Adjustable waist support assembly and seat

Abstract

The adjustable waist support assembly comprises a support, a front connecting rod, a rear connecting rod, an upper connecting rod, a lower connecting rod, a lifting seat, a waist support and an air pressure rod, the front connecting rod, the rear connecting rod, the upper connecting rod and the lower connecting rod jointly form a parallel four-connecting-rod mechanism; the lifting seat is movably matched with the lower connecting rod, the waist support is mounted on the lifting seat, and a first elastic element is arranged between the lower connecting rod and the lifting seat; one end of the air pressure rod is hinged to the support, the other end of the air pressure rod is hinged to one of the front connecting rod, the rear connecting rod and the lower connecting rod, and a control button is arranged on the air pressure rod. The angle of the supporting face used for supporting the waist of the user on the waist support is kept unchanged all the time, and the comfort of the waist support assembly is improved. The lifting seat is self-adaptive to the waist height of the user, so that the position change of the height of the waist support caused by the front-back position change of the waist support is eliminated.

Description

Technical Field

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

[0002] Many office chairs, gaming chairs, and study chairs are equipped with lumbar support components to support the user's lower back and alleviate lower back fatigue. These lumbar support components are usually adjustable to accommodate different sitting postures and body types. Current adjustable lumbar support structures often feature a back-and-forth swing mechanism. When the lumbar support swings back and forth, the angle of the support surface that provides support to the user's lower back changes. This change in angle makes it difficult for the support surface to conform properly to the user's lower back, significantly reducing the chair's comfort. Utility Model Content

[0003] The purpose of this invention is to provide an adjustable lumbar support component and seat, which can fit well with the user's waist when adjusted to different positions, thereby improving comfort.

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

[0005] Adjustable lumbar support assembly, including bracket, front link, rear link, upper link, lower link, lifting seat, lumbar support, and gas spring;

[0006] The upper link is fixedly connected to the bracket. The upper end of the front link is hinged to the front end of the upper link. The rear link is located behind the front link and its upper end is hinged to the rear end of the upper link. The lower ends of the front link and the rear link are both hinged to the lower link. The front link, rear link, upper link and lower link together form a parallel four-bar linkage.

[0007] The lifting seat and the lower connecting rod are movably coupled so that the lifting seat can move up and down relative to the lower connecting rod. The lumbar support is installed on the lifting seat. A first elastic element is provided between the lower connecting rod and the lifting seat. The first elastic element is used to apply upward elastic stress to the lifting seat. The lumbar support is installed on the lifting seat.

[0008] One end of the pneumatic rod is hinged to the bracket, and the other end is hinged to one of the front link, rear link, and lower link. A control button is provided on the pneumatic rod. When the control button is pressed, the two ends of the pneumatic rod can move relative to each other. When the control button is not pressed, the two ends of the pneumatic rod remain relatively fixed.

[0009] Preferably, a swing seat is provided on the lower connecting rod, and the bottom of the swing seat is pivotally connected to the lower connecting rod so that the swing seat can swing relative to the lower connecting rod in the front-back direction. A second elastic element is provided between the swing seat and the lower connecting rod, and the second elastic element is used to apply forward elastic stress to the swing seat. A guide portion extending in the vertical direction is provided on the swing seat, and a lifting seat is slidably mounted on the guide portion so that the lifting seat and the lower connecting rod can be movably engaged.

[0010] Preferably, the swing seat is located outside the lower connecting rod, the guide part is a protrusion protruding outward from the outside of the swing seat, the lifting seat is located outside the swing seat, the lifting seat is provided with a slide groove extending in the vertical direction, the protrusion is slidably embedded in the slide groove, the outside of the lifting seat is provided with a stop block that is detachably fixed to the protrusion, the lifting seat is limited between the stop block and the swing seat, and the first elastic element is a tension spring, the upper and lower ends of the tension spring are respectively connected to the protrusion and the lifting seat.

[0011] Preferably, the top of the swing seat is provided with two baffles that are staggered in the front-rear direction, the top of the lower connecting rod is provided with a stop part placed between the two baffles, and the second elastic element is a spring, with the front and rear ends of the spring abutting against the baffle and the stop part located on the front side, respectively.

[0012] Preferably, the swing seat is provided with a pivot extending inward, the bottom of the lower connecting rod is provided with a shaft hole for the pivot to pass through, and the lower end of the rear connecting rod is pivotally connected to the pivot; the lower connecting rod is provided with a limiting groove, the limiting groove is arc-shaped and the center of its arc falls on the central axis of the pivot, and the swing seat is provided with a limiting rod that slides through the limiting groove.

