Lumbar support force adjustment mechanism and seat

Abstract

The utility model relates to the field of furniture technology, and more specifically to a lumbar support force adjustment mechanism and a seat, the lumbar support force adjustment mechanism comprising: a gas rod assembly, the gas rod assembly comprising a gas rod sleeve; a slider, which slides in a preset area, the slider is slidably connected to the seat cushion, and the slider is connected to the gas rod sleeve; an adjustment assembly, the adjustment assembly comprising an elastic member, an adjustment handle, and an elastic force adjustment drive assembly, one end of the elastic member abuts against the slider, and the elastic member is connected to the elastic force adjustment drive assembly, and the elastic force adjustment drive assembly is connected to the adjustment handle. The lumbar support force adjustment mechanism controls the elastic force adjustment drive assembly through the adjustment handle of the adjustment assembly, and then presses the elastic member against the lumbar support end, so that the slider abutted by the elastic member pushes the gas rod sleeve, thereby giving the gas rod sleeve a preset force, so that the lumbar support can be moved back more easily when a person with light weight sits on the seat and leans back on the lumbar support.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, and more specifically to a lumbar support force adjustment mechanism and a seat. Background Art

[0002] The lumbar support is a support cushion installed at the waist position of the seat, which is used to provide support for the user's waist. The lumbar support can reduce the pressure on the waist, thereby preventing the user from feeling fatigue and pain in the waist due to long-term sitting or poor sitting posture. The lumbar support connection structure is a structure used to adjust the movement of the lumbar support, that is, when the user leans on the lumbar support, the pressure of the user against the lumbar support is transmitted to the lumbar support connection structure through the lumbar support, and the lumbar support connection structure will move, thereby driving the lumbar support to move. For example, a lumbar support seat with patent number CN201711381616.8, the lumbar support in this patent uses a gas spring to move the lumbar support back and forth. When the user sits on the lumbar support seat and leans forward or backward, the lumbar support can move back and forth through the lumbar support connection structure.

[0003] However, the strength of the lumbar support connection structure in the prior art is fixed during production. Since different people apply different thrusts to the lumbar support when leaning on it, the difficulty of the lumbar support moving backward under the thrust is also different. For the existing lumbar support connection structure, when people who apply less thrust to the lumbar support lean on it, the lumbar support connection structure will not play a good role for them. Therefore, for these people, if they want to adjust the lumbar support to move backward through the lumbar support connection structure, they need to push the lumbar support backward with force, which brings a bad user experience.

[0004] The technical problem to be solved by the utility model is to facilitate the adjustment of the lumbar support connection structure of a seat to adapt to different seat users.

[0005] In summary, there is an urgent need for a lumbar support force adjustment mechanism that can be adjusted according to the weight of different people to solve the shortcomings of the existing technology. Utility Model Content

[0006] The utility model provides a lumbar support force adjustment mechanism, which sets an adjustment component, and the adjustment handle of the adjustment component controls the elastic force adjustment drive component, thereby pressing the elastic member to the lumbar support end, and the slider abutted by the elastic member pushes the gas rod sleeve, thereby giving the gas rod sleeve a preset force, so that: when a light person sits on the seat and leans back on the lumbar support, the lumbar support moves backward under the push of the user and the preset force.

[0007] The specific technical solutions adopted by the utility model to solve the above technical problems are as follows:

[0008] A lumbar support force adjustment mechanism, comprising:

[0009] A gas rod assembly, the gas rod assembly comprising a gas rod sleeve;

[0010] A slider slides in a preset area, the slider is slidably connected to the seat cushion, and the slider is connected to the gas rod sleeve;

[0011] The adjusting component includes an elastic member, an adjusting handle, and an elastic force adjusting driving component. One end of the elastic member abuts against the slider, and the elastic member is connected to the elastic force adjusting driving component, and the elastic force adjusting driving component is connected to the adjusting handle.

[0012] As a further preferred solution, the adjustment handle is connected to the elastic force adjustment drive assembly via a connecting piece.

