Seat with adjustable lumbar support

Abstract

This application discloses an adjustable lumbar support seat, including a backrest, a lumbar support body, and an adjustment device. The backrest includes a square backrest frame and a support portion horizontally disposed in the middle of the backrest frame. A first groove extending vertically is perforated in the support portion. A fabric cover is fitted onto the backrest frame, having front and back surfaces. An abutment is perforated on the back surface of the fabric cover opposite the first groove. The adjustment device passes through the first groove into the support portion. The front end of the adjustment device is connected to the lumbar support body, and the rear end of the adjustment device extends beyond the support portion and the abutment, thus protruding from the fabric cover. The adjustment device can slide up and down along the first groove, thereby causing the lumbar support body to slide up and down relative to the backrest. The adjustable lumbar support seat provided by this application allows for convenient adjustment of the lumbar support body height by moving the rear end of the adjustment device. Furthermore, only a portion of the adjustment device is exposed on the rear side of the fabric cover, resulting in a more aesthetically pleasing design.

Description

Technical Field

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

[0002] Chairs, with their excellent breathability and resilient support, have become a popular choice for office seating. The backrest typically consists of a back frame and a mesh fabric covering the front of the back frame. Since the mesh fabric alone cannot provide sufficient support for the user's lower back, prolonged sitting can easily lead to lumbar strain. Therefore, existing chairs often include a lumbar support on the back frame to assist in supporting the user's lower back. For example, one existing chair back support structure (application number: CN202121681890.9) has a support member installed on the back frame. A lumbar support slides onto the side of the support member facing the user. A limiting block is located on the side of the lumbar support facing the support member. Several grooves are vertically arranged on the side of the support member facing the lumbar support, each corresponding to a different limiting block. The limiting block can be detachably engaged in any of these grooves. This design not only provides lumbar support but also allows the user to freely adjust the height of the lumbar support according to their personal preferences.

[0003] However, in this type of chair back support structure, only the front side of the backrest frame is covered with mesh fabric, leaving the back of the backrest frame and the lumbar support exposed. This results in the chair not looking cohesive or simple enough, and lacking in aesthetic appeal.

[0004] To address the aforementioned problems, the inventors aim to provide a seat, as shown in the attached figure. Figure 1 and attached Figure 2 As shown, the entire chair back frame is covered by a sleeve-like fabric cover. The chair back frame and lumbar support are concealed within the cover, resulting in a well-integrated and aesthetically pleasing seat. However, with the back frame covered by the fabric cover, users cannot directly access and adjust the lumbar support inside the cover, making height adjustment of the lumbar support difficult.

[0005] Therefore, designing a chair with a fabric cover and adjustable lumbar support has become the main problem that needs to be solved. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a seat with adjustable lumbar support. By cutting out a relief opening on the fabric cover to avoid the rear end of the adjustment device, the user can adjust the height of the lumbar support body by turning the rear end of the adjustment device. The adjustment operation is convenient and practical. Moreover, only part of the adjustment device is exposed on the back of the fabric cover, so that the seat has a good overall appearance and a simple and elegant aesthetic.

[0007] The effect of this utility model is achieved as follows:

[0008] This application provides a seat with adjustable lumbar support, including a backrest, a lumbar support body, and an adjustment device. The backrest includes a square backrest frame and a support portion horizontally disposed in the middle of the backrest frame. The support portion has a first groove extending vertically through a cutout. A fabric cover is fitted onto the backrest frame, and the fabric cover has front and rear surfaces. An clearance opening is cut out on the rear surface of the fabric cover opposite the first groove. The adjustment device passes through the first groove and is inserted into the support portion. The front end of the adjustment device is connected to the lumbar support body, and the rear end of the adjustment device extends beyond the support portion and the clearance opening, so that the rear end of the adjustment device is exposed outside the fabric cover. The adjustment device can slide up and down along the first groove, thereby causing the lumbar support body to slide up and down relative to the backrest.

[0009] Furthermore, the adjustment device includes an adjustment member that engages within the first sliding groove and a connector that connects to the front side and the lumbar support body. A second sliding groove extending vertically is recessed on the front side of the support portion. The second sliding groove is a T-shaped groove. The connector is slidably connected to the chair back frame via the second sliding groove, and the connector and the support portion are relatively fixed in the horizontal direction. An opening is provided at the lower side of the second sliding groove. This ensures that the adjustment device and the support portion are relatively fixed in the horizontal direction, resulting in higher connection strength and better stability. Furthermore, the connector can be engaged from the opening at the lower side of the second sliding groove, simplifying the connection structure between the adjustment device and the support portion and facilitating installation and operation.

