Back supporting device and seat

Abstract

The back supporting device comprises a back support and a waist supporting assembly, a connecting plate is arranged on the lower side of the back support, a sliding groove and a containing cavity are formed in the front side of the connecting plate, the containing cavity is located on one side of the sliding groove and communicated with the sliding groove, a locking piece is arranged in the containing cavity, and the waist supporting assembly is arranged on the waist supporting assembly. The side, facing the sliding groove, of the locking piece is provided with locking teeth. The waist supporting assembly comprises a connecting base, the connecting base is arranged in the sliding groove and can slide up and down, and a plurality of gear grooves are formed in the side, close to the containing cavity, of the connecting base. An elastic piece is arranged between the side wall of the containing cavity and the locking piece, and the elastic piece is configured to enable the locking piece to enable the locking teeth to be clamped into the gear grooves. According to the back supporting device provided by the utility model, the stability and the reliability of waist supporting are ensured, and the requirement of a user for adjusting the position of the waist rest according to personal requirements is met, so that the comfort of a seat and the user experience are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a back support device and a seat. Background Art

[0002] The structure of the seat includes a seat cushion, a back support, armrests and a lumbar support. The lumbar support can provide support for the human waist and can greatly improve comfort. However, in related technologies, 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 experience. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a back support device that not only ensures the stability and reliability of lumbar support, but also satisfies the user's need to adjust the lumbar support position according to personal needs, thereby greatly improving the comfort of the chair and the user experience.

[0004] In a second aspect, the present invention also proposes a chair using the above-mentioned back support device.

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

[0006] A back bracket, with a connecting plate provided on the lower side, a slide groove and an accommodating cavity provided on the front side of the connecting plate, the accommodating cavity being located on one side of the slide groove and communicating with the slide groove, a locking member being provided in the accommodating cavity, and a locking tooth being provided on the side of the locking member facing the slide groove;

[0007] A lumbar support assembly includes a connecting seat, the connecting seat is arranged in the slide groove and can slide up and down, and a side of the connecting seat close to the accommodating cavity is provided with a plurality of gear slots;

[0008] Wherein, an elastic member is provided between the side wall of the accommodating cavity and the locking member, and the elastic member is configured to enable the locking member to engage the locking tooth into the gear slot.

[0009] The back support device provided by the embodiment of the first aspect of the present invention has at least the following beneficial effects: by designing a slide groove and a receiving cavity on the connecting plate of the back support, and cooperating with the connecting seat and gear slot of the lumbar support assembly, the lumbar support position is adjustable. Specifically, the combination of the locking member and the elastic member enables the locking teeth to be securely engaged in the gear slots at different heights, which not only ensures the stability and reliability of the lumbar support, but also satisfies the user's need to adjust the lumbar support position according to personal needs, thereby greatly improving the comfort of the seat and the user experience. In addition, the design is simple in structure and easy to operate, without the need for complex adjustment mechanisms, which reduces manufacturing costs and improves the market competitiveness of the product.

[0010] According to the back support device provided by the embodiment of the first aspect of the present utility model, the gear slot is a one-way slot, the accommodating cavity includes an installation slot and a yield slot that are interconnected, the locking piece is arranged in the installation slot, and the connecting seat is provided with a guide surface, and the guide surface is connected to the inclined wall of the gear slot located at the lower end. When the connecting seat slides upward, the locking tooth slides over the guide surface, and the guide surface can guide the locking tooth so that the end of the locking piece is aligned with and stuck in the yield slot, and the locking tooth remains separated from the gear slot.

[0011] According to the back support device provided by the embodiment of the first aspect of the present invention, the connecting seat is provided with a reset surface, and the reset surface is connected to the inclined wall of the gear slot located at the uppermost end. When the connecting seat slides downward, the lock tooth slides over the reset surface, and the reset surface can abut and push the lock tooth to make the end of the locking member disengage from the makeshift slot, and the lock tooth is stuck in the gear slot.