[0013] Further as a preferred embodiment, the elastic force adjustment drive assembly includes a bevel gear transmission assembly, a screw rod and an elastic member pusher, the connecting member is connected to the bevel gear transmission assembly, the bevel gear transmission assembly is connected to the screw rod, an elastic member pusher is screwed on the screw rod, and the elastic member pusher is connected to the axial first end of the elastic member, and a limit sleeve is provided on the screw rod and close to the slider side, the axial second end of the elastic member abuts the limit sleeve, and the limit sleeve abuts the slider.

[0014] Further as a preferred solution, the elastic member pushing member includes a pushing portion and a clamping portion that push the elastic member, the elastic member is connected to the pushing portion, the pushing portion is connected to the clamping portion, and the clamping portion is slidably limitedly connected to the seat cushion limiting rib of the seat cushion.

[0015] Further as a preferred embodiment, the limit sleeve includes a limit part and a screw rod connecting part, the limit part is connected to the screw rod connecting part, both the limit part and the screw rod connecting part are provided with a through hole allowing the screw rod to pass through, the elastic member abuts against the limit part, the limit part abuts against the slider, and the screw rod connecting part is sleeved on the screw rod through the through hole and is slidably connected to the screw rod.

[0016] Further as a preferred embodiment, the bevel gear transmission assembly includes a rotating shaft, a large bevel gear, a small bevel gear and a bearing, the axial first end of the rotating shaft is connected to the connecting piece, the axial second end of the rotating shaft is connected to the large bevel gear, the large bevel gear and the small bevel gear are meshed with each other, the small bevel gear is connected to the bearing, and the screw is connected to the small bevel gear.

[0017] Further as a preferred embodiment, the small bevel tooth includes a first bevel tooth portion and a second bevel tooth portion, the large bevel tooth and the first bevel tooth portion are meshed with each other, the first bevel tooth portion is connected to the second bevel tooth portion, the second bevel tooth portion is connected to the bearing, and the second bevel tooth portion is provided with a through screw connecting hole, the first bevel tooth portion is provided with a threaded hole connected to the screw connecting hole, the screw is inserted into the screw connecting hole, and the screw fixing screw is passed through the threaded hole to fix the screw to the small bevel tooth.

[0018] As a further preferred solution, the large bevel gear is provided with a through hole for the shaft to pass through, and the shaft passes through the through hole and is fixed to the large bevel gear through a flat washer and a shaft fixing screw.

[0019] Further as a preferred solution, the slider includes two sliding parts and a gas rod sleeve connecting shaft, the gas rod sleeve connecting shaft is connected to the two sliding parts at the same time, and the gas rod sleeve connecting shaft is connected between the two sliding parts, the sliding part is connected to the lumbar support, and the gas rod sleeve is connected to the gas rod sleeve connecting shaft.

[0020] A seat comprises a lumbar support force adjustment mechanism as described above.

[0021] The main beneficial effects of the above technical solution are:

[0022] By setting an adjustment component in the above technical solution, the adjustment handle of the adjustment component is used to control the elastic force adjustment drive component, thereby pressing the elastic part toward the lumbar support end, so that the slider abutted by the elastic part pushes the gas rod sleeve, thereby giving the gas rod sleeve a preset force, which can make it easier for a person with light weight to move backwards when sitting in the seat and leaning back on the lumbar support.

[0023] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 This is a cross-sectional view of a lumbar support force adjustment mechanism installed on a seat cushion according to the utility model.

[0026] Figure 2 This is an enlarged schematic diagram of a cross-section of an adjustment component of a waist support force adjustment mechanism of the utility model. Figure 1 .

[0027] Figure 3 This is an enlarged schematic diagram of a cross-section of an adjustment component of a waist support force adjustment mechanism of the utility model. Figure 2 .

[0028] Figure 4 It is a partially enlarged stereoscopic diagram of a waist support force adjustment mechanism of the utility model.

