Adjustable lumbar vertebra supporting seat

Abstract

The invention 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] The invention relates to the technical field of lumbar vertebra support, in particular to an adjustable lumbar vertebra support chair. Background Art

[0002] Lumbar support traction is an effective method to relieve and treat common lumbar spondylosis. The principle of this treatment method is to use external force to widen the distance between the human lumbar vertebrae, so that the protruding nucleus pulposus can be repositioned to a certain extent, thereby reducing or eliminating the pressure of the nucleus pulposus on the nerve roots, so that the user's waist and leg pain can be quickly reduced or eliminated.

[0003] Existing lumbar support traction mainly uses horizontal traction beds or support frames, waist-abdomen traction support devices, upper arm hanging traction devices, etc.; among them, the lower end force point of the supine traction method is located at the upper end of the hip bone, and a pulling force is applied to the lower part of the human body through a connected traction belt, and the other end uses a chest strap to tighten around the chest, and a pulling force is applied to the upper part of the human body through the connected traction belt. In order to prevent the chest strap from slipping and displacing, the binding force must be very large, which causes a great pressure on the chest and ribs. The discomfort during the binding and traction process is mainly squeezing pain and difficulty breathing, and female users are more difficult to bear the pressure on the chest; another abdominal support type traction method adopts a lower end using a waist strap to tighten around the upper end of the hip bone, and an upper end using an abdominal strap. This strap is tightened around the lower end of the ribs, and a retractable support device is arranged on the left and right sides of the two straps. The support force is adjusted by using a double-headed screw nut, and a traction force is generated on the lumbar spine by adjusting the length of the support device. When a large support force is applied, it will cause more serious discomfort. There are also similar devices that use axillary supports as support, but the supporting force is applied in a rigid manner, which makes the supporting force value uncontrollable, and therefore there are certain safety hazards.

[0004] The patent number is CN219963204U, and the patent name is "A Lumbar Traction Chair". It discloses a lumbar traction chair, including a seat body, a lifting frame is arranged at the rear side of the seat body, underarm fixing belts are fixedly arranged on both sides of the lifting frame, and the underarm fixing belts are symmetrically arranged. Underarm supporting devices symmetrically arranged on the tops of both sides of the lifting frame are symmetrically connected with the underarm supporting devices with threads rotating thereon; lower fixing belts are fixedly arranged on both sides of the seat body, and the lower fixing belts are symmetrically arranged; the present invention fixes the human chest by the underarm fixing belts; the underarm supporting device limits the human shoulders; the lower fixing belts fix the human buttocks, so that the human body is in a state of traction and stretching; this technical solution The same rigid mechanical support method also has the risk of uncontrollable support force values. If the upward lifting stroke is not properly controlled, the support force on the lumbar spine will increase dramatically, which increases the risk of violent strain on the lumbar spine. Public literature records that the appropriate lumbar support pulling force is 20-50 kg, and different support forces should be set according to the individual circumstances of the user. There are also some public multi-functional support and traction seat technical solutions, among which the disclosed rehabilitation and health care support or multi-purpose seat technical solutions for office and home use claim that they can be used as seats and lumbar support chairs, but the armrest spacing cannot be adjusted; therefore, it is impossible to achieve conversion between uses and meet the needs of people with different chest widths. Summary of the invention

[0005] In order to solve the problems in the background technology, the present invention proposes an adjustable lumbar support seat, which effectively solves the problems in the prior art that the supporting force value of the lumbar support device cannot be set and the armpit support spacing cannot be adjusted, thereby meeting the needs of different users; at the same time, it also realizes the switching of the support chair and the seat working conditions, thereby meeting the usage needs in different situations.