[0012] According to the back support device provided by the embodiment of the first aspect of the present utility model, the connecting seat includes a slide plate and a telescopic sleeve, the gear groove is arranged on the side of the slide plate close to the accommodating cavity, and the back support device also includes a fixing plate, and the middle part of the fixing plate is provided with a through groove for the telescopic sleeve to pass through. The fixing plate is connected to the back bracket so as to confine the slide plate in the sliding groove, and the telescopic sleeve passes through and extends to the front side.

[0013] According to the back support device provided by the embodiment of the first aspect of the present invention, an annular adjustment boss is provided in the telescopic sleeve, and a plurality of adjustment slots arranged along the front-to-back direction are provided on the circumference of the adjustment boss. The lumbar support assembly also includes an adjustment member, a driving member and a lumbar support bracket. A connecting tube is provided in the middle of the lumbar support bracket, and the connecting tube is inserted into the telescopic sleeve. The adjustment member is provided at the rear end of the connecting tube and the end portion abuts the adjustment slot. The driving member is provided in the connecting tube and extends to the front end of the connecting tube. Rotating the driving member can drive the adjustment member to rotate, and the end portion of the adjustment member can slide through the plurality of adjustment slots, thereby driving the lumbar support bracket to move forward and backward.

[0014] According to the back support device provided by the embodiment of the first aspect of the present invention, the lumbar support assembly also includes a guide column, a connecting column extending in the front-to-back direction is provided in the middle of the connecting seat, the guide column is connected to the connecting column and is arranged in the front-to-back direction, the adjusting member and the driving member are both cylindrical, the guide column is passed through the adjusting member and the driving member, and the adjusting member and the driving member can slide along the guide column.

[0015] According to the back support device provided by the embodiment of the first aspect of the present invention, the lumbar support assembly further includes a tensioning spring, a front end of the guide column is provided with a surrounding edge, one end of the tensioning spring abuts the driving member, and the other end abuts the surrounding edge.

[0016] According to the back support device provided by the embodiment of the first aspect of the present invention, the driving member adjusting member is provided with two slots at intervals, and the rear end of the driving member is provided with two insertion rods, and the two insertion rods are respectively inserted into the two slots.

[0017] According to the back support device provided by the embodiment of the first aspect of the present invention, a handle is provided at the outer end of the driving member, and the handle is configured to drive the driving member to rotate.

[0018] The chair provided in accordance with the embodiment of the second aspect of the present invention comprises the back support device as described in the embodiment of the first aspect of the present invention, and the chair has all the beneficial effects of the back support device.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 An overall schematic diagram of a back support device provided in an embodiment of the present utility model;

[0022] Figure 2 A schematic diagram of the connection between the connecting plate and the connecting seat provided in an embodiment of the present utility model;

[0023] Figure 3 A schematic structural diagram of a lumbar support assembly provided in an embodiment of the present utility model;

[0024] Figure 4 An exploded schematic diagram of a lumbar support assembly provided in an embodiment of the present invention;

[0025] Figure 5 A cross-sectional view of a lumbar support assembly provided by an embodiment of the present invention;

[0026] Figure 6 This is a structural schematic diagram of the connecting socket provided in an embodiment of the utility model.

[0027] The accompanying figures are as follows:

[0028] Back support 100; connecting plate 110; slide groove 120; accommodating cavity 130; mounting groove 131; clearance groove 132; locking member 140; locking tooth 141; elastic member 150; fixing plate 160;

[0029] Lumbar support assembly 200; connecting seat 210; gear slot 211; guide surface 212; reset surface 213; slide plate 214; telescopic sleeve 215; adjustment boss 216; adjustment slot 217; connecting column 218; adjustment member 220; slot 221; driving member 230; insertion rod 231; handle 232; lumbar support bracket 240; connecting tube 241; guide column 250; tensioning spring 260. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of this 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 relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting 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.

[0034] An embodiment of the present invention provides a back support device for use in a seat. The specific structure and function of the back support device provided by the embodiment of the present invention will be further described below with reference to text and drawings.

