer end, and the opening of the limiting groove faces diagonally downward.

[0012] In the aforementioned adjustable lumbar support chair, the slider includes a hollow block with an opening and a baffle that limits the swing arm within the block. The swing arm and spring are disposed within the block, and the baffle has an arc-shaped groove for the baffle to extend out.

[0013] In the aforementioned adjustable lumbar support chair, the baffle is fixed to the block by screws.

[0014] In the aforementioned adjustable lumbar chair, a rotating shaft is provided on the side of the upper end of the swing arm away from the baffle, and a rotating hole adapted to the rotating shaft is provided in the block. The swing arm is rotatably connected to the block through the rotating shaft and the rotating hole.

[0015] In the aforementioned adjustable lumbar chair, a positioning post is provided on the upper end of the swing arm near the baffle, and the baffle is provided with a positioning hole that matches the positioning post.

[0016] In the aforementioned adjustable lumbar support chair, the stop plate includes multiple stop strips arranged vertically at intervals and a connecting strip connecting two adjacent stop strips. The stop strips are inclined, and the connecting strip is located at the lower end of the stop strips. A stop groove is formed between two adjacent stop strips. Two limiting plates are arranged vertically parallel on the upper part of the support body. The stop plate is located between the two limiting plates, and an upward channel for the stop rod to slide is formed between the stop plate and one of the limiting plates. A downward channel for the stop rod to slide is formed between the stop plate and the other limiting plate. An upper limit strip for upper limit of the stop rod and a lower limit strip for lower limit of the stop rod are also provided between the two limiting plates. The stop plate is located between the upper limit strip and the lower limit strip.

[0017] In the aforementioned adjustable lumbar support chair, the slider is provided with a sliding plate on both the left and right sides, and the support body is fixed with a mounting plate by screws. The sliding plate is limited between the mounting plate and the support body, and a slide is formed between the mounting plate and the support body for the sliding plate to slide vertically.

[0018] In the aforementioned adjustable lumbar support chair, the supporting body is provided with an upper connecting block, and the slider is provided with a lower connecting block on the side away from the supporting body. The upper end of the lumbar support is hinged to the upper connecting block, and the lower end is hinged to the lower connecting block.

[0019] In the aforementioned adjustable lumbar support chair, the lumbar support is fishbone shaped and includes a central ridge and supporting side panels. The upper end of the central ridge is hinged to an upper connecting block, and the lower end is hinged to a lower connecting block.

[0020] In the aforementioned adjustable lumbar support chair, the upper end of the central spine is hinged to the upper connecting block: there are two upper connecting blocks, located on both sides of the central spine respectively, and the shank of the bolt passes through one of the upper connecting blocks, the upper end of the central spine, and the other upper connecting block and is screwed to the nut.

[0021] In the aforementioned adjustable lumbar support chair, the lower end of the central spine is hinged to the lower connecting block: the lower end of the central spine is provided with an installation groove that matches the lower connecting block, and the shank of the bolt passes through one side wall of the central spine, the lower connecting block, and the other side wall of the central spine and is screwed to the nut.

[0022] In the aforementioned adjustable lumbar chair, the upper end of the slider is provided with an adjustment rod. The adjustment rod includes a horizontally arranged rod body and handle portions arranged at both ends of the rod body. The handle portions are spherical, and the diameter of the handle portions is larger than the diameter of the rod body.

[0023] In the aforementioned adjustable lumbar support chair, the two ends of the handle are cut into flat surfaces, and the end of the handle near the rod is provided with a conical part. The diameter of the conical part gradually decreases from the handle to the rod, and the conical part and the rod are transitioned by a concave arc surface.

[0024] In the aforementioned adjustable lumbar support chair, the handle portion is coaxially arranged with the rod body, and multiple recesses are evenly distributed circumferentially along the circumferential direction of the rod body on the handle portion.

