Adjustable lumbar vertebra supporting seat

Abstract

The utility model relates to the technical field of lumbar vertebra supporting, in particular to an adjustable lumbar vertebra supporting seat. Comprising a seat plate frame, a back plate is arranged on the seat plate frame, and a lifting plate is slidably connected into the back plate; vertical shafts are rotationally connected to the left end and the right end of the lifting plate, supporting frames are fixedly connected to the vertical shafts, movable telescopic rods are slidably connected to the supporting frames, movable sleeves are fixedly connected to the upper portions of the movable telescopic rods, gas spring cylinder bodies are rotationally connected to the movable sleeves, and fixed limiting crank arms slidably connected with the gas spring cylinder bodies are fixedly connected to the movable sleeves. The air spring cylinder body is connected with a locking knob matched with the fixed limiting crank arm, the other end of the air spring cylinder body is slidably connected with an air spring piston rod, and the other end of the air spring piston rod is slidably connected with the supporting frame; a movable adjusting rod is slidably connected to the interior of the movable sleeve, an armpit support is rotatably connected to the movable adjusting rod, and the problems that in the prior art, the supporting force value of a lumbar vertebra supporting instrument cannot be set, and the distance between the armpit supports cannot be adjusted are effectively solved.

Description

Technical Field

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

[0002] Lumbar traction is an effective method for relieving and treating common lumbar spine diseases. The principle of this treatment is to use external force to widen the intervertebral space of the lumbar spine, causing the herniated nucleus pulposus to reposition to a certain extent, thereby reducing or eliminating the compression of the nerve root by the nucleus pulposus, and rapidly reducing or eliminating the user's lower back and leg pain.

[0003] Existing lumbar support traction methods mainly utilize supine traction beds or support frames, lumbar-abdominal traction supports, and upper arm suspension traction devices. The supine traction method places the lower force point on the upper hip bone, applying downward tension through a connected traction strap. The other end uses a chest strap tightly bound to the chest, applying upward tension through a connected traction strap. To prevent slippage of the chest strap, the binding force must be significant, causing considerable pressure on the chest and rib area. Discomfort during binding and traction primarily manifests as compression pain and difficulty breathing; female users find the pressure on the chest even more unbearable. Another abdominal support traction method uses a lumbar strap tightly bound to the upper hip bone at the lower end, and an abdominal strap tightly bound to the lower ribs at the upper end. A retractable support device is installed on each side of the body using both straps, with the support force adjusted using a double-ended screw nut. Adjusting the length of the support device generates traction force on the lumbar spine; applying greater support force can cause severe discomfort. There are also similar devices that use armpit supports, but the support force is applied in a rigid manner, which makes the support force value uncontrollable and therefore poses certain safety hazards.

[0004] Patent number CN219963204U, entitled "A Lumbar Traction Chair," discloses a lumbar traction chair, including a seat body. A lifting frame is provided on the rear side of the seat body. Two symmetrically arranged underarm fixing straps are fixedly installed on both sides of the lifting frame. Underarm support devices are symmetrically arranged at the top of both sides of the lifting frame and are threadedly rotatably connected to them. Two symmetrically arranged lower fixing straps are fixedly installed on both sides of the seat body. This invention uses the underarm fixing straps to fix the chest of the human body; the underarm support devices to limit the shoulders of the human body; and the lower fixing straps to fix the buttocks of the human body, thus placing the human body in a traction and stretching state. The same rigid mechanical support method also poses the risk of uncontrollable support force. If the upward lifting stroke is not properly controlled, the support force on the lumbar spine will increase dramatically, which increases the risk of lumbar spine injury from violent strain. Public literature records that the appropriate lumbar support traction force is 20-50 kg, and different support forces should be set according to the individual user's situation. There are also some publicly available multi-functional support and traction chair technology solutions, including rehabilitation and health care support or multi-purpose chair technology solutions for office and home use, which claim to be usable as a chair and lumbar support chair, but the armrest spacing is not adjustable. Therefore, it is impossible to switch between uses and meet the needs of people with different chest widths. Utility Model Content

[0005] To address the problems in the prior art, this utility model proposes an adjustable lumbar support chair, which effectively solves the problems of the inability to set the support force value of lumbar support devices and the inability to adjust the armpit support spacing in the prior art, thus meeting the needs of different users; at the same time, it also realizes the switching between support chair and seat working conditions, meeting the usage needs in different situations.

