Waist rest capable of moving in multiple directions

Abstract

The utility model discloses a waist rest capable of moving in multiple directions. The waist rest comprises a bearing piece, a sliding piece, a main shell and a connecting base. The connecting base is used for being connected with a seat, the main shell is slidably arranged on the connecting base in the vertical direction, the sliding piece is slidably arranged on the main shell in the front-back direction, and the bearing piece is rotationally arranged on the sliding piece to bear the waist. A first sliding groove extending in the height direction is formed in the rear portion of the main shell and matched with the connecting base through a height adjusting assembly. A second sliding groove extending in the front-back direction is formed in the front portion, and a first elastic piece is arranged between the sliding piece and the main shell and provides forward elastic force. The waist rest integrates lifting, front-back sliding and rotating functions through the main shell, the bearing piece can move up and down along with the main shell, slide front and back along with the sliding piece and rotate around the sliding piece, and multi-direction movement is achieved; the whole structure is compact and simple, the assembly convenience of producers and the use comfort of consumers are both considered, the dynamic supporting requirements of the waist under different sitting postures are met, and the sedentariness experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of furniture, especially a multi-directional motion lumbar support. BACKGROUND

[0002] In the field of seat ergonomics, the lumbar support is a key component for supporting the human waist and relieving fatigue caused by long sitting, and its functional diversity and structural rationality have always been the focus of industry optimization. Traditional lumbar support products generally have problems such as single movement dimension and insufficient fit, and are difficult to meet the dynamic support needs of users in different sitting postures.

[0003] Most existing lumbar supports can only realize single-direction adjustment, such as fixed-height or fixed-angle support, and cannot adapt to the complex curve changes of the human waist when it is inclined forward or backward, twisted left or right, or displaced upward or downward. When the user changes posture after long sitting, such as from a forward-leaning posture for desk work to a backward-leaning posture for rest, the traditional lumbar support lacks multi-directional motion capability, which can easily cause support discontinuity, leading to ineffective relaxation of the waist muscles and possibly causing health problems such as waist and back pain after long-term use.

[0004] Some lumbar supports with multi-directional adjustment function often use a split structure or stack multiple independent drive components, resulting in bulky overall size and high cost. The complex mechanical structure not only increases the difficulty of production and assembly, but also may reduce the adjustment accuracy due to the fitting error between components, causing shaking or jamming, which affects user experience. SUMMARY

[0005] To solve the above technical problems, the utility model provides a multi-directional motion lumbar support, which includes a supporting member, a sliding member, a main housing, and a connecting seat. The connecting seat is used to connect a seat. The main housing is slidably arranged in the connecting seat along the vertical direction. The sliding member is slidably arranged in the main housing along the horizontal direction. The supporting member is rotatably arranged in the sliding member to support the waist. The rear part of the main housing is provided with a first sliding groove extending along the height direction, which cooperates with the connecting seat through a height adjustment assembly. The front part is provided with a second sliding groove extending along the front and back direction. A first elastic member is arranged between the sliding member and the main housing to provide forward elastic force. The lumbar support integrates lifting, front and back sliding, and rotating functions through the main housing. The supporting member can move up and down with the main housing, slide forward and backward with the sliding member, and rotate around the sliding member, realizing multi-directional motion. The first elastic member not only actively fits the waist, but also adapts to displacement with the forward and backward motion of the waist. The overall structure is compact and simple, taking into account the convenience of production and assembly and the comfort of use for consumers, meeting the dynamic support needs of the waist in different sitting postures, and improving the experience of long sitting.

[0006] The technical solution of the utility model is implemented as follows:

[0007] The application discloses a multi-directional waist support, which comprises a supporting part, a sliding part, a main shell and a connecting base, wherein the connecting base is configured to be connected with a seat, the main shell is arranged on the connecting base in a sliding mode along the up-down direction, the sliding part is arranged on the main shell in a sliding mode along the front-rear direction, and the supporting part is arranged on the sliding part in a rotating mode and configured to support the waist of a human body; a first sliding groove extending along the height direction is formed in the rear part of the main shell, the connecting base is arranged in the first sliding groove, and a height adjusting assembly is arranged between the main shell and the connecting base; a second sliding groove extending along the front-rear direction is formed in the front part of the main shell, the sliding part is arranged in the second sliding groove in a sliding mode, and a first elastic part giving the sliding part a forward elastic force is arranged between the sliding part and the main shell.