[0006] To achieve the above-mentioned purpose, the present invention proposes an adjustable lumbar support chair, comprising a seat frame, a back plate is arranged on the seat frame, and a lifting plate is slidably connected in the back plate; the left and right ends of the lifting plate are rotatably connected with vertical shafts, and lumbar support mechanisms are arranged on the vertical shafts; the lumbar support mechanism comprises a support frame fixed on the vertical shaft, a movable telescopic rod is slidably connected to the support frame, a movable sleeve is fixed above the movable telescopic rod, a gas spring cylinder is rotatably connected to the movable sleeve, a fixed limiting crank arm slidably connected to the gas spring cylinder is fixed to the movable sleeve; a locking knob matching the fixed limiting crank arm is connected to the gas spring cylinder, a gas spring piston rod is slidably connected to the other end of the gas spring cylinder, and the other end of the gas spring piston rod is slidably connected to the support frame; a movable adjusting rod is slidably connected in the movable sleeve, an armpit support is rotatably connected to the movable adjusting rod, and an armpit support positioning mechanism matching the movable adjusting rod is arranged in the armpit support.

[0007] Furthermore: the armpit support positioning mechanism includes a positioning gear coaxially fixed to the movable adjusting rod, a gear limit block matching the positioning gear is slidably connected inside the armpit support; a fixed sleeve is fixed inside the armpit support, a positioning fixing column is fixed inside the fixed sleeve, and a through hole matching the positioning fixing column is provided on the gear limit block; a reset spring is connected outside the positioning fixing column, one end of the reset spring is fixed to the fixed sleeve, and the other end of the reset spring is fixed to the gear limit block, a positioning slider handle is slidably connected under the armpit support, and the positioning slider handle is fixed to the gear limit block.

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

[0009] Furthermore: a first slide groove matching with the gas spring cylinder body is arranged on the fixed limit crank arm; a second slide groove matching with the gas spring piston rod is arranged on the support frame.

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

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

[0012] Furthermore: a lifting stud which is screwed to the lifting plate is rotatably connected in the back plate.

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

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

[0015] Furthermore: a scale is arranged on the fixed limit crank arm.

[0016] Compared with the prior art, the gain effect of the present invention is:

[0017] 1. The armpit support of the lumbar support mechanism realizes the support for the user's armpits and the support and stretching of the user's lumbar spine. The size of the support force is adjusted by adjusting the angle between the gas spring cylinder and the movable sleeve, which effectively solves the safety hazards caused by the unadjustable and uncontrollable force value and the lack of buffer stroke, and ensures the comfort and safety of the user during the support and stretching process.

[0018] 2. The rotating connection between the lifting plate and the vertical axis realizes the adjustment of the armpit support position. At the same time, 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 is slidably connected to the back plate, 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. The present invention also realizes the switching between the seat working condition and the support chair working condition; the armpit rest can be used as an ordinary armrest or as a support armpit rest; it meets the usage requirements in different situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a stereogram of the present invention.

[0022] Figure 2 It is a three-dimensional diagram of the local structure of the present invention.

[0023] Figure 3 It is a side view of the local structure of the present invention.

[0024] Figure 4 It is a three-dimensional diagram of the armpit support positioning mechanism of the present invention.

[0025] Figure 5 This is the first state diagram of the present invention.

[0026] Figure 6 This is the second state diagram of the present invention.

[0027] Figure 7 This is the third state diagram of the present invention.

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

[0029] In the figure: 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 adjustment rod, 14. positioning slider handle, 15. armpit support, 16. positioning gear, 17. gear limit block, 18. reset spring, 19. positioning fixed column, 20. fixed sliding sleeve, 21. second gas spring, 61. second slide groove, 101. first slide groove. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0032] Embodiment 1

