Back supporting device and seat

Abstract

The back supporting device comprises a back support and a back frame assembly, the back support is provided with a connecting plate, a plurality of gear grooves are formed in the middle of the front side of the connecting plate, separation blocks are arranged at the upper ends of the gear grooves, and reset blocks are arranged at the lower ends of the gear grooves. The back frame assembly comprises a sliding seat, a clamping piece, an elastic piece and a back supporting structure, the sliding seat is connected to the connecting plate and can slide up and down, the back supporting structure is connected to the front side of the sliding seat, the rear side of the sliding seat is provided with a containing groove, a clamping groove and a separating groove which are communicated with one another, the separating groove is located on one side of the clamping groove, and the clamping piece comprises clamping teeth and a clamping column; the clamping piece is arranged in the containing groove, the clamping teeth extend towards the gear groove, the clamping column is clamped in the clamping groove, the elastic piece is arranged in the containing groove, and the elastic piece is configured to be capable of pushing the clamping piece so that the clamping teeth can be clamped into the gear groove; according to the back supporting device provided by the embodiment of the utility model, the function of adjusting the back supporting height is realized, and the user experience is 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 frame, armrests and a lumbar support. The back frame can provide support for the human back and can greatly improve comfort. However, in related technologies, the back frames of some seats are fixed and their height cannot be adjusted, so they cannot support the user's back frame well, affecting 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 realizes the function of adjusting the back support height, significantly improving 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 at the upper end, a plurality of gear slots being provided in the middle of the front side of the connecting plate, the plurality of gear slots opening upward and spaced apart from top to bottom, the connecting plate being provided with a separation block and a reset block, the separation block being provided at the upper ends of the plurality of gear slots, and the reset block being provided at the lower ends of the plurality of gear slots;

[0007] The back frame assembly includes a slide, a clamping member, an elastic member and a back support structure, wherein the slide is connected to the connecting plate and can slide up and down, the back support structure is connected to the front side of the slide, the rear side of the slide is provided with a receiving groove, a clamping groove and a separation groove that are interconnected, the separation groove is located on one side of the clamping groove, the clamping member includes a clamping tooth and a clamping column, the clamping member is arranged in the receiving groove and the clamping tooth extends toward the gear groove, the clamping column is clamped in the clamping groove, the elastic member is arranged in the receiving groove, and the elastic member is configured to push the clamping member so that the clamping tooth is clamped into the gear groove;

[0008] Among them, pushing the back support structure can drive the back frame assembly to rise or fall, and when the latch tooth slides over the gear slot at the upper end, the latch tooth abuts against the separation block, and the separation block can push the latch tooth to make the clamping column clamped into the separation slot, and the latch tooth remains separated from the gear slot; when the latch tooth slides over the gear slot at the lower end, the latch tooth abuts against the reset block, and the reset block can push the latch tooth to make the clamping column clamped into the clamping slot, and the elastic member can push the clamping member to make the latch tooth clamped into 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: a plurality of gear slots are provided on the connecting plate of the back bracket, and the plurality of gear slots provide support points of different heights for the back frame assembly, so that the user can adjust the height of the back support according to his or her needs. At the same time, the coordinated work of the slide seat, the clamping member, the elastic member and the back support structure in the back frame assembly ensures a smooth and stable adjustment process. During the adjustment process, the latching teeth of the clamping member can be engaged with different gear slots to fix the back frame assembly; and when adjustment is required, by pushing the back support structure, the latching teeth can be smoothly disengaged from the gear slots under the action of the separation block or the reset block, and engaged with the gear slots again, thereby achieving the raising or lowering of the back frame assembly. This not only improves the comfort and practicality of the chair, but also enhances the adaptability and flexibility of the chair, meeting the personalized needs of different users for the back support height.

[0010] According to the back support device provided by the embodiment of the first aspect of the present invention, the back support structure includes a connecting frame and a back frame, the connecting frame is connected to the front side of the slide, and the back frame is fixed to the front side of the connecting frame by fasteners.

[0011] According to the back support device provided by the embodiment of the first aspect of the present invention, the back support structure also includes a buffer spring, the connecting frame is connected to the slide and can slide up and down, one end of the buffer spring is connected to the slide, and the other end is connected to the rear side of the connecting frame.

