Waist support assembly and seat

Abstract

The utility model discloses a waist support assembly and a seat, the waist support assembly comprises a support, a waist support body and a movable seat, the support comprises a supporting seat and two guide seats; the movable seat is in sliding fit with the supporting seat, a locking mechanism is arranged between the supporting seat and the movable seat, and the locking mechanism is used for locking the degree of freedom of relative movement of the movable seat and the supporting seat when the movable seat moves back and forth relative to the supporting seat to a plurality of different positions; the two sides of the waist support body are each provided with a guide part, the two guide parts are matched with the two guide bases respectively, the guide parts are in sliding fit with the guide bases so that the guide parts can move relative to the guide bases in the front-back direction, and elastic pieces are arranged between the guide parts and the guide bases. And the elastic piece is used for applying elastic stress to the guide part so that the guide part always keeps the trend of moving forwards relative to the guide seat. On the premise that the front-back position of the waist support body can be changed, the waist support body can adapt to the sitting posture of a user which changes at any time, and the comfort of a seat is improved.

Description

Technical Field

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

[0002] Traditional chairs support the user's back with a backrest, leaving the lower back unsupported. This can easily lead to lower back fatigue during prolonged use. To improve comfort, existing child chairs, gaming chairs, and office chairs typically include a lumbar support unit in a position suitable for supporting the user's lower back. However, a fixed lumbar support unit is difficult to adapt to different user body shapes and sitting postures. Therefore, some chairs also have an adjustable lumbar support unit. While this allows for adjustment to accommodate different user body shapes and sitting postures, the adjustment mechanism itself is limited. Once the lumbar support unit is adjusted to the appropriate position, it remains fixed, making it difficult to achieve self-adaptation and still failing to meet users' growing demands for chair comfort. Utility Model Content

[0003] The purpose of this utility model is to provide a lumbar support component and a seat, which can adjust the lumbar support body forward and backward while adapting to the user's changing sitting posture, thereby improving the comfort of the seat.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The lumbar support assembly includes a bracket mounted on the backrest or seat cushion of a seat, a lumbar support body, a movable seat fixed to the back of the lumbar support body, a support seat, and two guide seats located on both sides of the support seat.

[0006] The movable seat and the support seat slide together to allow the movable seat to move relative to the support seat in the front-back direction. A locking mechanism is provided between the support seat and the movable seat to lock the degree of freedom of relative movement between the movable seat and the support seat when the movable seat moves to multiple different positions relative to the support seat.

[0007] A guide portion is provided on each side of the lumbar support body. The two guide portions are matched with two guide seats respectively. The guide portions and guide seats slide together so that the guide portions can move relative to the guide seats in the front-back direction. An elastic element is provided between the guide portions and the guide seats. The elastic element is used to apply elastic stress to the guide portions so that the guide portions always maintain the tendency to move forward relative to the guide seats.

[0008] Preferably, the support base is provided with a sliding groove with an opening at the front end and extending from front to back, and the movable seat slides through the sliding groove.

[0009] Preferably, the movable seat is provided with a plurality of slots arranged in the front-to-back direction, and the locking mechanism includes a locking part that is movably mounted on the support seat. The locking part is configured to move relative to the support seat so that the locking part can move between a locked position engaged in the slot and an unlocked position disengaged from the slot.

[0010] Preferably, the movable seat is provided with a guide groove that extends back and forth, and multiple slots are provided on one side of the guide groove. The locking mechanism includes a locking pin that is movably connected to the support seat and inserted into the guide groove. The locking part is a boss protruding from the side of the locking pin. The length of the boss is less than the length of the locking pin so that the part of the side of the locking pin without the boss forms a clearance part.

[0011] Preferably, the locking pin has a rectangular cross-section to prevent it from rotating relative to the movable seat when sliding back and forth in the groove. One end of the locking pin is provided with a button protruding from the outer surface of the support seat. The locking mechanism also includes a return spring, which is placed between the support seat and the button. The return spring is used to apply an elastic stress to the button so that the boss always tends to move toward the locked position. The button is used to drive the locking pin to move so that the boss moves toward the unlocked position.