[0033] An adjustable lumbar support chair comprises a seat frame 1, a back plate 2 is arranged on the seat frame 1, a lifting plate 3 is slidably connected inside the back plate 2; both left and right ends of the lifting plate 3 are rotatably connected to vertical shafts 5, and lumbar support mechanisms are arranged on the vertical shafts 5; the lumbar support mechanism comprises a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 is slidably connected to the support frame 6, a movable sleeve 11 is fixed above the movable telescopic rod 12, a gas spring cylinder 8 is rotatably connected to the movable sleeve 11, and the movable sleeve 11 is rotatably connected to the gas spring cylinder 8. 1 is fixedly connected with a fixed limit crank arm 10 which is slidably connected with a gas spring cylinder 8; a locking knob 9 which matches with the fixed limit crank arm 10 is connected with the gas spring cylinder 8; a gas spring piston rod 7 is slidably connected with the other end of the gas spring cylinder 8; and the other end of the gas spring piston rod 7 is slidably connected with the support frame 6; a movable adjusting rod 13 is slidably connected in the movable sleeve 11, an axillary support 15 is rotatably connected to the movable adjusting rod 13, and an axillary support positioning mechanism which matches with the movable adjusting rod 13 is arranged in the axillary support 15.

[0034] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjusting rod 13, and a gear limit block 17 matching the positioning gear 16 is slidably connected in the armpit support 15; a fixed sleeve 20 is fixed in the armpit support 15, a positioning fixing column 19 is fixed in the fixed sleeve 20, and a through hole matching the positioning fixing column 19 is provided on the gear limit block 17; a reset spring 18 is connected to the outer sleeve of the positioning fixing column 19, one end of the reset spring 18 is fixed to the fixed sleeve 20, and the other end of the reset spring 18 is fixed to the gear limit block 17; a positioning slider handle 14 is slidably connected to the lower side of the armpit support 15, and the positioning slider handle 14 is fixed to the gear limit block 17.

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

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

[0037] A lifting stud 4 which is screwed to the lifting plate 3 is rotatably connected inside the back plate 2 .

[0038] The upper surface of the armpit support 15 is a concave arc shape.

[0039] like Figure 1 , 2, 3 and 4: under the action of the armpit support positioning mechanism, the armpit support 15 is positioned to a position parallel to the fixed limit crank arm 10. In this process, the positioning slider handle 14 is first pulled outward, and the sliding of the positioning slider handle 14 can drive the gear limit block 17 to slide. At this time, the gear limit block 17 releases the limit on the positioning gear 16, and then the armpit support 15 is rotated. When the armpit support 15 is parallel to the fixed limit crank arm 10, the positioning slider handle 14 is released. At this time, under the action of the reset spring 18 in the fixed sliding sleeve 20, the gear limit block 17 can be reset, and the gear limit block 17 is reset. The armpit support 15 can be engaged with the positioning gear 16 to realize the positioning of the armpit support 15; the fixed sliding sleeve 20 and the positioning fixing column 19 ensure the stability of the gear limit block 17 during the movement; then the lifting stud 4 is driven by manual or motor to rotate to lower the lifting plate 3 to the lowest position, and the height of the armpit support 15 can be adjusted by the spring pin on the movable adjusting rod 13 and the positioning hole on the movable sleeve 11, and the armpit support 15 is adjusted to the height of the seat armrest, thereby realizing the adjustment of the present invention to the seat working condition. The present invention is easy to operate and comfortable to use, and meets the use requirements in different scenarios.

[0040] Embodiment 2

[0041] An adjustable lumbar support chair comprises a seat frame 1, a back plate 2 is arranged on the seat frame 1, a lifting plate 3 is slidably connected inside the back plate 2; both ends of the lifting plate 3 are rotatably connected to vertical shafts 5, and a lumbar support mechanism is arranged on the vertical shafts 5; the lumbar support mechanism comprises a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 is slidably connected to the support frame 6, a movable sleeve 11 is fixed above the movable telescopic rod 12, a gas spring cylinder 8 is rotatably connected to the movable sleeve 11, and the movable sleeve 11 is rotatably connected to the gas spring cylinder 8. 1 is fixedly connected with a fixed limit crank arm 10 which is slidably connected with a gas spring cylinder 8; a locking knob 9 which matches with the fixed limit crank arm 10 is connected with the gas spring cylinder 8; a gas spring piston rod 7 is slidably connected with the other end of the gas spring cylinder 8; and the other end of the gas spring piston rod 7 is slidably connected with the support frame 6; a movable adjusting rod 13 is slidably connected in the movable sleeve 11, an axillary support 15 is rotatably connected to the movable adjusting rod 13, and an axillary support positioning mechanism which matches with the movable adjusting rod 13 is arranged in the axillary support 15.

