Adjusting device and waist rest

Abstract

The utility model discloses an adjusting device, namely a waist rest. The device comprises a base, a moving part and an operating part, the moving part is movably arranged in the base, and the operating part is rotationally installed on the base around the axis. The base is provided with an adjusting piece which can move towards or away from the moving piece to achieve locking or unlocking. An eccentric rotating part is arranged at the end, close to the adjusting part, of the operating part and is eccentric to the axis of the operating part, and when the operating part is rotated, the eccentric rotating part eccentrically rotates to drive the adjusting part to linearly move; when being far away from the moving part, the moving part can freely slide and adjust; according to the device, through simple linkage of the cam mechanism, switching between locking and unlocking can be completed only by slightly rotating the operating piece, operation is easy and rapid, and user experience is remarkably improved; the waist rest comprises a bearing piece and the adjusting device, the bearing piece is configured to bear the waist of the human body, the bearing piece is arranged on the moving piece, the moving piece is arranged on the base in a front-back sliding mode, and the bearing piece moves front and back along with sliding of the moving piece.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of furniture, especially a adjusting device and a lumbar support. BACKGROUND

[0002] With the continuous improvement of people's requirements for seat use experience, the function of flexibly adjusting the position and angle of each part of the seat becomes more and more important.

[0003] However, the traditional seat adjusting device has many problems; some adjusting devices are complex to operate, requiring users to spend a lot of time and effort to complete the adjusting and locking operations; some adjusting devices have complex structures and contain a large number of components, which not only increases the production cost and assembly difficulty, but also is prone to failure; too many components cooperate with each other, which is prone to wear and loosening during long-term use, resulting in a decrease in the stability and reliability of the adjusting device and affecting the overall service life of the seat.

[0004] In addition, the traditional adjusting device has a large volume, occupies a large space inside the seat, and limits the design and layout of the seat; in today's pursuit of lightweight and compactness of the seat, such a large-volume adjusting device obviously cannot meet the market demand. SUMMARY

[0005] To solve the above technical problems, the utility model first provides an adjusting device, which comprises a base, a moving part and an operating part; the moving part is movably arranged in the base, and the operating part is rotatably installed on the base about an axis; the base is provided with an adjusting part, which can move towards or away from the moving part to realize locking or unlocking; an eccentric rotating part is arranged on the end of the operating part close to the adjusting part, which is eccentric to the axis of the operating part; when the operating part is rotated, the eccentric rotating part rotates eccentrically to drive the adjusting part to move linearly; when moving towards the moving part, the adjusting part locks the moving part and the base; when moving away from the moving part, the moving part can be freely adjusted; the device only needs a small rotation of the operating part to complete the switching between locking and unlocking through the simple linkage of the cam mechanism, which is easy and fast to operate, significantly improves the user experience, has a compact and simple overall structure, reduces the number of components, reduces the production cost and assembly difficulty, saves the internal space of the seat, and meets the design requirements of lightweight; the innovative design solves the problems of the traditional seat adjusting device, such as complicated operation, complex structure and bulky size, and provides an efficient and reliable technical solution for the seat adjusting function.

[0006] Further, a lumbar support is provided, which comprises a supporting part and the above-mentioned adjusting device; the supporting part is configured to support the waist of a human body, and the supporting part is arranged on the moving part; the moving part is slidably arranged on the base, and the supporting part moves forward and backward with the sliding of the moving part; when unlocked, the supporting part can adaptively displace forward and backward, and when locked, the supporting part can stay at the current position for support; the user can arbitrarily switch between the two states.

[0007] The technical scheme of the utility model is as follows:

[0008] A kind of adjusting device, including base, moving part and operating part, moving part is movably arranged in base, operating part is rotatably arranged on base around its axis;Base is equipped with adjusting part towards or away from the movement of moving part, adjusting part is configured to lock moving part with base when moving towards moving part;The end of operating part close to adjusting part has eccentric rotating part, eccentric rotating part is linked with adjusting part, eccentric rotating part is configured to eccentric rotating when operating part rotates, and adjusting part is moved towards or away from moving part by eccentric rotating part.

[0009] Moving part and base slide, so that the component connected on moving part can also move together, so as to realize adjustment;Eccentric rotating part is eccentric to the axis of operating part, when operating part rotates, eccentric rotating part will produce displacement in addition to rotation, and the displacement can drive adjusting part to move, so that adjusting part completes the switching of locking and unlocking, which is very ingenious;Locking can be carried out by rotating operating part, the action amplitude is small, and the operation is simple, easy and fast, which is very convenient for users to use;The device has simple and compact overall structure, which is beneficial to production and application.