[0012] Preferably, the support base is provided with a first groove, the bottom surface of the first groove forms a limiting surface, and a baffle is fixed to the end of the locking pin away from the button by a screw. The baffle is placed outside the limiting surface and forms a first limiting mechanism with the limiting surface. A buckle for blocking the baffle and the screw is snapped into the first groove.

[0013] Preferably, the movable seat includes a top wall and two side walls. The side walls extend downward from both sides of the top wall, and the side walls and the top wall form an elongated groove extending in the front-back direction. A protrusion that protrudes upward and slides within the elongated groove is provided on the bottom wall of the groove. A support rib that extends downward and abuts against the upper surface of the top wall is provided on the top surface of the groove. A guide groove and a locking groove are provided on the top wall. A second mounting groove extending upward from the bottom surface of the support seat is provided on the protrusion, and the reset spring and the button are both located in the second mounting groove.

[0014] Preferably, the guide seat is provided with a forward-extending guide sleeve, the guide part is a guide post that extends backward from the waist support body and is movably inserted into the guide sleeve, and the elastic element is a buffer spring, with the two ends of the buffer spring abutting against the guide post and the guide sleeve respectively.

[0015] Preferably, a third mounting groove is provided on the guide post extending forward from its rear end. An inner guide post is provided inside the guide sleeve and passes through the third mounting groove. A buffer spring is placed in the third mounting groove, with one end abutting against the front wall of the third mounting groove and the other end abutting against the front end of the inner guide post. A movable limiting bolt passing through the inner guide post is screwed onto the front wall of the third mounting groove. A limiting step is provided on the inner guide post. The nut of the limiting bolt is located on the rear side of the limiting step and together with the limiting step, they form a second limiting mechanism to prevent the limiting bolt from moving forward.

[0016] Seat, including the aforementioned lumbar support assembly.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention allows for adjustment of the fore-and-aft position of the lumbar support body by changing the position of the movable seat relative to the support seat. This enables the lumbar support body to adapt to the user's body shape and sitting posture. The guide part cooperates with the guide seat, and an elastic element is provided between them. When using the chair, the guide part and the guide seat move relative to each other in the fore-and-aft direction, which can automatically adapt to the user's left-and-right swaying sitting posture. The angle of the fore-and-aft swaying of the side of the lumbar support body is automatically adjusted by the change of elastic stress of the elastic element, so that the lumbar support body can adapt to the user's ever-changing sitting posture and improve the comfort of the chair. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is an installation diagram of the present invention;

[0021] Figure 3 This is a cross-sectional view of the mating point between the movable seat and the support seat of this utility model;

[0022] Figure 4 for Figure 2 Schematic diagram of the structure of the movable seat;

[0023] Figure 5 for Figure 2 Schematic diagram of the central locking pin;

[0024] Figure 6 This is a cross-sectional view of the mating point between the guide part and the guide seat of this utility model;

[0025] Figure 7 This is a schematic diagram of one working state of the present invention;

[0026] Figure 8 This is a schematic diagram of another working state of the present invention.

[0027] The components are as follows: 10. Waist support body; 11. Guide post; 111. Third mounting groove; 12. Limiting bolt; 13. Buffer spring; 200. Bracket; 30. Support seat; 31. Slide groove; 32. Support rib; 33. First groove; 34. Cover; 35. Protrusion; 36. Second mounting groove; 40. Guide seat; 41. Guide sleeve; 411. Inner guide post; 412. Limiting step; 50. Movable seat; 501. Top wall; 502. Side wall; 51. Guide groove; 52. Slot; 60. Locking pin; 601. Clearance part; 602. Button; 603. Boss; 604. Screw; 605. Baffle; 61. Return spring. Detailed Implementation

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] like Figure 1 , 2As shown in Figures 3, 4, 5, 6, 7, and 8, this utility model provides a lumbar support assembly, which includes a bracket 200, a lumbar support body 10, and a movable seat 50. The bracket 200 is installed on the backrest or cushion of a seat, and the movable seat 50 is fixedly connected to the back of the lumbar support body 10. The bracket 200 includes a support base 30 and two guide seats 40, which are located on both sides of the support base 30. The support base 30 can be positioned at the middle of the width direction of the bracket 200, and the two guide seats 40 are located on both sides of the bracket 200. The guide seats 40 are connected to the support base 30 as a whole through connecting arms on the bracket 200. The movable seat 50 slides with the support base 30, allowing the movable seat 50 to move relative to the support base 30 in the front-back direction. A locking mechanism is provided between the support base 30 and the movable seat 50 to lock the degree of freedom of the movable seat 50 in the front-back movement relative to the support base 30.