[0042] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjusting rod 13, and a gear limit block 17 matching the positioning gear 16 is slidably connected in the armpit support 15; a fixed sleeve 20 is fixed in the armpit support 15, a positioning fixing column 19 is fixed in the fixed sleeve 20, and a through hole matching the positioning fixing column 19 is provided on the gear limit block 17; a reset spring 18 is connected to the outer sleeve of the positioning fixing column 19, one end of the reset spring 18 is fixed to the fixed sleeve 20, and the other end of the reset spring 18 is fixed to the gear limit block 17; a positioning slider handle 14 is slidably connected to the lower side of the armpit support 15, and the positioning slider handle 14 is fixed to the gear limit block 17.

[0043] The fixed limit crank arm 10 is provided with a first slide groove 101 matched with the gas spring cylinder body 8 ; the support frame 6 is provided with a second slide groove 61 matched with the gas spring piston rod 7 .

[0044] The first slide groove 101 and the second slide groove 61 are both arc-shaped slide rails, and the centers of the first slide groove 101 and the second slide groove 61 are both located at the rotation 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 matched with the fixed limit crank arm.

[0046] A lifting stud 4 which is screwed to the lifting plate 3 is rotatably connected inside the back plate 2 .

[0047] The upper surface of the armpit support 15 is a concave arc shape.

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

[0049] like Figure 1 , 2 , 3, 4 and 5: On the basis of embodiment 1, when the user needs support, the lifting stud 4 can be rotated manually or by a motor to drive the lifting plate 3 to adjust the height, thereby adjusting the overall height of the lumbar support mechanism, and then adjusting the movable adjusting rod 13 to adjust the armpit support to an appropriate height, and then loosening the locking knob 9 to release the limit between the gas spring cylinder body 8 and the fixed limit crank arm 10, and adjust the angle between the gas spring cylinder body 8 and the movable sleeve 11 as needed; when the gas spring cylinder body 8 is rotated to a suitable position on the fixed limit crank arm 10, the supporting 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 synchronously linked.

[0050] The size of the supporting force can be measured 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 set to N, and the angle between the gas spring cylinder 8 and the movable sleeve 11 is α, according to the formula N=F×cosα, the supporting force N of the armpit support 15 can be obtained, then cosα=N / F, and the formula α=arccos(cosα)=arccosN / F can be used to solve the value of the angle α.

[0051] Taking the gas spring with a supporting force of 260N installed on the support arm as an example, the corresponding relationship between the four typical angles α between the gas spring cylinder 8 and the movable sleeve 11 and the supporting force N is obtained by using the formula α=arccosN / F as shown in the following table:

[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, the angle between the gas spring cylinder 8 and the movable sleeve 11 is adjusted to a preset value, and the locking knob 9 is tightened to lock it; for ease of use, the scale in the limit crank arm 10 is converted and marked as the support force value corresponding to the angle (such as Figure 8 As shown, the user can select a suitable range according to his or her own weight); when the user's armpit applies a certain pressure to the armpit support 15, the gas spring piston rod 7 and the gas spring cylinder 8 slide relative to each other, and the movable sleeve 11 and the movable telescopic rod 12 slide relative to each other; at the same time, the gas spring piston rod 7 slides in the second slide groove 61 in a linked manner, and a dynamic triangle structure with variable side length and constant angle is formed at this time, which not only ensures the smooth and stable operation of the mechanism, but also ensures that the armpit support 15 always obtains a constant supporting force, effectively solves the safety hazard caused by the unsettable supporting force value and the absence of a buffer zone, and ensures the user's comfortable, safe and stable exercise and treatment effect during the support and traction process.