[0029] As shown in the figure:

[0030] Gas rod assembly-1, gas rod sleeve-11, gas rod-12, gas rod core-13, slider-3, adjustment assembly-5, elastic part-51, adjustment handle-52, elastic force adjustment drive assembly-53, bevel gear transmission assembly-532, rotating shaft-5321, large bevel gear-5322, small bevel gear-5323, bearing-5324, screw rod-534, elastic part pushing member-535, limiting sleeve-a, limiting part-a1, screw rod connecting part-a2, cushion-F, cushion limiting rib-C. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the specific implementation of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the implementation of the utility model.

[0032] A waist support strength adjustment mechanism, as shown in the attached Figure 1 To Attachment Figure 4 As shown, the lumbar support force adjustment mechanism includes: a gas rod assembly 1, a slider 3 and an adjustment assembly 5, the gas rod assembly 1 includes a gas rod sleeve 11, and the adjustment assembly 5 includes an elastic member 51, an adjustment handle 52, and an elastic force adjustment drive assembly 53.

[0033] Specifically, as attached Figure 1 To Attachment Figure 4 As shown, the adjustment component 5 is in contact with the slider 3, and the slider 3 is connected to the gas rod component 1. At the same time, the slider 3 is also connected to the lumbar support on the rear side of the seat cushion F. The lumbar support is not shown in the figure. The slider 3 slides in a preset area under the push of the gas rod component 1 or the adjustment component 5. Specifically, the gas rod component 1 includes a gas rod core 13, a gas rod 12 and a gas rod sleeve 11. The axial first end of the gas rod core 13 is connected to the seat cushion F, and the axial second end of the gas rod core 13 is connected to the gas rod 12. The gas rod sleeve 11 is provided on the outer sleeve of the gas rod 12. The gas rod sleeve 11 is connected to the axial first end of the slider 3. The adjustment component 5 is in contact with the axial second end of the slider 3. The slider 3 is slidably connected to the seat cushion F, and the slider 3 slides in the preset area under the push of the gas rod sleeve 11 or the adjustment component 5. When the user sits on the cushion F and moves backward against the lumbar support, the slider 3 connected to the lumbar support will slide backward to push the gas rod sleeve 11, and the gas in the gas rod 12 will be compressed during the backward movement of the gas rod sleeve 11; when the user sits on the cushion F and leans forward against the lumbar support, the compressed gas in the gas rod 12 will push the gas rod sleeve 11 forward, so that the gas rod sleeve 11 pushes the slider 3 to slide forward, and then the lumbar support connected to the slider 3 moves in the reset direction to support the user's waist. It should be noted that, as shown in the attached figure, Figure 1As shown, the direction backward is the horizontal direction of the lumbar support, and the direction forward is the opposite horizontal direction of the lumbar support. Specifically, one end of the elastic member 51 of the adjustment assembly 5 is in contact with the second axial end of the slider 3, and the elastic member 51 is connected to the elastic force adjustment drive assembly 53, and the elastic force adjustment drive assembly 53 is connected to the adjustment handle 52. Then, the user adjusts the elastic member 51 by rotating the adjustment handle 52, so that the elastic member 51 is pressed and gives a backward thrust to the slider 3 under the drive of the elastic force adjustment drive assembly 53. Since the slider 3 slides within a preset range, the preset range setting needs to meet the requirement that when the slider 3 slides to the rear end, the elastic member 51 is still in a compressed state. When the elastic member 51 pushes the slider 3 to move to the end closest to the lumbar support in the preset area, since the elastic member 51 is still in a compressed state and the elastic member 51 is always in contact with the slider 3, the elastic member 51 always has a thrust on the slider 3. Since the slider 3 is connected to the lumbar support, the slider 3 will push the lumbar support to move backward. Among them, the adjustment handle 52 is a ring handle. The handle 52 is adjusted by rotating it according to the thrust of the lumbar support applied by the user, so that the elastic member 51 is compressed, thereby exerting a force to push the slider 3 backward. The elastic member 51 is a spring. It should be noted that the maximum thrust of the selected gas rod assembly 1 needs to be greater than the maximum elastic force of the selected elastic member 51, so as to prevent the lumbar support from being hindered by the elastic member 51 when the user's body leans forward. For example, if the thrust of the gas rod assembly 1 used in the seat is 360N, the elastic force of the elastic member 51 needs to be less than 360N. Finally, the method for the user to use the adjustment component 5 to assist in pushing the lumbar support is that the user sits on the seat and leans against the lumbar support. If the user finds that the lumbar support cannot be pushed backward or is difficult to push backward by the pressure of his or her waist on the lumbar support, he or she can rotate the adjustment handle 52 to adjust the elastic member 51, and then lean on the lumbar support to feel whether the lumbar support can be easily moved backward under the support of the waist. If not, continue to rotate the adjustment handle 52 to further compress the spring until the user can push the lumbar support backward only by the pressure of his or her waist on the lumbar support without the need for the user's waist to push the lumbar support backward.