[0006] To achieve the above objectives, this utility model proposes an adjustable lumbar support chair, including a seat frame, a backrest on the seat frame, and a lifting plate slidably connected inside the backrest; both ends of the lifting plate are rotatably connected to vertical shafts, and each vertical shaft is equipped with a lumbar support mechanism; the lumbar support mechanism includes a support frame fixed to the vertical shaft, a movable telescopic rod slidably connected to the support frame, a movable sleeve fixed above the movable telescopic rod, a gas spring cylinder rotatably connected to the movable sleeve, and a fixed limiting arm slidably connected to the movable sleeve and the gas spring cylinder; a locking knob cooperating with the fixed limiting arm is connected to the gas spring cylinder, and a gas spring piston rod is slidably connected to the other end of the gas spring cylinder, the other end of the gas spring piston rod being slidably connected to the support frame; a movable adjustment rod is slidably connected inside the movable sleeve, and an armpit support is rotatably connected to the movable adjustment rod, with an armpit support positioning mechanism cooperating with the movable adjustment rod inside the armpit support.

[0007] Furthermore: the armpit support positioning mechanism includes a positioning gear coaxially fixed to the movable adjustment rod; a gear limiting block that slidably connects to the armpit support and cooperates with the positioning gear; a fixed sliding sleeve is fixedly connected to the armpit support; a positioning fixing post is fixedly connected to the fixed sliding sleeve; a through hole that cooperates with the positioning fixing post is provided on the gear limiting block; a return spring is sleeved on the positioning fixing post; one end of the return spring is fixedly connected to the fixed sliding sleeve; the other end of the return spring is fixedly connected to the gear limiting block; a positioning slider handle is slidably connected below the armpit support; the positioning slider handle is fixedly connected to the gear limiting block.

[0008] Furthermore: the movable adjusting rod is provided with a spring clip that cooperates with the movable sleeve; the movable sleeve is provided with a positioning hole that cooperates with the spring clip.

[0009] Furthermore: the fixed limiting crank arm is provided with a first sliding groove that mates with the gas spring cylinder body; the support frame is provided with a second sliding groove that mates with the gas spring piston rod.

[0010] Furthermore, both the first and second slide rails are arc-shaped slide rails, and the centers of the first and second slide rails are located at the rotational connection point between the gas spring cylinder and the movable sleeve.

[0011] Furthermore, the angle between the gas spring cylinder and the movable sleeve can be locked by a locking knob that cooperates with the fixed limit crank arm.

[0012] Furthermore, a lifting stud is rotatably connected inside the back plate and screwed to the lifting plate.

[0013] Furthermore: the upper surface of the armpit support is a concave arc shape.

[0014] Furthermore: the movable telescopic rod can be replaced with a second gas spring.

[0015] Furthermore, the fixed limit crank arm is equipped with a scale.

[0016] Compared with the prior art, the gain effect of this utility model is as follows:

[0017] 1. The lumbar support mechanism provides support for the user's armpits and stretches the lumbar spine. The support force can be adjusted by changing the angle between the gas spring cylinder and the movable sleeve, effectively solving the safety hazards caused by the inability to adjust or control the force value and the lack of buffer stroke, ensuring the user's comfort and safety during the support and stretching process.

[0018] 2. The rotating connection between the lifting plate and the vertical shaft enables adjustment of the armpit support position. With the assistance of the armpit support positioning mechanism, the armpit support can be adjusted to any angle, meeting the support needs and comfort of users with different shoulder widths.

[0019] 3. The lifting plate and the back panel are slidably connected, and the movable adjustment rod and the movable sleeve are slidably connected. With the cooperation of the two, the support needs of users of different heights are met.

[0020] 4. This utility model also realizes the switching between seat mode and support chair mode; the armpit support can be used as a regular armrest or as a support armpit support; meeting the usage needs in different situations. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present utility model.