[0008] The supporting part is used for abutting and supporting the waist of a human body, and can realize the movement in the front-rear direction and the up-down direction under the action of the sliding part and the main shell; the supporting part is arranged on the sliding part in a rotating mode, and can realize the rotation in the front-rear direction, so as to realize the movement in multiple directions; the main shell is used as a main component, one side of the main shell is connected with the connecting base, and the other side of the main shell is arranged with the sliding part, so that the functions of lifting, front-rear sliding and rotation are concentrated, the structure is compact and simple, the producer can be facilitated, the use experience of the consumer can be improved, the adjustment is flexible, the movement performance problems caused by the complex mechanism can be avoided, the first elastic part gives the sliding part a forward elastic force, on one hand, the supporting part can be more abutted to the waist of the user, and on the other hand, the supporting part can be displaced adaptively along with the front-rear movement of the waist of the user.

[0009] As a preferred embodiment, the lower part of the supporting part is connected with the front part of the sliding part in a rotating mode, and a second elastic part giving the supporting part a forward elastic force is arranged between the supporting part and the sliding part. The forward elastic force given by the second elastic part to the supporting part enables the supporting part to rotate back to the original position, and enables the supporting part to be better abutted to the waist of a human body after the supporting part is rotated backward, so as to adapt to the inclination of the waist of a human body.

[0010] As a preferred embodiment, the rotating connection point of the supporting part and the sliding part is located below the second elastic part, the front part of the sliding part is provided with a limiting boss in a protruding mode downward, and the supporting part is abutted to the limiting boss under the action of the second elastic part. The supporting part is also provided with an abutting boss, the abutting boss is abutted to the limiting boss to limit the rotation of the supporting part, at this time, the supporting part is in the original state, and the waist of the user is kept vertical basically; when the waist of the user is inclined backward, the supporting part is rotated backward, the abutting boss and the limiting boss are separated, and the second elastic part is compressed.

[0011] As preferred, the lower part of the supporting member is provided with a rotating groove which is open to the rear, the front end of the sliding member is arranged in the rotating groove, the rotating connection point between the supporting member and the sliding member is below the rotating groove, and there is a gap between the front end face of the rotating groove and the front end face of the sliding member. The rotating groove makes the rotation of the supporting member and the sliding member more closely, and improves the stability; the rotating point of the supporting member is below, which can make the overall rotation of the supporting member to the rear more obvious, and the user's feeling is more obvious, and the comfortable self-adaptive close to the waist is truly provided.

[0012] As preferred, the front end face of the sliding member is provided with a recess which is recessed to the rear, the second elastic member is arranged in the recess and the rotating groove, and the two ends of the second elastic member respectively abut against the end face of the recess and the end face of the rotating groove. The rotating groove and the recess are also used for arranging the second elastic member, which hides and protects the second elastic member, and achieves two purposes at once.

[0013] As preferred, the operating lever is rotatably arranged on the main shell, and the main shell is also provided with a containing groove which is communicated with the second sliding groove, and the front and rear adjusting assembly is arranged in the containing groove, the operating lever is linked with the front and rear adjusting assembly, and the front and rear adjusting assembly is configured to lock or unlock the movement of the sliding member in the second sliding groove. Rotating the operating lever can realize the locking or unlocking of the sliding of the sliding member, when the sliding member is unlocked, the supporting member can be self-adaptively displaced forward and backward, and when the sliding member is locked, the supporting member can be kept at the adjusted seat depth position, and both functions are necessary for the user.

