Waist supporting device and seat

Abstract

The utility model discloses a waist supporting device and a seat, the waist supporting device comprises a back support, a waist rest and a telescopic assembly, and the waist rest is connected with the back support through the telescopic assembly; the adjusting assembly comprises a telescopic sleeve, a telescopic piece, a locking piece and an elastic piece, the telescopic sleeve, the telescopic piece, the locking piece and the elastic piece of the telescopic assembly are matched, the position of the waist rest can be adjusted forwards or backwards, so that the waist rest can well support the waist of a user, and the use requirements of customers are met.

Description

Technical Field

[0001] The utility model relates to the technical field of seat manufacturing, in particular to a waist supporting device and a seat. Background Art

[0002] The structure of the seat includes a seat cushion, a backrest, armrests and a lumbar support. The lumbar support can provide support for the human waist and can greatly improve comfort. However, in the related art, the lumbar support of some seats is fixed on the back support and cannot be adjusted according to the user's needs, which affects the user's experience. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a lumbar support device, which can adjust the position of the lumbar support forward or backward through a telescopic component so that the lumbar support can better support the user's waist and meet the user's usage needs.

[0004] In a second aspect, the utility model also proposes a seat using the above-mentioned lumbar support device.

[0005] According to the first aspect of the present invention, a waist support device is provided, comprising:

[0006] Back support;

[0007] A lumbar support connected to the back support via a telescopic assembly;

[0008] The telescopic assembly comprises a telescopic sleeve, a telescopic member, a locking member and an elastic member, one end of the telescopic sleeve is connected to the back bracket, a telescopic channel extending in the front-to-back direction is arranged inside the telescopic sleeve, a yielding portion, a clamping portion and a plurality of gear slots are arranged on the bottom wall of the telescopic channel, the yielding portion is located at the front side of the telescopic channel, the clamping portion is located at the rear side of the telescopic channel, a plurality of gear slots are arranged between the yielding portion and the clamping portion at intervals in the front-to-back direction, a blocking surface is arranged on the rear side of the gear slot, and a guiding surface inclined upward is provided on the front side, and the upper end of the guiding surface is flush with the bottom wall of the telescopic channel;

[0009] The telescopic member is arranged in the telescopic passage and can slide forward and backward, the locking member has a latch and a connecting column, the telescopic member is provided with a latching groove and a clearance groove which are interconnected, the locking member is movably connected to the telescopic member, the elastic member is arranged between the telescopic member and the locking member, when the connecting column is located in the latching groove, the elastic member can push the locking member to make the latch engage in the gear groove; when the connecting column is located in the clearance groove, the latch is separated from the gear groove;

[0010] Wherein, the lumbar support is connected to the front end of the telescopic member, and when the connecting post is located in the engaging groove, the latch tooth is engaged with the gear slot, and the rear side abuts against the blocking surface; when the telescopic member moves forward, the latch tooth slides through a plurality of the gear slots and abuts against the giving way portion, and the giving way portion can push the latch tooth to drive the connecting post to engage in the giving way slot, so that the latch tooth and the gear slot remain separated; when the telescopic member moves backward, the latch tooth moves backward along the telescopic channel and abuts against the engaging portion, and the engaging portion can push the latch tooth to drive the connecting post to engage in the engaging slot, and the elastic member can push the locking member to enable the latch tooth to engage in the gear slot.

[0011] The lumbar support device provided by the embodiment of the first aspect of the utility model has at least the following beneficial effects: the lumbar support device is applied to a seat, and when in use, the latching teeth of the locking member are locked in the gear slot and abut against the blocking surface at the rear side of the gear slot, and the blocking surface can provide a supporting force for the locking member, and the supporting force is transmitted to the lumbar support through the telescopic member to support the user's waist; when the user needs to adjust the position of the lumbar support forward, the user grasps and pulls the lumbar support forward, and the lumbar support can drive the telescopic member and the locking member to move forward, and the latching teeth of the locking member can move along the guide surface The lumbar support is a kind of backrest that is used for supporting the user's waist and backrest. The backrest ...