[0035] Reference Figures 1 to 4According to an embodiment of the first aspect of the present invention, a back support device is provided, comprising: a back support 100 and a lumbar support assembly 200. A connecting plate 110 is provided on the lower side of the back support 100, and a slide groove 120 and a receiving cavity 130 are provided on the front side of the connecting plate 110. The receiving cavity 130 is located on one side of the slide groove 120 and is connected to the slide groove 120. This design facilitates the interaction of the lumbar support assembly 200 with the components in the receiving cavity 130 when sliding up and down in the slide groove 120. A locking member 140 is provided in the receiving cavity 130, and a locking tooth 141 is provided on the side of the locking member 140 facing the slide groove 120. The lumbar support assembly 200 includes a connecting seat 210, which is provided in the slide groove 120 and can slide up and down along the slide groove 120. A plurality of shift slots 211 are provided on one side of the connector 210 near the accommodating cavity 130. These shift slots 211 cooperate with locking teeth 141 to lock the lumbar support assembly 200 at different heights. An elastic member 150 is provided between the sidewall of the accommodating cavity 130 and the locking member 140. The elastic member 150 can be an elastic element such as a spring. The elastic member 150 is configured to push the locking member 140 toward the sliding groove 120, allowing the locking teeth 141 to engage with the shift slots 211, thereby firmly locking the lumbar support assembly 200. When the user needs to adjust the lumbar support position, they only need to push or pull the lumbar support assembly 200 with a slight force to cause the locking teeth 141 to disengage from the current shift slot 211 and slide into another shift slot 211, thereby adjusting the lumbar support position.

[0036] According to the back support device provided by the embodiment of the first aspect of the present invention, the adjustability of the lumbar support position is achieved by designing the slide groove 120 and the accommodating cavity 130 on the connecting plate 110 of the back bracket 100, and cooperating with the connecting seat 210 and the gear slot 211 of the lumbar support assembly 200. Specifically, the combination of the locking member 140 and the elastic member 150 enables the locking teeth 141 to be firmly engaged in the gear slots 211 of different heights, which not only ensures the stability and reliability of the lumbar support, but also satisfies the user's need to adjust the lumbar support position according to personal needs, thereby greatly improving the comfort of the seat and the user experience. In addition, the design has a simple structure, is easy to operate, does not require a complex adjustment mechanism, reduces manufacturing costs, and improves the market competitiveness of the product.

[0037] Reference Figures 2 to 4According to the back support device provided by the first embodiment of the present invention, the shift slot 211 is designed as a one-way slot that opens downward. This means that the locking tooth 141 can only slide into and engage with the shift slot 211 from a single direction (i.e., upward), thereby ensuring the stability and safety of the lumbar support assembly 200 during adjustment and use. The accommodating cavity 130 is further divided into a connecting mounting slot 131 and a clearance slot 132. The mounting slot 131 accommodates the locking member 140, while the clearance slot 132 is designed to retain the end of the locking member 140, keeping the locking tooth 141 separated from the shift slot 211, thereby unlocking the lumbar support assembly 200. The locking member 140 is positioned within the mounting slot 131, with its locking tooth 141 facing the slide slot 120, ready to engage with the shift slot 211 on the connecting base 210. The connecting base 210 is provided with a guide surface 212 that connects to the slanted wall of the shift slot 211 at the bottom end. When the connecting base 210 slides upward to the highest adjustment position, the locking tooth 141 slides past the lowest gear slot 211 and then continues to slide past the guide surface 212. The guide surface 212 effectively guides the locking tooth 141, allowing the end of the locking member 140 to align with and engage the clearance slot 132 during the sliding process, thereby maintaining the locking tooth 141 and the gear slot 211. At this point, the connecting base 210 can slide downward to the lowest adjustment position. With this design, the user can easily adjust the height of the lumbar support assembly 200 without worrying about the locking member 140 accidentally getting stuck in an unintended gear slot 211 during the sliding process, or causing damage.