[0022] Figure 2 This is a partial three-dimensional view of the present invention.

[0023] Figure 3 This is a partial structural side view of the present invention.

[0024] Figure 4 This is a perspective view of the armpit support positioning mechanism of this utility model.

[0025] Figure 5 This is the first state diagram of this utility model.

[0026] Figure 6 This is the second state diagram of this utility model.

[0027] Figure 7 This is the third state diagram of this utility model.

[0028] Figure 8 This is a partial enlarged view of the present invention.

[0029] In the diagram: 1. Seat frame, 2. Back plate, 3. Lifting plate, 4. Lifting stud, 5. Vertical shaft, 6. Support frame, 7. Gas spring piston rod, 8. Gas spring cylinder, 9. Locking knob, 10. Fixed limit crank arm, 11. Movable sleeve, 12. Movable telescopic rod, 13. Movable adjusting rod, 14. Positioning slider handle, 15. Armpit support, 16. Positioning gear, 17. Gear limit block, 18. Return spring, 19. Positioning fixing post, 20. Fixed sliding sleeve, 21. Second gas spring, 61. Second slide groove, 101. First slide groove. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0032] Example 1

[0033] An adjustable lumbar support chair includes a seat frame 1, a backrest 2 mounted on the seat frame 1, and a lifting plate 3 slidably connected within the backrest 2. Vertical shafts 5 are rotatably connected to both ends of the lifting plate 3, and lumbar support mechanisms are mounted on each vertical shaft 5. Each lumbar support mechanism includes a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 slidably connected to the support frame 6, a movable sleeve 11 fixed above the movable telescopic rod 12, and a gas spring cylinder 8 rotatably connected to the movable sleeve 11. A fixed limiting crank arm 10 is fixedly connected to the upper part of the gas spring cylinder body 8 and slidably connected to it; a locking knob 9 that cooperates with the fixed limiting crank arm 10 is connected to the upper part of the gas spring cylinder body 8; a gas spring piston rod 7 is slidably connected to the other end of the gas spring cylinder body 8; the other end of the gas spring piston rod 7 is slidably connected to the support frame 6; a movable adjusting rod 13 is slidably connected inside the movable sleeve 11; an armpit support 15 is rotatably connected to the movable adjusting rod 13; an armpit support positioning mechanism that cooperates with the movable adjusting rod 13 is provided inside the armpit support 15.

[0034] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjustment rod 13, and a gear limiting block 17 that slidably connects to the armpit support 15 and cooperates with the positioning gear 16; a fixed sliding sleeve 20 is fixedly connected to the armpit support 15, and a positioning fixing post 19 is fixedly connected to the fixed sliding sleeve 20; the gear limiting block 17 is provided with a through hole that cooperates with the positioning fixing post 19; a return spring 18 is sleeved on the positioning fixing post 19, one end of the return spring 18 is fixedly connected to the fixed sliding sleeve 20, and the other end of the return spring 18 is fixedly connected to the gear limiting block 17; a positioning slider handle 14 is slidably connected below the armpit support 15, and the positioning slider handle 14 is fixedly connected to the gear limiting block 17.

[0035] The movable adjusting rod 13 is provided with a spring clip that cooperates with the movable sleeve 11; the movable sleeve 11 is provided with a positioning hole that cooperates with the spring clip.

[0036] The angle between the gas spring cylinder and the movable sleeve can be locked by a locking knob that cooperates with the fixed limit crank arm.

[0037] The back plate 2 is rotatably connected to a lifting stud 4 that is screwed to the lifting plate 3.

[0038] The upper surface of the armpit support 15 is concave arc-shaped.

