Backrest device and seat

Abstract

The utility model discloses a backrest device and a seat, the backrest device comprises a back support, a waist rest and an adjusting assembly, and the waist rest is connected with the back support through the adjusting assembly; the adjusting assembly comprises a first adjusting piece, a second adjusting piece, a locking piece and an elastic piece, the position of the waist rest can be adjusted forwards or backwards through cooperation of the first adjusting piece, the second adjusting piece, the locking piece and the elastic piece of the adjusting assembly, 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 backrest 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 backrest device, which can adjust the position of the waist support forward or backward through an adjustment component so that the waist support can better support the user's waist and meet the use needs of customers.

[0004] In a second aspect, the utility model also proposes a seat using the backrest device.

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

[0006] Back support,

[0007] a lumbar support connected to the back support via an adjustment assembly;

[0008] The adjustment assembly includes a first adjustment member, a second adjustment member, a locking member and an elastic member, wherein the first adjustment member is connected to the back support;

[0009] The first adjusting member is connected to the back support, and is provided with a through slot, a plurality of gear slots, a dislocation portion and a return portion. The through slot is located in the middle of the first adjusting member and extends in the front-to-back direction. The dislocation portion is located at the front end of the through slot, and the return portion is located at the rear end of the through slot. A plurality of gear slots are provided at the bottom wall of the through slot and communicate with the through slot. A blocking surface is provided at the rear side of the gear slot, and an inclined wall inclined upward is provided at the front side, and the upper end of the inclined wall is flush with the bottom wall of the through slot.

[0010] The second adjusting member is connected to the first adjusting member and can move forward or backward relative to the adjusting member, the second adjusting member is provided with a return groove and a disengagement groove which are interconnected, the locking member is arranged in the return groove, the elastic member is arranged between the first adjusting member and the locking member, and the elastic member is used to push the locking member so that the locking member is located in the return groove;

[0011] In which, the lumbar support is connected to the front end of the second adjusting member, and a locking tooth is provided on the side of the locking member facing the first adjusting member; when the locking member is located in the return groove, the locking tooth is inserted into the gear groove, and the rear side abuts the blocking surface; when the second adjusting member moves forward, the locking tooth slides over the inclined wall and enters the through groove and abuts against the disengagement portion, and the disengagement portion can push the locking tooth to drive the locking member to be inserted into the disengagement groove, so that the locking tooth and the gear groove remain separated; when the second adjusting member moves backward, the locking tooth slides along the through groove and abuts against the return portion, the return portion can push the locking tooth to drive the locking member to be inserted into the return groove, and the elastic member can push the locking member to make the locking tooth inserted into the gear groove.

[0012] The backrest device provided in the embodiment of the first aspect of the utility model has at least the following beneficial effects: when the backrest device is applied to a seat, when in use, the locking teeth of the locking member are clamped 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 second adjusting 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 second adjusting member and the locking member to move forward, and the locking teeth of the locking member slide forward to engage The gear slot on the front side; when the user needs to adjust the position of the lumbar support backward, first grasp and pull the lumbar support forward, the lumbar support can drive the second adjustment member and the locking member to move forward, and when the locking tooth slides through the gear slot at the front end, the locking tooth can slide into the through slot along the inclined wall and abut against the dislocation part, at this time the locking tooth is separated from the gear slot, and at this time the lumbar support is pulled forward again, the locking tooth abuts against the dislocation part on the front side of the through slot, the dislocation part can push the locking tooth to drive the locking member to snap into the disengagement slot, so that the locking tooth remains separated from the gear slot, and at this time the user can push the lumbar support to slide backward. In the process of the lumbar support sliding backward, the second adjustment member moves backward, the locking tooth slides along the through slot and abuts against the return part, the return part can push the locking tooth to drive the locking member to snap into the return slot again, the elastic member can push the locking member to snap into the gear slot again, the locking tooth of the locking member is clamped in the gear slot at the rear side of the through slot and abuts against the blocking surface at the rear side of the gear slot, so as to support the user's waist.

[0013] According to the backrest device provided by the embodiment of the first aspect of the utility model, the adjustment assembly also includes a connecting sleeve, which is arranged on the outer periphery of the first adjustment member and the second adjustment member to limit the second adjustment member to one side of the first adjustment member.