[0013] Preferably, the lumbar support includes an outer support frame, which includes two vertical beams extending in the vertical direction. The front link and the rear link are both located between the two vertical beams and are both inverted V-shapes. The inner side of each of the two vertical beams is provided with a lifting seat, a swing seat and a lower link. The two sides of the front link are pivotally connected to the two lower links respectively, and the two sides of the rear link are pivotally connected to the two lower links respectively.

[0014] Preferably, the outer frame includes a bottom beam connected between the bottoms of the two vertical beams, and a receiving space is formed between the front connecting rod, the rear connecting rod and the bottom beam. A mounting plate is provided between the two vertical beams, and a massage mechanism located in the receiving space is connected to the mounting plate.

[0015] Preferably, the pneumatic rod includes a cylinder body, a piston mounted on the cylinder body, a control button on the piston, a connecting seat fixed on the piston, and a lever pivotally connected to the connecting seat in the middle. One end of the lever is connected to a pull rope, and the other end forms a pressing end placed on the control button.

[0016] Preferably, the cylinder of the pneumatic rod is hinged to the bracket, a rotating shaft is threaded through the connecting seat, a groove is provided on the rear side of the front connecting rod, the rotating shaft is embedded in the groove, and a pressure seat is detachably fixed on the front connecting rod, the pressure seat covers the opening of the groove and presses it onto the rotating shaft.

[0017] The seat, including the aforementioned adjustable lumbar support assembly.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this invention, because the angle of the lower connecting rod remains constant, the angle of the support surface on the lumbar support that supports the user's waist also remains constant. This ensures that the support surface of the lumbar support fits well with the user's waist regardless of the lumbar support's position, improving the comfort of the lumbar support assembly. Furthermore, as the lumbar support changes position, its height also changes. The lifting seat and the elastic element that applies upward elastic stress to the lifting seat allow the lumbar support's height to adapt to the user's waist height, eliminating the change in lumbar support height caused by changes in its forward / backward position. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a schematic diagram of the assembly of the lower connecting rod, the swing seat, and the lifting seat of this utility model;

[0024] Figure 5 This is a schematic diagram of one usage state of the present invention;

[0025] Figure 6 This is a schematic diagram illustrating another usage state of the present invention;

[0026] Figure 7 This is a schematic diagram of the assembly of the pneumatic rod and the front connecting rod of this utility model.

[0027] The components are as follows: 10. Bracket; 21. Front connecting rod; 211. Groove; 212. Pressure seat; 213. Rotating shaft; 22. Rear connecting rod; 23. Upper connecting rod; 24. Lower connecting rod; 241. Stop; 242. Shaft hole; 243. Limiting groove; 30. Pneumatic rod; 31. Cylinder; 32. Piston; 33. Control button; 34. Connecting seat; 35. Actuating rod; 36. Pull rope; 40. Waist support; 41. Vertical beam; 42. Bottom beam; 43. Mounting plate; 50. Lifting seat; 51. Slide groove; 60. Swing seat; 61. Stop block; 62. Tension spring; 63. Spring; 64. Protrusion; 65. Pivot; 66. Limiting rod; 67. Baffle plate; 68. Baffle plate; 70. Massage mechanism. 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, and 7, this utility model provides an adjustable lumbar support assembly, which includes a bracket 10, a front connecting rod 21, a rear connecting rod 22, an upper connecting rod 23, a lower connecting rod 24, a lifting seat 50, a lumbar support 40, and a gas spring 30. The bracket 10 can be fixed to the back of the seat, or the bracket 10 can be the backrest support of the seat. The upper connecting rod 23 is fixed to the bracket 10. The upper end of the front connecting rod 21 is hinged to the front end of the upper connecting rod 23. The rear connecting rod 22 is located behind the front connecting rod 21, and its upper end is hinged to the rear end of the upper connecting rod 23. The lower ends of the front connecting rod 21 and the lower ends of the rear connecting rod 22 are both hinged to the lower connecting rod 24. The front connecting rod 21 and the rear connecting rod 22 are parallel, and the upper connecting rod 23 and the lower connecting rod 24 are parallel, so that the front connecting rod 21, the rear connecting rod 22, the upper connecting rod 23, and the lower connecting rod 24 together form a parallel four-bar linkage.

