Back supporting device and seat

Abstract

The back supporting device comprises a connecting frame and a back supporting assembly, the connecting frame is provided with a connecting plate extending upwards, the front side of the connecting plate is provided with a first mounting groove and a first receding groove which are communicated with each other, a first locking piece is arranged in the first mounting groove, and a second locking piece is arranged in the second receding groove. First locking teeth are arranged on one side of the first locking piece; the back supporting assembly comprises a chair back, a through groove arranged in the vertical direction is formed in the rear side of the lower end of the chair back, a plurality of gear grooves with obliquely downward openings are formed in the side wall of the through groove, a first guide face and a first reset face are arranged in the through groove, and the first guide face is connected with the oblique wall of the gear groove located at the lowermost end. The first reset face is connected with the inclined wall of the gear groove located at the uppermost end. The chair back is slidably connected to the connecting plate, and a first elastic piece is arranged between the side wall of the first mounting groove and the first locking piece; the back supporting device not only meets different requirements of users on the back supporting height of the seat, but also improves the comfort of the seat.

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 a seat includes a seat cushion, armrests and a backrest. The backrest can provide support for the human back and can greatly improve comfort. However, in related technologies, the backrests of some seats are fixed behind the seat cushion 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 in the prior art. To this end, the present invention provides a back support device that not only meets the different needs of users for seat back support height, but also improves the comfort and practicality of the seat.

[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] The connecting frame is provided with an upwardly extending connecting plate, the front side of the connecting plate is provided with a first mounting groove and a first clearance groove that are interconnected, the first mounting groove is provided with a first locking member, and one side of the first locking member is provided with a first locking tooth;

[0007] A back support assembly comprising a chair back, wherein a through slot arranged in a vertical direction is provided on the rear side of the lower end of the chair back, a side wall of the through slot is provided with a plurality of gear slots with openings inclined downward, a first guide surface and a first reset surface are provided in the through slot, the first guide surface is connected to the inclined wall of the gear slot at the lower end, and the first reset surface is connected to the inclined wall of the gear slot at the upper end;

[0008] wherein the chair back is slidably connected to the connecting plate, the first locking piece extends forward to the through slot, and a first elastic piece is provided between the side wall of the first mounting slot and the first locking piece, the first elastic piece being configured to move the first locking piece so that the first locking tooth is engaged with the gear slot; when the chair back slides upward, the first locking tooth slides over the first guide surface, the first guide surface can guide the first locking tooth so that the end of the first locking piece is aligned with and engaged with the first yield slot, and the first locking tooth remains separated from the gear slot; when the connecting seat slides downward, the first locking tooth can abut against the first reset surface, the first reset surface can abut against and push the first locking tooth so that the end of the first locking piece is disengaged from the first yield slot, and the first locking tooth is engaged with the gear slot.

[0009] The back support device provided in accordance with the embodiment of the first aspect of the present invention has at least the following beneficial effects: the back support device realizes the height adjustment of the chair back relative to the connecting frame, which greatly improves the flexibility of the seat and the user's experience. The first locking member on the connecting frame cooperates with the gear slot in the chair back slot, which not only ensures the stability of the chair back during the adjustment process, but also makes the adjustment operation simple and easy. The provision of the first elastic member enables the first locking member to automatically snap into the gear slot, thereby realizing automatic locking of the chair back position and improving the safety of use. At the same time, by providing the first guide surface and the first reset surface at both ends of the slot, the first locking tooth can smoothly slide through and snap into or out of the gear slot when the chair back slides up and down, thereby realizing precise adjustment and reset of the chair back position. This back support device not only meets the different needs of users for the seat back support height, but also improves the comfort and practicality of the seat.

[0010] According to the back support device provided by the embodiment of the first aspect of the present invention, the back support assembly also includes a slide plate, which is connected to the rear side of the chair back and has a through hole in the middle portion connected to the through slot, the connecting frame is provided with two limiting plates, the two limiting plates define a slide slot, the slide plate is arranged in the slide slot and can slide up and down, and the first locking member passes through the through hole and extends to the through slot.

[0011] The back support device provided in accordance with the embodiment of the first aspect of the present invention further includes a lumbar support assembly, wherein the lumbar support assembly is provided on the front side of the chair back.

