A back support device and a seat

Abstract

The utility model relates to a sitting furniture technical field discloses a back support device and seat, can realize the greater range of back support height adjustable. The utility model discloses back support, sliding seat, back frame subassembly, first adjustable limiting mechanism and second adjustable limiting mechanism, and the front side of sliding seat is connected in back support and can slide up and down, and the front side of back frame subassembly is connected in sliding seat and can slide up and down, and first adjustable limiting mechanism is used for limiting the sliding seat relative to back support sliding, and second adjustable limiting mechanism is used for limiting back frame subassembly relative to sliding seat sliding. The utility model cooperates the up and down sliding between back support and sliding seat, the up and down sliding between back frame subassembly and sliding seat, first adjustable limiting mechanism and second adjustable limiting mechanism, realize two section regulation's mode, like this can effectively increase the stroke of back frame subassembly relative to back support sliding, can adapt to the demand of more different height people to improve the adaptability range.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a back support device and a seat. Background Technology

[0002] The structure of a seat includes a seat cushion, back frame, armrests, and lumbar support. The back frame provides support for the back and can improve comfort. However, in some related technologies, the back frame of some seats is fixed and its height cannot be adjusted, which cannot properly support the user's back and affects the user experience. While some back frames are height-adjustable, they can only accommodate people of certain heights. Some petite people need the back frame to be adjusted lower, or some taller people need it to be adjusted higher, but the existing seat adjustments cannot meet these needs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a back support device that allows for a wider range of adjustable back support height to accommodate more people and significantly improve the user experience.

[0004] This utility model also proposes a seat with the above-mentioned back support device.

[0005] On one hand, the back support device according to an embodiment of the present invention includes: Back support; A slide block, which is connected to the front side of the back support and can slide up and down; A back frame assembly, which is connected to the front side of the slide and is capable of sliding up and down; A first adjustable limiting mechanism is provided between the back support and the slide block to limit the sliding of the slide block relative to the back support; A second adjustable limiting mechanism is provided between the slide and the back frame assembly to limit the sliding of the back frame assembly relative to the slide.

[0006] According to some embodiments of the present invention, the first adjustable limiting mechanism includes: Multiple gear slots are provided in the middle of the connecting plate of the back bracket, and the multiple gear slots are arranged with their openings facing upwards and spaced apart from top to bottom; A snap-fit ​​connector is movably disposed among the plurality of said gear slots; When the snap-fit ​​component is snapped into any of the gear slots, the snap-fit ​​component and the corresponding gear slot cooperate to restrict the sliding of the slide block relative to the back support.

[0007] According to some embodiments of the present invention, the first adjustable limiting mechanism further includes: A separation block is disposed at the upper end of the plurality of gear slots; A reset block is located at the lower end of the plurality of gear slots; A receiving groove is provided on the rear side of the slide block; A snap-fit ​​groove is provided on the rear side of the slide and communicates with the receiving groove; A separation groove is provided on the rear side of the slide and communicates with the receiving groove and the snap-fit ​​groove respectively. The separation groove is located on one side of the snap-fit ​​groove. An elastic element is disposed within the receiving groove; The latching member includes latching teeth and latching posts. The latching member is disposed in the receiving groove and the latching teeth extend toward the gear position groove and are disposed between the gear position groove and the slide block. The latching member is disposed in the receiving groove and the latching teeth extend toward the gear position groove. The latching posts are latched into the latching groove. The elastic element is configured to push the snap-fit ​​element to engage the snap-fit ​​teeth into the gear slot; When the back frame assembly is pushed up or down, when the locking tooth slides past the uppermost gear slot, the locking tooth abuts against the separating block. The separating block can push the locking tooth to make the locking pin engage in the separating slot, and the locking tooth remains separated from the gear slot. When the locking tooth slides past the lowermost gear slot, the locking tooth abuts against the reset block. The reset block can push the locking tooth to make the locking pin engage in the locking slot. The elastic member can push the locking member to make the locking tooth engage in the gear slot.