[0032] Specifically, when the movable seat 50 moves to multiple different positions relative to the support seat 30, the degree of freedom of the movable seat 50 relative to the support seat 30 can be locked by a locking mechanism, so that the movable seat 50 can remain relatively fixed with the support seat 30 in multiple different positions, thereby achieving the purpose of adjusting the front and back position of the lumbar support body 10. A guide portion is provided on each side of the lumbar support body 10, and the two guide portions are respectively matched with two guide seats 40. The sliding engagement between the guide portion and the guide seat 40 allows the guide portion to move relative to the guide seat 40 in the front and back direction. An elastic element is provided between the guide portion and the guide seat 40, which applies an elastic stress to the guide portion, so that the guide portion always maintains a forward movement tendency relative to the guide seat 40.

[0033] The lumbar support assembly of this utility model can change the front-back position of the lumbar support body 10 by adjusting the front-back position of the movable seat 50 relative to the support seat 30, so that the front-back position of the lumbar support body 10 can adapt to the user's body shape and sitting posture. The guide part cooperates with the guide seat 40 and an elastic element is provided between them. When using the chair, the guide part and the guide seat 40 move relative to each other in the front-back direction, which can adapt to the user's left-right swaying sitting posture. The angle of the front-back swaying of the side of the lumbar support body 10 can be adjusted by the change of elastic stress of the elastic element, so that the lumbar support body can adapt to the user's ever-changing sitting posture and improve the comfort of the chair.

[0034] In a preferred embodiment, a groove 31 is provided on the support base 30. The groove 31 extends in the front-rear direction, and its front end extends to the front end face of the support base 30, forming an opening. The movable seat 50 can be inserted into the groove 31 through the opening at the front end of the groove 31, allowing the movable seat 50 to move relative to the support base 30 in the front-rear direction. Thus, the movable seat 50 is slidably mounted on the support base 30 in an interlocking manner. Of course, in other embodiments, the groove 31 can be provided on the movable seat 50, and the support base 30 can be configured as a strip-shaped structure so that the support base 30 can pass through the groove 31, allowing the movable seat 50 and the support base 30 to slide back and forth.

[0035] Multiple slots 52 are provided on the movable seat 50, arranged in a front-to-back direction. The locking mechanism includes a locking part movably mounted on the support seat 30, which matches the slots 52. The locking part is configured to move relative to the support seat 30. For example, a movable component can be transversely connected to the support seat 30, and the locking part can be mounted on the movable component. The movable component drives the locking part to move, allowing the locking part to move between a locked position engaged in the slot 52 and an unlocked position disengaged from the slot 52. When the locking part is in the locked position, the locking mechanism locks the movable seat 50 relative to the support seat 30 in a front-to-back movement. With the degree of freedom of movement, the lumbar support body 10 and the support seat 30 remain relatively fixed. The lumbar support body 10 can provide sufficient support for the user's waist. When the locking part is in the unlocked position, the locking part disengages from the slot 52, so that the locking mechanism no longer restricts the degree of freedom of movement of the movable seat 50 relative to the support seat 30. The lumbar support body 10 can then be moved back and forth, allowing the movable seat 50 to move back and forth along the slide groove 31, thereby adjusting the back and forth position of the lumbar support body 10. After the lumbar support body 10 is adjusted to the correct position, by operating the locking mechanism, the locking part can be inserted into the corresponding slot 52, thus keeping the lumbar support body 10 in a fixed posture again.