[0010] As preferred, adjusting part is equipped with transmission groove, eccentric rotating part is equipped with transmission pin, transmission pin is inserted in transmission groove;Transmission groove extends along the direction parallel to moving part. Eccentric rotating part is eccentric to the axis of operating part, when operating part rotates, eccentric rotating part produces displacement in height direction, and transmission pin can move in transmission groove and drive transmission part to slide up and down.

[0011] As preferred, adjusting part includes locking part and transmission part, locking part is arranged close to moving part, transmission part is linked with adjusting part, transmission elastic part is arranged between locking part and transmission part, and transmission part drives locking part to move towards or away from moving part through transmission elastic part when transmission part moves. Transmission elastic part can make locking part have delay locking function.

[0012] As preferred, locking part and transmission part are both equipped with sink groove, and the two sink grooves are oppositely arranged;Locking part and transmission part are both equipped with connecting groove, connecting groove is communicated with sink groove, and two ends of transmission elastic part are arranged in two connecting grooves and abut against end face of sink groove. When locking part is locked with locking part, transmission elastic part is compressed and pressed down, and transmission elastic part cannot make locking part disengage after recovering elongation, so transmission elastic part needs to be further lifted to pull up locking part upward;Since transmission elastic part also plays a role of pulling up locking part upward to disengage from tooth engagement, transmission elastic part cannot only abut against locking part and transmission part, but must be connected together;Moreover, this setting mode can make transmission elastic part more stably connected on locking part and transmission part.

[0013] As preferred, the moving part is provided with a locking part, the locking part comprises a plurality of first clamping teeth arranged along the front-rear direction, the locking part is provided with second clamping teeth, the first clamping teeth and the second clamping teeth are configured to be clamped with each other to lock the moving part; the number of the first clamping teeth is at least two. The transmission elastic part can give the locking part a compression force to move towards the locking part, so that the moving part can be fine-tuned and the first clamping teeth and the second clamping teeth can be directly engaged after alignment to complete the locking.

[0014] As preferred, the operating part is provided with a gear shifting protrusion, the gear shifting protrusion protrudes radially from the operating part, the base is provided with a gear part, the gear part comprises at least two gear shifting grooves, and the gear shifting protrusion is located in one of the gear shifting grooves and is switched in the gear shifting groove when the operating part rotates. The gear shifting protrusion and the gear shifting groove can keep the operating part in the rotated posture, provide operation stability and feedback feeling, and prevent misoperation.

[0015] As preferred, the gear part is hollow in the middle and forms an elastic piece near the operating part, and the gear shifting groove is arranged on the elastic piece. When the gear shifting protrusion is switched in the gear shifting groove, the elastic part will be self-deformed.

[0016] As preferred, the operating part is further provided with two standby protrusions, and the gear shifting protrusion and the standby protrusions are uniformly distributed along the circumference of the operating part. The standby protrusions can play the role of the gear shifting protrusion even if the gear shifting protrusion is away from the gear part due to misoperation.

[0017] As preferred, the base is provided with a sliding groove extending along the front-rear direction and a containing groove extending along the up-down direction, the moving part is slidingly arranged in the sliding groove, the adjusting part is slidingly arranged in the containing groove, and the containing groove is communicated with the sliding groove.

[0018] A waist support comprises a supporting part and the adjusting device as described above, the supporting part is configured to support the waist of a human body, and the supporting part is arranged on the moving part, the moving part is slidingly arranged on the base in the front-rear direction, and the supporting part moves forward and backward with the sliding of the moving part. When unlocked, the supporting part can be self-adaptively displaced forward and backward, and when locked, the supporting part can stay at the current position to be supported, and the two states can be switched at will by a user.