[0008] According to some embodiments of the present invention, the second adjustable limiting mechanism includes a spring, one end of which is connected to the slide block and the other end is connected to the rear side of the back frame assembly. When the back frame assembly slides relative to the slide block, the spring deforms, and the spring force is used to drive the back frame assembly to reset.

[0009] According to some embodiments of the present invention, the second adjustable limiting mechanism further includes: A guide groove running through the front and back is provided on the back frame assembly; A guide bar is provided on the front side of the slide block, the guide bar is engaged in the guide groove and extends to the front side of the back frame assembly; A limiting member, connected to the front end of the guide strip, is used to limit the back frame assembly to the slide.

[0010] According to some embodiments of the present invention, the second adjustable limiting mechanism further includes a locking structure, which is configured to lock the back frame assembly to the slide, thereby restricting the movement of the back frame assembly in the vertical direction.

[0011] According to some embodiments of the present invention, a locking groove is provided on one side of the limiting member, and the locking structure includes: A locking element, wherein the locking element is disposed on one side of the locking groove; A drive member connected to the back frame assembly and to the locking member, the drive member being configured to move the locking member to engage the locking member in the locking slot, or to disengage the locking member from the locking slot.

[0012] According to some embodiments of the present invention, a rotating column is provided on the front side of the back frame assembly, the driving member is rotatably connected to the rotating column, the front side of the back frame assembly is provided with a mounting groove extending toward the limiting member, the locking member is disposed 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.

[0013] According to some embodiments of the present invention, the front side of the slide is provided with two guide strips, the back frame assembly is provided with two guide grooves, and each guide strip is inserted into one guide groove; The limiting member has two locking slots on one side, and the two locking members are arranged at intervals from top to bottom, with the locking member engaging one of the locking slots.

[0014] On the other hand, the seat according to the present invention includes the back support device according to the above embodiment of the present invention.

[0015] The present invention has at least the following beneficial effects: by combining the up-and-down sliding between the back support and the slide, the up-and-down sliding between the back frame assembly and the slide, and the first adjustable limiting mechanism and the second adjustable limiting mechanism, a two-stage adjustment method is achieved. This can effectively increase the travel of the back frame assembly relative to the back support, thereby adapting to the needs of more people of different heights and improving the range of adaptability.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 is an overall schematic diagram of the back support device provided in an embodiment of this utility model; Figure 2 is a structural schematic diagram of the back support and back frame assembly according to an embodiment of the present invention; Figure 3 is a structural schematic diagram of the back support and connecting frame of this utility model embodiment; Figure 4 is an exploded view of the back support device provided in an embodiment of the present invention; Figure 5 is an exploded view of the back support device provided in an embodiment of the present invention from another angle; Figure 6 is a schematic diagram of the slide and spring provided in an embodiment of this utility model; Figure 7 is an exploded view of the slide and the snap-fit ​​component provided in the embodiment of this utility model; Figure 8 This is a schematic diagram of the structure of the slide, the locking member, and the limiting member provided in the embodiment of this utility model; Figure 9 This is a schematic diagram of the connecting plate provided in an embodiment of the present utility model.

[0018] Figure label: Detailed Implementation

[0019] The following will provide a clear and complete description of the concept, specific structure, and technical effects of this utility model in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0020] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," "right," "top," and "bottom" used in this utility model are only relative to the relative positional relationships of the various components of this utility model in the accompanying drawings.

[0021] It should be noted that, unless otherwise specified, when one feature is referred to as having an "electrical connection" with another feature, the two features can be connected directly via pins, via cables, or via wireless transmission. Specific electrical connection methods are common to those skilled in the art, and they can implement the connection as needed.

[0022] Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and not for limiting the scope of the invention. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0023] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from one another. For example, without departing from the scope of this disclosure, a first element may also be referred to as a second element, and similarly, a second element may also be referred to as a first element.