[0010] Furthermore, the adjustment device includes an adjustment member that is engaged with the first slide groove at the rear and a connecting member at the front. A cover plate is detachably connected to the front of the support. The cover plate has a third slide groove extending vertically through a perforation. The connecting member is clamped between the cover plate and the support. The connecting member includes a hinge at the front end for connecting with the lumbar support body. The hinge extends through the third slide groove and can slide up and down along the third slide groove. The connecting member is pressed tightly against the support by the cover plate, resulting in good stability and convenient installation and operation.

[0011] Furthermore, a decorative cover is detachably connected to the rear side of the support unit. A through hole is formed in the support unit, and a mounting part protrudes from the front end of the decorative cover. The mounting part is engaged with the support unit through the through hole, and a first sliding groove is formed in the mounting part. The fabric cover is held between the decorative cover and the support unit, and the decorative cover conceals the clearance opening. By concealing the clearance opening with the decorative cover, the integrity of the fabric cover's appearance is further enhanced, making the seat more aesthetically pleasing. Additionally, the connection strength between the decorative cover and the support unit is higher, resulting in better stability.

[0012] Furthermore, the adjustment device includes an adjustment component that snaps into the first slide groove and a connector that connects to the front side of the lumbar support body. The adjustment component and the connector are detachably connected by screws. This makes the assembly operation between the lumbar support body and the chair back frame very simple.

[0013] Furthermore, a gear adjustment mechanism is provided between the adjustment device and the support. This mechanism includes a locking member and several slots. The locking member is located in one of the adjustment device and the support, while the slots are located in the other. When the adjustment device slides up and down, the locking member engages sequentially with the slots, allowing the lumbar support to be suspended at a position where it stops sliding. This provides a tactile feedback during the height adjustment of the lumbar support and improves stability.

[0014] Furthermore, the adjustment device includes a connector that connects the front side and the backrest body, and a second sliding groove extending vertically is formed in the front recess of the support portion; a snap-fit ​​component is disposed on the side wall of the connector, and the groove wall of the second sliding groove is correspondingly recessed to form several snap-fit ​​slots. This not only realizes the adjustment of the gear position between the adjustment device and the support portion, but also allows the snap-fit ​​component to snap into the snap-fit ​​slots simultaneously when the connector is snapped into the lower opening of the second sliding groove, making the assembly operation relatively simple.

[0015] Furthermore, a deformation groove is formed on the side of the connector near the snap-fit ​​component. The side wall of the connector can contract inward with the help of the deformation groove to generate elastic deformation, thereby causing the snap-fit ​​component to retract inward. The elastic deformation of the connector causes the snap-fit ​​component to move between several slots. The structure is simple and makes the height adjustment of the lumbar support body very convenient.

[0016] Furthermore, the adjusting device includes an adjusting member that engages with the first sliding groove on its rear side. The engaging member is disposed on the adjusting member, and the groove wall of the first sliding groove is correspondingly recessed to form several slots. This not only realizes the adjustment of the gear position between the adjusting device and the support, but also allows the engaging member to engage with the slots when the adjusting member is inserted into the first sliding groove, making the assembly operation relatively simple.

[0017] Furthermore, the snap-fit ​​component has elastic deformation capability, and the front end of the adjusting component is recessed to form a second positioning groove. The snap-fit ​​component is snapped into the adjusting component through the second positioning groove, and its left and right sides protrude from the adjusting component. The snap-fit ​​component moves between several slots by its own elastic deformation. This facilitates the positioning operation between the connecting component and the adjusting component, and the snap-fit ​​component is pressed tightly against the second positioning groove by the second positioning protrusion, resulting in a higher connection strength between the snap-fit ​​component and the adjusting device.

[0018] The adjustable lumbar support seat provided in this application allows the lumbar support body to slide up and down driven by the adjustment device. The rear end of the adjustment device is avoided by a perforated opening on the fabric cover, meaning that the user can adjust the height of the lumbar support body by moving the rear end of the adjustment device. The adjustment operation is convenient and practical. Moreover, during the use of the seat, the support part and the lumbar support body are always wrapped inside the fabric cover and will not be exposed. Only part of the adjustment device is exposed on the back side of the fabric cover, which makes the seat have a good overall appearance and a simple and elegant aesthetic. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 A three-dimensional structural diagram of the seat provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the rear structure of the seat provided in an embodiment of this application;