[0012] According to the back support device provided by the embodiment of the first aspect of the present invention, a guide bar is provided on the front side of the slide seat, and the connecting frame is provided with a guide groove running through the front and back. The guide bar is clamped in the guide groove and extends to the front side of the connecting frame. The front end of the guide bar is connected to a limiting piece to limit the connecting frame to the slide seat.

[0013] According to the back support device provided by the embodiment of the first aspect of the present invention, two guide bars are provided on the front side of the slide seat, and the connecting frame is provided with two guide grooves, and each guide bar is inserted into one guide groove.

[0014] According to the back support device provided by the embodiment of the first aspect of the present invention, the back frame assembly further includes a locking structure, which is configured to lock the connecting frame to the sliding seat, thereby limiting the upward and downward movement of the locking structure.

[0015] According to the back support device provided by the embodiment of the first aspect of the present invention, the locking structure includes a driving member and a locking member, a locking groove is provided on one side of the limiting member, and the locking member is provided on one side of the locking groove. The driving member is connected to the back frame and connected to the locking member, and the driving member is configured to drive the locking member to move so that the locking member is stuck in the locking groove, or the locking member is separated from the locking groove.

[0016] According to the back support device provided by the embodiment of the first aspect of the present invention, a rotating column is provided on the front side of the back frame, the driving member is rotatably connected to the rotating column, the front side of the connecting frame is provided with a mounting groove extending toward the limiting member, the locking member is provided in the mounting groove and can slide, the driving member is connected to the locking member, and rotating the driving member can drive the locking member to slide.

[0017] According to the back support device provided by the embodiment of the first aspect of the present invention, two locking grooves are provided on one side of the limiting member, the two locking members are arranged at intervals from top to bottom, and the locking member is snapped into one of the locking grooves.

[0018] The seat provided in accordance with the embodiment of the second aspect of the present invention has all the beneficial effects of the embodiment of the first aspect of the present invention.

[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 structural diagram of a back support and back frame assembly according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic structural diagram of a back support and a connecting frame according to an embodiment of the present utility model;

[0024] Figure 4 An exploded schematic diagram of a back support device provided by an embodiment of the present utility model;

[0025] Figure 5 This is an exploded schematic diagram of another angle of the back support device provided by an embodiment of the present invention;

[0026] Figure 6A schematic structural diagram of a slide seat and a buffer spring provided in an embodiment of the present utility model;

[0027] Figure 7 This is an exploded schematic diagram of the slide and the clamping member provided in an embodiment of the present utility model.

[0028] The accompanying figures are as follows:

[0029] Back support 1000; connecting plate 1100; gear slot 1110; separation block 1120; reset block 1130;

[0030] Back frame assembly 2000; slide 2100; accommodating groove 2110; snap-fitting groove 2120; separation groove 2130; guide bar 2140; limiting cover 2150; snap-fitting member 2200; latching tooth 2210; snap-fitting column 2220; elastic member 2300; back support structure 2400; connecting frame 2410; guide groove 2411; back frame 2420; rotating column 2421; buffer spring 2430; limiting member 2440; locking groove 2441; locking structure 2500; driving member 2510; locking member 2520; lumbar support 2600. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Reference Figures 1 to 7 According to an embodiment of the first aspect of the present invention, a back support device includes a back support 1000 and a back frame 2420 assembly 2000. The back support 1000 is made of a hard material and has sufficient strength and stability. A connecting plate 1100 is disposed at the upper end of the back support 1000 and can be integrally formed with the back support 1000. A plurality of shift slots 1110 are provided in the middle portion of the front side of the connecting plate 1100. The shift slots 1110 open upward and are evenly spaced from top to bottom. The connecting plate 1100 also includes a separation block 1120 and a reset block 1130. The separation block 1120 is located at the upper end of the shift slots 1110, and the reset block 1130 is located at the lower end of the shift slots 1110. The back frame 2420 assembly 2000 includes a slide 2100, a clamping member 2200, an elastic member 2300, and a back support structure 2400. The slide 2100 is connected to the connecting plate 1100 via a slide rail and can slide up and down. The back support structure 2400 adopts an ergonomically designed curved shape and is connected to the front side of the slide 2100, providing comfortable back support for the user. The rear side of the slide 2100 is provided with a receiving groove 2110, a clamping groove 2120 and a separation groove 2130 that are interconnected, wherein the separation groove 2130 is located on one side of the clamping groove 2120. The clamping member 2200 is made of plastic material and includes a clamping tooth 2210 and a clamping column 2220. The clamping member 2200 is arranged in the receiving groove 2110, the clamping tooth 2210 extends toward the gear slot 1110, and the clamping column 2220 is used to clamp into the clamping groove 2120 or the separation groove 2130. The elastic member 2300 is a spring and is disposed in the accommodating groove 2110 . One end of the elastic member 2300 abuts against the bottom wall of the accommodating groove 2110 , and the other end abuts against the clamping member 2200 , and is used to push the clamping member 2200 to make the clamping tooth 2210 engage with the gear groove 1110 .