[0024] Reference Figures 1 to 9 According to the first aspect of the present invention, a back support device includes a back support 1000 and a back frame assembly 2000. The back support 1000 is made of a rigid 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. The front center of the connecting plate 1100 is provided with a plurality of stop grooves 1110, which are arranged at equal intervals from top to bottom with their openings facing upwards. The connecting plate 1100 is also provided with a separating block 1120 and a resetting block 1130. The separating block 1120 is located at the upper end of the stop groove 1110, and the resetting block 1130 is located at the lower end of the stop groove 1110. The back frame assembly 2000 includes a slide 2100, a snap-fit ​​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 of the slide 2100, providing comfortable back support for the user. The rear of the slide 2100 has interconnected receiving groove 2110, snap-fit ​​groove 2120, and separation groove 2130, with the separation groove 2130 located on one side of the snap-fit ​​groove 2120. The snap-fit ​​component 2200 is made of plastic and includes snap teeth 2210 and snap-fit ​​posts 2220. The snap-fit ​​component 2200 is located within the receiving groove 2110, with the snap teeth 2210 extending towards the stop groove 1110, and the snap-fit ​​posts 2220 used to snap into the snap-fit ​​groove 2120 or the separation groove 2130. The elastic element 2300 is a spring, which is located in the receiving groove 2110. One end of the spring abuts against the bottom wall of the receiving groove 2110, and the other end abuts against the snap-fit ​​element 2200. It is used to push the snap-fit ​​element 2200 so that the snap-fit ​​teeth 2210 are snapped into the gear slot 1110.

[0025] In use, the user can raise or lower the back frame assembly 2000 by pushing the back support structure 2400. When the back support structure 2400 is pushed up, the locking teeth 2210 slide through multiple stop slots 1110 in sequence until the uppermost stop slot 1110. At this time, the locking teeth 2210 abut against the separating block 1120. The separating block 1120 pushes the locking teeth 2210 so that the locking post 2220 on one side of the locking member 2200 engages with the separating groove 2130. The locking teeth 2210 remain separated from the stop slots 1110, and the user can then push the back frame assembly 2000 down. Similarly, when the back support structure 2400 is pushed down, the locking teeth 2210 remain separated from the stop slots 1110 and slide through the lowermost stop slot 1110. At this time, the locking tooth 2210 will abut against the reset block 1130, and the reset block 1130 will push the locking tooth 2210 to make the locking post 2220 engage with the locking groove 2120. Under the action of the elastic member 2300, the locking member 2200 is pushed, making the locking tooth 2210 engage with the corresponding stop groove 1110, thereby fixing the back frame assembly 2000.

[0026] As can be understood from the diagram, the slide 2100 is connected to a limiting cover 2150, which enables the snap-fit ​​member 2200 and the elastic member 2300 to be confined within the receiving groove 2110.

[0027] According to the back support device provided in the first aspect embodiment of this utility model, the connecting plate 1100 on the back bracket 1000 is provided with multiple stop slots 1110. These multiple stop slots 1110 provide support points of different heights for the back frame assembly 2000, allowing the user to adjust the height of the back support according to their needs. Simultaneously, the coordinated operation of the slide 2100, snap-fit ​​member 2200, elastic member 2300, and back support structure 2400 in the back frame assembly 2000 ensures smooth and stable adjustment. During adjustment, the snap-fit ​​teeth 2210 of the snap-fit ​​member 2200 can engage with different stop slots 1110 to fix the back frame assembly 2000. When adjustment is required, by pushing the back support structure 2400, the snap-fit ​​teeth 2210 can smoothly disengage from the stop slots 1110 under the action of the separating block 1120 or the reset block 1130, and then re-engage with the stop slots 1110, thereby realizing the raising or lowering of the back frame assembly 2000. This not only improves the comfort and practicality of the seat, but also enhances its adaptability and flexibility, meeting the personalized needs of different users for back support height.