[0022] Figure 3 A three-dimensional structural diagram of the chair back frame provided in an embodiment of this application;

[0023] Figure 4 A schematic diagram of the connection structure between the lumbar support body and the chair back frame provided in an embodiment of this application;

[0024] Figure 5 A schematic diagram of the connection structure between the connector and the second slide groove provided in an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the connection structure between the decorative panel and the fabric cover provided in an embodiment of this application;

[0026] Figure 7 This is a schematic diagram illustrating the change process of the adjustment device provided in the embodiments of this application;

[0027] Figure 8 A three-dimensional structural diagram of the connector provided in the embodiment of this application when it is pressed by the cover plate;

[0028] Figure 9 A schematic diagram of the connection structure between the connector, cover plate and chair back frame provided in an embodiment of this application;

[0029] Figure 10 This is a schematic diagram of the connection structure between the connector and the cover plate provided in an embodiment of this application;

[0030] Figure 11 A schematic diagram of the connection structure between the adjusting member and the decorative panel provided in an embodiment of this application;

[0031] Figure 12 This is a cross-sectional structural schematic diagram of the adjustment device provided in the embodiment of this application.

[0032] The attached figures are labeled as follows: 1-backrest frame, 101-slot, 110-support part, 111-second slide groove, 112-through hole, 113-fastener groove, 120-cover plate, 121-third slide groove, 130-decorative cover, 131-first slide groove, 132-installation part, 133-clover buckle, 2-lumbar support body, 3-fabric cover, 301-avoidance opening, 4-connector, 410-hinge part, 420-deformation groove, 430-first positioning groove, 440-second positioning protrusion, 5-adjusting part, 510-stop part, 520-first positioning protrusion, 530-second positioning groove, 6-snap fastener. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0034] Please refer to the attached document. Figure 1-12 This application provides an adjustable lumbar support seat, including a backrest, a lumbar support body 2, and an adjustment device. The backrest includes a square backrest frame 1 and a support portion 110 horizontally disposed in the middle of the backrest frame 1. The support portion 110 has a first groove 131 extending vertically through a cutout. A fabric cover 3 is fitted onto the backrest frame 1. The fabric cover 3 has front and back surfaces. The rear surface of the fabric cover 3 has a clearance opening 301 cutout at the part facing the first groove 131. The adjustment device passes through the first groove 131 and is inserted into the support portion 110. The front end of the adjustment device is connected to the lumbar support body 2, and the rear end of the adjustment device extends beyond the support portion 110 and the clearance opening 301, so that the rear end of the adjustment device is exposed outside the fabric cover 3. The adjustment device can slide up and down along the first groove 131, thereby causing the lumbar support body 2 to slide up and down relative to the backrest.

[0035] In this embodiment, the lumbar support body 2 is driven to slide up and down by the adjustment device, and the rear end of the adjustment device is avoided by the hollowed-out avoidance opening 301 on the cloth cover 3. That is, the user can adjust the height of the lumbar support body 2 by turning the rear end of the adjustment device. The adjustment operation is convenient and practical. Moreover, during the use of the seat, the support part 110 and the lumbar support body 2 are always wrapped inside the cloth cover 3 and will not be exposed. Only part of the adjustment device is exposed on the back side of the cloth cover 3, so that the seat has a good overall appearance and a simple and elegant aesthetic.

[0036] Preferably, the adjustment device includes a front connector 4, which includes a hinge 410. The lumbar support body 2 is hinged to the hinge 410, so that the lumbar support body 2 can be flipped up and down to adjust the tilt, thereby better fitting the user's back, which is more ergonomic and comfortable.

[0037] Please refer to the attached document. Figure 4-5 In some embodiments of this application, the adjustment device includes an adjustment member 5 that is snapped into the first slide groove 131 and a connector 4 that is connected to the front side and the lumbar support body 2. The front side of the support part 110 is recessed to form a second slide groove 111 that extends in the vertical direction. The second slide groove 111 is a T-shaped groove. The connector 4 is slidably connected to the backrest frame 1 through the second slide groove 111, and the connector 4 and the support part 110 are relatively fixed in the horizontal direction. The lower side of the second slide groove 111 is provided with an opening.

[0038] In this embodiment, by setting a T-shaped second slide groove 111, the adjusting device is relatively fixed to the support part 110 in the horizontal direction, resulting in higher connection strength and better stability. Furthermore, the connector 4 can be inserted from the opening on the lower side of the second slide groove 111, making the connection structure between the adjusting device and the support part 110 simple and convenient for installation and operation.