[0012] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the telescopic sleeve includes an upper shell and a lower shell, the upper shell is connected to the lower shell to define the square telescopic channel, and the shape of the telescopic member matches the shape of the telescopic channel.

[0013] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the upper shell is provided with a plurality of upper connecting parts, the plurality of upper connecting parts are placed on two opposite sides of the upper shell, and a plurality of lower connecting parts are provided, the plurality of upper connecting parts correspond to the plurality of lower connecting parts one by one and are connected by fasteners.

[0014] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the inner wall of the telescopic sleeve is provided with a guide groove extending in the front-to-back direction, and the outer wall of the telescopic member is provided with a guide block, which is inserted into the guide groove and can slide in the guide groove.

[0015] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the back support is provided with a sliding column, a receiving cavity is provided in the middle of the sliding column, the telescopic component is provided in the receiving cavity, a sliding sleeve is provided on the rear side of the lumbar support, the sliding sleeve is provided on the outer periphery of the sliding column and can slide back and forth, and the telescopic member is connected to the sliding sleeve by a fastener.

[0016] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, a rotating shaft is arranged on the front side of the sliding sleeve, and the lower end of the lumbar support is connected to the rotating shaft and can be pitched and rotated.

[0017] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, an elastic support member is arranged between the lumbar support and the sliding sleeve, the elastic support member is located on the upper side of the rotating shaft, one end of the elastic support member abuts the sliding sleeve, and the other end abuts the lumbar support.

[0018] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, a guide column is arranged in the accommodating cavity, a guide sleeve is arranged inside the sliding sleeve, and the guide column is inserted into the guide sleeve.

[0019] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, a plurality of guide columns are arranged in the accommodating cavity, and the plurality of guide columns are arranged at intervals along the circumference of the accommodating cavity. A plurality of guide sleeves are arranged inside the sliding sleeve, and the plurality of guide columns correspond to each other one by one and are plugged into the plurality of guide sleeves.

[0020] The seat provided according to the second embodiment of the utility model comprises the lumbar support device as described in the first embodiment of the utility model, and has all the beneficial effects of the lumbar support device.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 An overall schematic diagram of a lumbar support device provided by an embodiment of the first aspect of the utility model;

[0024] Figure 2 A cross-sectional view of a lumbar support device provided by an embodiment of the first aspect of the utility model;

[0025] Figure 3 An exploded schematic diagram of a lumbar support device provided by an embodiment of the first aspect of the utility model;

[0026] Figure 4 This is a schematic diagram of another angle of the lumbar support device of the first embodiment of the utility model.

[0027] Figure 5 An exploded schematic diagram of a telescopic assembly provided in an embodiment of the first aspect of the utility model;

[0028] Figure 6 A schematic diagram of the structure of the lower housing provided by an embodiment of the first aspect of the utility model;

[0029] Figure 7 A schematic structural diagram of a telescopic member provided in an embodiment of the first aspect of the utility model.

[0030] The figures are as follows:

[0031] Back support 100; sliding column 110; guide column 120;

[0032] Lumbar support 200; sliding sleeve 210; guide sleeve 220; rotating shaft 230; elastic support member 240;

[0033] Telescopic assembly 300; telescopic sleeve 310; telescopic channel 311; gear slot 312; yielding portion 313; clamping portion 314; upper shell 315; lower shell 316; guide slot 317; telescopic member 320; clamping slot 321; yielding slot 322; main shell 323; cover plate 324; guide block 325; locking member 330; latch tooth 331; connecting column 332; elastic member 340. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.

[0036] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] The structure of the seat includes a seat cushion, a backrest, armrests and a lumbar support. The lumbar support can provide support for the human waist and can greatly improve comfort. However, in the related art, the lumbar support of some seats is fixed on the back support and cannot be adjusted according to the user's needs, which affects the user's experience.

[0039] To solve this problem, a first embodiment of the present invention provides a lumbar support device for use in a seat. The specific structure and function of the lumbar support device provided by the embodiment of the present invention will be further described below in conjunction with text and drawings.