[0014] According to the backrest device provided by the embodiment of the first aspect of the utility model, the connecting sleeve is connected to the second adjusting member, and a guide strip extending toward the second adjusting member is provided on the side of the connecting sleeve close to the first adjusting member, and a guide groove is provided on the outer wall of the first adjusting member, and the guide strip is inserted in the guide groove and can slide in the guide groove.

[0015] According to the backrest device provided by the embodiment of the first aspect of the utility model, the guide strips are arranged on the upper and lower sides of the connecting sleeve, the guide grooves are arranged on the upper and lower sides of the first adjusting member, and the two guide strips correspond to each other and are respectively inserted into the two guide grooves.

[0016] According to the backrest device provided by the embodiment of the first aspect of the utility model, the outer wall of the second adjusting member is provided with a locking boss, the connecting sleeve is provided with a locking opening, the locking boss is locked in the locking opening, so as to fix the connecting sleeve to the second adjusting member.

[0017] According to the backrest 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 adjustment component is provided in the receiving cavity, and a sliding sleeve is provided on the rear side of the lumbar support, and the sliding sleeve is provided on the outer periphery of the sliding column and can slide forward and backward.

[0018] According to the backrest 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 backrest 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] According to the backrest device provided by the embodiment of the first aspect of the utility model, the dislocation portion and the first adjusting member are an integrally formed structure; the return portion and the first adjusting member are an integrally formed structure.

[0021] The seat provided according to the embodiment of the second aspect of the utility model comprises the backrest device as described in the embodiment of the first aspect of the utility model, and the seat has all the beneficial effects of the backrest device.

[0022] 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

[0023] 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:

[0024] Figure 1 An overall schematic diagram of a backrest device provided by an embodiment of the first aspect of the utility model;

[0025] Figure 2 An exploded schematic diagram of a backrest device provided by an embodiment of the first aspect of the utility model;

[0026] Figure 3 A cross-sectional view of a backrest device provided by an embodiment of the first aspect of the utility model;

[0027] Figure 4 A schematic diagram of the structure of an adjustment assembly provided in an embodiment of the first aspect of the utility model;

[0028] Figure 5 An exploded schematic diagram of an adjustment assembly provided in an embodiment of the first aspect of the utility model;

[0029] Figure 6 A schematic diagram of the structure of the lock tooth and the return portion abutting against each other provided by the embodiment of the first aspect of the utility model;

[0030] Figure 7 A schematic diagram of another angle of abutment between the lock tooth and the return portion provided by the embodiment of the first aspect of the utility model;

[0031] Figure 8 A schematic structural diagram of a second adjusting member and a locking member provided in an embodiment of the first aspect of the utility model.

[0032] The figures are as follows:

[0033] Back support 100; sliding column 110; guide column 120;

[0034] Lumbar support 200; Sliding sleeve 210;

[0035] Adjustment assembly 300; first adjustment member 310; through slot 311; gear slot 312; disengagement portion 313; return portion 314; blocking surface 315; inclined wall 316; guide slot 317; second adjustment member 320; return slot 321; disengagement slot 322; locking boss 323; locking member 330; locking tooth 331; elastic member 340; connecting sleeve 350; guide strip 351; locking opening 352. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] To solve this problem, a first embodiment of the present invention provides a backrest device for use in a seat. The specific structure and function of the backrest device provided in the embodiment of the present invention will be further described below in conjunction with text and drawings.

[0042] Reference Figure 1 and Figure 2 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 an adjustment component 300. The lumbar support 200 is connected to the back support 100 through the adjustment component 300. The position of the lumbar support 200 can be adjusted forward and backward through the adjustment component 300, so that the lumbar support 200 can better support the user's waist and meet the customer's usage needs.