[0039] like Figure 1 , 2As shown in Figures 3 and 4: Under the action of the armpit support positioning mechanism, the armpit support 15 is positioned parallel to the fixed limiting arm 10. During this process, the positioning slider handle 14 is pulled outward first. The sliding of the positioning slider handle 14 can drive the gear limiting block 17 to slide. At this time, the gear limiting block 17 releases the limitation on the positioning gear 16. Then, the armpit support 15 is rotated. When the armpit support 15 is parallel to the fixed limiting arm 10, the positioning slider handle 14 is released. At this time, under the action of the return spring 18 in the fixed sliding sleeve 20, the gear limiting block 17 can be reset. In the reset state, the gear limiting block 17 can... The armpit support 15 is positioned by engaging with the positioning gear 16. The fixed sliding sleeve 20 and the positioning fixing column 19 ensure the stability of the gear limit block 17 during movement. Then, the lifting plate 3 is lowered to the lowest position by manually or by motor driving the lifting stud 4. At the same time, the height of the armpit support 15 can be adjusted by the spring clip on the movable adjusting rod 13 and the positioning hole on the movable sleeve 11, adjusting the armpit support 15 to the height of the seat armrest, thereby adjusting the present invention to the seat working condition. The present invention is easy to operate and comfortable to use, meeting the usage needs in different scenarios.

[0040] Example 2

[0041] An adjustable lumbar support chair includes a seat frame 1, a backrest 2 mounted on the seat frame 1, and a lifting plate 3 slidably connected within the backrest 2. Vertical shafts 5 are rotatably connected to both ends of the lifting plate 3, and lumbar support mechanisms are mounted on each vertical shaft 5. Each lumbar support mechanism includes a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 slidably connected to the support frame 6, a movable sleeve 11 fixed above the movable telescopic rod 12, and a gas spring cylinder 8 rotatably connected to the movable sleeve 11. A fixed limiting crank arm 10 is fixedly connected to the upper part of the gas spring cylinder body 8 and slidably connected to it; a locking knob 9 that cooperates with the fixed limiting crank arm 10 is connected to the upper part of the gas spring cylinder body 8; a gas spring piston rod 7 is slidably connected to the other end of the gas spring cylinder body 8; the other end of the gas spring piston rod 7 is slidably connected to the support frame 6; a movable adjusting rod 13 is slidably connected inside the movable sleeve 11; an armpit support 15 is rotatably connected to the movable adjusting rod 13; an armpit support positioning mechanism that cooperates with the movable adjusting rod 13 is provided inside the armpit support 15.

[0042] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjustment rod 13, and a gear limiting block 17 that slidably connects to the armpit support 15 and cooperates with the positioning gear 16; a fixed sliding sleeve 20 is fixedly connected to the armpit support 15, and a positioning fixing post 19 is fixedly connected to the fixed sliding sleeve 20; the gear limiting block 17 is provided with a through hole that cooperates with the positioning fixing post 19; a return spring 18 is sleeved on the positioning fixing post 19, one end of the return spring 18 is fixedly connected to the fixed sliding sleeve 20, and the other end of the return spring 18 is fixedly connected to the gear limiting block 17; a positioning slider handle 14 is slidably connected below the armpit support 15, and the positioning slider handle 14 is fixedly connected to the gear limiting block 17.

[0043] The fixed limiting crank arm 10 is provided with a first sliding groove 101 that cooperates with the gas spring cylinder 8; the support frame 6 is provided with a second sliding groove 61 that cooperates with the gas spring piston rod 7.

[0044] Both the first slide rail 101 and the second slide rail 61 are arc-shaped slide rails, and the centers of the first slide rail 101 and the second slide rail 61 are located at the rotational connection point between the gas spring cylinder 8 and the movable sleeve 11.

[0045] The angle between the gas spring cylinder and the movable sleeve can be locked by a locking knob that cooperates with the fixed limit crank arm.

[0046] The back plate 2 is rotatably connected to a lifting stud 4 that is screwed to the lifting plate 3.

[0047] The upper surface of the armpit support 15 is concave arc-shaped.

[0048] The fixed limit arm 10 is equipped with a scale.

[0049] like Figure 1 , 2 As shown in Figures 3, 4, and 5: Based on Embodiment 1, when the user needs support, the height of the lifting plate 3 can be adjusted by manually or by rotating the lifting stud 4 with a motor, thereby adjusting the overall height of the lumbar support mechanism. Then, the armpit support can be adjusted to a suitable height with the adjustment lever 13. Then, the locking knob 9 is loosened to release the limit between the gas spring cylinder 8 and the fixed limit arm 10. The angle between the gas spring cylinder 8 and the movable sleeve 11 can be adjusted as needed. When the gas spring cylinder 8 is rotated to a suitable position on the fixed limit arm 10, the support force is set and the locking knob 9 is tightened. At this time, the corresponding position of the gas spring piston rod 7 is also linked synchronously.