[0014] As preferred, the front and rear adjusting assembly comprises a locking member and a locking portion, the locking portion is arranged on the sliding member, the locking portion comprises a plurality of first clamping teeth arranged in the front and rear directions, the locking member is provided with a second clamping tooth, the first clamping tooth and the second clamping tooth are configured to lock the sliding member when they are clamped with each other; the front and rear adjusting assembly further comprises a transmission member, the transmission member is linked with the operating lever, and a third elastic member is arranged between the transmission member and the locking member, and the transmission member moves to drive the locking member to move towards or away from the locking portion through the third elastic member. The third elastic member can make the locking member have a delayed locking function, that is, even if the first clamping tooth and the second clamping tooth are not aligned, the state switching of the operating lever can be operated first, the third elastic member is compressed to give the locking member a spring force to move towards the locking portion, and after the sliding member is finely adjusted and the first clamping tooth and the second clamping tooth are aligned, they can be directly engaged to complete the locking.

[0015] As preferred, the operating lever has a cam portion at the end close to the transmission member, the transmission member and the locking member are slidably arranged in the containing groove in the up and down directions, and the operating lever is rotatably arranged on the main shell about an axis; the transmission member is provided with a transmission groove, and the cam portion is provided with a transmission pin which is inserted into the transmission groove. The cam portion is eccentric to the axis of the operating lever, when the operating lever rotates, the cam portion generates displacement in the height direction, and the transmission pin can move in the transmission groove to drive the transmission member to slide up and down.

[0016] As preferred, the operating rod is provided with a shifting protrusion, the shifting protrusion protrudes radially from the operating rod, the shifting protrusion is located in the main shell, the main shell is provided with a mounting groove, the mounting groove is provided with an elastic piece, the elastic piece is provided with at least two shifting grooves, and the shifting protrusion is located in one of the shifting grooves. The shifting protrusion and the shifting groove can keep the operating rod in a post-rotation posture, provide operation stability and feedback feeling, and prevent misoperation; when the shifting protrusion is switched in the shifting groove, the elastic piece will be self-deformed.

[0017] As preferred, the main shell is provided with a cover plate, and the cover plate is configured to shield the accommodating groove and the mounting groove. When the cover plate is not provided, the accommodating groove and the mounting groove are exposed, facilitating the mounting of the transmission member, the locking member and the elastic piece, and the cover plate can shield the accommodating groove and the mounting groove after being provided, preventing foreign matters from entering and affecting the transmission.

[0018] The design starting point, concept and beneficial effects of the utility model with the above technical scheme are as follows:

[0019] The supporting member is used for adhering and supporting the waist of a human body, and can move in the front-back and up-down directions under the actions of the sliding member and the main shell. The supporting member is rotationally arranged on the sliding member, and can rotate in the front-back direction, thereby realizing movement in multiple directions. The main shell is a main component, and is connected to the connecting seat on one side and provided with the sliding member on the other side, thereby concentrating the lifting, front-back sliding and rotating functions, and being compact and simple in structure, which can facilitate the producer and improve the use experience of the consumer. The first elastic member gives the sliding member a forward elastic force, which can make the supporting member adhere to the waist of the user more closely, and also facilitate the self-adaptive displacement of the supporting member following the front-back movement of the waist of the user. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The utility model discloses a three-dimensional structure diagram of the waist support in the embodiment Figure 1 ;

[0021] Figure 2 The utility model discloses a three-dimensional structure diagram of the waist support in the embodiment Figure 2 ;

[0022] Figure 3 The utility model discloses a sectional view of the waist support in the embodiment

[0023] Figure 4 The utility model discloses a three-dimensional structure diagram of the supporting member in the embodiment

[0024] Figure 5 The utility model discloses a three-dimensional structure diagram of the sliding member in the embodiment

[0025] Figure 6 The utility model discloses a three-dimensional structure diagram of the main shell in the embodiment

[0026] Figure 7 The utility model discloses the three -dimensional structure schematic diagram of setting gear, locking piece, transmission part and operating lever on the main casing in the embodiment of the utility model;

[0027] Figure 8 The utility model discloses the three -dimensional structure schematic diagram of gear, locking piece, transmission part and operating lever interconnection in the embodiment of the utility model;

[0028] Figure 9 The utility model discloses the three -dimensional structure schematic diagram of transmission part, third elastic part, locking piece in the embodiment of the utility model Figure 1 .