[0040] Reference Figures 1 to 4 According to the first aspect of the utility model, the backrest device provided by the embodiment includes: a back support 100, a lumbar support 200 and a telescopic component 300. The lumbar support 200 is connected to the back support 100 through the telescopic component 300. The position of the lumbar support 200 can be adjusted forward and backward through the telescopic component 300, so that the lumbar support 200 can better support the user's waist and meet the customer's usage needs.

[0041] Reference Figures 2 to 7According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the telescopic assembly 300 includes a telescopic sleeve 310, a telescopic member 320, a locking member 330 and an elastic member 340. One end of the telescopic sleeve 310 is connected to the front side of the back support 100 through a fastener. The interior of the telescopic sleeve 310 is provided with a telescopic channel 311 extending in the front-to-back direction. The bottom wall of the telescopic channel 311 is provided with a yielding portion 313, a clamping portion 314 and a plurality of gear slots 312. The yielding portion 313 is located at the front side of the telescopic channel 311, and the clamping portion 314 is located at the front side of the telescopic channel 311. 1, a plurality of gear slots 312 are arranged at intervals along the front-to-back direction between the yielding portion 313 and the clamping portion 314, the gear slots 312 are provided with a blocking surface at the rear side, and a guide surface inclined upward at the front side, and the upper end of the guide surface is flush with the bottom wall of the telescopic channel 311; the telescopic member 320 is arranged in the telescopic channel 311 and can slide back and forth, the locking member 330 has a latching tooth 331 and a connecting column 332, the telescopic member 320 is provided with a clamping slot 321 and a yielding slot 322 that are interconnected, the locking member 330 is movably connected to the telescopic member 320, and the elastic member 340 is provided at When the connecting post 332 is located in the engaging groove 321, the elastic member 340 can push the locking member 330 to make the latch 331 engage in the gear slot 312; when the connecting post 332 is located in the yielding groove 322, the latch 331 is separated from the gear slot 312; wherein, the lumbar support 200 is connected to the front end of the telescopic member 320 and can drive the telescopic member 320 to move forward and backward; when the connecting post 332 is located in the engaging groove 321, the latch 331 engages in the gear slot 312 on the lower side of the telescopic sleeve 310, and the rear side abuts against the blocking surface; when the telescopic member 320 moves to When the telescopic member 320 moves forward, the latch tooth 331 slides through multiple gear slots 312 in sequence and then abuts against the yielding portion 313. The yielding portion 313 can push the latch tooth 331 to drive the connecting column 332 to snap into the yielding slot 322, so that the latch tooth 331 remains separated from the gear slot 312; when the telescopic member 320 moves backward, the latch tooth 331 moves backward along the telescopic channel 311 and abuts against the engaging portion 314. The engaging portion 314 can push the latch tooth 331 to drive the connecting column 332 to snap into the engaging slot 321, and the elastic member 340 can push the locking member 330 to make the latch tooth 331 snap into the gear slot 312.

[0042] According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the lumbar support device is applied to a seat. When in use, the latching tooth 331 of the locking member 330 is latched in the gear slot 312 and abuts against the blocking surface at the rear side of the gear slot 312. The blocking surface can provide a supporting force for the locking member 330, and the supporting force is transmitted to the lumbar support 200 through the telescopic member 320 to support the user's waist. When the user needs to adjust the position of the lumbar support 200 forward, the user grasps and pulls the lumbar support 200 forward, and the lumbar support 200 can drive the telescopic member 320 and the locking member 330 to move forward. The latching tooth 331 of the locking member 330 can slide forward along the guide surface to latch into the gear slot 312 on the front side. When the user needs to adjust the position of the lumbar support 200 backward, he should first grasp and pull the lumbar support 200 forward. The lumbar support 200 can drive the telescopic member 320 and the locking member 330 to move forward. When the latch tooth 331 slides through the gear slot 312 at the front end, the latch tooth 331 can slide into the telescopic channel 311 along the guide surface and abut against the yielding portion 313. At this time, the latch tooth 331 is separated from the gear slot 312. When the lumbar support 200 is pulled forward again, the yielding portion 313 can push the latch tooth 331 to drive the locking member 330 to move, so that the connecting column 332 is stuck in the yielding slot 322, so that the latch tooth 331 remains separated from the gear slot 312. At this time, the user can push the lumbar support 200 to slide backward. When the lumbar support 200 slides backward, the telescopic member 320 moves backward, and the latch tooth 331 slides along the telescopic channel 311 and abuts against the return portion. The return portion can push the latch tooth 331 to drive the locking member 330 to move, so that the connecting column 332 is inserted into the latch groove 321. The elastic member 340 can push the locking member 330 to make the latch tooth 331 insert into the gear groove 312. The latch tooth 331 of the locking member 330 is inserted into the gear groove 312 at the rear side of the telescopic channel 311 and abuts against the rear blocking surface of the gear groove 312, thereby supporting the user's waist.