[0032] The lifting seat 50 and the lower connecting rod 24 are movably connected, allowing the lifting seat 50 to move relative to the lower connecting rod 24 in the vertical direction. The lumbar support 40 is mounted on the lifting seat 50, and the lumbar support 40 is mounted to the lower connecting rod 24 via the lifting seat 50, giving the lumbar support 40 a degree of freedom of movement relative to the lower connecting rod 24 in the vertical direction. A tension spring 62 is provided between the lower connecting rod 24 and the lifting seat 50, which applies an upward elastic stress to the lifting seat 50, thereby ensuring that the lifting seat 50 always maintains an upward tendency relative to the lower connecting rod 24. The pneumatic rod 30 is used to drive the above-mentioned parallel four-bar linkage to swing back and forth. Specifically, one end of the pneumatic rod 30 is hinged to the bracket 10, and the other end is hinged to one of the front connecting rod 21, the rear connecting rod 22, or the lower connecting rod 24.

[0033] In a preferred embodiment, the other end of the pneumatic rod 30 is hinged to the front link 21. The pneumatic rod 30 can push the front link 21 to swing forward. When the front link 21 swings forward, the lower link 24 will generate a forward displacement. When the lower link 24 moves forward, it will also generate an upward displacement. However, the lower link 24 itself will not swing. That is, the lower link 24 will not tilt when it is driven by the parallel four-bar linkage to make back-and-forth translation. This ensures that the angle of the waist support 40 installed on the lower link 24 will not change.

[0034] A control button 33 is provided on the pneumatic lever 30. By operating the control button 33, the state of the pneumatic lever 30 can be changed. Specifically, when the control button 33 is pressed, the two ends of the pneumatic lever 30 can move relative to each other. At this time, the pneumatic lever 30 provides elastic support between the bracket 10 and the front connecting rod 21. When the front connecting rod 21 is not subjected to external force, the pneumatic lever 30 extends and pushes the front connecting rod 21 forward. When the front connecting rod 21 is subjected to a backward external force, the pneumatic lever 30 retracts. When the control button 33 is not pressed, the two ends of the pneumatic lever 30 remain relatively fixed. At this time, the pneumatic lever 30 provides rigid support between the bracket 10 and the front connecting rod 21. In this case, the pneumatic lever 30 connects the bracket 10 and the front connecting rod 21, keeping the front connecting rod 21 relatively fixed to the bracket 10.

[0035] It should be noted that the tension spring 62 mentioned above can also be replaced by other elastic elements such as springs or leaf springs, as long as they can provide an upward elastic stress to the lifting seat 50.

[0036] When in use, the lumbar support assembly of this utility model provides support for the user's waist using the lumbar support 40. When it is necessary to adjust the front and back position of the lumbar support 40, press the control button 33 of the gas spring 30 to make the gas spring 30 elastically supportive. The user's waist presses the lumbar support 40 backward, and the lumbar support 40 drives the lower connecting rod 24 to move backward, causing the front connecting rod 21 and the rear connecting rod 22 to swing backward. When the lumbar support 40 moves to the optimal support position, release the press of the control button 33, and the gas spring 30 becomes rigidly supportive, keeping the lumbar support 40 in the adjusted position.

[0037] During the adjustment of the lumbar support 40's position, the angle of the lower connecting rod 24 remains constant, and consequently, the angle of the support surface on the lumbar support 40 that supports the user's waist remains constant. This ensures that the support surface of the lumbar support 40 fits well against the user's waist regardless of the lumbar support 40's position, improving the comfort of the lumbar support assembly. Furthermore, as the lumbar support 40 changes position, its height also changes. The lifting seat 50 and the elastic element that applies upward elastic stress to the lifting seat 50 allow the height of the lumbar support 40 to adapt to the user's waist height, eliminating the change in the lumbar support 40's height caused by changes in its forward and backward position.

[0038] In a preferred embodiment, a swing seat 60 is provided on the lower connecting rod 24. The swing seat 60 enables the lumbar support 40 to swing back and forth at a small angle, so that the lumbar support 40 can adapt to the small angle changes of the waist when the user's sitting posture changes.