[0019] The design starting point, concept and beneficial effects of the utility model are as follows:

[0020] The moving part slides with the base, so that the components connected to the moving part can also move together, thereby achieving adjustment; the eccentric rotating part is eccentric to the axis of the operating part; when the operating part rotates, the eccentric rotating part not only rotates but also produces displacement, which can drive the adjusting part to move, so that the adjusting part completes the switching of locking and unlocking, which is very ingenious; as long as the operating part is rotated, locking can be performed, the action range is small, the operation is simple, easy and fast, and it is very convenient for users to use; the device has simple and compact overall structure, and is favorable for production and application. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 For the three-dimensional structure of the waist support in the embodiment of the utility model Figure 1 ;

[0022] Figure 2 For the three-dimensional structure of the waist support in the embodiment of the utility model Figure 2 ;

[0023] Figure 3 For the sectional view of the waist support in the embodiment of the utility model;

[0024] Figure 4 For the three-dimensional structure of the supporting part in the embodiment of the utility model;

[0025] Figure 5 For the three-dimensional structure of the moving part in the embodiment of the utility model;

[0026] Figure 6 For the three-dimensional structure of the base in the embodiment of the utility model;

[0027] Figure 7 For the three-dimensional structure of the base in the embodiment of the utility model;

[0028] Figure 8 For the three-dimensional structure of the base in the embodiment of the utility model;

[0029] Figure 9 For the three-dimensional structure of the base in the embodiment of the utility model; Figure 1 ;

[0030] Figure 10 For the three-dimensional structure of the base in the embodiment of the utility model; Figure 2 ;

[0031] Figure 11 For the sectional view of the front and rear adjusting assembly inside the waist support in the embodiment of the utility model; Figure 1 ;

[0032] Figure 12 The sectional view of the front and rear adjusting assembly in the waist rest in the embodiment of the utility model Figure 2 .

[0033] The reference signs are as follows: a supporting piece 1; a mounting rod 11; a mounting seat 12; a rotating groove 121; a rotating seat 13; an abutting boss 14; a moving piece 2; an insertion part 21; a recess 211; a rotating part 22; a limiting boss 23; a locking part 24; a first clamping tooth 241; a base 3; a first sliding groove 31; a second sliding groove 32; a containing groove 33; a mounting groove 34; a connecting seat 4; a first elastic piece 5; a blocking strip 6; an operating piece 8; an eccentric rotating part 81; a gear shifting protrusion 82; a standby protrusion 83; a transmission pin 84; a transmission piece 9; a transmission groove 91; a locking piece 10; a second clamping tooth 101; a sunken groove 15; a connecting groove 16; a transmission elastic piece 17; a gear piece 18; an elastic sheet 181; a gear shifting groove 182; a cover plate 19. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above purpose, features and advantages of the utility model, the following will be further described in detail in combination with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0036] In the description of the utility model, the terms 'first','second', 'third' and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] The specific embodiments of the utility model are as follows:

[0038] As shown in Figure 7 , 8 The utility model provides an adjusting device, including base 3, moving piece 2 and operating piece 8, moving piece 2 is movably arranged in base 3, and operating piece 8 is rotationally arranged on base 3 around the axis, and base 3 is provided with adjusting piece moving towards or away from moving piece 2, and adjusting piece is configured to lock moving piece 2 and base 3 when moving towards moving piece 2, and the end of operating piece 8 close to adjusting piece has eccentric rotating part 81, eccentric rotating part 81 is linked with adjusting piece, and eccentric rotating part 81 is configured to eccentric rotate and drive adjusting piece to move towards or away from moving piece 2 when operating piece 8 rotates.

[0039] The moving part 2 slides with the base 3, so that the components connected to the moving part 2 can also move together, thereby achieving adjustment; the eccentric rotating part 81 is eccentric to the axis of the operating part 8, and when the operating part 8 rotates, the eccentric rotating part 81 not only rotates but also moves, and the movement can drive the adjusting part to move, so as to complete the switching of locking and unlocking, which is very ingenious; as long as the operating part 8 is rotated, the locking can be performed, the action range is small, the operation is simple, easy and fast, and it is very convenient for users to use; the whole device has a simple and compact structure, which is beneficial to production and application.

[0040] The adjusting part can be a single part or an assembly, and in the embodiment, the adjusting part is an assembly, which includes the transmission part 9, the locking part 10 and the transmission elastic part 17.

[0041] The adjusting device is applied to a waist support, which includes a supporting part 1, a moving part 2, a base 3 and a connecting seat 4, the connecting seat 4 is configured to be connected to a seat, the base 3 is arranged on the connecting seat 4 to slide up and down, the moving part 2 is arranged on the base 3 to slide forward and backward, the supporting part 1 is arranged on the moving part 2 to rotate, and the supporting part 1 is configured to support the waist of a human body; the base 3 is provided with a first sliding groove 31 extending in the height direction at the rear part, the connecting seat 4 is arranged in the first sliding groove 31, and the height adjusting assembly is arranged between the base 3 and the connecting seat 4; the base 3 is provided with a sliding groove 32 extending in the front and back direction at the front part, the moving part 2 is arranged in the sliding groove 32 to slide, and the first elastic part 5 is arranged between the moving part 2 and the base 3 to give the moving part 2 a forward elastic force.