[0043] Reference Figures 5 to 7 It can be understood that the telescopic member 320 includes a main shell 323 and a cover plate 324, the main shell 323 and the cover plate 324 are detachably connected, the main shell 323 is provided with a mounting groove for mounting the locking member 330, and the cover plate 324 is connected to the main shell 323 to confine the locking member 330 in the mounting groove; the elastic member 340 is arranged between the locking member 330 and the main shell 323, the upper end of the elastic member 340 abuts the main shell 323, and the lower end abuts the upper side of the locking member 330, the elastic member 340 can provide a downward elastic force for the locking member 330, so that the latch tooth 331 at the lower end of the locking member 330 protrudes from the lower side of the telescopic member 320.

[0044] Reference Figure 7It can be understood that the main shell 323 and the cover plate 324 are both provided with a snap-in groove 321 and a clearance groove 322, wherein the snap-in groove 321 is arranged in a top-down direction, and the clearance groove 322 is arranged in a horizontal direction and is connected to the upper end of the snap-in groove 321; the locking piece 330 is located between the main shell 323 and the cover plate 324, and connecting columns 332 are provided on both sides of the locking piece 330, and the connecting columns 332 on both sides of the locking piece 330 are respectively snapped into the snap-in groove 321 or the clearance groove 322 on both the shell and the cover plate 324.

[0045] Reference Figures 5 to 7 According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the telescopic sleeve 310 includes an upper shell 315 and a lower shell 316, and the upper shell 315 and the lower shell 316 are connected to define a square telescopic channel 311. The telescopic member 320 is square in shape and matches the shape of the telescopic channel 311. The square telescopic channel 311 cooperates with the square telescopic member 320 to limit the rotational movement of the telescopic member 320, thereby preventing the telescopic member 320 from rotating during the telescopic process and causing the lumbar support 200 to change its position.

[0046] It should be noted that the yielding portion 313 and the clamping portion 314 can be integrally formed with the lower shell 316, or can be independent components and then fixed to the lower shell 316 by fasteners. The yielding portion 313 is provided with an inclined wall on the side close to the gear slot 312, and when the latch tooth 331 slides over the inclined wall, it can drive the locking member 330 to disengage the locking member 330 from the clamping slot 321.

[0047] Reference Figures 5 to 7 According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the upper shell 315 is provided with multiple upper connecting parts, and the multiple upper connecting parts are placed on the opposite sides of the upper shell 315, and multiple lower connecting parts are provided. The multiple upper connecting parts correspond to the multiple lower connecting parts one by one and are connected by fasteners. The cooperation between the multiple upper connecting parts and the multiple lower connecting parts can better fix the upper shell 315 and the lower shell 316.

[0048] Reference Figures 5 to 7 According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the inner wall of the telescopic sleeve 310 is provided with a guide groove 317 extending in the front-to-back direction, the guide groove 317 is connected to the telescopic channel 311, and the outer wall of the telescopic member 320 is provided with a guide block 325, the guide block 325 is inserted into the guide groove 317 and can slide in the guide groove 317, the guide groove 317 cooperates with the guide block 325 to realize the function of limiting the telescopic member 320 in the telescopic channel 311, and can also avoid the position deviation of the telescopic member 320 during the sliding process.