[0039] In this application, there may be other connection methods between the adjusting device and the support 110:

[0040] Please refer to the attached document. Figure 8-10 In some embodiments of this application, the adjustment device includes an adjustment member 5 that is snapped into the first slide groove 131 on the rear side and a connector 4 on the front side. The front side of the support part 110 is detachably connected to a cover plate 120. The cover plate 120 is hollowed out with a third slide groove 121 extending in the vertical direction. The connector 4 is clamped between the cover plate 120 and the support part 110. The connector 4 includes a hinge part 410 at the front end for connecting with the lumbar support body 2. The hinge part 410 extends out of the third slide groove 121 and can slide up and down along the third slide groove 121.

[0041] In this embodiment, preferably, the cover plate 120 is fixed to the chair back frame 1 by screw connection, and the connector 4 is pressed to the support part 110 by the cover plate 120, which has good stability and is very convenient to install.

[0042] Please refer to the attached document. Figure 2 and attached Figure 6 In some embodiments of this application, a decorative cover 130 is detachably connected to the rear side of the support portion 110. A through hole 112 is formed on the support portion 110. A mounting portion 132 is formed at the front end of the decorative cover 130. The mounting portion 132 is snapped onto the support portion 110 through the through hole 112. A first sliding groove 131 is formed on the mounting portion 132. The cloth cover 3 is clamped between the decorative cover 130 and the support portion 110. The decorative cover 130 covers the clearance opening 301.

[0043] In this embodiment, the decorative cover 130 covers the clearance opening 301, further enhancing the appearance integrity of the fabric cover 3 and improving the aesthetics of the seat. Furthermore, the decorative cover 130 is engaged with the through hole 112 on the support portion 110 via the mounting portion 132, resulting in a stronger and more stable connection between the decorative cover 130 and the support portion 110.

[0044] Preferably, the front side of the decorative cover 130 is fixedly connected with two upper and lower plum blossom buckles 133, and the support part 110 is correspondingly hollowed out to form two upper and lower buckle grooves 113. When the decorative cover 130 is installed on the support part 110, the plum blossom buckles 133 are inserted into the buckle grooves 113, thereby fixing the decorative cover 130 to the support part 110. The connection strength is high and the installation operation is relatively convenient.

[0045] Please refer to the attached document. Figure 7 In some embodiments of this application, the adjustment device includes an adjustment member 5 that is snapped into the first slide groove 131 and a connector 4 that is connected to the front side and the lumbar support body 2. The adjustment member 5 and the connector 4 are detachably connected by screws.

[0046] In this embodiment, the assembly steps of the seat are as follows: First, the connector 4 is installed on the front side of the support 110, and the lumbar support body 2 is hinged to the hinge part 410 on the front side of the connector 4. Then, a cloth cover 3 is placed on the backrest frame 1, covering the support 110 and the lumbar support body 2, with the clearance opening 301 aligned with the through hole 112 on the support 110. Next, the decorative cover 130 is fastened to cover the clearance opening 301, and the mounting part 132 of the decorative cover 130 is inserted into the through hole 112. The adjusting member 5 is inserted from the rear side of the first sliding groove 131, so that the adjusting member 5 aligns with the front connector 4. Finally, screws are tightened to connect and fix the lumbar support body 2, the support 110, the adjusting device, and the decorative cover 130. Thus, the assembly operation between the lumbar support body 2 and the backrest frame 1 is very simple.

[0047] Preferably, the adjusting member 5 extends vertically to form a stop portion 510. The stop portion 510 is close to the rear end of the decorative cover 130, which not only makes the connection between the adjusting member 5 and the decorative cover 130 stronger, but also makes the first sliding groove 131 on the decorative cover 130 covered by the stop portion 510, making the rear side of the seat more integrated and beautiful in appearance.

[0048] Please refer to the attached document. Figure 7 and attached Figure 12In some embodiments of this application, a gear adjustment mechanism is provided between the adjustment device and the support part 110. The gear adjustment mechanism includes a snap-fit ​​member 6 and several slots 101. The snap-fit ​​member 6 is disposed in one of the adjustment device and the support part 110, and the several slots 101 are formed in the other of the adjustment device and the support part 110. When the adjustment device slides up and down, the snap-fit ​​member 6 engages with the several slots 101 in sequence, so that the lumbar support body 2 can be suspended at the position where it stops sliding. This makes the height adjustment operation of the lumbar support body 2 have a gear feel and better stability.