[0050] The magnitude of the supporting force can be determined by the angle between the gas spring cylinder 8 and the movable sleeve 11. If the design supporting force of the gas spring is F, the supporting force obtained by the armpit support 15 is N, and the angle between the gas spring cylinder 8 and the movable sleeve 11 is α, the supporting force N of the armpit support 15 can be obtained according to the formula N=F×cosα. Then cosα=N / F. The value of the angle α can be obtained by using the formula α=arccos(cosα)=arccosN / F.

[0051] Taking a gas spring with a supporting force of 260N installed on the outrigger as an example, the following table shows the correspondence between the four typical included angles α between the gas spring cylinder 8 and the movable sleeve 11 and the supporting force N, obtained using the formula α=arccosN / F:

[0052] serial number Support force N (approximate value) Angle α 1 260 0° 2 225 30° 3 184 45° 4 130 60°

[0053] When the user sets the support force, adjust the angle between the gas spring cylinder 8 and the movable sleeve 11 to the preset value, and tighten the locking knob 9 to lock it; for ease of use, convert and mark the scale inside the limiting crank arm 10 with the support force value corresponding to the angle (e.g., Figure 8 As shown, the user can select a suitable range according to their own weight; when the user applies a certain pressure to the armpit support 15, the gas spring piston rod 7 slides relative to the gas spring cylinder 8, and at the same time the movable sleeve 11 slides relative to the movable telescopic rod 12; simultaneously, the gas spring piston rod 7 slides in the second slide groove 61, forming a dynamic triangular structure with variable side length and constant angle, which not only ensures the smooth and stable operation of the mechanism, but also ensures that the armpit support 15 always receives constant support force, effectively solving the safety hazards caused by the inability to set the support force value and the lack of a buffer zone, and ensuring the user's comfort, safety and stable exercise and treatment effect during the support traction process.

[0054] Example 3

[0055] An adjustable lumbar support chair includes a seat frame 1, a backrest 2 mounted on the seat frame 1, and a lifting plate 3 slidably connected within the backrest 2. Vertical shafts 5 are rotatably connected to both ends of the lifting plate 3, and lumbar support mechanisms are mounted on each vertical shaft 5. Each lumbar support mechanism includes a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 slidably connected to the support frame 6, a movable sleeve 11 fixed above the movable telescopic rod 12, and a gas spring cylinder 8 rotatably connected to the movable sleeve 11. A fixed limiting crank arm 10 is fixedly connected to the upper part of the gas spring cylinder body 8 and slidably connected to it; a locking knob 9 that cooperates with the fixed limiting crank arm 10 is connected to the upper part of the gas spring cylinder body 8; a gas spring piston rod 7 is slidably connected to the other end of the gas spring cylinder body 8; the other end of the gas spring piston rod 7 is slidably connected to the support frame 6; a movable adjusting rod 13 is slidably connected inside the movable sleeve 11; an armpit support 15 is rotatably connected to the movable adjusting rod 13; an armpit support positioning mechanism that cooperates with the movable adjusting rod 13 is provided inside the armpit support 15.

[0056] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjustment rod 13, and a gear limiting block 17 that slidably connects to the armpit support 15 and cooperates with the positioning gear 16; a fixed sliding sleeve 20 is fixedly connected to the armpit support 15, and a positioning fixing post 19 is fixedly connected to the fixed sliding sleeve 20; the gear limiting block 17 is provided with a through hole that cooperates with the positioning fixing post 19; a return spring 18 is sleeved on the positioning fixing post 19, one end of the return spring 18 is fixedly connected to the fixed sliding sleeve 20, and the other end of the return spring 18 is fixedly connected to the gear limiting block 17; a positioning slider handle 14 is slidably connected below the armpit support 15, and the positioning slider handle 14 is fixedly connected to the gear limiting block 17.