[0029] Figure 10 The utility model discloses the three -dimensional structure schematic diagram of transmission part, third elastic part, locking piece in the embodiment of the utility model Figure 2 .

[0030] The reference numerals are: support piece 1;Mounting rod 11;Mounting seat 12;Rotary groove 121;Rotary seat 13;Butt joint boss 14;Sliding piece 2;Insert part 21;Groove 211;Rotary part 22;Limit boss 23;Locking part 24;First pawl 241;Main casing 3;First sliding groove 31;Second sliding groove 32;Accommodation groove 33;Mounting groove 34;Connection seat 4;First elastic part 5;Barrier strip 6;Operating lever 8;Cam part 81;Gear shifting boss 82;Standby boss 83;Transmission pin 84;Transmission part 9;Transmission groove 91;Locking piece 10;Second pawl 101;Sunk groove 15;Connection groove 16;Third elastic part 17;Gear 18;Elastic sheet 181;Gear shifting groove 182;Cover plate 19. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model is further described in detail below combining with the drawings and specific embodiments. It should be explained that the embodiments of the application and the features in the embodiments can be combined mutually in the case where there is no conflict.

[0032] In the following description, a lot of specific details are set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from the description, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0033] 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.

[0034] The specific embodiment of the utility model is as follows:

[0035] As Figures 1-3The utility model provides a multi -directional motion's waist rests, including support piece 1, sliding piece 2, main casing 3 and connecting seat 4, connecting seat 4 is configured as connecting seat, main casing 3 is along up and down direction and is slidably arranged on connecting seat 4, sliding piece 2 is along front and back direction and is slidably arranged on main casing 3, support piece 1 is rotatably arranged on sliding piece 2, support piece 1 is configured as the support human waist, main casing 3 rear part is set with along the height direction and extends first sliding slot 31, connecting seat 4 is set in first sliding slot 31, and height adjusting assembly is equipped between main casing 3 and connecting seat 4, main casing 3 front part is set with along the front and back direction and extends second sliding slot 32, and sliding piece 2 is slidably arranged in second sliding slot 32, and first elastic piece 5 is equipped between sliding piece 2 and main casing 3 and gives sliding piece 2 forward elastic force.

[0036] Support piece 1 is used for adhering and supporting human waist, it can realize the movement in front and back, up and down direction under the action of sliding piece 2, main casing 3, support piece 1 is rotatably arranged on sliding piece 2, can realize the rotation in front and back, to realize the movement in multiple directions, main casing 3 is as the main component, one side connects connecting seat 4, the other side sets up sliding piece 2, to concentrate the lifting, front and back sliding and rotation function, compact and simple structure, can facilitate producer, can also improve the use feeling of consumer, and the adjustment is flexible, avoids the movement performance problem of complex mechanism, first elastic piece 5 gives sliding piece 2 forward elastic force, on the one hand can let support piece 1 more adhere to the waist of user, on the other hand also facilitates support piece 1 to follow the front and back movement of the waist of user and self-adapting displacement.

[0037] Specifically, sliding piece 2, main casing 3 and connecting seat 4 are all block-shaped parts, the combination of the three has a small overall volume, the size of support piece 1 is much larger than that of the three, and the compact and small layout of the structure can be applied to various seats; The height adjusting assembly between main casing 3 and connecting seat 4 is of a conventional structure and will not be described herein; A blocking strip 6 is also provided in the first sliding slot 31, the blocking strip 6 is inverted U-shaped, the blocking strip 6 limits the connecting seat 4 in the first sliding slot 31, and the blocking strip 6 is fixedly connected with the main casing 3. The rotary connection of the support piece 1 is as follows:

[0038] For example, Figures 3-5As shown, the supporting member 1 is in a frame structure, which includes a mounting rod 11 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 below the mounting seat 12, the mounting seat 12 protrudes upwardly from the mounting rod 11, the rotating seat 13 protrudes rearwardly from the mounting rod 11, and the rotating seat 13 is rotationally connected to the front part of the sliding member 2; the front part of the sliding member 2 includes an insertion part 21 and a rotating part 22, the rotating seat 13 is specifically connected to the rotating part 22, and the rotating part 22 has a curved surface to adapt to rotation; the mounting seat 12 is provided with a rotating groove 121 which is open rearwardly, the insertion part 21 is inserted into the rotating groove 121, and the front end surface of the insertion part 21 is provided with a recess 211 which is recessed rearwardly; a second elastic member (not shown) which gives the supporting member 1 a forward elastic force is arranged between the supporting member 1 and the sliding member 2, the second elastic member is specifically arranged in the recess 211 and the rotating groove 121, and the two ends of the second elastic member respectively abut against the end surfaces of the recess 211 and the rotating groove 121; the forward elastic force given by the second elastic member to the supporting member 1 enables the supporting member 1 to rotate and reset, and also enables the supporting member 1 to better fit the human waist after being rotated rearwardly, and to adapt to the inclination of the human waist; the arrangement of the rotating groove 121 and the recess 211 for the second elastic member hides and protects the second elastic member, and achieves two purposes at once; in addition, there is a gap between the front end surface of the rotating groove 121 and the front end surface of the sliding member 2 to avoid the rearward rotation of the supporting member 1; the arrangement of the rotating groove 121 enables the rotation of the supporting member 1 and the sliding member 2 to be more closely connected, and improves the stability; the rotation point of the supporting member 1 is below, which enables the overall rearward rotation of the supporting member 1 to be more obvious, and the user's experience is also more obvious, and the supporting member 1 truly provides comfortable adaptive fitting to the waist.

[0039] The rotation connecting point of the supporting member 1 and the sliding member 2 is below the second elastic member and also below the rotating groove 121, the rotating part 22 is provided with a limiting boss 23 which protrudes downwardly, under the action of the second elastic member, the supporting member 1 abuts against the limiting boss 23; the rotating seat 13 of the supporting member 1 has two, the two rotating seats 13 sandwich the rotating part 22, and a abutting boss 14 which protrudes rearwardly is arranged between the two rotating seats 13, the abutting boss 14 abuts against the limiting boss 23 to limit the rotation of the supporting member 1, at this time, the supporting member 1 is in an initial state, and the waist of the user is roughly kept vertical; when the waist of the user is inclined rearwardly, the supporting member 1 is rotated rearwardly, the abutting boss 14 and the limiting boss 23 will be separated, and the second elastic member will be compressed.

[0040] The forward and rearward sliding of the sliding member 2 can also be controlled, and can be selected to adaptively slide or to be locked in a gear position:

[0041] For example, Figures 6-10As shown, the operating lever 8 is rotatably arranged on the main housing 3, and most of the operating lever 8 protrudes from the main housing 3, and the outermost end of the operating lever 8 is a knob to facilitate the user to operate, and the operating lever 8 is rotatably arranged on the main housing 3 about its axis; the main housing 3 is also provided with a receiving groove 33, the receiving groove 33 is through with the second sliding groove 32, and the receiving groove 33 is provided with a front and rear adjusting assembly, the operating lever 8 is linked with the front and rear adjusting assembly, and the front and rear adjusting assembly is configured to lock or unlock the movement of the sliding piece 2 in the second sliding groove 32; rotating the operating lever 8 can realize the locking or unlocking of the sliding of the sliding piece 2, when the sliding piece 2 is unlocked, the supporting piece 1 can be self-adapted to the front and rear displacement, and when the sliding piece 2 is locked, the supporting piece 1 can be kept at the adjusted seat depth position, and both functions are necessary for the user.