[0039] Specifically, the bottom of the swing seat 60 is pivotally connected to the lower connecting rod 24, allowing the swing seat 60 to swing relative to the lower connecting rod 24 in the front-back direction. A spring 63 is provided between the swing seat 60 and the lower connecting rod 24, which applies a forward elastic stress to the swing seat 60. The lifting seat 50 is movably mounted on the swing seat 60, allowing the lifting seat 50 to move relative to the swing seat 60 in the vertical direction, thereby giving the lifting seat 50 a degree of freedom of movement relative to the lower connecting rod 24 in the vertical direction. Specifically, a guide portion extending in the vertical direction is provided on the swing seat 60, and the lifting seat 50 is slidably mounted on the guide portion. Thus, through the lifting seat 50 and the swing seat 60, the lumbar support 40 has a degree of freedom of vertical movement relative to the lower connecting rod 24, while also being able to swing back and forth relative to the lower connecting rod 24. The spring 63 applies a forward elastic stress to the swing seat 60. When the user leans back, the lumbar support 40 swings backward to compress the spring 63. When the user sits upright, the spring 63 rebounds, causing the lumbar support 40 to swing forward to achieve a reset.

[0040] In other embodiments, spring 63 may be replaced by other elastic elements such as tension springs or sheet springs.

[0041] The swing seat 60 is located outside the lower connecting rod 24. The guide part is a protrusion 64 protruding outward from the outer side of the swing seat 60. The lifting seat 50 is located outside the swing seat 60. The lifting seat 50 is provided with a slide groove 51 extending in the vertical direction. The protrusion 64 is slidably embedded in the slide groove 51. The slide groove 51 and the protrusion 64 form a linear guide pair extending in the vertical direction, which slidably mounts the lifting seat 50 on the outside of the swing seat 60. The outer side of the lifting seat 50 is provided with a part that is detachable from the protrusion 64. A fixed stop 61 is used to confine the lifting seat 50 between the stop 61 and the swing seat 60. During assembly, the lifting seat 50 can be assembled with the swing seat 60 from the outside, so that the protrusion 64 is embedded in the slide groove 51. Then, the stop 61 is fixed to the protrusion 64 with screws. The stop 61 prevents the lifting seat 50 from detaching from the swing seat 60. The protrusion 64 and the swing seat 60 can limit and guide the lifting seat 50, preventing the lifting seat 50 from swaying when moving up and down. The upper end of the tension spring 62 is attached to the protrusion 64, and the lower end is attached to the lifting seat 50.

[0042] The top of the swing seat 60 is provided with baffles 67 and 68, which are offset in the front-back direction. Baffle 67 is located in front of baffle 68, and the two are offset by a certain distance in the front-back direction. The top of the lower connecting rod 24 is provided with a stop part 241 placed between baffles 67 and baffles 68. The two ends of the spring 63 abut against the baffles 67 and the stop part 241 respectively. By cooperating with the stop part 241, the maximum range of the back-and-forth swing of the swing seat 60 relative to the lower connecting rod 24 is limited. The interval between baffles 67 and baffles 68 can be set accordingly so that the angle range of the back-and-forth swing of the lumbar support 40 meets the user's usage requirements in different sitting postures.

[0043] A pivot 65 extending inward is provided on the swing seat 60, and a shaft hole 242 for the pivot 65 to pass through is provided on the top of the lower connecting rod 24. The swing seat 60 and the lower connecting rod 24 are pivotally connected together by the pivot 65. The lower end of the rear connecting rod 22 is pivotally connected to the pivot 65. The lower connecting rod 24 and the rear connecting rod 22 are hinged by the pivot 65. In other words, the three components of the swing seat 60, the lower connecting rod 24 and the rear connecting rod 22 are connected together by a pivot 65, which simplifies the structure of the lumbar support assembly.

[0044] A limiting groove 243 is provided on the lower connecting rod 24. The limiting groove 243 is arc-shaped, and the center of the arc of the limiting groove 243 falls on the central axis of the pivot 65. A limiting rod 66 is provided on the swing seat 60, which slides through the limiting groove 243. The limiting rod 66 slides between the two ends of the limiting groove 243, limiting the angle range of the swing seat 60 relative to the lower connecting rod 24. Together with the limiting structure composed of the baffle 67, baffle 68 and stop part 241, the swing seat 60 can swing relatively stably relative to the lower connecting rod 24. At the same time, the stress between the swing seat 60 and the lower connecting rod 24 is dispersed, which improves the strength of the lumbar support assembly.