[0057] The fixed limiting crank arm 10 is provided with a first sliding groove 101 that cooperates with the gas spring cylinder 8; the support frame 6 is provided with a second sliding groove 61 that cooperates with the gas spring piston rod 7.

[0058] Both the first slide rail 101 and the second slide rail 61 are arc-shaped slide rails, and the center of the first slide rail 101 and the second slide rail 61 is located at the rotational connection point between the gas spring cylinder 8 and the movable sleeve 11.

[0059] The angle between the gas spring cylinder and the movable sleeve can be locked by a locking knob that cooperates with the fixed limit crank arm.

[0060] The back plate 2 is rotatably connected to a lifting stud 4 that is screwed to the lifting plate 3.

[0061] The fixed limit arm 10 is equipped with a scale.

[0062] like Figure 1 , 2As shown in 3, 4 and 6: Based on Embodiment 1 and Embodiment 2, when the user's shoulder width is not suitable for the current support state, the support frame 6 can be rotated according to the user's needs to adjust to a position that matches the user's shoulder width, and then the armpit support 15 can be adjusted to a suitable angle to meet the usage needs of users with different shoulder widths.

[0063] Example 4

[0064] An adjustable lumbar support chair includes a seat frame 1, a backrest 2 mounted on the seat frame 1, and a lifting plate 3 slidably connected within the backrest 2. Vertical shafts 5 are rotatably connected to both ends of the lifting plate 3, and lumbar support mechanisms are mounted on each vertical shaft 5. Each lumbar support mechanism includes a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 slidably connected to the support frame 6, a movable sleeve 11 fixed above the movable telescopic rod 12, and a gas spring cylinder 8 rotatably connected to the movable sleeve 11. A fixed limiting crank arm 10 is fixedly connected to the upper part of the gas spring cylinder body 8 and slidably connected to it; a locking knob 9 that cooperates with the fixed limiting crank arm 10 is connected to the upper part of the gas spring cylinder body 8; a gas spring piston rod 7 is slidably connected to the other end of the gas spring cylinder body 8; the other end of the gas spring piston rod 7 is slidably connected to the support frame 6; a movable adjusting rod 13 is slidably connected inside the movable sleeve 11; an armpit support 15 is rotatably connected to the movable adjusting rod 13; an armpit support positioning mechanism that cooperates with the movable adjusting rod 13 is provided inside the armpit support 15.

[0065] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjustment rod 13, and a gear limiting block 17 that slidably connects to the armpit support 15 and cooperates with the positioning gear 16; a fixed sliding sleeve 20 is fixedly connected to the armpit support 15, and a positioning fixing post 19 is fixedly connected to the fixed sliding sleeve 20; the gear limiting block 17 is provided with a through hole that cooperates with the positioning fixing post 19; a return spring 18 is sleeved on the positioning fixing post 19, one end of the return spring 18 is fixedly connected to the fixed sliding sleeve 20, and the other end of the return spring 18 is fixedly connected to the gear limiting block 17; a positioning slider handle 14 is slidably connected below the armpit support 15, and the positioning slider handle 14 is fixedly connected to the gear limiting block 17.

[0066] The fixed limiting crank arm 10 is provided with a first sliding groove 101 that cooperates with the gas spring cylinder 8; the support frame 6 is provided with a second sliding groove 61 that cooperates with the gas spring piston rod 7.

[0067] Both the first slide rail 101 and the second slide rail 61 are arc-shaped slide rails, and the center of the first slide rail 101 and the second slide rail 61 is located at the rotational connection point between the gas spring cylinder 8 and the movable sleeve 11.

[0068] The angle between the gas spring cylinder and the movable sleeve can be locked by a locking knob that cooperates with the fixed limit crank arm.

[0069] The back plate 2 is rotatably connected to a lifting stud 4 that is screwed to the lifting plate 3.

[0070] The movable sleeve 11 and the movable telescopic rod 12 can be replaced with a second gas spring 21.

[0071] like Figure 1 , 2 As shown in Figures 3, 4, and 7: Based on Embodiments 2 and 3, when the movable telescopic rod 12 is replaced with a gas spring, if the supporting force of the gas spring is N1, then the supporting force of the armpit support 15 is N+N1. This scheme can still ensure that the supporting force is adjustable and constant, while also reducing the adjustment error.