[0012] According to the back support device provided by the embodiment of the first aspect of the present invention, the lumbar support assembly includes a lumbar support and an adjustment structure. The lumbar support is connected to the chair back through the adjustment structure, and the position of the lumbar support can be adjusted through the adjustment structure.

[0013] According to the back support device provided by the embodiment of the first aspect of the present utility model, the adjustment structure includes a control member, a fixing member, a telescopic member, a second locking member and a second elastic member, the control member is connected to the lower end of the lumbar support, the fixing member is connected to the lower end of the chair back, the telescopic member is arranged between the control member and the fixing member, the telescopic member is provided with a plurality of stepped grooves along the telescopic direction, the second locking member has a second locking tooth and is movably connected to the fixing member, the second elastic member is arranged between the fixing member and the locking member, and the second elastic member is configured to be able to push the second locking member so that the second locking tooth is engaged in the stepped groove;

[0014] The telescopic member can be controlled to extend and retract by pushing and pulling the control member, and the second locking teeth can be sequentially inserted into different stepped grooves.

[0015] According to the back support device provided by the embodiment of the first aspect of the present invention, the stepped groove is a one-way groove, the fixing member is provided with a second installation groove and a second give way groove that are interconnected, the second locking member is arranged in the second installation groove, and pulling the control member out can drive the second locking member so that the end of the second locking member is stuck in the second give way groove. When the end of the locking member is stuck in the second give way groove, the second lock tooth remains separated from the stepped groove.

[0016] According to the back support device provided by the embodiment of the first aspect of the present invention, the fixing member is provided with a second guide surface and a second blocking surface, the second guide surface is connected to the inclined wall of the stepped groove located at the lower end, and the second blocking surface is connected to the inclined wall of the stepped groove located at the upper end, when the telescopic member is pulled out by the control member, the second locking tooth slides over the second guide surface, and the second guide surface can guide the second locking tooth so that the end of the second locking member is aligned with and stuck in the second give way groove; when the telescopic member is pushed to retract by the control member, the second blocking surface abuts the end of the second locking member, and the second blocking surface can push the second locking member so that the end of the second locking member is disengaged from the second give way groove, and the second locking tooth is stuck in the stepped groove.

[0017] According to the back support device provided by the embodiment of the first aspect of the present invention, a reset member is provided between the fixing member and the telescopic member. When the end of the second locking member is inserted into the second displacement groove, the reset member can pull the telescopic member to contract and reset.

[0018] According to the back support device provided by the embodiment of the first aspect of the present invention, the fixing member is provided with a receiving groove, and the resetting member is arranged in the receiving groove.

[0019] 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.

[0020] 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

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 An overall schematic diagram of a back support device provided in an embodiment of the present utility model;

[0023] Figure 2 An exploded schematic diagram of a back support device provided in an embodiment of the present utility model;

[0024] Figure 3 A schematic structural diagram of a connecting frame and a slide provided in an embodiment of the present utility model;

[0025] Figure 4 A schematic structural diagram of a connecting frame provided in an embodiment of the present utility model;

[0026] Figure 5 A schematic structural diagram of the lower end of a chair back provided in an embodiment of the present utility model;

[0027] Figure 6 A schematic structural diagram of a lumbar support assembly provided in an embodiment of the present utility model;

[0028] Figure 7 A cross-sectional view of the adjustment structure provided by an embodiment of the present utility model;

[0029] Figure 8 This is a schematic diagram of an exploded view of the adjustment structure provided in an embodiment of the present utility model.

[0030] The accompanying figures are as follows:

[0031] Connecting frame 100; connecting plate 110; first mounting slot 111; first clearance slot 112; first locking member 120; first locking tooth 121; first elastic member 130; limiting plate 140;

[0032] Back support assembly 200; chair back 210; through slot 211; gear slot 212; first guide surface 213; first reset surface 214; slide plate 220;