[0054] Embodiment 3

[0055] An adjustable lumbar support chair comprises a seat frame 1, a back plate 2 is arranged on the seat frame 1, a lifting plate 3 is slidably connected inside the back plate 2; both left and right ends of the lifting plate 3 are rotatably connected to vertical shafts 5, and lumbar support mechanisms are arranged on the vertical shafts 5; the lumbar support mechanism comprises a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 is slidably connected to the support frame 6, a movable sleeve 11 is fixed above the movable telescopic rod 12, a gas spring cylinder 8 is rotatably connected to the movable sleeve 11, and the movable sleeve 11 is rotatably connected to the gas spring cylinder 8. 1 is fixedly connected with a fixed limit crank arm 10 which is slidably connected with a gas spring cylinder 8; a locking knob 9 which matches with the fixed limit crank arm 10 is connected with the gas spring cylinder 8; a gas spring piston rod 7 is slidably connected with the other end of the gas spring cylinder 8; and the other end of the gas spring piston rod 7 is slidably connected with the support frame 6; a movable adjusting rod 13 is slidably connected in the movable sleeve 11, an axillary support 15 is rotatably connected to the movable adjusting rod 13, and an axillary support positioning mechanism which matches with the movable adjusting rod 13 is arranged in the axillary support 15.

[0056] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjusting rod 13, and a gear limit block 17 matching the positioning gear 16 is slidably connected in the armpit support 15; a fixed sleeve 20 is fixed in the armpit support 15, a positioning fixing column 19 is fixed in the fixed sleeve 20, and a through hole matching the positioning fixing column 19 is provided on the gear limit block 17; a reset spring 18 is connected to the outer sleeve of the positioning fixing column 19, one end of the reset spring 18 is fixed to the fixed sleeve 20, and the other end of the reset spring 18 is fixed to the gear limit block 17; a positioning slider handle 14 is slidably connected to the lower side of the armpit support 15, and the positioning slider handle 14 is fixed to the gear limit block 17.

[0057] The fixed limit crank arm 10 is provided with a first slide groove 101 matched with the gas spring cylinder body 8 ; the support frame 6 is provided with a second slide groove 61 matched with the gas spring piston rod 7 .

[0058] The first slide groove 101 and the second slide groove 61 are both arc-shaped slide rails, and the centers of the first slide groove 101 and the second slide groove 61 are located at the rotation 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 matched with the fixed limit crank arm.

[0060] A lifting stud 4 which is screwed to the lifting plate 3 is rotatably connected inside the back plate 2 .

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

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

[0063] Embodiment 4

[0064] An adjustable lumbar support chair comprises a seat frame 1, a back plate 2 is arranged on the seat frame 1, a lifting plate 3 is slidably connected inside the back plate 2; both ends of the lifting plate 3 are rotatably connected to vertical shafts 5, and lumbar support mechanisms are arranged on the vertical shafts 5; the lumbar support mechanism comprises a support frame 6 fixed to the vertical shaft 5, a movable telescopic rod 12 is slidably connected to the support frame 6, a movable sleeve 11 is fixed above the movable telescopic rod 12, a gas spring cylinder 8 is rotatably connected to the movable sleeve 11, and the movable sleeve 11 is rotatably connected to the gas spring cylinder 8. 1 is fixedly connected with a fixed limit crank arm 10 which is slidably connected with a gas spring cylinder 8; a locking knob 9 which matches with the fixed limit crank arm 10 is connected with the gas spring cylinder 8; a gas spring piston rod 7 is slidably connected with the other end of the gas spring cylinder 8; and the other end of the gas spring piston rod 7 is slidably connected with the support frame 6; a movable adjusting rod 13 is slidably connected in the movable sleeve 11, an axillary support 15 is rotatably connected to the movable adjusting rod 13, and an axillary support positioning mechanism which matches with the movable adjusting rod 13 is arranged in the axillary support 15.