[0042] The front and rear adjusting assembly includes a locking piece 10 and a locking portion 24, the locking portion 24 is arranged on the sliding piece 2, the locking portion 24 includes a plurality of first clamping teeth 241 arranged in the front and rear direction, and the locking piece 10 is provided with second clamping teeth 101, the first clamping teeth 241 and the second clamping teeth 101 are configured to lock the sliding piece 2 when they are clamped with each other; the front and rear adjusting assembly further includes a transmission piece 9, the transmission piece 9 is linked with the operating lever 8, and the transmission piece 9 and the locking piece 10 are provided with a third elastic piece 17, when the transmission piece 9 moves, the third elastic piece 17 drives the locking piece 10 to move towards or away from the locking portion 24; the third elastic piece 17 can make the locking piece 10 have a delayed locking function, that is, even if the first clamping teeth 241 and the second clamping teeth 101 are not aligned, the operating lever 8 can be rotated to switch the state, the third elastic piece 17 is compressed to give the locking piece 10 a spring force to move towards the locking portion 24, after the sliding piece 2 is finely adjusted and the first clamping teeth 241 and the second clamping teeth 101 are aligned, they can be directly engaged to complete the locking; the number of the first clamping teeth 241 is at least two to increase the stability of the locking, and further, the spacing of the first clamping teeth 241 can be reduced to make the adjustable gear more and delicate, and improve the user's experience.

[0043] Further, the linkage between the operating lever 8 and the transmission piece 9 is as follows:

[0044] As shown in the drawings, Figures 7-9 The operating lever 8 has a cam portion 81 at the end close to the transmission piece 9, the transmission piece 9 and the locking piece 10 are both arranged in the receiving groove 33 to slide up and down, and the operating lever 8 is rotatably arranged on the main housing 3 about its axis; the transmission piece 9 is provided with a transmission groove 91, and the cam portion 81 is provided with a transmission pin 84, the transmission pin 84 is inserted into the transmission groove 91; the cam portion 81 is eccentric to the axis of the operating lever 8, the transmission groove 91 extends in the direction parallel to the sliding piece 2, that is, horizontally, when the operating lever 8 rotates, the cam portion 81 produces displacement in the height direction, and the transmission pin 84 can move in the transmission groove 91 to drive the transmission piece 9 to slide up and down.

[0045] The operating lever 8 is provided with a gear shifting protrusion 82 which protrudes radially from the operating lever 8 and is located in the main housing 3 which is provided with a mounting groove 34, and the mounting groove 34 is provided with a gear position member 18 which is provided with at least two gear shifting grooves 182, and the gear shifting protrusion 82 is located in one of the gear shifting grooves 182 and is switched in the gear shifting groove 182 when the operating lever 8 rotates; the gear shifting protrusion 82 and the gear shifting groove 182 can keep the operating lever 8 in the posture after rotation, provide operation stability and feedback feeling, and prevent misoperation; the gear position member 18 is hollow in the middle and is provided with an elastic sheet 181 near the operating lever 8, and the gear shifting groove 182 is arranged on the elastic sheet 181; the elastic sheet 181 will deform when the gear shifting protrusion 82 is switched in the gear shifting groove 182; the operating lever 8 is also provided with two standby protrusions 83, and the gear shifting protrusion 82 and the standby protrusion 83 are uniformly distributed along the circumference of the operating lever 8; therefore, the distance between the gear shifting protrusion 82 and the standby protrusion 83 is 120°; the standby protrusion 83 can play the role of the gear shifting protrusion 82 even if the gear shifting protrusion 82 is away from the gear position member 18 due to misoperation.

[0046] The locking member 10 and the transmission member 9 are both provided with a sunken groove 15 which is arranged oppositely to the other; the locking member 10 and the transmission member 9 are both provided with a connecting groove 16 which is communicated with the sunken groove 15, and the two ends of the third elastic member 17 are arranged in the two connecting grooves 16 and abut against the end faces of the sunken grooves 15; when the locking member 10 is locked with the locking part 24, the third elastic member 17 is compressed downward, and after the third elastic member 17 restores the elongation, the locking member 10 cannot be disengaged from the locking part 24, and the third elastic member 17 needs to be further lifted to pull up the locking member 10 upward; since the third elastic member 17 also plays the role of pulling up the locking member 10 upward to disengage the toothed engagement, the third elastic member 17 cannot only abut against the locking member 10 and the transmission member 9, but must be connected together; and through this arrangement, the third elastic member 17 can be more stably connected to the locking member 10 and the transmission member 9.

[0047] In addition, the main housing 3 is provided with a cover plate 19 which is configured to shield the containing groove 33 and the mounting groove 34; when there is no cover plate 19, the containing groove 33 and the mounting groove 34 are exposed, which facilitates the installation of the transmission member 9, the locking member 10 and the elastic sheet 181, and after the cover plate 19 is arranged, it can be shielded to prevent foreign matters from entering and affecting the transmission.