[0034] In this embodiment, by providing the adjustment component 5, the adjustment component 5 is in contact with the slider 3, and the adjustment component 5 gives the slider 3 a preset force, so that the forward and backward movement can be adjusted according to people of different weights, which solves the problem that the waist of the user with a light weight has a small pushing force on the waist support during the process of leaning back, so it is difficult to push the waist support, or it is difficult to push the waist support. It can also solve the needs of people with a heavy weight to use the waist support.

[0035] Furthermore, the adjustment handle 52 is connected to the elastic force adjustment drive assembly 53 via a connecting piece.

[0036] Specifically, the connecting member is a latch, one end of which is connected to the adjustment handle 52 , and the other end of which is connected to the elastic force adjustment drive assembly 53 .

[0037] Furthermore, the elastic force adjustment drive assembly 53 includes a bevel gear transmission assembly 532, a screw rod 534 and an elastic member pusher 535. The connecting piece is connected to the bevel gear transmission assembly 532, and the bevel gear transmission assembly 532 is connected to the screw rod 534. The elastic member pusher 535 is screwed on the screw rod 534, and the elastic member pusher 535 is connected to the axial first end of the elastic member 51, and a limit sleeve a is provided on the screw rod 534 and close to the slider 3. The axial second end of the elastic member 51 abuts against the limit sleeve a, and the limit sleeve a abuts against the slider 3.

[0038] Specifically, as attached Figure 1 , Attachment Figure 2 , Attachment Figure 4 As shown, the elastic force adjustment driving assembly 53 is connected to the adjustment handle 52, and the rotation of the adjustment handle 52 drives the elastic force adjustment driving assembly 53 to press the elastic member 51. The elastic force adjustment driving assembly 53 includes a bevel gear transmission assembly 532, a screw rod 534 and an elastic member pusher 535. The connecting member is connected to the bevel gear transmission assembly 532, and the bevel gear transmission assembly 532 is connected to the screw rod 534. The elastic member pusher 535 is screwed on the screw rod 534, and the elastic member pusher 535 is connected to the axial first end of the elastic member 51, and a limiting sleeve a is provided on the screw rod 534 and close to the slider 3. The axial second end of the elastic member 51 abuts against the limiting sleeve a, and the limiting sleeve a abuts against the slider 3. When the adjustment handle 52 is rotated, since the connecting piece connected to the adjustment handle 52 is also connected to the bevel gear transmission assembly 532, the adjustment handle 52 drives the bevel gear transmission assembly 532 to transmit, and the bevel gear transmission assembly 532 drives the elastic member pusher 535 to push the elastic member 51 sleeved on the screw rod 534, thereby pressing or stretching the elastic member 51. The elastic member pusher 535 includes a pushing portion and a clamping portion for pushing the elastic member 51, the elastic member 51 is connected to the pushing portion, the pushing portion is connected to the clamping portion, and the clamping portion is slidably limitedly connected to the cushion limiting rib C of the cushion F, and the clamping portion prevents the pushing portion from rotating with the rotation of the screw rod 534, ensuring that the pushing portion can only move forward and backward on the screw rod 534.