[0042] The supporting part 1 is used to fit and support the waist of a human body, and it can move in the front and back and up and down directions under the action of the moving part 2 and the base 3, and the supporting part 1 is arranged on the moving part 2 to rotate, so as to realize movement in multiple directions; the base 3 is a main component, one side of which is connected to the connecting seat 4, and the other side of which is arranged with the moving part 2, so as to integrate the functions of lifting, forward and backward sliding and rotation, thereby realizing a compact and simple structure, which can facilitate the producer and improve the user's experience, and the adjustment is flexible, so as to avoid the movement problems of complex mechanisms; the first elastic part 5 gives the moving part 2 a forward elastic force, which can make the supporting part 1 fit the waist of the user more closely, and also facilitate the supporting part 1 to adapt to the displacement following the forward and backward movement of the waist of the user.

[0043] Specifically, the moving piece 2, the base 3 and the connecting seat 4 are all block-shaped, and the combination of the three has a small overall volume, the size of the supporting piece 1 is much larger than that of the three, and the compact and small layout can be applied to various seats; the height adjusting assembly arranged between the base 3 and the connecting seat 4 is of a conventional structure, which will not be described here; the first sliding groove 31 is also provided with a blocking strip 6, which is inverted U-shaped, the blocking strip 6 limits the connecting seat 4 in the first sliding groove 31, and the blocking strip 6 is fixedly connected with the base 3. The rotating connection of the supporting piece 1 is as follows:

[0044] As shown in Figures 3-5 , the supporting piece 1 is of a frame structure, which includes a mounting rod 11 located at the lower part, the mounting rod 11 is provided with a mounting seat 12 and a rotating seat 13, the rotating seat 13 is located below the mounting seat 12, the mounting seat 12 protrudes upward from the mounting rod 11, the rotating seat 13 protrudes rearward from the mounting rod 11, and the rotating seat 13 is rotatably connected with the front part of the moving piece 2; the front part of the moving piece 2 includes an insertion part 21 and a rotating part 22, the rotating seat 13 is specifically connected with the rotating part 22, and the rotating part 22 has an arc surface to adapt to rotation; the mounting seat 12 is provided with a rotating groove 121 which is open rearward, the insertion part 21 is inserted in the rotating groove 121, the front end face of the insertion part 21 is provided with a recess 211 which is recessed rearward, a second elastic piece (not shown) which gives the supporting piece 1 a forward elastic force is arranged between the supporting piece 1 and the moving piece 2, the second elastic piece is specifically arranged in the recess 211 and the rotating groove 121, and the two ends of the second elastic piece respectively abut against the end faces of the recess 211 and the rotating groove 121; the forward elastic force of the second elastic piece makes the supporting piece 1 be able to rotate and reset, and also makes the supporting piece 1 better fit the human waist after being rotated rearward, and adapt to the inclination of the human waist; the arrangement of the rotating groove 121 and the recess 211 also serves to arrange the second elastic piece, which hides and protects the second elastic piece, and achieves two purposes at once; in addition, there is a gap between the front end face of the rotating groove 121 and the front end face of the moving piece 2 to avoid the rearward rotation of the supporting piece 1; the arrangement of the rotating groove 121 makes the rotation of the supporting piece 1 and the moving piece 2 more closely, and improves the stability; the rotation point of the supporting piece 1 is downward, which makes the overall rearward rotation of the supporting piece 1 more obvious, the user's feeling is also more obvious, and the comfortable adaptive close-to-waist is truly provided.

[0045] The rotational connection point between the support member 1 and the moving member 2 is located below the second elastic member and also below the rotating groove 121. The rotating part 22 has a limiting boss 23 protruding downwards. Under the action of the second elastic member, the support member 1 abuts against the limiting boss 23. The support member 1 has two rotating seats 13, which sandwich the rotating part 22 in the middle. A contact boss 14 protrudes backwards between the two rotating seats 13. The contact boss 14 abuts against the limiting boss 23 to limit the rotation of the support member 1. At this time, the support member 1 is in its initial state, and the user's waist is roughly vertical. When the user's waist tilts backwards, the support member 1 rotates backwards, and the contact boss 14 and the limiting boss 23 separate, and the second elastic member is compressed.