[0043] Reference Figures 3 to 8In some embodiments, the adjustment component 300 includes a first adjustment member 310, a second adjustment member 320, a locking member 330 and an elastic member 340, the first adjustment member 310 is connected to the back bracket 100; the first adjustment member 310 is connected to the back bracket 100, the first adjustment member 310 is rectangular as a whole and is arranged along the front and rear direction of the back bracket 100, the first adjustment member 310 is provided with a through slot 311, a plurality of gear slots 312, a dislocation portion 313 and a return portion 314, the through slot 311 is located in the middle of the first adjustment member 310 and extends along the front and rear direction, the dislocation portion 313 is located at the front end of the through slot 311, the return portion 314 is located at the rear end of the through slot 311, and the plurality of gear slots 312 are provided on the bottom wall of the through slot 311 and are connected to the through slot 311. The slot 311 is connected, the gear slot 312 is a one-way slot with its opening facing the front side, the rear side of the gear slot 312 is provided with a blocking surface 315, and the front side has an inclined wall 316 inclined upward, the upper end of the inclined wall 316 is flush with the bottom wall of the through slot 311; the second adjusting member 320 is movably connected to the first adjusting member 310 and can move forward or backward relative to the adjusting member, the second adjusting member 320 is provided with a return slot 321 and a disengagement slot 322 that are connected to each other, the disengagement slot 322 is located on the upper side of the return slot 321, the locking member 330 is provided in the return slot 321, the elastic member 340 is provided between the first adjusting member 310 and the locking member 330, the elastic member 340 is used to push the locking member 330 so that the locking member 330 is located in the return slot 321.

[0044] The lumbar support 200 is connected to the front end of the second adjusting member 320, and a locking tooth 331 is provided on the side of the locking member 330 facing the first adjusting member 310; when the locking member 330 is located in the return groove 321, the locking tooth 331 is inserted into the gear groove 312, and the rear side abuts the blocking surface 315; when the second adjusting member 320 moves forward, the locking tooth 331 can be inserted into the front gear groove 312; when the locking tooth 331 moves to the gear groove 312 at the front side, the locking tooth 331 slides over the inclined wall 316 on the front side of the gear groove 312 and enters The through slot 311 abuts against the disengaging portion 313, and the disengaging portion 313 can push the locking tooth 331 to drive the locking member 330 to snap into the disengaging slot 322, so that the locking tooth 331 remains separated from the gear slot 312; when the second adjusting member 320 moves backward, the locking tooth 331 slides along the through slot 311 and abuts against the returning portion 314, and the returning portion 314 can push the locking tooth 331 to drive the locking member 330 to snap into the returning slot 321, and the elastic member 340 can push the locking member 330 to make the locking tooth 331 snap into the gear slot 312.

[0045] The backrest device provided in accordance with the first embodiment of the utility model is applied to a seat. When in use, the locking tooth 331 of the locking member 330 is clamped in the gear slot 312 and abuts against the blocking surface 315 at the rear side of the gear slot 312. The blocking surface 315 can provide a supporting force for the locking member 330, and the supporting force is transmitted to the lumbar support 200 through the second adjusting 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 second adjusting member 320 and the locking member 330 to move forward, and the locking tooth 331 of the locking member 330 slides forward to be clamped into the gear slot 312 at the front side. When the user needs to adjust the position of the lumbar support 200 backward, the user grasps and pulls the lumbar support 200 forward, and the lumbar support 200 can drive the second adjusting member 320 and the locking member 330 to move forward. The locking tooth 331 of the locking member 330 slides forward to be clamped into the gear slot 312 at the front side. The lumbar support 200 is in the position, first grasp and pull the lumbar support 200 forward, the lumbar support 200 can drive the second adjusting member 320 and the locking member 330 to move forward, and when the locking tooth 331 slides through the gear slot 312 at the front end, the locking tooth 331 can slide into the through slot 311 along the inclined wall 316 and abut against the dislocation portion 313, at this time the locking tooth 331 is separated from the gear slot 312, at this time the lumbar support 200 is pulled forward again, the locking tooth 331 abuts against the dislocation portion 313 on the front side of the through slot 311, the dislocation portion 313 can push the locking tooth 331 to drive the locking member 330 to get into the disengagement slot 322, so that the locking 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 second adjustment member 320 moves backward, and the locking tooth 331 slides along the through slot 311 and abuts against the return portion 314. The return portion 314 can push the locking tooth 331 to drive the locking member 330 to be clamped into the return slot 321 again. The elastic member 340 can push the locking member 330 to make the locking tooth 331 clamped into the gear slot 312 again. The locking tooth 331 of the locking member 330 is clamped in the gear slot 312 at the rear side of the through slot 311 and abuts against the blocking surface 315 on the rear side of the gear slot 312, thereby supporting the user's waist.