[0039] Furthermore, the limiting sleeve a includes a limiting portion a1 and a screw rod connecting portion a2, the limiting portion a1 is connected to the screw rod connecting portion a2, the limiting portion a1 and the screw rod connecting portion a2 are both provided with a through hole allowing the screw rod 534 to pass through, the elastic member 51 abuts against the limiting portion a1, the limiting portion a1 abuts against the slider 3, and the screw rod connecting portion a2 is sleeved on the screw rod 534 through the through hole and is slidably connected to the screw rod 534.

[0040] Specifically, as attached Figure 4As shown, the limiting sleeve a is sleeved on the screw rod 534 and moves with the rotation of the screw rod 534. When the limiting sleeve a moves backward to the maximum position, the screw rod connecting portion a2 of the limiting sleeve a is still connected to the screw rod 534 to ensure that the limiting portion a1 of the limiting sleeve a is always in contact with the slider 3.

[0041] Furthermore, the bevel gear transmission assembly 532 includes a rotating shaft 5321, a large bevel gear 5322, a small bevel gear 5323 and a bearing 5324, the axial first end of the rotating shaft 5321 is connected to the connecting piece, the axial second end of the rotating shaft 5321 is connected to the large bevel gear 5322, the large bevel gear 5322 and the small bevel gear 5323 are meshed with each other, the small bevel gear 5323 is connected to the bearing 5324, and the screw rod 534 is connected to the small bevel gear 5323.

[0042] Specifically, as attached Figure 3 As shown, the connecting member is simultaneously connected to the adjustment handle 52 and the axial first end of the rotating shaft 5321, the rotating shaft 5321 is simultaneously connected to the connecting member and the large bevel gear 5322, the small bevel gear 5323 is connected to the bearing 5324, and the large bevel gear 5322 and the small bevel gear 5323 are meshed with each other. Thus, when the adjustment handle 52 is rotated, the rotating shaft 5321 will rotate, and the rotation of the rotating shaft 5321 will drive the large bevel gear 5322 connected to the rotating shaft 5321 to rotate, and the rotation of the large bevel gear 5322 will drive the small bevel gear 5323 meshed with the large bevel gear 5322 to rotate, and the rotation of the small bevel gear 5323 will drive the screw rod 534 connected to the small bevel gear 5323 to rotate.

[0043] Furthermore, the small bevel tooth 5323 includes a first bevel tooth portion and a second bevel tooth portion, the large bevel tooth 5322 is meshed with the first bevel tooth portion, the first bevel tooth portion is connected to the second bevel tooth portion, the second bevel tooth portion is connected to the bearing 5324, and the second bevel tooth portion is provided with a through screw connecting hole, the first bevel tooth portion is provided with a threaded hole connected to the screw connecting hole, the screw 534 is inserted into the screw connecting hole, and the screw fixing screw is passed through the threaded hole to fix the screw 534 to the small bevel tooth 5323.

[0044] Specifically, as attached Figure 3 As shown, the bearing 5324 is sleeved on the outer side of the second bevel gear portion of the small bevel gear 5323 to support and limit the small bevel gear 5323. If viewed from a top view, the second bevel gear portion of the small bevel gear 5323 overlaps with the bearing 5324. The second bevel gear portion of the small bevel gear 5323 is connected to the first bevel gear portion, and the first bevel gear portion of the small bevel gear 5323 is meshed with the large bevel gear 5322. When the adjustment handle 52 controls the rotation shaft 5321 to rotate, the large bevel gear 5322 rotates, thereby driving the small bevel gear 5323 supported by the bearing 5324 to rotate.

[0045] Furthermore, the large bevel gear 5322 is provided with a through hole for the rotating shaft 5321 to pass through, and the rotating shaft 5321 passes through the through hole and is fixed to the large bevel gear 5322 by a flat washer and a shaft fixing screw.