[0033] Lumbar support assembly 300; lumbar support 310; adjustment structure 320; control member 321; fixing member 322; second mounting slot 3221; second clearance slot 3222; telescopic member 323; stepped slot 3231; second guide surface 3232; second blocking surface 3233; second locking member 324; second elastic member 325; reset member 326. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Reference Figures 1 to 5According to an embodiment of the first aspect of the present invention, a back support device is provided, which includes: a connecting frame 100 and a back support assembly 200. The connecting frame 100 is provided with an upwardly extending connecting plate 110, and the front side of the connecting plate 110 is provided with a first mounting groove 111 and a first clearance groove 112 that are interconnected. A first locking member 120 is provided in the first mounting groove 111, and a first locking tooth 121 is provided on one side of the first locking member 120 for cooperating with a shift groove 212 on a chair back 210. The back support assembly 200 includes a chair back 210, and a through groove 211 arranged in a vertical direction is provided on the rear side of the lower end of the chair back 210. The side wall of the through groove 211 is provided with a plurality of shift grooves 212 with openings tilted downward. These shift grooves 212 are used to cooperate with the first locking tooth 121 on the first locking member 120 to adjust the height of the chair back 210. A first guide surface 213 and a first reset surface 214 are also provided in the through slot 211. The first guide surface 213 is connected to the inclined wall of the gear slot 212 at the lowest end, and is used to guide the first lock tooth 121 to disengage from the gear slot 212 and engage in the first clearance slot 112 when the chair back 210 slides upward. The first reset surface 214 is connected to the inclined wall of the gear slot 212 at the highest end, and is used to push the first lock tooth 121 to engage in the gear slot 212 when the chair back 210 slides downward. The chair back 210 is slidably connected to the connecting plate 110, allowing the chair back 210 to slide up and down relative to the connecting plate 110, thereby achieving height adjustment. The first locking member 120 extends forward into the through slot 211 and cooperates with the gear slot 212 to lock the position of the chair back 210. A first elastic member 130 is provided between the side wall of the first mounting groove 111 and the first locking member 120. The first elastic member 130 is configured to push the first locking member 120 toward the shift groove 212, so that the first locking tooth 121 is stuck in the shift groove 212, thereby realizing automatic locking of the position of the chair back 210.

[0040] To adjust the height of the chair back 210, the user simply slides the chair back 210 up or down. Guided by the first guide surface 213 or the first return surface 214, the first locking tooth 121 smoothly slides through and engages or disengages the shift slot 212, enabling precise adjustment of the chair back 210's height. Once the chair back 210 has slid to the desired position, the first elastic member 130 automatically engages the first locking member 120 in the corresponding shift slot 212, locking the chair back 210 in place. This simple and easy adjustment method requires no additional tools or complicated operations, significantly improving the user experience.

[0041] According to the back support device provided by the first embodiment of the present invention, the back support device enables adjustable height of the seat back 210 relative to the connecting frame 100, significantly enhancing the chair's flexibility and user experience. The first locking member 120 on the connecting frame 100 cooperates with the shift slot 212 within the through slot 211 of the seat back 210, ensuring the stability of the seat back 210 during adjustment and simplifying the adjustment process. The provision of the first elastic member 130 allows the first locking member 120 to automatically engage the shift slot 212, automatically locking the seat back 210 in place and improving safety. Furthermore, the provision of first guide surfaces 213 and first return surfaces 214 at each end of the through slot 211 allows the first locking teeth 121 to smoothly slide through and engage or disengage the shift slot 212 as the seat back 210 slides up and down, enabling precise adjustment and reset of the seat back 210. This back support device not only meets users' varying needs for the support height of the seat back 210 but also enhances the comfort and practicality of the chair.

[0042] Reference Figure 2 and Figure 3 According to the back support device provided by the embodiment of the first aspect of the present invention, the back support assembly 200 further includes a slide plate 220, which is securely connected to the rear side of the chair back 210 and has a through hole in the center thereof that communicates with the through slot 211. This allows the first locking member 120 to pass through the through hole in the slide plate 220 and then extend into the through slot 211, effectively engaging with the shift slot 212.

[0043] The connecting frame 100 is also equipped with two limiting plates 140. Specifically, these limiting plates 140 define a sliding groove. The sliding plate 220 of the back support assembly 200 is positioned within this groove. This not only ensures the stable upward and downward sliding of the sliding plate 220, thereby enabling flexible adjustment of the seat back 210 height, but also effectively limits the sliding range of the sliding plate 220 (and the seat back 210), enhancing the structural stability and safety of the entire back support device.