[0028] Reference Figures 1 to 5According to the back support device provided in the first aspect embodiment of this utility model, the back support structure 2400 includes a connecting frame 2410 and a back frame 2420. The connecting frame 2410 serves as a connecting bridge between the back support structure 2400 and the slide 2100, and has good structural strength and stability. The rear side of the connecting frame 2410 is reliably connected to the front side of the slide 2100 by bolts or other reliable means to ensure that it will not loosen or fall off during use.

[0029] The back frame 2420 is the part that directly contacts the user's back, and its shape and material selection directly affect 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 made of soft fabric, sponge, or memory foam to improve comfort. In addition, the back frame 2420 is fixed to the front side of the connecting frame 2410 by fasteners such as bolts, nuts, or clips. This fixing method ensures a firm connection between the back frame 2420 and the connecting frame 2410, and also facilitates the disassembly and replacement of the back frame 2420 when needed to meet the needs of different users or different usage scenarios.

[0030] Reference Figure 4 and Figure 6 According to the back support device provided in the first aspect embodiment of this utility model, the back support structure 2400 further includes a spring 2430, and the connecting frame 2410 is not only connected to the front side of the slide block 2100, but also has a structure that can slide up and down relative to the slide block 2100. The sliding connection between the connecting frame 2410 and the slide block 2100 can be achieved by setting a slide rail, slide groove or other structure between the connecting frame 2410 and the slide block 2100, ensuring the stability and smoothness of the connecting frame 2410 during the sliding process. The spring 2430 is disposed between the slide block 2100 and the connecting frame 2410. The upper end of the spring 2430 is connected to the slide block 2100 by means of hooks or fasteners, and similarly, the lower end of the spring 2430 is also connected to the rear side of the connecting frame 2410 by means of hooks or fasteners. When the user uses the seat and leans against 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 spring 2430 can absorb and disperse the pressure from the user's back, playing a role in shock absorption and pressure reduction, thereby greatly improving the comfort of use.

[0031] Furthermore, the introduction of spring 2430 gives the back support device a certain degree of self-adaptability. When the user adjusts the height of the back support, spring 2430 can extend and retract accordingly based on the user's movements and force, ensuring that the back support structure 2400 can move smoothly to the desired position and provide appropriate support when the user leans back.

[0032] Reference Figures 4 to 7 , Figure 8 According to the back support device provided in the first aspect embodiment of this utility model, a guide strip 2140 is provided on the front side of the slide 2100, and a connecting frame 2410 is provided with a guide groove 2411 that extends through the front and rear. The guide strip 2140 is engaged with the guide groove 2411 and extends to the front side of the connecting frame 2410. A limiting member 2440 is connected to the front end of the guide strip 2140 to limit the connecting frame 2410 to the slide 2100. The guide strip 2140 is provided on the front side of the slide 2100. The guide strip 2140 can be made of plastic and has a certain rigidity and wear resistance. The guide strip 2140 can be fixed to the slide 2100 by fasteners or can be integrally formed with the slide 2100. The shape of the guide strip 2140 matches the guide groove 2411 provided on the connecting frame 2410 to ensure that it can be tightly engaged. The guide groove 2411 is designed to extend through the front and rear, so that the guide strip 2140 can pass through it and extend to the front side of the connecting frame 2410. A limiting member 2440 is connected to the front end of the guide bar 2140. The limiting member 2440 is a rectangular block. When the guide bar 2140 is fully inserted into the guide groove 2411, the limiting member 2440 is connected to the front end of the guide bar 2140 by fasteners and abuts against the front side of the connecting frame 2410, thereby effectively limiting the connecting frame 2410 on the slide block 2100 and preventing it from detaching from the slide block 2100 or causing unnecessary shaking during the sliding process.