[0036] A pin can be inserted horizontally through the support base 30, and the locking part can be formed by the end of the pin. The locking part can be inserted into or disengaged from the slot 52 by moving the pin laterally. In a preferred embodiment, in order to facilitate operation and better support the pressure from the lumbar support body 10, a guide groove 51 extending forward and backward can be provided on the movable base 50. Multiple slots 52 are provided on one side of the guide groove 51. The locking mechanism includes a locking pin 60 that is movably inserted through the support base 30. The locking pin 60 is inserted through the support base 30 in a direction perpendicular to the forward and backward direction and extends into the interior of the slide groove 31 so that the locking pin 60 is inserted into the guide groove 51. The locking part is a boss 603 protruding from the side of the locking pin 60. The length of the boss 603 is less than the length of the locking pin 60. That is, the boss 603 is only provided on a part of the length direction of the locking pin 60. The part of the side of the locking pin 60 where the boss 603 is not provided forms a relief part 601.

[0037] See Figure 7 As shown, when the boss 603 is in the unlocked position as a locking part, the clearance part 601 on the locking pin 60 is placed in the guide groove 51, and the boss 603 is offset from the slot 52 in a direction perpendicular to the front-back direction. That is, the boss 603 is in a disengaged state from the slot 52. At this time, the boss 603 does not cooperate with the slot 52 to lock the degree of freedom of the movable seat 50 to move back and forth relative to the support seat 30. Moving the movable seat 50 allows it to move back and forth relative to the support seat 30. See also Figure 8 Move the locking pin 60 so that the boss 603 is engaged in the slot 52. At this time, the boss 603 is in the locked position. The boss 603 and the slot 52 cooperate to limit the degree of freedom of the movable seat 50 to move back and forth relative to the support seat 30.

[0038] It should be noted that a row of slots 52 can be provided on both sides of the guide groove 51, and a boss 603 can be provided on both sides of the locking pin 60, so that the cross-section of the position where the boss 603 is provided on the locking pin 60 forms a "+" shape, which increases the contact area between the locking pin 60 and the movable seat 50 when locking the movable seat 50, so that the locking pin 60 can better support the movable seat 50.

[0039] The cross-section of the locking pin 60 is rectangular, and its width is approximately equal to the width of the guide groove 51. Thus, when the clearance portion 601 on the locking pin 60 is placed in the guide groove 51 and slides back and forth along the guide groove 51, the locking pin 60 will not rotate relative to the movable seat 50. Therefore, when the locking pin 60 is moved laterally, the protrusion 603 on the locking pin 60 can be precisely embedded into the slot 52. One end of the locking pin 60 is provided with a button 602 protruding from the outer surface of the support base 30. The locking mechanism also includes a return spring 61, which is located between the support base 30 and the button 602. The return spring 61 is used to apply an elastic stress to the button 602 so that the boss 603 always tends to move toward the locked position. That is, by pushing the button 602 with the elastic stress of the return spring 61, the boss 603 can always be embedded in the slot 52 without the locking pin 60 being subjected to external force. By pressing the button 602, the return spring 61 can be compressed, and the button 602 can drive the boss 603 to move toward the unlocked position, so that the boss 603 can disengage from the slot 52.

[0040] The aforementioned locking pin 60 can extend in the vertical direction. That is, during operation, the user presses the button 602 on the locking pin 60 to make the locking pin 60 move in the vertical direction. Of course, in other embodiments, the locking pin 60 can also extend in the horizontal direction, and pressing the button 602 will make the locking pin 60 move in the horizontal direction.

[0041] To facilitate the assembly of the locking pin 60, a first groove 33 is provided on the support base 30. The first groove 33 is formed by the downward indentation of the top surface of the support base 30. The bottom surface of the first groove 33 forms a limiting surface. The button 602 of the locking pin 60 is located at its bottom end. The top end of the locking pin 60 is fixedly connected to a baffle 605 by a screw 604. The baffle 605 is placed outside the limiting surface and forms a limiting mechanism with the limiting surface. The limiting mechanism limits the downward movement of the baffle 605, thereby preventing the locking pin 60 from falling off the support base 30. When operating, the user can press the button 602 upward to make the top end of the locking pin 60 pass through the pre-set hole on the bottom wall of the first groove 33, so that the boss 603 on the locking pin 60 disengages from the slot 52 after moving upward.