[0049] It is understandable that two guide grooves 317 are provided on the inner wall of the telescopic sleeve 310 , and guide blocks 325 are provided on opposite sides of the telescopic member 320 , and the guide blocks 325 correspond to each other and are inserted into the guide grooves 317 one by one.

[0050] Reference Figures 2 to 4 According to the lumbar support device provided by the embodiment of the first aspect of the utility model, the back support 100 is provided with a sliding column 110, a receiving cavity is provided in the middle of the sliding column 110, and the telescopic assembly 300 is provided in the receiving cavity, which is conducive to improving the compactness of the structure. A sliding sleeve 210 is provided on the rear side of the lumbar support 200, and the sliding sleeve 210 is sleeved on the outer periphery of the sliding column 110 and can slide forward and backward. The sliding column 110 cooperates with the sliding sleeve 210 to guide the lumbar support 200 and prevent the position of the lumbar support 200 from being offset. The telescopic member 320 is connected to the sliding sleeve 210 by a fastener, and the connection method between the telescopic member 320 and the sliding sleeve 210 is simple and reliable.

[0051] Reference Figure 2 and Figure 3 According to the lumbar support device provided by the embodiment of the first aspect of the utility model, a rotating shaft 230 is provided on the front side of the sliding sleeve 210, and the lower end of the lumbar support 200 is connected to the rotating shaft 230 and can be pitched and rotated. When the user's waist abuts against the lumbar support 200, the lumbar support 200 can move with the user's waist to better support the user's waist.

[0052] Reference Figure 2 and Figure 3 According to the lumbar support device provided by the embodiment of the first aspect of the utility model, an elastic support member 240 is arranged between the lumbar support 200 and the sliding sleeve 210. The elastic support member 240 is located on the upper side of the rotating shaft 230. One end of the elastic support member 240 abuts against the sliding sleeve 210, and the other end abuts against the lumbar support 200. The elastic support member 240 can provide elastic force for the lumbar support 200 to make the lumbar support 200 fit the user's waist more closely.

[0053] Reference Figures 2 to 4 According to the lumbar support device provided by the embodiment of the first aspect of the utility model, a guide column 120 is arranged in the accommodating cavity, a guide sleeve 220 is arranged inside the sliding sleeve 210, and the guide column 120 is inserted into the guide sleeve 220. During the process of adjusting the position of the lumbar support 200, the guide column 120 can slide back and forth in the guide sleeve 220, which can prevent the position of the lumbar support 200 from being offset during the adjustment process.

[0054] Reference Figures 2 to 4According to the lumbar support device provided by the embodiment of the first aspect of the utility model, a plurality of guide posts 120 are arranged in the accommodating cavity, and the plurality of guide posts 120 are arranged at intervals along the circumference of the accommodating cavity. A plurality of guide sleeves 220 are arranged inside the sliding sleeve 210, and the plurality of guide posts 120 correspond to each other one by one and are plugged into the plurality of guide sleeves 220. The plurality of guide posts 120 cooperate with the plurality of guide sleeves 220, which is beneficial to improving the reliability of the guidance.

[0055] It should be noted that after the multiple guide posts 120 correspond one by one and are plugged into the multiple guide sleeves 220, they can limit the circumferential movement of the sliding sleeves 210210, and prevent the lumbar support 200 and the sliding sleeves 210 from rotating during adjustment or use.

[0056] The seat provided according to the second embodiment of the utility model comprises the lumbar support device of the first embodiment of the utility model, and has all the beneficial effects of the lumbar support device.