[0033] Understandably, the coordinated design of the guide bar 2140 and guide groove 2411 not only improves the sliding stability of the connecting bracket 2410 on the slide block 2100, but also ensures the accuracy and reliability of the back support structure 2400 when adjusting its height. Users can adjust the height of the back support more smoothly during use without worrying about the connecting bracket 2410 loosening or falling off, thus enhancing the safety and durability of the entire back support device.

[0034] Reference Figures 1 to 7According to the back support device provided in the first aspect embodiment of this utility model, the front side of the slide 2100 is provided with two guide bars 2140. The two guide bars 2140 are respectively located on both sides of the front side of the slide 2100, and the two guide bars 2140 are parallel to each other and spaced a certain distance apart. The design of the guide bars 2140 maintains its rigidity and wear resistance to ensure that it can be stably engaged in the guide grooves 2411 on the connecting frame 2410. Similarly, the two guide grooves 2411 on the connecting frame 2410 are also respectively set at positions corresponding to the guide bars 2140, and their shape and size match the guide bars 2140, so that each guide bar 2140 can be accurately inserted into a guide groove 2411. The design of double guide bars 2140 and double guide grooves 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 tilting or shaking during the sliding process. Even when subjected to significant external forces or vibrations during use, the dual-guide structure ensures that the connecting bracket 2410 remains in the correct position, thereby improving the impact resistance and durability of the entire back support device.

[0035] Furthermore, the dual-guide structure design makes the back support device more stable and smooth when adjusting the height. Users can more easily push the back support structure 2400 without worrying that the connecting bracket 2410 will deviate from the track or get stuck, thus achieving a more convenient and comfortable seat height adjustment function.

[0036] Reference Figures 2 to 5 According to the back support device provided in the first aspect embodiment of this utility model, the back frame assembly 2000 further includes a locking structure 2500, which is configured to lock the connecting bracket 2410 to the slide 2100, thereby restricting the vertical movement of the locking structure 2500. During daily use, the user can control the locking structure 2500 as needed, thereby controlling the state of the back frame 2420. The back frame 2420 has an unlocked state and a locked state. When the back frame 2420 is controlled to the unlocked state by the locking structure 2500, the connecting bracket 2410 and the back frame 2420 can move vertically relative to the slide 2100, allowing the spring 2430 to absorb and disperse pressure from the user's back, providing shock absorption and pressure relief. When the back frame 2420 is controlled to the locked state by the locking structure 2500, the connecting bracket 2410 and the back frame 2420 are fixed to the slide 2100, thereby providing stable support for the user's back.

[0037] Reference Figures 2 to 5According to the back support device provided in the first aspect embodiment of this utility model, 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 located on one side of the locking groove 2441 and can be a resilient claw, pin, or other structure capable of engaging with the locking groove 2441 and maintaining 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 can drive the locking member 2520 to move simply by gently pushing, pressing, or rotating it. When the user needs to lock the connecting bracket 2410, operating the drive component 2510 moves the locking component 2520, causing it to engage in the locking slot 2441, thus achieving stable fixation of the connecting bracket 2410 on the slide block 2100. Conversely, when the user needs to unlock the connecting bracket 2410, simply operating the drive component 2510 in reverse will disengage the locking component 2520 from the locking slot 2441, allowing the connecting bracket 2410 to slide freely on the slide block 2100. This locking structure 2500 design not only improves the stability and safety of the back support device but also allows users to more easily and conveniently adjust and fix the height of the back support during use. Users can lock and unlock with simple operations, without additional tools or complicated steps, greatly improving ease of use and user experience.

[0038] Reference Figures 2 to 5 According to the back support device provided in the first aspect embodiment of this utility model, 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 driving member 2510, allowing the driving member 2510 to rotate around it. The driving member 2510 can be a handle, knob, or other component suitable for user operation. The driving member 2510 is rotatably connected to the rotating column 2421, and the user can apply force by rotating the driving member 2510. On the front side of the connecting frame 2410, a mounting groove extending toward the limiting member 2440 is provided. The mounting groove provides a receiving space for the locking member 2520, and its shape and size match the locking member 2520 to ensure that the locking member 2520 can slide stably within it. The locking member 2520 is placed in the mounting groove and connected to the driving member 2510. This connection method allows the locking member 2520 to slide within the mounting groove when the user rotates the driving member 2510, thereby achieving the locking and unlocking functions.