[0072] The inventor hereby explains that the elastic support element selected in this utility model is a gas spring, because gas springs have the following significant advantages compared with ordinary springs: slow and stable running speed, nearly linear elastic curve, and force value that remains basically unchanged within the stroke range.

[0073] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. An adjustable lumbar support chair, comprising a seat frame (1), a backrest (2) disposed on the seat frame (1), and a lifting plate (3) slidably connected within the backrest (2); characterized in that: The lifting plate (3) is rotatably connected to vertical shafts (5) at both ends, and lumbar support mechanisms are provided on each vertical shaft (5). The lumbar support mechanism includes a support frame (6) fixed to the vertical shaft (5), a movable telescopic rod (12) slidably connected to the support frame (6), a movable sleeve (11) fixed above the movable telescopic rod (12), a gas spring cylinder (8) rotatably connected to the movable sleeve (11), and a fixed limiting crank arm (1) slidably connected to the gas spring cylinder (8) fixed to the movable sleeve (11). 0); A locking knob (9) that cooperates with the fixed limiting crank arm (10) is connected to the gas spring cylinder (8). The other end of the gas spring cylinder (8) is slidably connected to the gas spring piston rod (7). The other end of the gas spring piston rod (7) is slidably connected to the support frame (6). A movable adjusting rod (13) is slidably connected inside the movable sleeve (11). An armpit support (15) is rotatably connected to the movable adjusting rod (13). An armpit support positioning mechanism that cooperates with the movable adjusting rod (13) is provided inside the armpit support (15).

2. The adjustable lumbar support chair according to claim 1, characterized in that: The armpit support positioning mechanism includes a positioning gear (16) coaxially fixed to the movable adjustment rod (13), a gear limiting block (17) that cooperates with the positioning gear (16) is slidably connected inside the armpit support (15); a fixed sliding sleeve (20) is fixedly connected inside the armpit support (15), a positioning fixing post (19) is fixedly connected inside the fixed sliding sleeve (20), and a through hole that cooperates with the positioning fixing post (19) is provided on the gear limiting block (17); a return spring (18) is sleeved on the positioning fixing post (19), one end of the return spring (18) is fixedly connected to the fixed sliding sleeve (20), and the other end of the return spring (18) is fixedly connected to the gear limiting block (17); a positioning slider handle (14) is slidably connected below the armpit support (15), and the positioning slider handle (14) is fixedly connected to the gear limiting block (17).

3. The adjustable lumbar support chair according to claim 1, characterized in that: The movable adjusting rod (13) is provided with a spring clip that cooperates with the movable sleeve (11); the movable sleeve (11) is provided with a positioning hole that cooperates with the spring clip.

4. The adjustable lumbar support chair according to claim 1, characterized in that: The fixed limiting crank arm (10) is provided with a first slide groove (101) that cooperates with the gas spring cylinder (8); the support frame (6) is provided with a second slide groove (61) that cooperates with the gas spring piston rod (7).

5. The adjustable lumbar support chair according to claim 4, characterized in that: Both the first and second slides are arc-shaped slide rails, and the centers of the first and second slides are located at the rotational connection point between the gas spring cylinder (8) and the movable sleeve (11).

6. The adjustable lumbar support chair according to claim 1, characterized in that: The angle between the gas spring cylinder (8) and the movable sleeve (11) can be locked by the locking knob (9) that cooperates with the fixed limit crank arm (10).

7. The adjustable lumbar support chair according to claim 1, characterized in that: The back plate (2) is rotatably connected to a lifting stud (4) that is screwed to the lifting plate (3).

8. The adjustable lumbar support chair according to claim 1, characterized in that: The upper surface of the armpit support (15) is concave arc-shaped.

9. The adjustable lumbar support chair according to claim 1, characterized in that: The movable telescopic rod (12) can be replaced with a second gas spring (21).

10. The adjustable lumbar support chair according to claim 1, characterized in that: The fixed limit crank arm (10) is equipped with a scale.

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