[0046] Specifically, in order to facilitate the connection between the rotating shaft 5321 and the large bevel tooth 5322, a through hole allowing the rotating shaft 5321 to pass through is opened in the large bevel tooth 5322. After the end of the rotating shaft 5321 that is not connected to the adjusting handle 52 passes through the through hole of the large bevel tooth 5322, the end of the rotating shaft 5321 that is not connected to the adjusting handle 52 is fixed to the large bevel tooth 5322 with a flat washer and a fixing screw. In this way, when the adjusting handle 52 controls the rotating shaft 5321 to rotate, the large bevel tooth 5322 can rotate with the rotating shaft 5321.

[0047] Furthermore, the slider 3 includes two sliding parts and a gas rod sleeve connecting shaft, the gas rod sleeve connecting shaft is connected to the two sliding parts at the same time and the gas rod sleeve connecting shaft is connected between the two sliding parts, the sliding part is connected to the waist support, and the gas rod sleeve 11 is connected to the gas rod sleeve connecting shaft.

[0048] Specifically, as attached Figure 4 As shown, the sliding part of the slider 3 is a plate-shaped body, and the two sliding parts are placed in parallel. The gas rod sleeve 11 is first connected to the gas rod sleeve connecting shaft, and then the two ends of the gas rod sleeve connecting shaft are simultaneously connected to the two sliding parts. The connecting part of the gas rod sleeve 11 and the gas rod sleeve connecting shaft is located between the two sliding parts. The sliding part of the slider 3 is connected to the waist support, which is not shown in the figure. When the user leans forward, the gas rod 12 will push the gas rod sleeve 11 to move forward, and then the gas rod sleeve 11 will push the sliding part to slide forward, and the sliding part will drive the waist support to move forward, thereby supporting the user's waist; when the user leans back against the waist support, the sliding part is connected to the waist support, the waist support moves backward, the sliding part will slide backward, and the gas rod sleeve 11 connected to the sliding part will move backward.

[0049] A seat comprises a lumbar support force adjustment mechanism as described above.

[0050] Specifically, the seat is provided with a lumbar support force adjustment mechanism, through which the slider 3 of the lumbar support force adjustment mechanism is connected to the lumbar support of the seat, and the lumbar support force adjustment mechanism of the seat is installed under the seat cushion F of the seat, the slider 3 is slidably connected to the seat cushion F, and the slider 3 slides within a preset area, so that the seat can first adjust the preset force of the lumbar support connected to the slider 3 by the elastic member according to the weight of the user, so that people with lighter weight can push the lumbar support when leaning back on the lumbar support of the seat, so that the lumbar support can better support the user's waist. Therefore, by providing a lumbar support force adjustment mechanism, it is possible to adjust the preset pushing force of the lumbar support when people of different weights use the lumbar support.

[0051] In summary, through the above embodiments, when a person with a lighter weight leans on the lumbar support and leans back, the adjustment component provides a backward thrust to the slider 3, which in turn provides a preset backward thrust to the lumbar support, making it easier for the user to lean back on the lumbar support and move the lumbar support backward to support the user's waist.

[0052] The above are only preferred embodiments of the utility model, and do not limit the scope of the utility model. In addition, the terms "vertical", "lateral", "front", "rear", etc. mentioned in the embodiments of the utility model indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model. It should be further explained that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like in the description should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances. The utility model will be described in detail with reference to the drawings and in combination with the embodiments.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lumbar support force adjustment mechanism, characterized in that: include: A gas rod assembly (1), the gas rod assembly (1) comprising a gas rod sleeve (11); A sliding block (3) which slides in a preset area, the sliding block (3) being slidably connected to the seat cushion (F), and the sliding block (3) being connected to the gas rod sleeve (11); An adjustment component (5), the adjustment component (5) comprising an elastic member (51), an adjustment handle (52), and an elastic force adjustment drive component (53), one end of the elastic member (51) abutting against the slider (3), the elastic member (51) being connected to the elastic force adjustment drive component (53), and the elastic force adjustment drive component (53) being connected to the adjustment handle (52).