[0057] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit it. The present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A lumbar support device, characterized in that: include: Back support; A lumbar support connected to the back support via a telescopic assembly; The telescopic assembly comprises a telescopic sleeve, a telescopic member, a locking member and an elastic member, one end of the telescopic sleeve is connected to the back bracket, a telescopic channel extending in the front-to-back direction is arranged inside the telescopic sleeve, a yielding portion, a clamping portion and a plurality of gear slots are arranged on the bottom wall of the telescopic channel, the yielding portion is located at the front side of the telescopic channel, the clamping portion is located at the rear side of the telescopic channel, a plurality of gear slots are arranged between the yielding portion and the clamping portion at intervals in the front-to-back direction, a blocking surface is arranged on the rear side of the gear slot, and a guiding surface inclined upward is provided on the front side, and the upper end of the guiding surface is flush with the bottom wall of the telescopic channel; The telescopic member is arranged in the telescopic passage and can slide forward and backward, the locking member has a latch and a connecting column, the telescopic member is provided with a latching groove and a clearance groove which are interconnected, the locking member is movably connected to the telescopic member, the elastic member is arranged between the telescopic member and the locking member, when the connecting column is located in the latching groove, the elastic member can push the locking member to make the latch engage in the gear groove; when the connecting column is located in the clearance groove, the latch is separated from the gear groove; Wherein, the lumbar support is connected to the front end of the telescopic member, and when the connecting post is located in the engaging groove, the latch tooth is engaged with the gear slot, and the rear side abuts against the blocking surface; when the telescopic member moves forward, the latch tooth slides through a plurality of the gear slots and abuts against the giving way portion, and the giving way portion can push the latch tooth to drive the connecting post to engage in the giving way slot, so that the latch tooth and the gear slot remain separated; when the telescopic member moves backward, the latch tooth moves backward along the telescopic channel and abuts against the engaging portion, and the engaging portion can push the latch tooth to drive the connecting post to engage in the engaging slot, and the elastic member can push the locking member to enable the latch tooth to engage in the gear slot.

2. The lumbar support device according to claim 1, characterized in that: The telescopic sleeve comprises an upper shell and a lower shell, wherein the upper shell is connected to the lower shell to define a square telescopic channel, and the shape of the telescopic member matches the shape of the telescopic channel.

3. The lumbar support device according to claim 2, characterized in that: The upper shell is provided with a plurality of upper connection parts, and the plurality of upper connection parts are placed on two opposite sides of the upper shell. The upper shell is provided with a plurality of lower connection parts, and the plurality of upper connection parts correspond to the plurality of lower connection parts one by one and are connected by fasteners.

4. The lumbar support device according to claim 1, characterized in that: The inner wall of the telescopic sleeve is provided with a guide groove extending in the front-rear direction, and the outer wall of the telescopic member is provided with a guide block, which is inserted into the guide groove and can slide in the guide groove.

5. The lumbar support device according to claim 1, characterized in that: The back support is provided with a sliding column, a receiving cavity is provided in the middle of the sliding column, the telescopic component is provided in the receiving cavity, a sliding sleeve is provided on the rear side of the lumbar support, the sliding sleeve is provided on the outer periphery of the sliding column and can slide forward and backward, and the telescopic component is connected to the sliding sleeve through a fastener.

6. The lumbar support device according to claim 5, characterized in that: A rotating shaft is arranged on the front side of the sliding sleeve, and the lower end of the waist support is connected to the rotating shaft and can be rotated in pitch and in descending direction.

7. The lumbar support device according to claim 6, characterized in that: An elastic support member is arranged between the lumbar support and the sliding sleeve. The elastic support member is located on the upper side of the rotating shaft. One end of the elastic support member abuts against the sliding sleeve, and the other end abuts against the lumbar support.

8. The lumbar support device according to claim 5, characterized in that: A guide column is arranged in the accommodating cavity, a guide sleeve is arranged inside the sliding sleeve, and the guide column is plugged into the guide sleeve.

9. The lumbar support device according to claim 8, characterized in that: A plurality of guide posts are arranged in the accommodating cavity and are arranged at intervals along the circumference of the accommodating cavity. A plurality of guide sleeves are arranged inside the sliding sleeve, and the plurality of guide posts correspond to each other one by one and are plugged into the plurality of guide sleeves.

10. A seat, characterized in that: Comprising a lumbar support device as claimed in any one of claims 1 to 9.

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