[0042] A snap cover 34 is snapped into the first groove 33 to cover the baffle 605 and the screw 604. During assembly, the baffle 605 is placed above the bottom surface of the first groove 33, the locking pin 60 is inserted into the support base 30 from bottom to top and passes through the guide groove 51 on the movable base 50, the screw 604 passes through the baffle 605 from top to bottom and is screwed into the top end of the locking pin 60 to fix the baffle 605 to the locking pin 60. Finally, the snap cover 34 is snapped into the first groove 33.

[0043] The movable seat 50 includes a top wall 501 and two side walls 502. The side walls 502 extend downward from both sides of the top wall 501, thus forming a long groove extending in the front-back direction with the top wall 501. A protruding bump 35 is provided on the bottom surface of the slide groove 31, and the bump 35 is slidably embedded in the long groove. The guide groove 51 and the locking groove 52 are provided on the top wall 501. A second mounting groove 36 extending upward from the bottom surface of the support seat 30 is provided on the bump 35. The return spring 61 and the button 602 are both located inside the second mounting groove 36. Because the long groove is provided on the movable seat 50, the movable seat 50 can achieve the desired effect. A long groove is formed on the seat 50 to avoid the protrusion 35. The protrusion 35 cooperates with the long groove to guide the back-and-forth movement of the movable seat 50. It also allows the guide groove 51 and the locking groove 52 to be set on the relatively thin top wall 501. In this way, after the locking pin 60 moves up and down by a relatively small displacement, the boss 603 on it can move up by a small displacement and then disengage from the locking groove 52, which is convenient for the user to operate. In addition, the second mounting groove 36 provided on the protrusion 35 is used to accommodate the return spring 61 and the button 602, which provides better protection for the return spring 61 and the button 602. Furthermore, a downwardly extending support rib 32 is provided on the top surface of the slide groove 31. The support rib 32 abuts against the upper surface of the top wall 501, thereby clamping the top wall 501 with the protrusion 35 through the support rib 32, preventing the movable seat 50 from swinging up and down when moving back and forth.

[0044] A forward-extending guide sleeve 41 is provided on the guide seat 40. The guide part is a guide post 11 extending backward from the back of the lumbar support body 10. The guide post 11 is movably inserted in the guide sleeve 41. The elastic element is a buffer spring 13. The two ends of the buffer spring 13 abut against the guide post 11 and the guide sleeve 41 respectively. When the side of the lumbar support body 10 is pressed backward, the guide post 11 moves backward relative to the guide sleeve 41 to realize the adaptive backward swing of the left and right sides of the lumbar support body 10. As the guide post 11 moves backward, it compresses the buffer spring 13. The elastic stress of the buffer spring 13 gradually increases and eventually reaches a balance with the user's pressure on the side of the lumbar support body 10, so that the side of the lumbar support body 10 swings to the optimal support position and realizes adaptive support for the user's waist.

[0045] The aforementioned guide post 11 is provided with a third mounting groove 111 extending forward from its rear end. An inner guide post 411 is provided inside the guide sleeve 41, passing through the third mounting groove 111. A buffer spring 13 is placed inside the third mounting groove 111, with one end abutting against the front wall of the third mounting groove 111 and the other end abutting against the front end of the inner guide post 411. A limiting bolt 12 is screwed onto the front wall of the third mounting groove 111, and the limiting bolt 12 is movably inserted through the inner guide post. On the inner guide post 411, a limiting step 412 is provided. The nut of the limiting bolt 12 is located on the rear side of the limiting step 412. The limiting bolt 12 and the limiting step 412 together form a limiting mechanism. This limiting mechanism is used to prevent the limiting bolt 12 from moving forward and to prevent the guide post 11 from disengaging from the guide sleeve 41. During assembly, the limiting bolt 12 can pass through the inner guide post 411 from the rear side and be screwed onto the front end wall of the third mounting groove 111. It should be noted that the above-mentioned elastic element is not limited to the buffer spring 13 mentioned above; it can also be other elastic components such as elastic rubber blocks.