[0049] Preferably, the adjusting device or support 110 is provided with at least five slots 101, that is, the lumbar support body 2 has at least five adjustable positions, and the degree of adjustment is relatively high.

[0050] Please refer to the attached document. Figure 4-5 In some embodiments of this application, the adjusting device includes a connector 4 connected to the front side and the backrest body 2, and a second sliding groove 111 extending vertically is recessed on the front side of the support portion 110; a snap-fit ​​6 is disposed on the side wall of the connector 4, and the groove wall of the second sliding groove 111 is correspondingly recessed to form a plurality of snap-fit ​​slots 101. This not only realizes the adjustment of the gear position between the adjusting device and the support portion 110, but also allows the snap-fit ​​6 to snap into the snap-fit ​​slots 101 simultaneously when the connector 4 is snapped into the lower opening of the second sliding groove 111, making the assembly operation relatively simple.

[0051] Please refer to the attached document. Figure 5 In some embodiments of this application, the side of the connector 4 near the snap-fit ​​6 is hollowed out to form a deformation groove 420. The side wall of the connector 4 can shrink inward with the help of the deformation groove 420 to generate elastic deformation, thereby driving the snap-fit ​​6 to retract inward.

[0052] In this embodiment, by hollowing out the connector 4 to form a deformation groove 420, the side wall of the connector 4 can easily undergo elastic deformation. Then, the elastic deformation of the connector 4 drives the snap-fit ​​6 to move between several snap-fit ​​slots 101. The structure is simple and makes the height adjustment operation of the lumbar support body 2 very convenient.

[0053] Preferably, the left and right sides of the second slide groove 111 are recessed to form a slot 101, and the left and right sides of the connector 4 are also protruding to form a snap-fit ​​6, which further enhances the connection strength between the connector 4 and the support 110, making the height adjustment operation more stable.

[0054] The connector 4 has a recessed rear side forming a first positioning groove 430, and the adjusting member 5 has a protruding front end forming a first positioning protrusion 520. When the connector 4 and the adjusting member 5 are screwed together and fixed, the first positioning protrusion 520 is engaged in the first positioning groove 430, making the positioning operation between the two relatively simple.

[0055] In this application, the gear adjustment mechanism may also adopt other types of structures:

[0056] Please refer to the attached document. Figure 8-12 In some embodiments of this application, the adjusting device includes an adjusting member 5 that is rear-engaged within a first sliding groove 131, and a engaging member 6 disposed on the adjusting member 5. The groove wall of the first sliding groove 131 is correspondingly recessed to form a plurality of engaging slots 101. This not only realizes the adjustment of the gear position between the adjusting device and the support part 110, but also allows the engaging member 6 to engage with the engaging slots 101 simultaneously when the adjusting member 5 is inserted into the first sliding groove 131, making the assembly operation relatively simple.

[0057] Please refer to the attached document. Figure 11 In some embodiments of this application, the snap-fit ​​member 6 has elastic deformation capability, and the front end of the adjusting member 5 is recessed to form a second positioning groove 530. The snap-fit ​​member 6 is snapped onto the adjusting member 5 through the second positioning groove 530, and the left and right sides of the snap-fit ​​member 6 protrude from the adjusting member 5. The snap-fit ​​member 6 moves between several slots 101 by means of its own elastic deformation.

[0058] In this embodiment, preferably, the snap-fit ​​element 6 is a rubber washer, which not only has good elastic deformation capability, but also has a large coefficient of friction, making the sliding adjustment operation of the lumbar support body 2 not only smooth, but also generating less noise. Furthermore, a second positioning protrusion 440 is formed on the rear side of the connector 4. When the connector 4 and the adjusting element 5 are screwed together and fixed, the second positioning protrusion 440 snaps into the second positioning groove 530, making the positioning operation between the connector 4 and the adjusting element 5 convenient. Moreover, the snap-fit ​​element 6 is pressed tightly against the second positioning groove 530 by the second positioning protrusion 440, resulting in a higher connection strength between the snap-fit ​​element 6 and the adjusting device.

[0059] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means three or more.

[0060] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A seat with adjustable lumbar support, characterized in that, The chair includes a backrest, a lumbar support body (2), and an adjustment device. The backrest includes a square backrest frame (1) and a support part (110) arranged horizontally in the middle of the backrest frame (1). The support part (110) has a first groove (131) extending vertically. The backrest frame (1) is fitted with a cloth cover (3). The cloth cover (3) has two surfaces, front and back. The rear surface of the cloth cover (3) facing the first groove (131) has a clearance opening (301). The adjustment device passes through the first groove (131) and is inserted into the support part (110). The front end of the adjustment device is connected to the lumbar support body (2), and the rear end of the adjustment device extends beyond the support part (110) and the clearance opening (301), so that the rear end of the adjustment device is exposed outside the cloth cover (3). The adjustment device can slide up and down along the first groove (131), thereby driving the lumbar support body (2) to slide up and down relative to the backrest.