[0037] During use, the user can raise or lower the back frame 2420 assembly 2000 by pushing the back support structure 2400. When the back support structure 2400 is pushed upward, the latch 2210 slides sequentially through the multiple shift slots 1110 until it reaches the topmost shift slot 1110. At this point, the latch 2210 abuts the separation block 1120, which pushes the latch 2210, causing the latch post 2220 on one side of the latch 2200 to engage the separation slot 2130. The latch 2210 remains separated from the shift slot 1110, allowing the user to lower the back frame 2420 assembly 2000. Similarly, when the back support structure 2400 is pushed downward, the latch 2210 remains separated from the shift slot 1110 and slides through the bottommost shift slot 1110. At this time, the latching teeth 2210 abut against the reset block 1130, which pushes the latching teeth 2210 to engage the engaging posts 2220 into the engaging grooves 2120. Under the action of the elastic member 2300, the engaging member 2200 is pushed, causing the latching teeth 2210 to engage with the corresponding shifting grooves 1110, thereby securing the back frame 2420 assembly 2000.

[0038] It can be understood from the figure that the limiting cover 2150 is connected to the slide 2100 so as to confine the clamping member 2200 and the elastic member 2300 in the accommodating groove 2110.

[0039] According to the back support device provided by the first embodiment of the present invention, the connecting plate 1100 on the back bracket 1000 is provided with multiple gear slots 1110. These multiple gear slots 1110 provide support points at different heights for the back frame 2420 assembly 2000, allowing the user to adjust the height of the back support according to their needs. Furthermore, the coordinated operation of the slide 2100, the clamping member 2200, the elastic member 2300, and the back support structure 2400 in the back frame 2420 assembly 2000 ensures a smooth and stable adjustment process. During adjustment, the latching teeth 2210 of the connecting member 2200 can engage with different shift slots 1110, securing the back frame 2420 assembly 2000. When adjustment is needed, by pushing the back support structure 2400, the latching teeth 2210 can smoothly disengage the shift slots 1110 under the action of the separation block 1120 or the return block 1130 and reengage the shift slots 1110, thereby raising or lowering the back frame 2420 assembly 2000. This not only improves the comfort and practicality of the chair, but also enhances its adaptability and flexibility, meeting the personalized needs of different users for back support height.

[0040] Reference Figures 1 to 5According to the back support device provided by the first embodiment of the present invention, the back support structure 2400 includes a connecting frame 2410 and a back frame 2420. The connecting frame 2410 serves as a bridge between the back support structure 2400 and the slide 2100, and has excellent structural strength and stability. The rear side of the connecting frame 2410 is tightly connected to the front side of the slide 2100 via bolts or other reliable means to ensure that it will not loosen or fall off during use.

[0041] The back frame 2420 is the part that directly contacts the user's back, and the choice of its shape and material are directly related to the user's comfort. In this embodiment, the back frame 2420 adopts an ergonomically designed curved shape to better fit the user's back contour. The front side of the back frame 2420 can be provided with soft fabric, sponge or memory foam to improve the comfort of use. In addition, the back frame 2420 is also fixed to the front side of the connecting frame 2410 by fasteners such as bolts, nuts or clips. This fixing method not only ensures a firm connection between the back frame 2420 and the connecting frame 2410, but also facilitates the disassembly and replacement of the back frame 2420 when needed to meet the needs of different users or different usage scenarios.