[0046] Reference Figures 3 to 5 According to the backrest device provided by the embodiment of the first aspect of the utility model, the adjustment component 300 also includes a connecting sleeve 350, which is sleeved on the outer periphery of the first adjusting member 310 and the second adjusting member 320, and is used to limit the second adjusting member 320 to one side of the first adjusting member 310, so as to prevent the second adjusting member 320 from separating from the first adjusting member 310 when the second adjusting member 320 moves forward and backward, causing the locking member 330 and the elastic member 340 to fall off.

[0047] Reference Figures 4 to 6According to the backrest device provided by the embodiment of the first aspect of the utility model, the connecting sleeve 350 is connected to the second adjusting member 320, and a guide strip 351 extending toward the second adjusting member 320 is provided on the side of the connecting sleeve 350 close to the first adjusting member 310. The outer wall of the first adjusting member 310 is provided with a guide groove 317 arranged along the front-to-back direction. The guide strip 351 is inserted into the guide groove 317 and can slide in the guide groove 317. In the process of adjusting the position of the lumbar support 200, relative movement is generated between the second adjusting member 320 and the first adjusting member 310. At this time, the guide groove 317 cooperates with the guide strip 351 to guide the second adjusting member 320, so as to prevent the position of the second adjusting member 320 from being offset during the adjustment process.

[0048] Reference Figures 4 to 6 According to the backrest device provided by the embodiment of the first aspect of the utility model, guide strips 351 are provided on the upper and lower sides of the connecting sleeve 350, and guide grooves 317 are provided on the upper and lower sides of the first adjusting member 310. The two guide strips 351 correspond to each other one by one and are respectively inserted into the two guide grooves 317. The two guide grooves 317 cooperate with the two guide strips 351, which can not only prevent the position of the second adjusting member 320 from being offset during the adjustment process, but also balance the upper and lower forces of the second adjusting member 320, which is conducive to ensuring smooth sliding.

[0049] Reference Figure 7 According to the backrest device provided by the embodiment of the first aspect of the utility model, the outer wall of the second adjusting member 320 protrudes to form a locking boss 323, and the connecting sleeve 350 is provided with a locking port 352, and the locking boss 323 is locked in the locking port 352, so as to fix the connecting sleeve 350 to the second adjusting member 320, and the connection method between the connecting sleeve 350 and the second adjusting member 320 is stable and reliable.

[0050] Reference Figure 2 and Figure 3 According to the backrest device provided by the embodiment of the first aspect of the utility model, the back support 100 is provided with a sliding column 110, and a receiving cavity is provided in the middle of the sliding column 110. The adjustment component 300 is arranged 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. The sliding sleeve 210 is sleeved on the outer periphery of the sliding column 110 and can slide back and forth. The sliding column 110 cooperates with the sliding sleeve 210 to guide the lumbar support 200 to prevent the position of the lumbar support 200 from being offset.

[0051] It should be noted that the cooperation between the slide column 110 and the slide sleeve 210 can also effectively disperse the lateral force transmitted from the lumbar support 200 , thereby preventing the lumbar support 200 from being displaced due to excessive lateral force.

[0052] Reference Figure 2According to the backrest 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 is arranged inside the sliding sleeve 210, and the guide column 120 is inserted into the guide sleeve. 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, which can prevent the position of the lumbar support 200 from being offset during the adjustment process.

[0053] Reference Figure 2 According to the backrest 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 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. The plurality of guide posts 120 cooperate with the plurality of guide sleeves, which is beneficial to improving the reliability of the guidance.

[0054] It should be noted that after the multiple guide posts 120 correspond one by one and are plugged into the multiple guide sleeves, the circumferential movement of the sliding sleeve 210 can be limited to prevent the lumbar support 200 and the sliding sleeve 210 from rotating during adjustment or use.

[0055] Reference Figures 4 to 7 According to the backrest device provided by the embodiment of the first aspect of the utility model, the dislocation portion 313 and the first adjustment member 310 are an integrally formed structure, which is beneficial to improving the stability of the connection between the dislocation portion 313 and the first adjustment member 310.