2. The adjustable lumbar support seat according to claim 1, characterized in that, The adjustment device includes an adjustment member (5) that is snapped into the first slide groove (131) and a connector (4) that is connected to the front side of the lumbar support body (2). The front side of the chair back frame (1) is recessed to form a second slide groove (111) that extends vertically. The second slide groove (111) is a T-shaped groove. The connector (4) is slidably connected to the support part (110) through the second slide groove (111), and the connector (4) and the support part (110) are relatively fixed in the horizontal direction. The lower side of the second slide groove (111) is provided with an opening.

3. The adjustable lumbar support seat according to claim 1, characterized in that, The adjustment device includes an adjustment member (5) that is snapped into the first slide groove (131) on the rear side and a connector (4) on the front side. The front side of the support part (110) is detachably connected to a cover plate (120). The cover plate (120) has a third slide groove (121) that extends vertically. The connector (4) is clamped between the cover plate (120) and the support part (110). The connector (4) includes a hinge part (410) at the front end for connecting with the waist support body (2). The hinge part (410) extends out of the third slide groove (121) and can slide up and down along the third slide groove (121).

4. The adjustable lumbar support seat according to claim 1, characterized in that, A decorative cover (130) is detachably connected to the rear side of the support (110). A through hole (112) is formed on the support (110). A mounting part (132) is protruding from the front end of the decorative cover (130). The mounting part (132) is snapped onto the support (110) through the through hole (112). The first sliding groove (131) is formed on the mounting part (132). The cloth cover (3) is clamped between the decorative cover (130) and the support (110). The decorative cover (130) covers the clearance opening (301).

5. The adjustable lumbar support seat according to claim 1, characterized in that, The adjustment device includes an adjustment member (5) that is snapped into the first slide groove (131) and a connector (4) that is connected to the front side of the lumbar support body (2). The adjustment member (5) and the connector (4) are detachably connected by screws.

6. The adjustable lumbar support seat according to claim 1, characterized in that, A gear adjustment mechanism is provided between the adjustment device and the support part (110). The gear adjustment mechanism includes a snap-fit ​​member (6) and a plurality of slots (101). The snap-fit ​​member (6) is provided in one of the adjustment device and the support part (110), and the plurality of slots (101) are provided in the other of the adjustment device and the support part (110). When the adjustment device slides up and down, the snap-fit ​​member (6) engages with the plurality of slots (101) in sequence, so that the lumbar support body (2) can be suspended at the position where it stops sliding.

7. The adjustable lumbar support seat according to claim 6, characterized in that, The adjustment device includes a connector (4) connected to the front side and the lumbar support body (2), and the front side of the support part (110) is recessed to form a second sliding groove (111) extending in the vertical direction; the snap-fit ​​member (6) is disposed on the side wall of the connector (4), and the groove wall of the second sliding groove (111) is correspondingly recessed to form the plurality of snap-fit ​​grooves (101).

8. The adjustable lumbar support seat according to claim 7, characterized in that, The connector (4) has a hollowed-out deformation groove (420) on the side near the snap-fit ​​(6). The side wall of the connector (4) can shrink inward with the help of the deformation groove (420) to generate elastic deformation, thereby driving the snap-fit ​​(6) to shrink inward.

9. The adjustable lumbar support seat according to claim 6, characterized in that, The adjustment device includes an adjustment member (5) that is snapped into the first slide groove (131) on the rear side, and a snap-fit ​​member (6) is disposed on the adjustment member (5). The groove wall of the first slide groove (131) is correspondingly recessed to form the plurality of snap-fit ​​grooves (101).

10. The adjustable lumbar support seat according to claim 9, characterized in that, The snap-fit ​​member (6) has elastic deformation capability. The front end of the adjusting member (5) is recessed to form a second positioning groove (530). The snap-fit ​​member (6) is snapped onto the adjusting member (5) through the second positioning groove (530), and the left and right sides of the snap-fit ​​member (6) protrude from the adjusting member (5). The snap-fit ​​member (6) moves between the plurality of snap-fit ​​grooves (101) by means of its own elastic deformation.

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