2. A lumbar support force adjustment mechanism according to claim 1, characterized in that: The adjustment handle (52) is connected to the elastic force adjustment drive assembly (53) via a connecting piece.

3. A waist support force adjustment mechanism according to claim 2, characterized in that: The elastic force adjustment drive assembly (53) comprises a bevel gear transmission assembly (532), a screw rod (534) and an elastic member pusher (535); the connecting member is connected to the bevel gear transmission assembly (532); the bevel gear transmission assembly (532) is connected to the screw rod (534); the elastic member pusher (535) is screwed onto the screw rod (534); the elastic member pusher (535) is connected to the axial first end of the elastic member (51); a limit sleeve (a) is provided on the screw rod (534) and close to the slider (3); the axial second end of the elastic member (51) is in contact with the limit sleeve (a); and the limit sleeve (a) is in contact with the slider (3).

4. A lumbar support force adjustment mechanism according to claim 3, characterized in that: The elastic member pushing member (535) comprises a pushing portion and a clamping portion for pushing the elastic member (51), the elastic member (51) is connected to the pushing portion, the pushing portion is connected to the clamping portion, and the clamping portion is slidably and limit-connected to a seat cushion limiting rib (C) of the seat cushion (F).

5. The lumbar support force adjustment mechanism according to claim 3, characterized in that: The limiting sleeve (a) comprises a limiting portion (a1) and a screw connecting portion (a2), the limiting portion (a1) being connected to the screw connecting portion (a2), the limiting portion (a1) and the screw connecting portion (a2) both being provided with a through hole allowing the screw (534) to pass through, the elastic member (51) being in contact with the limiting portion (a1), the limiting portion (a1) being in contact with the sliding block (3), and the screw connecting portion (a2) being sleeved on the screw (534) through the through hole and being slidably connected to the screw (534).

6. A waist support force adjustment mechanism according to claim 3, characterized in that: The bevel gear transmission assembly (532) comprises a rotating shaft (5321), a large bevel gear (5322), a small bevel gear (5323) and a bearing (5324); the axial first end of the rotating shaft (5321) is connected to the connecting member, the axial second end of the rotating shaft (5321) is connected to the large bevel gear (5322), the large bevel gear (5322) and the small bevel gear (5323) are meshed with each other, the small bevel gear (5323) is connected to the bearing (5324), and the screw rod (534) is connected to the small bevel gear (5323).

7. A waist support force adjustment mechanism according to claim 6, characterized in that: The small bevel tooth (5323) comprises a first bevel tooth portion and a second bevel tooth portion, the large bevel tooth (5322) is meshed with the first bevel tooth portion, the first bevel tooth portion is connected to the second bevel tooth portion, the second bevel tooth portion is connected to the bearing (5324), and the second bevel tooth portion is provided with a threaded hole passing therethrough, the first bevel tooth portion is provided with a threaded hole connected to the threaded hole, the threaded rod (534) is inserted into the threaded hole, and a threaded rod fixing screw is passed through the threaded hole to fix the threaded rod (534) to the small bevel tooth (5323).

8. The lumbar support force adjustment mechanism according to claim 6, characterized in that: The large bevel gear (5322) is provided with a through hole for the rotating shaft (5321) to pass through, and the rotating shaft (5321) passes through the through hole and is fixed to the large bevel gear (5322) via a flat washer and a shaft fixing screw.

9. The lumbar support force adjustment mechanism according to claim 1, characterized in that: The slider (3) comprises two sliding parts and a gas rod sleeve connecting shaft, the gas rod sleeve connecting shaft is connected to the two sliding parts at the same time and the gas rod sleeve connecting shaft is connected between the two sliding parts, the sliding part is connected to the waist support, and the gas rod sleeve (11) is connected to the gas rod sleeve connecting shaft.

10. A seat, characterized in that: It comprises the lumbar support force adjustment mechanism as described in any one of claims 1 to 9.

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