[0046] The forward and backward sliding of the moving part 2 can also be controlled, with options for adaptive sliding and locking at different speeds.

[0047] like Figures 6-10 As shown, an operating component 8 is rotatably mounted on the base 3. Most of the operating component 8 protrudes from the base 3, and its outermost end is a knob for easy operation by the user. The operating component 8 is rotatably mounted on the base 3 around its axis. The base 3 also has a receiving groove 33, which communicates with the sliding groove 32. A front-to-back adjustment component is provided in the receiving groove 33. The operating component 8 is linked with the front-to-back adjustment component, which is configured to lock or unlock the movement of the moving component 2 in the sliding groove 32. Rotating the operating component 8 can lock or unlock the sliding of the moving component 2. When the moving component 2 is unlocked, the supporting component 1 can adapt to the front-to-back displacement. When the moving component 2 is locked, the supporting component 1 can maintain the adjusted seat depth position. Both functions are very necessary for the user.

[0048] The front-to-back adjustment assembly includes a locking member 10 and a locking part 24. The locking part 24 is disposed on the moving member 2 and includes a plurality of first teeth 241 arranged in the front-to-back direction. The locking member 10 is provided with second teeth 101. The first teeth 241 and the second teeth 101 are configured to lock the moving member 2 when they engage with each other. The front-to-back adjustment assembly also includes a transmission member 9, which is linked to the operating member 8. A transmission elastic member 17 is provided between the transmission member 9 and the locking member 10. When the transmission member 9 moves, it drives the locking member 10 to move toward or away from the locking part 24 through the transmission elastic member 17. The elastic element 17 allows the locking element 10 to have a delayed locking function. Even if the first tooth 241 and the second tooth 101 are not aligned, the operating element 8 can be rotated to switch states. The transmission elastic element 17 is compressed, giving the locking element 10 a spring force to move toward the locking part 24. After the moving element 2 is finely adjusted and the first tooth 241 and the second tooth 101 are aligned, they can directly engage to complete the locking. The number of first teeth 241 is at least two to increase the stability of the locking. Furthermore, the spacing of the first teeth 241 can be reduced to make the adjustable levels more numerous and delicate, improving the user experience.

[0049] Furthermore, the linkage between the operating component 8 and the transmission component 9 is as follows:

[0050] like Figures 7-9 As shown, the operating member 8 has an eccentric rotating part 81 at the end near the transmission member 9. Both the transmission member 9 and the locking member 10 are slidably disposed in the receiving groove 33. The operating member 8 is rotatably disposed on the base 3 about the axis. The transmission member 9 is provided with a transmission groove 91, and the eccentric rotating part 81 is provided with a transmission pin 84, which is inserted into the transmission groove 91. The eccentric rotating part 81 is eccentric to the axis of the operating member 8. The transmission groove 91 extends in a direction parallel to the moving member 2, that is, it extends horizontally. When the operating member 8 rotates, the eccentric rotating part 81 is displaced in the height direction, and the transmission pin 84 can move in the transmission groove 91 and drive the transmission member 9 to slide up and down.

[0051] The operating component 8 is provided with a shift protrusion 82, which protrudes radially from the operating component 8 and is located in the base 3. The base 3 has a mounting groove 34, and a gear shift component 18 is provided in the mounting groove 34. The gear shift component 18 has at least two shift grooves 182, and the shift protrusion 82 is located in one of the shift grooves 182. When the operating component 8 is rotated, the shift protrusion 82 shifts within the shift groove 182. The shift protrusion 82 and the shift groove 182 enable the operating component 8 to maintain its rotated position, providing operational stability and feedback, and preventing misoperation. The part is hollowed out and an elastic sheet 181 is formed near the operating member 8. The shift groove 182 is set on the elastic sheet 181. When the shift protrusion 82 shifts in the shift groove 182, the elastic sheet 181 will deform. The operating member 8 is also provided with two spare protrusions 83. The shift protrusion 82 and the spare protrusion 83 are evenly distributed along the circumference of the operating member 8. Therefore, the distance between the shift protrusion 82 and the spare protrusion 83 is 120°. The function of the spare protrusion 83 is that even if the shift protrusion 82 moves away from the gear position member 18 due to misoperation, the spare protrusion 83 can still play the role of the shift protrusion 82.