[0039] When the user needs to lock the connecting bracket 2410, simply rotate the drive component 2510. Through the connection between the drive component 2510 and the locking component 2520, the locking component 2520 will be driven and slide into the locking groove 2441 of the limiting component 2440 until it is engaged in the locking groove 2441, thus fixing the connecting bracket 2410. Conversely, when the user needs to unlock the connecting bracket 2410, rotate the drive component 2510 in the opposite direction. The locking component 2520 will be driven and slide out of the locking groove 2441, at which point the connecting bracket 2410 can slide freely on the slide block 2100. This not only makes the locking structure 2500 more compact and stable, but also greatly improves the convenience of user operation. The user can lock and unlock with a simple rotation action, without additional force or complicated steps. At the same time, the design of the mounting groove also ensures the stability and accuracy of the locking component 2520 during the sliding process, avoiding problems such as locking failure or unlocking difficulties caused by the offset or shaking of the locking component 2520.

[0040] Reference Figure 4 According to the back support device provided in the first aspect embodiment of this utility model, two locking slots 2441 are now provided on one side of the limiting member 2440. The two locking slots 2441 are arranged at intervals from top to bottom, providing two different engagement positions for the locking member 2520. By providing two locking slots 2441, more adjustment options and stability are provided for the adjustment of the back frame 2420. Users can choose to engage the locking member 2520 in the upper locking slot 2441 or the lower locking slot 2441 according to their needs or preferences, thereby adjusting the height of the back support.

[0041] Reference Figure 1 Understandably, the back support device also includes a lumbar support 2600. The lower end of the connecting frame 2410 is provided with a connecting arm. 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 and the lumbar support 2600 can stably support the user's waist.

[0042] The seat provided according to the second aspect embodiment of the present invention has all the beneficial effects of the first aspect embodiment of the present invention.

[0043] Thirdly, referring to Figures 1 to 7 The back support device according to an embodiment of the present utility model includes: Back support 1000; A slide block 2100 is connected to the front side of the back support 1000 and can slide up and down; A back frame assembly 2000 is connected to the front side of the slide block 2100 and can slide up and down; A first adjustable limiting mechanism is disposed between the back support 1000 and the slide 2100 to limit the sliding of the slide 2100 relative to the back support 1000; The second adjustable limiting mechanism is disposed between the slide block 2100 and the back frame assembly 2000, and is used to limit the sliding of the back frame assembly 2000 relative to the slide block 2100.

[0044] For ease of explanation, the following three states will be distinguished separately: 1. When only the first adjustable limiting mechanism is in a state that restricts the relative sliding between the back support 1000 and the slide 2100, and the second adjustable limiting mechanism is in a state that does not restrict the relative sliding between the back frame assembly 2000 and the slide 2100, this is called the first adjustment state. 2. When only the second adjustable limiting mechanism is in a state that restricts the relative sliding between the back frame assembly 2000 and the slide 2100, and the first adjustable limiting mechanism is in a state that does not restrict the relative sliding between the back support 1000 and the slide 2100, this is called the second adjustment state. 3. When the first adjustable limiting mechanism is in a state of relative sliding between the unrestricted back support 1000 and the slide 2100, and the second adjustable limiting mechanism is also in a state of relative sliding between the unrestricted back frame assembly 2000 and the slide 2100, it is called the third adjustment state. Working principle description: When it is necessary to adjust the height of the back frame assembly 2000, the user can adjust the height of the back frame assembly 2000 in either the first adjustment state or the second adjustment state. If the height can be adjusted to a suitable level in the first or second adjustment state, the corresponding adjustable limit mechanism can be restored to its limit state to keep the position of the back frame assembly 2000, slide 2100 and back support 1000 fixed without further adjustment. If the user cannot directly adjust the height to a suitable level in either the first or second adjustment state, they can first adjust the back frame component 2000 to its extreme position in either state, such as the highest or lowest position in the current adjustment state. Then, they can switch to another adjustment state to further adjust the height of the back frame component 2000. This will allow the user to adapt to the needs of people of different heights and improve the range of adaptability.