[0038] Reference Figure 2 、 Figures 4 to 6 According to the back support device provided by the first embodiment of the present invention, the connecting base 210 is provided with a reset surface 213, which is tightly connected to the inclined wall of the uppermost shift slot 211. When the user slides the lumbar support assembly 200 downward to a lower position, the connecting base 210 slides downward with it. The locking teeth 141 then abut against the reset surface 213, pushing the locking teeth 141 as they slide past. This pushing action allows the end of the locking member 140 to disengage from the clearance slot 132. At the same time, due to the one-way design of the shift slot 211, the locking teeth 141 naturally slide back into the shift slot 211, guided by the reset surface 213. This design ensures that the lumbar support assembly 200 is smoothly and accurately locked in its new position when it slides downward, preventing loosening or instability caused by the locking member 140 not properly engaging the shift slot 211. At the same time, the presence of the reset surface 213 also enables the user to more easily adjust the height of the lumbar support assembly 200 without additional operation or force, thereby improving the usability of the product and the user experience.

[0039] Refer to 1 and Figure 2According to the first embodiment of the present invention, the back support device provided by the connecting base 210 includes a slide plate 214 and a telescopic sleeve 215. The slide plate 214 is the main load-bearing portion of the connecting base 210. Positioning slots 211 are provided on the side of the slide plate 214 near the accommodating cavity 130. These positioning slots 211 engage with the locking teeth 141 on the locking member 140 to lock the lumbar support assembly 200 at different heights. The telescopic sleeve 215 is located in front of the slide plate 214. The back support device also includes a fixing plate 160. A through slot is defined in the middle of the fixing plate 160. The slot's size and shape match the telescopic sleeve 215, allowing the sleeve 215 to pass through and extend forward. The fixing plate 160 is connected to the back support 100 via a suitable connection method (such as bolts), thereby confining the slide plate 214 within the slide slot 120. This design ensures that the slide plate 214 does not escape from the slide slot 120 during its upward and downward sliding motion, thus ensuring the stability and safety of the lumbar support assembly 200.

[0040] Reference Figures 4 to 6 According to the back support device provided by the first embodiment of the present invention, an annular adjustment boss 216 is provided within the telescopic sleeve 215. The adjustment boss 216 is coaxial with the telescopic sleeve 215 and is circumferentially provided with a plurality of adjustment slots 217 arranged in the front-to-back direction. The number and spacing of these adjustment slots 217 are designed according to actual needs to enable front-to-back adjustment of the lumbar support assembly 200. The lumbar support assembly 200 also includes an adjustment member 220, a drive member 230, and a lumbar support bracket 240. The lumbar support bracket 240 is the main load-bearing component of the lumbar support. A connecting tube 241 is provided in the center of the connecting tube 241, which is inserted into the telescopic sleeve 215 and maintains a relative sliding relationship with the telescopic sleeve 215. The adjustment member 220 is located at the rear end of the connecting tube 241, with its end abutting the adjustment slots 217. The drive member 230 is located within the connecting tube 241 and extends to the front end of the connecting tube 241. The user can rotate the adjustment member 220 by rotating the drive member 230. To adjust the lumbar support assembly 200's fore-aft position, the user simply rotates the driver 230, which in turn drives the adjustment member 220 to rotate within the connecting tube 241. Because the end of the adjustment member 220 abuts the adjustment slots 217, as the adjustment member 220 rotates, it slides through the multiple adjustment slots 217, thereby driving the lumbar support bracket 240 fore-aft movement. This design allows the user to precisely adjust the lumbar support assembly 200's fore-aft position based on their personal comfort and usage needs.

[0041] Furthermore, because the adjustment slots 217 are arranged in the front-to-back direction, the adjustment member 220 can maintain stable contact with the adjustment slots 217 during rotation, ensuring the stability and safety of the lumbar support assembly 200 during adjustment. Furthermore, the arrangement of the drive member 230 and the adjustment member 220 also allows the user to easily adjust the lumbar support assembly 200 in the front-to-back direction, improving the product's usability and user experience.