[0025] In the aforementioned adjustable lumbar support chair, the support body includes a frame body mounted on the seat. The frame body has an upper connecting part and a lower connecting part. The upper connecting part is V-shaped and its two ends are respectively connected to the frame body. The upper end of the lumbar support is connected to the middle of the upper connecting part. The lower connecting part is a strip-shaped part arranged vertically along its length, and its width in the middle is greater than the width at the top and bottom ends. A stop plate is mounted on the lower connecting part, and a slider slides vertically on the lower connecting part. Reinforcing ribs are provided on the left and right sides of the lower connecting part. One end of the reinforcing rib is connected to the middle of the lower connecting part, and the other end is connected to the frame body. The frame body is covered with a mesh fabric.

[0026] In the aforementioned adjustable lumbar support chair, the upper connecting part, the lower connecting part, and the frame body are an integral structure.

[0027] In the aforementioned adjustable lumbar support chair, the upper connecting block is located in the middle of the upper connecting part and is an integral structure with the upper connecting part; the slider and the lower connecting block are an integral structure.

[0028] In the aforementioned adjustable lumbar support chair, the stop plate, limit plate, upper limit strip, lower limit strip, and lower connecting part are an integral structure.

[0029] The outstanding advantages of this utility model compared to the prior art are:

[0030] 1. The upper end of the swing arm of this utility model is rotatably connected to the slider to position the upper end of the slider, which facilitates the installation of the spring; at the same time, the left and right sides of the stop rod are respectively provided with limiting posts, and the left and right side walls of the slider are respectively provided with limiting blocks. The limiting blocks are provided with limiting grooves. One end of the spring is limited by the limiting post and the other end is limited by the limiting groove. The installation positions of the springs on both sides are consistent, that is, the force on both sides of the swing arm is the same, the swing arm is always in the middle position, and the adjustment of the waist support is not prone to failure.

[0031] 2. The left and right sides of the swing arm of this utility model are respectively provided with grooves, and the limiting post is set in the corresponding groove. While ensuring the strength of the swing arm, the distance between the swing arm and the side walls of the slider is minimized as much as possible, thereby reducing the width of the slider, effectively reducing the volume of the slider, and saving materials.

[0032] 3. The slider of this utility model includes a hollow block with an opening and a baffle that limits the rocker arm within the block. The rocker arm and spring are disposed in the block. The baffle is provided with an arc-shaped groove for the extension of the baffle arm. The arc-shaped groove guides the movement of the baffle arm. The baffle arm, spring and block are integrated into a whole, which facilitates the installation of the slider on the support body. Attached image description:

[0033] Figure 1 This is a perspective view of the present invention;

[0034] Figure 2 This is a three-dimensional view of the meshless design of this utility model;

[0035] Figure 3 This is an exploded view of the support body, lumbar support, and limiting components of this utility model;

[0036] Figure 4 This is a perspective view of the block, the swing arm, and the adjusting rod of this utility model;

[0037] Figure 5 This is a perspective view of the slider, rocker arm, and adjusting rod of this utility model;

[0038] Figure 6 This is a perspective view of the slider and adjusting rod of this utility model;

[0039] Figure 7 This is a perspective view of the swing arm of this utility model;

[0040] Figure 8 This is a three-dimensional view of the supporting body of this utility model.

[0041] Reference numerals: 1. Seat; 2. Support body; 2a. Frame body; 2b. Upper connecting part; 2c. Lower connecting part; 2d. Reinforcing rib; 3. Lumbar support; 3a. Central spine; 3b. Supporting side panel; 4. Slider; 4a. Block; 4b. Baffle; 4c. Slide plate; 5. Stop plate; 5a. Stop bar; 5b. Connecting bar; 5c. Stop groove; 6. Stop bar; 7. Swing bar; 8. Limiting post; 9. Limiting block; 10. Limiting groove ; 11. Groove; 12. Arc groove; 13. Limiting plate; 14. Upward channel; 15. Downward channel; 16. Upper limit bar; 17. Lower limit bar; 18. Upper connecting block; 19. Lower connecting block; 20. Adjusting rod; 20a. Rod body; 20b. Handle part; 20c. Conical part; 20d. Recess; 21. Mesh cloth; 22. Mounting plate; 23. Rotating shaft; 24. Rotating hole; 25. Positioning post; 26. Positioning hole. Detailed implementation method:

[0042] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —8:

[0043] A chair with adjustable lumbar support includes a seat 1, a support body 2 mounted on the seat 1, and a lumbar support 3 connected to the support body 2 at its upper end. The lower end of the lumbar support 3 is provided with a slider 4, which slides vertically on the support body 2. A limiting assembly is provided between the slider 4 and the support body 2. The limiting assembly includes a stop plate 5 mounted on the support body 2 and a stop rod 6 mounted on the slider 4. A swing rod 7 is provided inside the slider 4, with its upper end rotatably connected to the slider 4 and its lower end provided with the stop rod 6. Springs are provided between the left and right sides of the stop rod 6 and the side walls of the slider 4. Limiting posts 8 are provided on the left and right sides of the stop rod 6. Limiting blocks 9 are provided on the left and right side walls of the slider 4, and limiting grooves 10 are provided on the limiting blocks 9. One end of each spring is fitted onto a corresponding limiting post 8, and the other end is located within the limiting groove 10.

[0044] like Figure 1-8 As shown, the upper end of the swing arm 7 of this utility model is rotatably connected to the slider 4 to position the upper end of the slider 4, which facilitates the installation of the spring. At the same time, the left and right sides of the stop rod 6 are respectively provided with limiting posts 8, and the left and right side walls of the slider 4 are respectively provided with limiting blocks 9. The limiting blocks 9 are provided with limiting grooves 10. One end of the spring is limited by the limiting post 8 and the other end is limited by the limiting groove 10. The installation positions of the springs on both sides are consistent, that is, the force on both sides of the swing arm 7 is the same, the swing arm 7 is always in the middle position, and the adjustment of the waist support 3 is not prone to failure.

[0045] Furthermore, the lumbar support 3 is elastic and can bend elastically. During the upward movement of the lower end of the lumbar support 3, the lumbar support 3 bends to provide support for the waist. By controlling the upward movement distance of the lower end of the lumbar support 3, the degree of bending of the lumbar support 3 can be adjusted accordingly, and the degree of protrusion of the lumbar support 3 can be controlled, which can adapt to the needs of different people and improve the comfort of using the chair.

[0046] Preferably, the lumbar support 3 is made of elastic plastic, such as PP (polypropylene), PE (polyethylene), or nylon. In this embodiment, the lumbar support 3 is made of PP (polypropylene).

[0047] To minimize the distance between the rocker arm 7 and the side walls of the slider 4 while ensuring the strength of the rocker arm 7, thereby reducing the width of the slider 4, effectively reducing its volume, and saving materials, such as... Figure 4 , 7 As shown, the left and right sides of the swing arm 7 are respectively provided with grooves 11, and the limiting post 8 is set in the corresponding groove 11.

[0048] To better limit the spring, the outer end of the limiting post 8 protrudes from the side wall of the rocker arm 7.

[0049] To further reduce the distance between the rocker arm 7 and the two side walls of the slider 4, and thus reduce the width of the slider 4, as follows: Figure 4 , 6 As shown, the limiting post 8 gradually tilts upward from the end of the connecting rod 7 to the outer end, and the opening of the limiting groove 10 faces downward, so that the spring force can be better applied to the rod 7.

[0050] The structure of slider 4: as follows Figure 3-6 As shown, the slider 4 includes a hollow block 4a with an opening and a baffle 4b that confines the rocker arm 7 within the block 4a. The rocker arm 7 and the spring are disposed within the block 4a. The baffle 4b has an arc-shaped groove 12 for the extension rod 6, which guides the movement of the extension rod 6. This invention integrates the rocker arm 7, the spring, and the block 4a into a single unit using the baffle 4b, facilitating the mounting of the slider 4 onto the support body 2.