[0056] In some embodiments, the return portion 314 and the first adjusting member 310 are integrally formed, which helps to improve the stability of the connection between the return portion 314 and the first adjusting member 310 .

[0057] It is understandable that the dislocation portion 313 may be an inner wall surface at the front end of the through slot 311 , and the return portion 314 may be an inner wall surface at the rear end of the through slot 311 .

[0058] The seat provided according to the second embodiment of the utility model comprises the backrest device of the first embodiment of the utility model, the seat has a chassis, and the back support 100 is fixed to the chassis of the seat by fasteners. The seat has all the beneficial effects of the backrest device.

[0059] 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 backrest device, characterized in that: include: Back support, a lumbar support connected to the back support via an adjustment assembly; The adjustment assembly includes a first adjustment member, a second adjustment member, a locking member and an elastic member, wherein the first adjustment member is connected to the back support; The first adjusting member is connected to the back support, and is provided with a through slot, a plurality of gear slots, a dislocation portion and a return portion. The through slot is located in the middle of the first adjusting member and extends in the front-to-back direction. The dislocation portion is located at the front end of the through slot, and the return portion is located at the rear end of the through slot. A plurality of gear slots are provided at the bottom wall of the through slot and communicate with the through slot. A blocking surface is provided at the rear side of the gear slot, and an inclined wall inclined upward is provided at the front side, and the upper end of the inclined wall is flush with the bottom wall of the through slot. The second adjusting member is connected to the first adjusting member and can move forward or backward relative to the adjusting member, the second adjusting member is provided with a return groove and a disengagement groove which are interconnected, the locking member is arranged in the return groove, the elastic member is arranged between the first adjusting member and the locking member, and the elastic member is used to push the locking member so that the locking member is located in the return groove; In which, the lumbar support is connected to the front end of the second adjusting member, and a locking tooth is provided on the side of the locking member facing the first adjusting member; when the locking member is located in the return groove, the locking tooth is inserted into the gear groove, and the rear side abuts the blocking surface; when the second adjusting member moves forward, the locking tooth slides over the inclined wall and enters the through groove and abuts against the disengagement portion, and the disengagement portion can push the locking tooth to drive the locking member to be inserted into the disengagement groove, so that the locking tooth and the gear groove remain separated; when the second adjusting member moves backward, the locking tooth slides along the through groove and abuts against the return portion, the return portion can push the locking tooth to drive the locking member to be inserted into the return groove, and the elastic member can push the locking member to make the locking tooth inserted into the gear groove.

2. The backrest device according to claim 1, characterized in that: The adjustment assembly further includes a connecting sleeve, which is sleeved on the outer circumference of the first adjustment member and the second adjustment member and is used to limit the second adjustment member to one side of the first adjustment member.

3. The backrest device according to claim 2, characterized in that: The connecting sleeve is connected to the second adjusting member, and a guide strip extending toward the second adjusting member is arranged on the side of the connecting sleeve close to the first adjusting member, and a guide groove is arranged on the outer wall of the first adjusting member, and the guide strip is inserted into the guide groove and can slide in the guide groove.

4. The backrest device according to claim 3, characterized in that: The guide strips are arranged on both upper and lower sides of the connecting sleeve, the guide grooves are arranged on both upper and lower sides of the first adjusting member, and the two guide strips correspond to each other and are respectively plugged into the two guide grooves.

5. The backrest device according to claim 3, characterized in that: The outer wall of the second adjusting member is provided with a locking boss, the connecting sleeve is provided with a locking opening, and the locking boss is locked in the locking opening, so as to fix the connecting sleeve to the second adjusting member.

6. The backrest 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 adjustment component is arranged in the receiving cavity, and a sliding sleeve is provided on the rear side of the lumbar support, the sliding sleeve is arranged on the outer periphery of the sliding column and can slide forward and backward.

7. The backrest device according to claim 6, 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.

8. The backrest device according to claim 7, 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.

9. The backrest device according to claim 1, characterized in that: The dislocation portion and the first adjusting member are an integrally formed structure; the return portion and the first adjusting member are an integrally formed structure.

10. A seat, characterized in that: The invention comprises a backrest device as claimed in any one of claims 1 to 9.

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