[0042] Reference Figures 4 to 6 According to the back support device provided by the first embodiment of the present invention, the lumbar support assembly 200 further includes a guide post 250, which is connected to the connecting post 218 in the middle of the connecting base 210 and arranged in a front-to-back direction. The connecting post 218 is a key component of the connecting base 210. Its front-to-back extension provides a stable connection for the guide post 250. The material and diameter of the guide post 250 are selected based on actual needs to ensure that it can withstand the forces and pressures applied during the adjustment of the lumbar support assembly 200. The adjusting member 220 and the driving member 230 are both cylindrical in structure. This design allows them to fit tightly around the guide post 250 and slide along it. When the user rotates the driving member 230, it drives the adjusting member 220 to rotate along it. Furthermore, because both the adjusting member 220 and the driving member 230 can slide along the guide post 250, they maintain their position during rotation, ensuring the stability and smoothness of the lumbar support assembly 200 during adjustment. The presence of the guide post 250 not only provides clear guidance and support for the adjusting member 220 and the driving member 230 during rotation and sliding, but also prevents them from shaking or getting stuck during adjustment. This design allows users to more easily adjust the lumbar support assembly 200 in the forward and backward directions, improving the product's usability and user experience.

[0043] Reference Figure 4 and Figure 5According to the back support device provided by the embodiment of the first aspect of the present invention, the lumbar support assembly 200 further includes a tension spring 260 disposed between the guide post 250 and the driver 230. A rim is provided at the front end of the guide post 250. This design not only provides a stable abutment surface for the tension spring 260 but also ensures the stability and safety of the tension spring 260 during compression and extension. One end of the tension spring 260 abuts the driver 230, while the other end abuts the rim. When the user rotates the driver 230 to adjust the front-to-back position of the lumbar support assembly 200, the tension spring 260 is compressed. Due to the presence of the tension spring 260, when the user stops rotating the driver 230, the tension spring 260 generates a certain rebound force, allowing the lumbar support assembly 200 to remain stably in the position set by the user, preventing positional displacement caused by external forces or vibration.

[0044] Furthermore, the design of the tension spring 260 enhances the smoothness and feel of adjustment during the lumbar support assembly 200. When the user rotates the driver 230, the tension spring 260 provides a certain damping effect, allowing the user to more accurately perceive the adjustment range and position, thereby improving the product's usability and user experience.

[0045] Reference Figure 4 and Figure 5 According to the back support device provided by the first embodiment of the present invention, two slots 221 are spaced apart from the drive member 230 and the adjustment member 220. The position and spacing of the two slots 221 are precisely designed based on actual needs to ensure a tight fit with the insertion rods 231 on the drive member 230. Accordingly, two insertion rods 231 are provided at the rear end of the drive member 230. The shape and size of these two insertion rods 231 match the slots 221 and can be inserted into the two slots 221 on the adjustment member 220, respectively. When the user needs to adjust the front-to-back position of the lumbar support assembly 200, they simply rotate the drive member 230. Since the drive member 230 and the adjustment member 220 are connected by the slots 221 and the insertion rods 231, the rotation of the drive member 230 will also drive the adjustment member 220 to rotate together. Furthermore, the design of the slots 221 and the insertion rods 231 ensures a stable connection between the drive member 230 and the adjustment member 220 during rotation, preventing inaccurate or ineffective adjustment due to a loose connection.

[0046] Furthermore, the connection between the slot 221 and the rod 231 facilitates the removal and installation of the driver 230 and the adjusting member 220. When the user needs to replace or repair the driver 230 or the adjusting member 220, they can simply remove the rod 231 from the slot 221 to separate the driver 230 and the adjusting member 220, thereby facilitating subsequent replacement or repair operations.

[0047] Reference Figures 3 to 5 According to the back support device provided by the first embodiment of the present invention, a handle 232 is provided at the outer end of the driver 230. The handle 232 is tightly connected to the driver 230 and is configured to conveniently rotate the driver 230. The shape and size of the handle 232 are designed based on ergonomic principles to ensure that the user can comfortably grip and rotate the handle 232. When the user needs to adjust the front-to-back position of the lumbar support assembly 200, they simply grip and rotate the handle 232. This rotation of the handle 232 rotates the driver 230 as well. Due to the tight connection between the handle 232 and the driver 230, the user can easily adjust the lumbar support assembly 200 by rotating the handle 232. The design of the handle 232 not only makes rotating the driver 230 more convenient and labor-saving, but also improves the user's operating experience. The user can adjust the lumbar support assembly 200 by rotating the handle 232, rather than directly rotating the driver 230. This avoids the hand discomfort and operational inconvenience that would otherwise be caused by directly rotating the driver 230.