[0051] Installation structure of baffle 4b: The baffle 4b is fixed to the block 4a by screws.

[0052] Rotational structure of the swing rod 7 and the block 4a: The upper end of the swing rod 7 is provided with a rotating shaft 23 on the side away from the baffle 4b, and the block 4a is provided with a rotating hole 24 that is adapted to the rotating shaft 23. The swing rod 7 is rotatably connected to the block 4a through the rotating shaft 23 and the rotating hole 24.

[0053] Furthermore, a positioning post 25 is provided on the upper end of the swing rod 7 near the baffle 4b, and a positioning hole 26 adapted to the positioning post 25 is provided on the baffle 4b.

[0054] The specific structure of the stop plate 5 is as follows: Figure 8 As shown, the stop plate 5 includes multiple stop bars 5a arranged vertically at intervals, and a connecting bar 5b connecting two adjacent stop bars 5a. The stop bars 5a are inclined, and the connecting bar 5b is located at the lower end of the stop bars 5a. A stop groove 5c is formed between two adjacent stop bars 5a. Two limiting plates 13 are arranged vertically parallel on the support body 2. The stop plate 5 is located between the two limiting plates 13, and an upward channel 14 for the stop rod 6 to slide is formed between the stop plate 5 and one of the limiting plates 13. A downward channel 15 for the stop rod 6 to slide is formed between the stop plate 5 and the other limiting plate 13. An upper limit bar 16 for the upper limit of the stop rod 6 and a lower limit bar 17 for the lower limit of the stop rod 6 are also provided between the two limiting plates 13. The stop plate 5 is located between the upper limit bar 16 and the lower limit bar 17.

[0055] When the stop lever 6 moves within the upward channel 14, the spring force causes it to engage in one of the gear slots 5c, and the slider 4 is fixed relative to the supporting body 2, i.e., the lower end of the backrest 3 is fixed. When the gear needs to be adjusted, the slider 4 is pulled upward, and the stop lever 6 moves upward along the gear slot 5c to the upward channel 14. The slider 4 continues to move upward, and then, under the action of the spring force, the stop lever 6 engages in the previous gear slot 5c. When the stop lever 6 leaves the uppermost gear slot 5c, under the action of the spring force, the stop lever 6 enters above the uppermost gear bar 5a. At this time, the slider 4 is moved downward, and the stop lever 6 enters the downward channel 15 along the upper guide slope of the uppermost gear bar 5a. Then, the slider 4 is moved downward, and the stop lever 6 moves down along the downward channel 15 to the bottom. Under the action of the spring force, the stop lever 6 moves to below the lowermost gear bar 5a. Then, the slider 4 is moved upward, and the stop lever 6 enters the upward channel 15 along the lower guide slope of the lowermost gear bar 5a. This utility model achieves different degrees of bending of the lumbar support 3 by having the stop bar 6 inserted into different stop slots 5c.

[0056] The slider 4 is vertically slidable on the support body 2. Slide plates 4c are provided on both the left and right sides of the slider 4. A mounting plate 22 is fixed to the support body 2 by screws. The slide plates 4c are positioned between the mounting plate 22 and the support body 2, forming a sliding track for the slide plates 4c to slide vertically. The mounting plate 22 ensures that the slider 4 is positioned on the support body 2.

[0057] The connection structure of the upper and lower ends of the lumbar support 3: The upper connecting block 18 is provided on the support body 2, and the lower connecting block 19 is provided on the side of the slider 4 away from the support body 2. The upper end of the lumbar support 3 is hinged to the upper connecting block 18, and the lower end is hinged to the lower connecting block 19.