[0044] During actual use, when the user needs to adjust the height of the chair back 210, they simply slide the chair back 210 upward or downward, and the slide plate 220 will move up and down within the slide slot. Because the first locking member 120 passes through the through hole in the slide plate 220 and extends into the through slot 211, the first locking member 120 moves accordingly as the chair back 210 slides. Guided by the first guide surface 213 or the first return surface 214, the first locking member 120 smoothly slides through and engages or disengages the shift slot 212, thereby achieving precise height adjustment and locking of the chair back 210.

[0045] Reference Figure 1 The back support device provided by the first embodiment of the present invention further includes a lumbar support assembly 300, which is located in front of the chair back 210 to provide a more comprehensive and comfortable support experience. Furthermore, the back support assemblies 200 cooperate with each other to provide a support effect that better conforms to the user's body curves.

[0046] Reference Figure 6 According to the back support device provided by the first embodiment of the present invention, the lumbar support assembly 300 includes a lumbar support 310 and an adjustment structure 320. The lumbar support 310 is connected to the chair back 210 via the adjustment structure 320. The adjustment structure 320 serves as a bridge between the lumbar support 310 and the chair back 210, not only ensuring a stable connection between the lumbar support 310 and the chair back 210, but also providing flexibility in position adjustment of the lumbar support 310. Specifically, the adjustment structure 320 can take various forms, such as slide rails, knobs, and telescopic rods, allowing users to easily adjust the lumbar support 310 up and down, forward and backward, or at an angle according to their body shape and needs, thereby achieving optimal lumbar support.

[0047] In actual use, when the user needs to adjust the position of the lumbar support 310, they can simply operate the adjustment structure 320 to achieve precise movement and positioning of the lumbar support 310. The design of the adjustment structure 320 should ensure a smooth and seamless adjustment process and firmly lock the position of the lumbar support 310 to prevent shaking or displacement during use.

[0048] Furthermore, the adjustment structure 320 can be linked to the adjustment mechanism of the back support assembly 200, so that when the user adjusts the height of the chair back 210, the lumbar support 310 can also adjust its position accordingly to maintain an optimal fit with the user's waist. This linkage design not only improves the comfort and practicality of the chair, but also further enhances the user experience.

[0049] Reference Figures 6 to 8 According to the back support device provided by the embodiment of the first aspect of the present invention, the adjustment structure 320 includes a control member 321, a fixing member 322, a telescopic member 323, a second locking member 324 and a second elastic member 325. The control member 321 is connected to the lower end of the lumbar support 310 and serves as a direct operating end for the user to adjust the position of the lumbar support 310. The fixing member 322 is connected to the lower end of the chair back 210 to provide a stable support point for the adjustment structure 320. The telescopic member 323 is arranged between the control member 321 and the fixing member 322, and is provided with a plurality of stepped grooves 3231 along the telescopic direction. These stepped grooves 3231 provide a snap-in position for the second locking member 324, thereby realizing the adjustment of the telescopic length of the telescopic member 323.

[0050] The second locking member 324 has a second locking tooth and is movably connected to the fixing member 322. A second elastic member 325 is disposed between the fixing member 322 and the second locking member 324. It is configured to push the second locking member 324, causing the second locking tooth to engage with the stepped groove 3231 on the telescopic member 323. As a result, when the user pushes or pulls the control member 321, the telescopic member 323 expands and contracts accordingly. Simultaneously, the second locking tooth, pushed by the second elastic member 325, sequentially engages with different stepped grooves 3231, thereby achieving precise adjustment and stable locking of the lumbar support 310.

[0051] In practice, the user can easily adjust the position of the lumbar support 310 by simply pushing or pulling the control member 321. When the control member 321 is pulled, the telescopic member 323 extends, and the second locking tooth, pushed by the second elastic member 325, snaps into the next stepped groove 3231, locking the lumbar support 310 in the new position. Conversely, when the control member 321 is pushed back, the telescopic member 323 shortens, and the second locking tooth snaps into the previous stepped groove 3231. This adjustment method is not only simple and easy, but also ensures the stability and security of the lumbar support 310.