[0065] The armpit support positioning mechanism includes a positioning gear 16 coaxially fixed to the movable adjusting rod 13, and a gear limit block 17 matching the positioning gear 16 is slidably connected in the armpit support 15; a fixed sleeve 20 is fixed in the armpit support 15, a positioning fixing column 19 is fixed in the fixed sleeve 20, and a through hole matching the positioning fixing column 19 is provided on the gear limit block 17; a reset spring 18 is connected to the outer sleeve of the positioning fixing column 19, one end of the reset spring 18 is fixed to the fixed sleeve 20, and the other end of the reset spring 18 is fixed to the gear limit block 17, and a positioning slider handle 14 is slidably connected below the armpit support 15, and the positioning slider handle 14 is fixed to the gear limit block 17.

[0066] The fixed limit crank arm 10 is provided with a first slide groove 101 matched with the gas spring cylinder body 8 ; the support frame 6 is provided with a second slide groove 61 matched with the gas spring piston rod 7 .

[0067] The first slide groove 101 and the second slide groove 61 are both arc-shaped slide rails, and the centers of the first slide groove 101 and the second slide groove 61 are located at the rotation 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 matched with the fixed limit crank arm.

[0069] A lifting stud 4 which is screwed to the lifting plate 3 is rotatably connected inside the back plate 2 .

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

[0071] like Figure 1 , 2 , 3, 4 and 7: On the basis of the second and third embodiments, when the movable telescopic rod 12 is replaced by a gas spring, if the supporting force of the gas spring is N1, the supporting force of the armpit support 15 is N+N1. This solution can still ensure that the supporting force is adjustable and constant, while also reducing the adjustment error.

[0072] The inventors would like to explain that the elastic support element selected for the present invention is a gas spring, because the gas spring has the following significant advantages over ordinary springs: slow and stable running speed, a nearly linear elastic curve, and the force value remains basically unchanged within the travel range.

[0073] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention; in addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0074] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

Claims

1. An adjustable lumbar support chair, comprising a seat frame (1), a back plate (2) being arranged on the seat frame (1), and a lifting plate (3) being slidably connected inside the back plate (2); characterized in that: The left and right ends of the lifting plate (3) are rotatably connected to vertical shafts (5), and the vertical shafts (5) are provided with lumbar support mechanisms; the lumbar support mechanisms include a support frame (6) fixedly connected to the vertical shaft (5), a movable telescopic rod (12) slidably connected to the support frame (6), a movable sleeve (11) fixedly connected above the movable telescopic rod (12), a gas spring cylinder (8) rotatably connected to the movable sleeve (11), and a fixed limit crank arm (11) slidably connected to the gas spring cylinder (8) fixedly connected to the movable sleeve (11). 0); a locking knob (9) matched with a fixed limit crank arm (10) is connected to 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 adjustment rod (13) is slidably connected in the movable sleeve (11); an axillary support (15) is rotatably connected to the movable adjustment rod (13); an axillary support positioning mechanism matched with the movable adjustment rod (13) is arranged in the axillary support (15).

2. The adjustable lumbar support seat according to claim 1, characterized in that: The armpit support positioning mechanism comprises a positioning gear (16) coaxially fixedly connected to the movable adjustment rod (13); a gear limit block (17) matching with the positioning gear (16) is slidably connected in the armpit support (15); a fixed sliding sleeve (20) is fixedly connected in the armpit support (15); a positioning fixing column (19) is fixedly connected in the fixed sliding sleeve (20); a through hole matching with the positioning fixing column (19) is arranged on the gear limit block (17); a reset spring (18) is connected to the outer surface of the positioning fixing column (19); one end of the reset spring (18) is fixedly connected to the fixed sliding sleeve (20), and the other end of the reset spring (18) is fixedly connected to the gear limit 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 limit block (17).

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

4. The adjustable lumbar support seat according to claim 1, characterized in that: A first slide groove (101) matching with the gas spring cylinder body (8) is arranged on the fixed limit crank arm (10); and a second slide groove (61) matching with the gas spring piston rod (7) is arranged on the support frame (6).

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

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

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

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

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

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

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