[0045] Furthermore, it is understandable that in the normal adjustment state, the adjustment is usually made by switching between the first and second adjustment states; after the user is familiar with it, the relative position of the back frame assembly 2000 and the back support 1000 can also be directly adjusted in the third adjustment state.

[0046] According to an embodiment of the third aspect of this utility model, by such a setting, at least the following effects can be achieved: by coordinating the up-and-down sliding between the back support 1000 and the slide 2100, the up-and-down sliding between the back frame assembly 2000 and the slide 2100, and the first adjustable limiting mechanism and the second adjustable limiting mechanism, a two-stage adjustment method is realized. This can effectively increase the sliding stroke of the back frame assembly 2000 relative to the back support 1000, thereby adapting to the needs of more people of different heights and improving the adaptability range.

[0047] In this embodiment, a connecting plate 1100 is provided at the upper end of the back support 1000, and a slide block 2100 is connected to the front side of the connecting plate 1100 via a slide rail. The back support 1000 is made of a rigid material and has sufficient strength and stability. The connecting plate 1100 is located at the upper end of the back support 1000 and can be integrally formed with the back support 1000. The back frame assembly 2000 includes a connecting bracket 2410 and a back frame 2420. The connecting bracket 2410 is connected to the front side of the slide block 2100 and can slide up and down. The connecting bracket 2410 serves as a connecting bridge between the back frame assembly 2000 and the slide block 2100, and its structural strength and stability are good. The rear side of the connecting bracket 2410 is reliably connected to the front side of the slide block 2100 by bolts or other reliable means to ensure that it will not loosen or fall off during use.

[0048] The back frame 2420 is the part that directly contacts the user's back, and its shape and material selection directly affect 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 made of soft fabric, sponge, or memory foam to improve comfort. In addition, the back frame 2420 is fixed to the front side of the connecting frame 2410 by fasteners such as bolts, nuts, or clips. This fixing method ensures a firm connection between the back frame 2420 and the connecting frame 2410, and also facilitates the disassembly and replacement of the back frame 2420 when needed to meet the needs of different users or different usage scenarios.

[0049] In some embodiments of this utility model, the first adjustable limiting mechanism includes: Multiple gear slots 1110 are provided in the middle of the connecting plate 1100 of the back support 1000, and the multiple gear slots 1110 open upward and are arranged at intervals from top to bottom. The snap-fit ​​component 2200 is movably disposed among the plurality of said gear slots 1110; When the snap-fit ​​2200 is snapped into any of the gear slots 1110, the snap-fit ​​2200 and the corresponding gear slot 1110 cooperate to restrict the sliding block 2100 from sliding relative to the back support 1000.