[0052] The locking member 10 and the transmission member 9 are both provided with a sunken groove 15, and the two sunken grooves 15 are oppositely arranged; the locking member 10 and the transmission member 9 are both provided with a connecting groove 16, the connecting groove 16 is communicated with the sunken groove 15, and the two ends of the transmission elastic member 17 are arranged in the two connecting grooves 16 and abut against the end surface of the sunken groove 15; when the locking member 10 is locked with the locking part 24, the transmission elastic member 17 is compressed and pressed down, and after the transmission elastic member 17 restores the elongation, the locking member 10 cannot be disengaged from the locking part 24, and the transmission elastic member 17 needs to be further lifted to pull up the locking member 10 upward; since the transmission elastic member 17 also plays a role of pulling up the locking member 10 upward to disengage the toothed engagement, the transmission elastic member 17 cannot only abut against the locking member 10 and the transmission member 9, and must be connected together; and through this setting mode, the transmission elastic member 17 can be more stably connected on the locking member 10 and the transmission member 9.

[0053] In addition, the base 3 is externally provided with a cover plate 19, and the cover plate 19 is configured to shield the accommodating groove 33 and the mounting groove 34; when the cover plate 19 is not provided, the accommodating groove 33 and the mounting groove 34 are exposed, which facilitates the mounting of the transmission member 9, the locking member 10 and the elastic sheet 181, and after the cover plate 19 is provided, the cover plate 19 can shield the transmission member 9, the locking member 10 and the elastic sheet 181, so that foreign matters cannot enter and affect the transmission.

Claims

1. An adjustment device, characterized by: The adjusting device comprises a base, a moving part and an operating part, the moving part is movably arranged in the base, and the operating part is rotatably arranged on the base; the base is provided with an adjusting part moving towards or away from the moving part, the adjusting part is configured to lock the moving part and the base when moving towards the moving part; the end of the operating part close to the adjusting part is provided with an eccentric rotating part, the eccentric rotating part is linked with the adjusting part, and the eccentric rotating part is configured to eccentrically rotate and drive the adjusting part to move towards or away from the moving part when the operating part rotates.

2. The adjustment device of claim 1, wherein: The adjusting part is provided with a transmission groove, and the eccentric rotating part is provided with a transmission pin inserted in the transmission groove; the transmission groove extends in a direction parallel to the moving part.

3. The adjustment device of claim 1, wherein: The adjusting part comprises a locking part and a transmission part, the locking part is arranged close to the moving part, the transmission part is linked with the adjusting part, and a transmission elastic part is arranged between the locking part and the transmission part, so that the locking part is driven to move towards or away from the moving part by the transmission elastic part when the transmission part moves.

4. The adjustment device of claim 3, wherein: The locking part and the transmission part are both provided with a sink groove, and the two sink grooves are oppositely arranged; the locking part and the transmission part are both provided with a connecting groove, the connecting groove is communicated with the sink groove, and the two ends of the transmission elastic part are arranged in the two connecting grooves and abut against the end faces of the sink grooves.

5. The adjustment device of claim 3, wherein: The moving part is provided with a locking part, the locking part comprises a plurality of first clamping teeth arranged in the front-back direction, the locking part is provided with a second clamping tooth, and the first clamping tooth and the second clamping tooth are configured to lock the moving part when clamped with each other; the number of the first clamping teeth is at least two.

6. The adjustment device of claim 1, wherein: The operating part is provided with a gear shifting protrusion, the gear shifting protrusion protrudes radially from the operating part, the base is provided with a gear part, the gear part comprises at least two gear shifting grooves, the gear shifting protrusion is located in one of the gear shifting grooves, and the gear shifting protrusion switches in the gear shifting groove when the operating part rotates.

7. The adjustment device of claim 6, wherein: The gear part is hollow in the middle and forms an elastic sheet close to the operating part, and the gear shifting groove is arranged on the elastic sheet.

8. The adjustment device of claim 6, wherein: The operating part is also provided with two standby protrusions, and the gear shifting protrusion and the standby protrusion are uniformly distributed in the circumferential direction of the operating part.

9. The adjustment device of claim 1, wherein: The base is provided with a sliding groove extending in the front-back direction and a containing groove extending in the up-down direction, the moving part is slidingly arranged in the sliding groove, and the adjusting part is slidingly arranged in the containing groove, and the containing groove is communicated with the sliding groove.

10. A lumbar support characterized by: The adjusting device comprises a supporting part and the adjusting device according to any one of claims 1-9, the supporting part is configured to support the waist of a human body, the supporting part is arranged on the moving part, the moving part is slidingly arranged on the base in the front-back direction, and the supporting part moves in the front-back direction with the sliding of the moving part.

Images