[0046] The seat of this utility model includes the lumbar support component described above. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0047] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A lumbar support assembly, characterized in that, Includes a bracket installed on the backrest or seat cushion of the seat, a lumbar support body, and a movable seat fixed to the back of the lumbar support body; The bracket includes a support base and two guide seats located on both sides of the support base; The movable seat and the support seat slide together to allow the movable seat to move relative to the support seat in the front-back direction. A locking mechanism is provided between the support seat and the movable seat to lock the degree of freedom of relative movement between the movable seat and the support seat when the movable seat moves to multiple different positions relative to the support seat. A guide portion is provided on each side of the lumbar support body. The two guide portions are matched with two guide seats respectively. The guide portions and guide seats slide together so that the guide portions can move relative to the guide seats in the front-back direction. An elastic element is provided between the guide portions and the guide seats. The elastic element is used to apply elastic stress to the guide portions so that the guide portions always maintain the tendency to move forward relative to the guide seats.

2. The lumbar support assembly as described in claim 1, characterized in that, The support base is provided with a sliding groove with an opening at the front end that extends from front to back, and the movable seat slides through the sliding groove.

3. The lumbar support assembly as described in claim 2, characterized in that, The movable seat is provided with multiple slots arranged in the front-to-back direction. The locking mechanism includes a locking part that is movably mounted on the support seat. The locking part is configured to move relative to the support seat so that the locking part can move between a locked position engaged in the slot and an unlocked position disengaged from the slot.

4. The lumbar support assembly as described in claim 3, characterized in that, The movable seat is provided with a guide groove that extends back and forth. Multiple slots are provided on one side of the guide groove. The locking mechanism includes a locking pin that is movably connected to the support seat and inserted into the guide groove. The locking part is a boss protruding from the side of the locking pin. The length of the boss is less than the length of the locking pin so that the part of the side of the locking pin without the boss forms a clearance part.

5. The lumbar support assembly as described in claim 4, characterized in that, The locking pin has a rectangular cross-section to prevent it from rotating relative to the movable seat when sliding back and forth in the groove. One end of the locking pin is provided with a button protruding from the outer surface of the support seat. The locking mechanism also includes a return spring, which is placed between the support seat and the button. The return spring is used to apply an elastic stress to the button so that the boss always tends to move toward the locked position. The button is used to drive the locking pin to move the boss toward the unlocked position.

6. The lumbar support assembly as described in claim 5, characterized in that, The support base is provided with a first groove, the bottom surface of the first groove forms a limiting surface, and a baffle is fixed to the end of the locking pin away from the button by a screw. The baffle is placed outside the limiting surface and forms a first limiting mechanism with the limiting surface. A buckle for blocking the baffle and the screw is snapped into the first groove.

7. The lumbar support assembly as described in claim 5, characterized in that, The movable seat includes a top wall and two side walls. The side walls extend downward from the sides of the top wall, forming a long groove extending in the front-to-back direction with the top wall. A protrusion that is raised upward and slidably embedded in the long groove is provided on the bottom wall of the groove. A support rib that extends downward and abuts against the upper surface of the top wall is provided on the top surface of the groove. A guide groove and a locking groove are provided on the top wall. A second mounting groove extending upward from the bottom surface of the support seat is provided on the protrusion. The reset spring and the button are both located in the second mounting groove.

8. The lumbar support assembly as claimed in claim 1, characterized in that, The guide seat is provided with a forward-extending guide sleeve. The guide part is a guide post that extends backward from the waist support body and is movably inserted into the guide sleeve. The elastic element is a buffer spring, with the two ends of the buffer spring abutting against the guide post and the guide sleeve, respectively.

9. The lumbar support assembly as described in claim 8, characterized in that, A third mounting groove is provided on the guide post, extending forward from its rear end. An inner guide post is provided inside the guide sleeve, passing through the third mounting groove. A buffer spring is placed in the third mounting groove, with one end abutting against the front wall of the third mounting groove and the other end abutting against the front end of the inner guide post. A movable limiting bolt is screwed onto the front wall of the third mounting groove and passes through the inner guide post. A limiting step is provided on the inner guide post. The nut of the limiting bolt is located on the rear side of the limiting step and together with the limiting step, they form a second limiting mechanism to prevent the limiting bolt from moving forward.

10. A seat, characterized in that, Includes the lumbar support assembly as described in any one of claims 1-9.

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