[0042] Reference Figure 4 and Figure 6 According to the back support device provided by the embodiment of the first aspect of the present utility model, the back support structure 2400 also includes a buffer spring 2430, and the connecting frame 2410 is not only connected to the front side of the slide 2100, but also has a structure that can slide up and down relative to the slide 2100. The sliding connection between the connecting frame 2410 and the slide 2100 can be achieved by providing a slide rail, a slide groove and other structures between the connecting frame 2410 and the slide 2100, thereby ensuring the stability and smoothness of the connecting frame 2410 during the sliding process. The buffer spring 2430 is provided between the slide 2100 and the connecting frame 2410. The upper end of the buffer spring 2430 is connected to the slide 2100 by means of a hook or a fastener, and similarly, the lower end of the buffer spring 2430 is also connected to the rear side of the connecting frame 2410 by means of a hook or a fastener. When the user uses the chair and leans on the back support structure 2400, the connecting frame 2410 and the back frame 2420 can move up and down relative to the slide 2100, so that the buffer spring 2430 can absorb and disperse the pressure from the user's back, playing a role in shock absorption and pressure relief, thereby greatly improving the comfort of use.

[0043] Furthermore, the introduction of buffer springs 2430 also imparts a degree of adaptability to the back support structure. As the user adjusts the height of the back support, buffer springs 2430 expand and contract based on the user's movements and strength, ensuring that the back support structure 2400 smoothly moves to the desired position and provides appropriate support when the user leans back.

[0044] Reference Figures 4 to 7 According to the back support device provided by the first embodiment of the present invention, a guide bar 2140 is provided on the front side of the slide 2100, and a guide slot 2411 is provided on the connecting frame 2410, extending from front to back. The guide bar 2140 is fixed to the guide slot 2411 and extends to the front side of the connecting frame 2410. The front end of the guide bar 2140 is connected to a limiter 2440 to restrain the connecting frame 2410 to the slide 2100. The guide bar 2140 is provided on the front side of the slide 2100. The guide bar 2140 can be made of plastic, which has a certain degree of rigidity and wear resistance. The guide bar 2140 can be fixed to the slide 2100 by fasteners, or it can be integrally formed with the slide 2100. The shape of the guide bar 2140 matches the guide slot 2411 provided on the connecting frame 2410, ensuring a tight fit therein. The guide slot 2411 is designed to extend from front to back, allowing the guide bar 2140 to pass through it and extend to the front side of the connecting frame 2410. A stopper 2440 is connected to the front end of the guide bar 2140. The stopper 2440 is a rectangular block. When the guide bar 2140 is fully inserted into the guide slot 2411, the stopper 2440 is connected to the front end of the guide bar 2140 via fasteners and abuts the front side of the connecting frame 2410, effectively confining the connecting frame 2410 to the slide 2100 and preventing it from detaching from the slide 2100 or shaking unnecessarily during sliding.

[0045] As can be appreciated, the coordinated design of guide bar 2140 and guide slot 2411 not only improves the sliding stability of connecting frame 2410 on slide 2100, but also ensures accuracy and reliability when adjusting the height of back support structure 2400. During use, users can more smoothly adjust the height of the back support without worrying about connecting frame 2410 loosening or falling off, thereby enhancing the safety and durability of the entire back support device.

[0046] Reference Figures 1 to 7According to the back support device provided by the embodiment of the first aspect of the present invention, two guide bars 2140 are provided on the front side of the slide 2100. The two guide bars 2140 are located on either side of the front side of the slide 2100, are parallel to each other, and are spaced a certain distance apart. The design of the guide bars 2140 still maintains its rigidity and wear resistance, ensuring that it can be stably inserted into the guide slots 2411 on the connecting frame 2410. Similarly, the two guide slots 2411 on the connecting frame 2410 are also located at positions corresponding to the guide bars 2140, and their shapes and sizes match those of the guide bars 2140, so that each guide bar 2140 can be accurately inserted into a guide slot 2411. The design of the dual guide bars 2140 and dual guide slots 2411 not only further enhances the sliding stability of the connecting frame 2410 on the slide 2100, but also effectively prevents the connecting frame 2410 from deflecting or shaking during sliding. Even if a large external force or vibration is encountered during use, the dual-guide structure can ensure that the connecting frame 2410 always remains in the correct position, thereby improving the impact resistance and durability of the entire back support device.

[0047] Furthermore, the dual-guide design allows for smoother and more stable height adjustment of the back support structure 2400. Users can more easily push the back support structure 2400 without worrying about the connecting frame 2410 deviating from the track or getting stuck, thus achieving a more convenient and comfortable seat height adjustment function.