[0052] Reference Figures 6 to 8 According to the back support device provided by the embodiment of the first aspect of the present invention, the stepped groove 3231 is a one-way groove, and the second lock tooth of the second locking member 324 can only be engaged and disengaged along a single direction of the stepped groove 3231, thereby ensuring the stability and reliability of the adjustment process. The fixing member 322 is provided with a second mounting groove 3221 and a second clearance groove 3222 that are interconnected. The second mounting groove 3221 is used to accommodate the second locking member 324, ensuring that it can be firmly maintained on the fixing member 322 in the non-adjustment state. The second clearance groove 3222 is connected to the second mounting groove 3221, providing a clearance space for the end of the second locking member 324.

[0053] In practice, when the user pulls the control member 321 to extend the telescopic member 323, the control member 321 also moves the second locking member 324. Because the second locking member 324 is located within the second mounting slot 3221, its movement is restricted by the second mounting slot 3221. When the second locking member 324 reaches a certain position, its end engages the second clearance slot 3222. At this point, the second locking teeth remain separated from the stepped slot 3231, allowing the telescopic member 323 to extend and retract without being affected by the second locking teeth.

[0054] Reference Figures 6 to 8According to the back support device provided by the embodiment of the first aspect of the present invention, the fixing member 322 is provided with a second guide surface 3232 and a second blocking surface 3233. The second guide surface 3232 provided on the fixing member 322 is tightly connected to the inclined wall of the stepped groove 3231 at the lowest end. This ensures that when the user pulls the telescopic member 323 out through the control member 321, the second locking tooth can slide smoothly along the second guide surface 3232. Under the guidance of the second guide surface 3232, the end of the second locking member 324 can be accurately aligned with and snapped into the second clearance groove 3222, so that the second locking tooth remains separated from the stepped groove 3231. This not only ensures that the telescopic member 323 can extend freely and unimpeded, but also improves the convenience and accuracy of adjusting the position of the lumbar support 310.

[0055] Furthermore, the fixing member 322 is provided with a second blocking surface 3233, which connects to the inclined wall of the uppermost stepped groove 3231. When the user retracts the telescopic member 323 via the control member 321, the second blocking surface 3233 abuts the end of the second locking member 324, pushing it out of the second clearance groove 3222. At this point, the second locking teeth, pushed by the second elastic member 325, quickly snap into the corresponding stepped groove 3231, thereby stably locking the lumbar support 310. This design not only ensures the stability of the lumbar support 310's position adjustment but also improves the safety of the seat.

[0056] Reference Figure 7 According to the back support device provided by the first embodiment of the present invention, a restoring member 326 is disposed between the fixed member 322 and the telescopic member 323. When the telescopic member 323 is extended and the end of the second locking member 324 engages the second clearance groove 3222, the restoring member 326 is configured to generate a pulling force, causing the telescopic member 323 to automatically retract to its initial position. During this process, the restoring member 326 can be made of a spring, elastic band, or other material with a restoring force to ensure that it can provide sufficient pulling force to overcome the friction or resistance that may be generated when the telescopic member 323 is extended.

[0057] When the user extends the telescopic member 323 through the control member 321 and causes the end of the second locking member 324 to be stuck in the second clearance groove 3222, the reset member 326 begins to store energy. Once the user releases the control member 321, the reset member 326 will release its stored energy, pulling the telescopic member 323 to begin to retract. At the same time, under the push of the second elastic member 325, the end of the second locking member 324 will gradually disengage from the second clearance groove 3222 until the second lock tooth is re-engaged in the appropriate stepped groove 3231, completing the locking of the lumbar support 310 position. This not only ensures that the telescopic member 323 can be reliably reset after being extended, but also avoids the inconvenience of the user having to manually push back the telescopic member 323, thereby improving the usability and comfort of the back support device. In addition, the presence of the reset member 326 also helps to maintain the overall stability and durability of the seat, extending the service life of the product.

[0058] Reference Figure 7 and Figure 8 According to the back support device provided by the first embodiment of the present invention, the fixing member 322 is provided with a receiving groove. By placing the reset member 326 in the receiving groove, the reset member 326 is not only effectively protected from interference or damage from the external environment during use, but also ensures that the reset member 326 can function stably, achieving the automatic retraction and reset of the telescopic member 323. At the same time, the design of the receiving groove also takes into account the replacement and maintenance of the reset member 326, allowing the user to easily remove and replace the reset member 326 when necessary.