[0048] The chair provided according to the embodiment of the second aspect of the present invention includes the back support device according to the embodiment of the first aspect of the present invention, and the chair has all the beneficial effects of the back support device.

[0049] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A back support device, characterized in that: include: A back bracket, with a connecting plate provided on the lower side, a slide groove and an accommodating cavity provided on the front side of the connecting plate, the accommodating cavity being located on one side of the slide groove and communicating with the slide groove, a locking member being provided in the accommodating cavity, and a locking tooth being provided on the side of the locking member facing the slide groove; A lumbar support assembly includes a connecting seat, the connecting seat is arranged in the slide groove and can slide up and down, and a side of the connecting seat close to the accommodating cavity is provided with a plurality of gear slots; Wherein, an elastic member is provided between the side wall of the accommodating cavity and the locking member, and the elastic member is configured to enable the locking member to engage the locking tooth into the gear slot.

2. The back support device according to claim 1, wherein: The gear slot is a one-way slot, and the accommodating cavity includes an installation slot and a yield slot that are interconnected. The locking piece is arranged in the installation slot, and the connecting seat is provided with a guide surface, and the guide surface is connected to the inclined wall of the gear slot located at the lower end. When the connecting seat slides upward, the locking tooth slides over the guide surface, and the guide surface can guide the locking tooth so that the end of the locking piece is aligned with and stuck in the yield slot, and the locking tooth remains separated from the gear slot.

3. The back support device according to claim 2, wherein: The connecting seat is provided with a reset surface, and the reset surface is connected to the inclined wall of the gear slot located at the uppermost end. When the connecting seat slides downward, the lock tooth slides over the reset surface, and the reset surface can abut and push the lock tooth to make the end of the locking member disengage from the give way slot and the lock tooth snap into the gear slot.

4. The back support device according to claim 1, wherein: The connecting seat includes a slide plate and a telescopic sleeve, the gear groove is arranged on the side of the slide plate close to the accommodating cavity, and the back support device also includes a fixing plate, a through groove for the telescopic sleeve to pass through is provided in the middle of the fixing plate, and the fixing plate is connected to the back bracket to confine the slide plate in the sliding groove, and the telescopic sleeve passes through and extends to the front side.

5. The back support device according to claim 4, characterized in that An annular adjustment boss is provided in the telescopic sleeve, and a plurality of adjustment slots arranged in the front-to-back direction are provided on the circumference of the adjustment boss. The lumbar support assembly also includes an adjusting member, a driving member and a lumbar support bracket. A connecting tube is provided in the middle of the lumbar support bracket, and the connecting tube is inserted into the telescopic sleeve. The adjusting member is provided at the rear end of the connecting tube and the end portion abuts the adjustment slot. The driving member is provided in the connecting tube and extends to the front end of the connecting tube. Rotating the driving member can drive the adjusting member to rotate, and the end portion of the adjusting member can slide through the plurality of adjustment slots, thereby driving the lumbar support bracket to move forward and backward.

6. The back support device according to claim 5, characterized in that The lumbar support assembly also includes a guide column, a connecting column extending in the front-to-back direction is provided in the middle of the connecting seat, the guide column is connected to the connecting column and is arranged in the front-to-back direction, the adjusting member and the driving member are both cylindrical, the guide column is passed through the adjusting member and the driving member, and the adjusting member and the driving member can slide along the guide column.

7. The back support device according to claim 6, wherein: The lumbar support assembly further comprises a tensioning spring. The front end of the guide column is provided with a surrounding edge. One end of the tensioning spring abuts against the driving member, and the other end abuts against the surrounding edge.

8. The back support device according to claim 5, wherein: The driving member adjusting member is provided with two slots at intervals, and the rear end of the driving member is provided with two insertion rods, which are respectively inserted into the two slots.

9. The back support device according to claim 5, wherein: A handle is provided at the outer end of the driving member, and the handle is configured to drive the driving member to rotate.

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

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