[0045] like Figure 5 As shown, when the swing seat 60 is in the forward position, the spring 63 pushes the stop plate 67 forward, causing the stop part 241 to abut against the front side of the stop plate 68, while the limiting rod 66 abuts against the front end of the limiting groove 243; Figure 6 As shown, when the user presses the lumbar support 40 backward, causing the lumbar support 40 to swing backward to the last side position, the limiting rod 66 abuts against the rear end of the limiting groove 243, and the spring 63 is compressed and contracted to its shortest state by the baffle 67 and the stop part 241.

[0046] To provide stable support for the user's lower back, the lumbar support 40 includes an outer support frame. The outer support frame includes two vertical beams 41 extending vertically. A front link 21 and a rear link 22 are located between the two vertical beams 41, and the front link 21 and rear link 22 are configured in an inverted V-shape. Their tops are hinged to an upper link 23. The inverted V-shape of the front link 21 and rear link 22 creates a connecting end on each side of their bottom. Each side is equipped with a lifting seat 50, a swing seat 60, and a lower connecting rod 24. The two connecting ends at the bottom of the front connecting rod 21 are pivotally connected to the two lower connecting rods 24, and the two connecting ends at the bottom of the rear connecting rod 22 are pivotally connected to the two lower connecting rods 24. In this way, the lower connecting rods 24 on both sides drive the lumbar support 40 to move back and forth and provide support for the lumbar support 40, making the back and forth adjustment of the lumbar support 40 more stable. When the pneumatic rod 30 is in a rigid support state, the two lower connecting rods 24 can provide stable support for the lumbar support 40.

[0047] The outer frame of the lumbar support 40 also includes a bottom beam 42 connected between the bottoms of the two vertical beams 41. A receiving space is formed between the front connecting rod 21, the rear connecting rod 22 and the bottom beam 42. A mounting plate 43 is provided between the two vertical beams 41. A massage mechanism 70 located in the receiving space is connected to the mounting plate 43. The massage mechanism 70 is placed in the receiving space to avoid interference between the massage mechanism 70 and the parallel four-bar linkage.

[0048] The pneumatic lever 30 includes a cylinder 31 and a piston 32. The piston 32 is installed in the cylinder 31, and a control button 33 is located on the piston 32. A connecting seat 34 is fixedly connected to the piston 32, and a toggle lever 35 is provided on the connecting seat 34. The middle part of the toggle lever 35 is pivotally connected to the connecting seat 34. One end of the toggle lever 35 is connected to a pull rope 36, and the other end of the toggle lever 35 is placed on the control button 33 to form the pressing end of the control button 33. The pull rope 36 can be connected to a switch mechanism on the seat. When the user operates the switch mechanism, the pull rope 36 is tightened, thereby causing the pressing end of the toggle lever 35 to press down the control button 33. When the control button 33 is pressed, the pneumatic lever 30 is in an elastic support state. When the user releases the switch mechanism, the toggle lever 35 returns to its original position, and the pneumatic lever 30 returns to a rigid support state.

[0049] The cylinder body 31 of the pneumatic rod 30 is hinged to the bracket 10, and the connecting seat 34 is pivotally connected to the front connecting rod 21 to hinge the piston rod 32 to the front connecting rod 21. Specifically, a rotating shaft 213 is threaded through the connecting seat 34, and a groove 211 is provided on the rear side of the front connecting rod 21. The rotating shaft 213 can be inserted into the groove 211 through the opening of the groove 211. A pressure seat 212 is detachably fixed on the front connecting rod 21. The pressure seat 212 covers the opening of the groove 211 and presses the rotating shaft 213 to fix the rotating shaft 213 to the front connecting rod 21. This facilitates the assembly of the pneumatic rod 30 and the front connecting rod 21.

[0050] In other embodiments, the piston 32 of the pneumatic rod 30 may be hinged to the rear connecting rod 22 or the lower connecting rod 24, and the mounting structure of the pneumatic rod 30 with the rear connecting rod 22 and the lower connecting rod 24 may adopt the same structure as described above; in some other embodiments, the piston rod 32 of the pneumatic rod 30 may be hinged to the bracket 10, and the cylinder 31 of the pneumatic rod 30 may be hinged to one of the front connecting rod 21, the rear connecting rod 22, and the lower connecting rod 24.