[0058] The structure of the lumbar support 3: The lumbar support 3 is fishbone shaped, including a central ridge 3a and a supporting side plate 3b. The upper end of the central ridge 3a is hinged to the upper connecting block 18 and the lower end is hinged to the lower connecting block 19.

[0059] The upper end of the central ridge 3a is hinged to the upper connecting block 18: There are two upper connecting blocks 18, which are located on both sides of the central ridge 3a respectively. The shank of the bolt passes through one of the upper connecting blocks 18, the upper end of the central ridge 3a, and the other upper connecting block 18 and is screwed to the nut.

[0060] The lower end of the central ridge 3a is hinged to the lower connecting block 19: The lower end of the central ridge 3a is provided with an installation groove that is adapted to the lower connecting block 19. The shank of the bolt passes through one side wall of the central ridge 3a, the lower connecting block 19, and the other side wall of the central ridge 3a and is screwed to the nut.

[0061] To facilitate the upward and downward movement of the slider 4, an adjusting rod 20 is provided at the upper end of the slider 4. The adjusting rod 20 includes a horizontally arranged rod body 20a and handle portions 20b arranged at both ends of the rod body 20a. The handle portions 20b are spherical, and the diameter of the handle portions 20b is larger than the diameter of the rod body 20a.

[0062] Furthermore, the handle portion 20b is cut into planes at both ends, and a conical portion 20c is provided at the end of the handle portion 20b near the rod body 20a. The diameter of the conical portion 20c gradually decreases from the handle portion 20b to the rod body 20a, and the conical portion 20c and the rod body 20a are connected by a concave arc surface.

[0063] Preferably, the handle portion 20b is coaxially arranged with the rod body 20a, and a plurality of recesses 20d are evenly distributed on the handle portion 20b along the circumferential direction of the rod body 20a.

[0064] The specific structure of supporting body 2: as follows Figure 1-3 As shown in Figure 8, the supporting body 2 includes a frame body 2a disposed on the seat 1. The frame body 2a is provided with an upper connecting part 2b and a lower connecting part 2c. The upper connecting part 2b is V-shaped and its two ends are respectively connected to the frame body 2a. The upper end of the lumbar support 3 is connected to the middle of the upper connecting part 2b. The lower connecting part 2c is a strip-shaped part arranged vertically along its length, and its width in the middle is greater than the width at the upper and lower ends. The stop plate 5 is disposed on the lower connecting part 2c. The slider 4 slides vertically on the lower connecting part 2c. The left and right sides of the lower connecting part 2c are respectively provided with reinforcing ribs 2d. One end of the reinforcing rib 2d is connected to the middle of the lower connecting part 2c and the other end is connected to the frame body 2a. The frame body 2a is provided with a mesh fabric 21.

[0065] To ensure structural strength and reduce assembly steps, the upper connecting part 2b, the lower connecting part 2c, and the frame body 2a are integrated into one structure.

[0066] To ensure structural robustness and reduce assembly steps, the upper connecting block 18 is located in the middle of the upper connecting part 2b and is an integral part of the upper connecting part 2b; the slider 4 and the lower connecting block 19 are an integral part of the structure.

[0067] To ensure structural robustness and reduce assembly steps, the stop plate 5, limit plate 13, upper limit bar 16, lower limit bar 17, and lower connecting part 2c are integrated into a single structure.

[0068] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A chair with adjustable lumbar support, comprising a seat (1), a support body (2) disposed on the seat (1), and a lumbar support (3) connected at its upper end to the support body (2), wherein the lower end of the lumbar support (3) is provided with a slider (4), the slider (4) is slidably disposed vertically on the support body (2), and a limiting component is provided between the slider (4) and the support body (2), the limiting component comprising a stop plate (5) disposed on the support body (2) and a stop bar (6) disposed on the slider (4), characterized in that: The slider (4) is provided with a rocker arm (7), the upper end of which is rotatably connected to the upper part of the slider (4), and the lower end is provided with the stop rod (6). The left and right sides of the stop rod (6) are respectively provided with springs between them and the side walls of the slider (4). The left and right sides of the stop rod (6) are respectively provided with limiting posts (8). The left and right side walls of the slider (4) are respectively provided with limiting blocks (9). The limiting blocks (9) are provided with limiting grooves (10). One end of the spring is fitted onto the corresponding limiting post (8), and the other end is set in the limiting groove (10).