[0059] 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.

[0060] 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: The connecting frame is provided with an upwardly extending connecting plate, the front side of the connecting plate is provided with a first mounting groove and a first clearance groove that are interconnected, the first mounting groove is provided with a first locking member, and one side of the first locking member is provided with a first locking tooth; A back support assembly comprising a chair back, wherein a through slot arranged in a vertical direction is provided on the rear side of the lower end of the chair back, a side wall of the through slot is provided with a plurality of gear slots with openings inclined downward, a first guide surface and a first reset surface are provided in the through slot, the first guide surface is connected to the inclined wall of the gear slot at the lower end, and the first reset surface is connected to the inclined wall of the gear slot at the upper end; The seat back is slidably connected to the connecting plate, the first locking member extends forward to the through slot, a first elastic member is provided between the side wall of the first mounting slot and the first locking member, and the first elastic member is configured to engage the first locking member so that the first locking tooth engages with the shift slot; When the chair back slides upward, the first locking tooth slides over the first guide surface, and the first guide surface can guide the first locking tooth so that the end of the first locking piece is aligned with and stuck in the first give way groove, and the first locking tooth remains separated from the gear groove; when the connecting seat slides downward, the first locking tooth can abut against the first reset surface, and the first reset surface can abut against and push the first locking tooth so that the end of the first locking piece is disengaged from the first give way groove, and the first locking tooth is stuck in the gear groove.

2. The back support device according to claim 1, wherein: The back support assembly also includes a slide plate, which is connected to the rear side of the chair back and has a through hole in the middle portion connected to the through slot. The connecting frame is provided with two limit plates, which define a slide slot. The slide plate is arranged in the slide slot and can slide up and down. The first locking member passes through the through hole and extends to the through slot.

3. The back support device according to claim 1, wherein: The chair further comprises a lumbar support component, which is arranged on the front side of the chair back.

4. The back support device according to claim 3, wherein: The lumbar support assembly includes a lumbar support and an adjustment structure. The lumbar support is connected to the chair back through the adjustment structure, and the position of the lumbar support can be adjusted through the adjustment structure.

5. The back support device according to claim 4, characterized in that The adjustment structure includes a control member, a fixing member, a telescopic member, a second locking member and a second elastic member, wherein the control member is connected to the lower end of the lumbar support, the fixing member is connected to the lower end of the chair back, the telescopic member is arranged between the control member and the fixing member, the telescopic member is provided with a plurality of stepped grooves along the telescopic direction, the second locking member has a second locking tooth and is movably connected to the fixing member, the second elastic member is arranged between the fixing member and the locking member, and the second elastic member is configured to push the second locking member so that the second locking tooth is engaged in the stepped groove; The telescopic member can be controlled to extend and retract by pushing and pulling the control member, and the second locking teeth can be sequentially inserted into different stepped grooves.

6. The back support device according to claim 5, characterized in that The stepped groove is a one-way groove, and the fixing member is provided with a second installation groove and a second give way groove that are interconnected. The second locking member is arranged in the second installation groove. Pulling the control member out can drive the second locking member so that the end of the second locking member is stuck in the second give way groove. When the end of the locking member is stuck in the second give way groove, the second lock tooth remains separated from the stepped groove.

7. The back support device according to claim 6, wherein: The telescopic member is provided with a second guide surface and a second blocking surface, the second guide surface is connected to the inclined wall of the stepped groove at the lower end, and the second blocking surface is connected to the inclined wall of the stepped groove at the upper end. When the telescopic member is extended by the control member, the second locking tooth slides over the second guide surface, and the second guide surface can guide the second locking tooth so that the end of the second locking member is aligned with and stuck in the second yield groove; when the telescopic member is pushed to retract by the control member, the second blocking surface abuts against the end of the second locking member, and the second blocking surface can push the second locking member so that the end of the second locking member is disengaged from the second yield groove, and the second locking tooth is stuck in the stepped groove.

8. The back support device according to claim 6, wherein: A reset member is provided between the fixing member and the telescopic member. When the end of the second locking member is inserted into the second displacement groove, the reset member can pull the telescopic member to contract and reset.

9. The back support device according to claim 8, wherein: The fixing member is provided with a receiving groove, and the resetting member is arranged in the receiving groove.

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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