Claims

1. A multi-directional lumbar support, characterized by: The application relates to a supporting device for a seat, which comprises a supporting part, a sliding part, a main shell and a connecting base. The connecting base is configured to connect a seat. The main shell is arranged on the connecting base in a sliding mode along the vertical direction. The sliding part is arranged on the main shell in a sliding mode along the front-rear direction. The supporting part is arranged on the sliding part in a rotating mode. The supporting part is configured to support the waist of a human body. A first sliding groove extending along the vertical direction is arranged in the rear part of the main shell. The connecting base is arranged in the first sliding groove. A height adjusting assembly is arranged between the main shell and the connecting base. A second sliding groove extending along the front-rear direction is arranged in the front part of the main shell. The sliding part is arranged in the second sliding groove. A first elastic part giving the sliding part a forward elastic force is arranged between the sliding part and the main shell.

2. The multi-directional lumbar support of claim 1, wherein: The lower part of the supporting part is connected to the front part of the sliding part in a rotating mode. A second elastic part giving the supporting part a forward elastic force is arranged between the supporting part and the sliding part.

3. The multi-directional lumbar support of claim 2, wherein: The rotating connection point of the supporting part and the sliding part is below the second elastic part. A limiting boss is protruded downward from the front part of the sliding part. The supporting part is in abutment with the limiting boss under the action of the second elastic part.

4. The multi-directional lumbar support of claim 2, wherein: The lower part of the supporting part is arranged with a rotating groove which is open backward. The front end of the sliding part is arranged in the rotating groove. The rotating connection point of the supporting part and the sliding part is below the rotating groove. There is a gap between the front end surface of the rotating groove and the front end surface of the sliding part.

5. The multi-directional lumbar support of claim 4, wherein: The front end surface of the sliding part is arranged with a recess which is recessed backward. The second elastic part is arranged in the recess and the rotating groove. The two ends of the second elastic part are in abutment with the end surface of the recess and the end surface of the rotating groove respectively.

6. The multi-directional lumbar support of claim 1, wherein: An operating rod is arranged on the main shell in a rotating mode. The main shell is arranged with a containing groove. The containing groove is communicated with the second sliding groove. A front-rear adjusting assembly is arranged in the containing groove. The operating rod is linked with the front-rear adjusting assembly. The front-rear adjusting assembly is configured to lock or unlock the movement of the sliding part in the second sliding groove.

7. The multi-directional lumbar support of claim 6, wherein: The front-rear adjusting assembly comprises a locking part and a locking portion. The locking portion is arranged on the sliding part. The locking portion comprises a plurality of first clamping teeth arranged along the front-rear direction. The locking part is arranged with second clamping teeth. The first clamping teeth and the second clamping teeth are configured to lock the sliding part when they are clamped with each other. The front-rear adjusting assembly further comprises a transmission part. The transmission part is linked with the operating rod. A third elastic part is arranged between the transmission part and the locking part. When the transmission part moves, the third elastic part drives the locking part to move towards or away from the locking portion.

8. The multi-directional lumbar support of claim 7, wherein: The end of the operating rod close to the transmission part is provided with a cam part. The transmission part and the locking part are arranged in the containing groove in a sliding mode. The operating rod is arranged on the main shell in a rotating mode around an axis. The transmission part is arranged with a transmission groove. The cam part is arranged with a transmission pin. The transmission pin is inserted in the transmission groove.

9. The multi-directional lumbar support of claim 6, wherein: The operating rod is arranged with a gear shift protrusion. The gear shift protrusion protrudes radially from the operating rod. The gear shift protrusion is arranged in the main shell. The main shell is arranged with a mounting groove. The mounting groove is arranged with an elastic sheet. The elastic sheet is arranged with at least two gear shift grooves. The gear shift protrusion is arranged in one of the gear shift grooves.

10. The multi-directional lumbar support of claim 9, wherein: The main shell is arranged with a cover plate. The cover plate is configured to shield the containing groove and the mounting groove.

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