2. The adjustable lumbar support chair according to claim 1, characterized in that: The left and right sides of the swing arm (7) are respectively provided with grooves (11), and the limiting post (8) is set in the corresponding groove (11).

3. A chair with adjustable lumbar support according to claim 2, characterized in that: The outer end of the limiting post (8) protrudes from the side wall of the swing rod (7).

4. A chair with adjustable lumbar support according to claim 1, characterized in that: The limiting post (8) gradually tilts upward from the end of the connecting rod (7) to the outer end, and the opening of the limiting groove (10) faces downward.

5. A chair with adjustable lumbar support according to claim 1, characterized in that: The slider (4) includes a hollow block (4a) with an opening and a baffle (4b) that limits the rocker arm (7) within the block (4a). The rocker arm (7) and the spring are disposed within the block (4a). The baffle (4b) is provided with an arc-shaped groove (12) for the stop rod (6) to extend out.

6. A chair with adjustable lumbar support according to claim 1, characterized in that: The stop plate (5) includes multiple stop bars (5a) arranged vertically at intervals, and a connecting bar (5b) connecting two adjacent stop bars (5a). The stop bars (5a) are inclined, and the connecting bar (5b) is located at the lower end of the stop bars (5a). A stop groove (5c) is formed between two adjacent stop bars (5a). Two limiting plates (13) are arranged vertically parallel on the support body (2). The stop plate (5) is located between the two limiting plates (13), and the stop is positioned between them. An upward channel (14) for sliding of the stop bar (6) is formed between the plate (5) and one of the limiting plates (13), and a downward channel (15) for sliding of the stop bar (6) is formed between the stop plate (5) and the other limiting plate (13). An upper limit bar (16) for upper limit of the stop bar (6) and a lower limit bar (17) for lower limit of the stop bar (6) are also provided between the two limiting plates (13). The stop plate (5) is set between the upper limit bar (16) and the lower limit bar (17).

7. A chair with adjustable lumbar support according to claim 1, characterized in that: The support body (2) is provided with an upper connecting block (18), and the slider (4) is provided with a lower connecting block (19) on the side away from the support body (2). The upper end of the waist rest (3) is hinged to the upper connecting block (18), and the lower end is hinged to the lower connecting block (19).

8. A chair with adjustable lumbar support according to claim 1, characterized in that: The upper end of the slider (4) is provided with an adjusting rod (20). The adjusting rod (20) includes a horizontally arranged rod body (20a) and handle portions (20b) arranged at both ends of the rod body (20a). The handle portion (20b) is spherical, and the diameter of the handle portion (20b) is larger than the diameter of the rod body (20a).

9. A chair with adjustable lumbar support according to claim 1, characterized in that: The supporting body (2) includes a frame body (2a) set on the seat (1). The frame body (2a) is provided with an upper connecting part (2b) and a lower connecting part (2c). The upper connecting part (2b) is V-shaped and its two ends are respectively connected to the frame body (2a). The upper end of the lumbar support (3) is connected to the middle of the upper connecting part (2b). The lower connecting part (2c) is a strip set vertically along its length and its width in the middle is greater than the width at the upper and lower ends. The stop plate (5) is set on the lower connecting part (2c). The slider (4) slides vertically on the lower connecting part (2c). The lower connecting part (2c) is provided with reinforcing ribs (2d) on the left and right sides respectively. One end of the reinforcing rib (2d) is connected to the middle of the lower connecting part (2c) and the other end is connected to the frame body (2a). The frame body (2a) is provided with a mesh fabric (21).

Images