[0048] Reference Figures 2 to 5 According to the back support device provided by the first embodiment of the present invention, the back frame 2420 assembly 2000 further includes a locking structure 2500. The locking structure 2500 is configured to lock the connecting frame 2410 to the sliding seat 2100, thereby limiting the vertical movement of the locking structure 2500. During daily use, the user can control the locking structure 2500 as needed to adjust the state of the back frame 2420. The back frame 2420 has an unlocked state and a locked state. When the locking structure 2500 is in the unlocked state, the connecting frame 2410 and the back frame 2420 can move up and down relative to the sliding seat 2100, allowing the buffer spring 2430 to absorb and distribute pressure from the user's back, providing shock absorption and pressure relief. When the locking structure 2500 is in the locked state, the connecting frame 2410 and the back frame 2420 are fixed to the sliding seat 2100, thereby providing stable support for the user's back.

[0049] Reference Figures 2 to 5According to the back support device provided by the embodiment of the first aspect of the present invention, the locking structure 2500 includes a driving member 2510 and a locking member 2520. A locking groove 2441 is provided on one side of the limiting member 2440. The locking groove 2441 is designed for the insertion of the locking member 2520 and is used to engage with the locking member 2520, thereby preventing the connecting frame 2410 from moving on the slide 2100. The locking member 2520 is provided on one side of the locking groove 2441 and can be a resilient claw, latch, or other structure that can engage with the locking groove 2441 and maintain stability. The driving member 2510 is connected to the back frame 2420 and is tightly connected to the locking member 2520. The design of the driving member 2510 takes into account the convenience and comfort of user operation. The driving member 2510 can be a handle, button, or knob. The user only needs to push, press, or turn it gently to drive the locking member 2520 to move. When the user needs to lock the connecting frame 2410, by operating the driving member 2510, the locking member 2520 can be moved and snapped into the locking groove 2441, thereby achieving stable fixation of the connecting frame 2410 on the slide 2100. Conversely, when the user needs to unlock the connecting frame 2410, simply reverse the driving member 2510 to separate the locking member 2520 from the locking groove 2441, and the connecting frame 2410 can now slide freely on the slide 2100. The design of this locking structure 2500 not only improves the stability and safety of the back support device, but also allows the user to more easily and conveniently adjust and fix the height of the back support during use. The user can lock and unlock the device through simple operations without the need for additional tools or complicated steps, thereby greatly improving the convenience of use and user experience.

[0050] Reference Figures 2 to 5 According to the back support device provided by the first embodiment of the present invention, a rotating column 2421 is provided on the front side of the back frame 2420. The rotating column 2421 serves as the rotation axis of the driver 2510, enabling the driver 2510 to rotate around it. The driver 2510 can be a handle, knob, or other user-friendly component. The driver 2510 is rotatably connected to the rotating column 2421, allowing the user to apply force by rotating the driver 2510. A mounting slot extending toward the stopper 2440 is provided on the front side of the connecting frame 2410. The mounting slot provides a space for the locking member 2520 and is shaped and sized to match the locking member 2520, ensuring stable sliding movement within the slot. The locking member 2520 is positioned within the mounting slot and connected to the driver 2510. This connection allows the user to slide the locking member 2520 within the mounting slot when the driver 2510 is rotated, thereby achieving locking and unlocking functions.

[0051] When the user needs to lock the connecting frame 2410, they simply rotate the driving member 2510. Through the connection between the driving member 2510 and the locking member 2520, the locking member 2520 is driven and slides toward the locking slot 2441 of the retaining member 2440 until it engages in the locking slot 2441, securing the connecting frame 2410. Conversely, when the user needs to unlock the connecting frame 2410, they rotate the driving member 2510 in the opposite direction. This causes the locking member 2520 to slide out of the locking slot 2441, allowing the connecting frame 2410 to slide freely on the slide 2100. This not only makes the locking structure 2500 more compact and stable, but also greatly improves user convenience. Users can lock and unlock with a simple rotation, without requiring additional force or complicated steps. Furthermore, the design of the mounting slot ensures the stability and accuracy of the locking member 2520 during the sliding process, preventing locking failure or unlocking difficulties caused by the locking member 2520 shifting or shaking.