[0051] The seat of this utility model includes the aforementioned adjustable lumbar support assembly. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0052] 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. An adjustable lumbar support assembly, characterized in that, Includes bracket, front link, rear link, upper link, lower link, lifting seat, lumbar support, and gas spring; The upper link is fixedly connected to the bracket. The upper end of the front link is hinged to the front end of the upper link. The rear link is located behind the front link and its upper end is hinged to the rear end of the upper link. The lower ends of the front link and the rear link are both hinged to the lower link. The front link, rear link, upper link and lower link together form a parallel four-bar linkage. The lifting seat and the lower connecting rod are movably coupled so that the lifting seat can move up and down relative to the lower connecting rod. The lumbar support is installed on the lifting seat. A first elastic element is provided between the lower connecting rod and the lifting seat. The first elastic element is used to apply upward elastic stress to the lifting seat. The lumbar support is installed on the lifting seat. One end of the pneumatic rod is hinged to the bracket, and the other end is hinged to one of the front link, rear link, and lower link. A control button is provided on the pneumatic rod. When the control button is pressed, the two ends of the pneumatic rod can move relative to each other. When the control button is not pressed, the two ends of the pneumatic rod remain relatively fixed.

2. The adjustable lumbar support assembly as described in claim 1, characterized in that, A swing seat is provided on the lower connecting rod. The bottom of the swing seat is pivotally connected to the lower connecting rod so that the swing seat can swing relative to the lower connecting rod in the front-back direction. A second elastic element is provided between the swing seat and the lower connecting rod. The second elastic element is used to apply forward elastic stress to the swing seat. A guide portion extending in the vertical direction is provided on the swing seat. The lifting seat is slidably mounted on the guide portion so that the lifting seat and the lower connecting rod can be movably engaged.

3. The adjustable lumbar support assembly as described in claim 2, characterized in that, The swing seat is located outside the lower connecting rod. The guide part is a protrusion protruding outward from the outside of the swing seat. The lifting seat is located outside the swing seat. A groove extending in the vertical direction is provided on the lifting seat. The protrusion is slidably embedded in the groove. A stop block that is detachably fixed to the protrusion is provided on the outside of the lifting seat. The lifting seat is limited between the stop block and the swing seat. The first elastic element is a tension spring. The upper and lower ends of the tension spring are respectively connected to the protrusion and the lifting seat.

4. The adjustable lumbar support assembly as described in claim 2, characterized in that, The top of the swing seat is provided with two baffles that are staggered in the front-back direction. The top of the lower connecting rod is provided with a stop part placed between the two baffles. The second elastic element is a spring, and the front and rear ends of the spring abut against the baffle and the stop part located on the front side, respectively.

5. The adjustable lumbar support assembly as described in claim 2, characterized in that, The swing seat is provided with a pivot extending inward, and the bottom of the lower connecting rod is provided with a shaft hole for the pivot to pass through. The lower end of the rear connecting rod is pivotally connected to the pivot. The lower connecting rod is provided with a limiting groove, which is arc-shaped and its center falls on the central axis of the pivot. The swing seat is provided with a limiting rod that slides through the limiting groove.

6. The adjustable lumbar support assembly as described in claim 2, characterized in that, The lumbar support includes an outer support frame, which includes two vertical beams extending in the vertical direction. The front link and the rear link are both located between the two vertical beams and are both inverted V-shapes. The inner side of each of the two vertical beams is provided with a lifting seat, a swing seat and a lower link. The two sides of the front link are pivotally connected to the two lower links respectively, and the two sides of the rear link are pivotally connected to the two lower links respectively.

7. The adjustable lumbar support assembly as described in claim 6, characterized in that, The outer frame includes a bottom beam connected between the bottoms of the two vertical beams, and a receiving space is formed between the front connecting rod, the rear connecting rod and the bottom beam. A mounting plate is provided between the two vertical beams, and a massage mechanism located in the receiving space is connected to the mounting plate.

8. The adjustable lumbar support assembly as claimed in claim 1, characterized in that, The pneumatic lever includes a cylinder body, a piston mounted on the cylinder body, a control button located on the piston, a connecting seat fixed on the piston, and a lever pivotally connected to the connecting seat in the middle. One end of the lever is connected to a pull rope, and the other end forms a pressing end placed on the control button.

9. The adjustable lumbar support assembly as described in claim 8, characterized in that, The cylinder of the pneumatic rod is hinged to the bracket, and a rotating shaft is threaded through the connecting seat. A groove is provided on the rear side of the front connecting rod, and the rotating shaft is embedded in the groove. A pressure seat is detachably fixed on the front connecting rod, and the pressure seat covers the opening of the groove and presses it onto the rotating shaft.

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

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