[0052] Reference Figure 4 According to the back support device provided by the embodiment of the first aspect of the present invention, two locking slots 2441 are now provided on one side of the limiting member 2440. The two locking slots 2441 are spaced apart from each other from top to bottom, providing two different snap-in positions for the locking member 2520. The provision of two locking slots 2441 provides more adjustment options and greater stability for the back frame 2420. The user can adjust the height of the back support by snapping the locking member 2520 into the upper or lower locking slot 2441 according to their needs or preferences.

[0053] Reference Figure 1 It can be understood that the back support device also includes a lumbar support 2600. A connecting arm is provided at the lower end of the connecting frame 2410. The rear side of the lumbar support 2600 is connected to the back frame 2420, and the lower end is connected to the connecting arm, so that the lumbar support 2600 can be fixed, so that the lumbar support 2600 can stably support the user's waist.

[0054] The seat provided in accordance with the embodiment of the second aspect of the present invention has all the beneficial effects of the embodiment of the first aspect of the present invention.

[0055] 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 at the upper end, a plurality of gear slots being provided in the middle of the front side of the connecting plate, the plurality of gear slots opening upward and spaced apart from top to bottom, the connecting plate being provided with a separation block and a reset block, the separation block being provided at the upper ends of the plurality of gear slots, and the reset block being provided at the lower ends of the plurality of gear slots; The back frame assembly includes a slide, a clamping member, an elastic member and a back support structure, wherein the slide is connected to the connecting plate and can slide up and down, the back support structure is connected to the front side of the slide, the rear side of the slide is provided with a receiving groove, a clamping groove and a separation groove that are interconnected, the separation groove is located on one side of the clamping groove, the clamping member includes a clamping tooth and a clamping column, the clamping member is arranged in the receiving groove and the clamping tooth extends toward the gear slot, the clamping column is clamped in the clamping groove, the elastic member is arranged in the receiving groove, and the elastic member is configured to push the clamping member so that the clamping tooth is clamped into the gear slot; Among them, pushing the back support structure can drive the back frame assembly to rise or fall, and when the latch tooth slides over the gear slot at the upper end, the latch tooth abuts against the separation block, and the separation block can push the latch tooth to make the clamping column clamped into the separation slot, and the latch tooth remains separated from the gear slot; when the latch tooth slides over the gear slot at the lower end, the latch tooth abuts against the reset block, and the reset block can push the latch tooth to make the clamping column clamped into the clamping slot, and the elastic member can push the clamping member to make the latch tooth clamped into the gear slot.

2. The back support device according to claim 1, wherein: The back support structure includes a connecting frame and a back frame. The connecting frame is connected to the front side of the slide seat, and the back frame is fixed to the front side of the connecting frame through fasteners.

3. The back support device according to claim 2, wherein: The back support structure further includes a buffer spring. The connecting frame is connected to the slide seat and can slide up and down. One end of the buffer spring is connected to the slide seat, and the other end is connected to the rear side of the connecting frame.

4. The back support device according to claim 3, wherein: A guide bar is provided on the front side of the slide, and a guide groove is provided on the connecting frame that passes through the front and back. The guide bar is clamped in the guide groove and extends to the front side of the connecting frame. The front end of the guide bar is connected to a limiting piece to limit the connecting frame to the slide.

5. The back support device according to claim 4, characterized in that Two guide bars are provided on the front side of the slide, and two guide grooves are provided on the connecting frame. Each guide bar is inserted into one guide groove.

6. The back support device according to claim 4, wherein: The back frame assembly further includes a locking structure, which is configured to lock the connecting frame to the sliding seat, thereby limiting the movement of the locking structure in the up and down directions.

7. The back support device according to claim 6, wherein: The locking structure includes a driving member and a locking member. A locking groove is provided on one side of the limiting member. The locking member is provided on one side of the locking groove. The driving member is connected to the back frame and to the locking member. The driving member is configured to drive the locking member to move so that the locking member is engaged in the locking groove, or the locking member is separated from the locking groove.

8. The back support device according to claim 7, wherein: A rotating column is provided on the front side of the back frame, and the driving member is rotatably connected to the rotating column. A mounting groove extending toward the limiting member is provided on the front side of the connecting frame. The locking member is provided in the mounting groove and can slide. The driving member is connected to the locking member, and rotating the driving member can drive the locking member to slide.

9. The back support device according to claim 7, wherein: Two locking grooves are provided on one side of the limiting member. The two locking members are spaced apart from each other from top to bottom, and the locking member is locked in one of the locking grooves.

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

Images