[0050] In some embodiments of this utility model, the first adjustable limiting mechanism further includes: Separating block 1120 is disposed at the upper end of the plurality of gear slots 1110; A reset block 1130 is disposed at the lower end of the plurality of gear slots 1110; A receiving groove 2110 is provided on the rear side of the slide block 2100; The snap-fit ​​groove 2120 is located on the rear side of the slide 2100 and communicates with the receiving groove 2110; Separation groove 2130 is provided on the rear side of the slide 2100 and communicates with the receiving groove 2110 and the snap-fit ​​groove 2120 respectively. Separation groove 2130 is located on one side of snap-fit ​​groove 2120. Elastic element 2300, wherein the elastic element 2300 is disposed within the receiving groove 2110; The snap-fit ​​component 2200 includes snap-fit ​​teeth 2210 and snap-fit ​​posts 2220. The snap-fit ​​component 2200 is disposed in the receiving groove 2110 and the snap-fit ​​teeth 2210 extend toward the gear position groove 1110 and are disposed between the gear position groove 1110 and the slide block 2100. The snap-fit ​​component 2200 is disposed in the receiving groove 2110 and the snap-fit ​​teeth 2210 extend toward the gear position groove 1110. The snap-fit ​​post 2220 is snapped into the snap-fit ​​groove 2120. The elastic element 2300 is configured to push the snap-fit ​​element 2200 so that the snap-fit ​​tooth 2210 engages with the gear slot 1110; When the back frame assembly 2000 is pushed up or down, when the locking tooth 2210 slides past the uppermost gear slot 1110, the locking tooth 2210 abuts against the separating block 1120. The separating block 1120 can push the locking tooth 2210 to make the locking post 2220 engage in the separating groove 2130, and the locking tooth 2210 remains separated from the gear slot 1110. When the locking tooth 2210 slides past the lowermost gear slot 1110, the locking tooth 2210 abuts against the reset block 1130. The reset block 1130 can push the locking tooth 2210 to make the locking post 2220 engage in the locking groove 2120. The elastic member 2300 can push the locking member 2200 to make the locking tooth 2210 engage in the gear slot 1110.

[0051] Specifically, in this embodiment, multiple gear slots 1110 are arranged with their openings facing upwards and at equal intervals from top to bottom. The snap-fit ​​component 2200 is made of plastic, and the elastic component 2300 is a spring. In use, the user can push the back frame 2420 or the connecting frame 2410 to raise or lower the back frame assembly 2000. When the back frame 2420 or the connecting frame 2410 is pushed upwards, the snap-fit ​​teeth 2210 will slide sequentially over multiple gear slots 1110 until the uppermost gear slot 1110. At this time, the snap-fit ​​teeth 2210 will abut against the separating block 1120. The separating block 1120 pushes the snap-fit ​​teeth 2210 so that the snap-fit ​​post 2220 on one side of the snap-fit ​​component 2200 is engaged in the separating groove 2130. The snap-fit ​​teeth 2210 remain separated from the gear slots 1110, and the user can then push the back frame assembly 2000 downwards. Similarly, when the back frame 2420 or connecting bracket 2410 is pushed down, the locking teeth 2210 remain separated from the stop groove 1110 and slide past the lowest stop groove 1110. At this time, the locking teeth 2210 abut against the reset block 1130, and the reset block 1130 pushes the locking teeth 2210 so that the locking pin 2220 is engaged in the locking groove 2120. Under the action of the elastic member 2300, the locking member 2200 is pushed, so that the locking teeth 2210 are engaged in the corresponding stop groove 1110, thereby fixing the back frame assembly 2000.

[0052] Reference Figure 7 It is understandable that the slide 2100 is connected to the limiting cover 2150 so as to limit the snap-fit ​​member 2200 and the elastic member 2300 within the receiving groove 2110.

[0053] According to the back support device provided in the third aspect embodiment of this utility model, the first adjustable limiting mechanism is provided with multiple stop slots 1110 on the connecting plate 1100. The multiple stop slots 1110 provide support points of different heights for the back frame assembly 2000, allowing the user to adjust the height of the back support according to their needs. At the same time, the coordinated work between the slide 2100, the snap-fit ​​member 2200, the elastic member 2300, the back frame 2420, and the connecting frame 2410 ensures the smoothness and stability of the adjustment process. During the adjustment process, the snap-fit ​​teeth 2210 of the snap-fit ​​member 2200 can be engaged in different stop slots 1110 to fix the back frame assembly 2000; when adjustment is required, by pushing the back frame 2420 and the connecting frame 2410, the snap-fit ​​teeth 2210 can smoothly disengage from the stop slots 1110 under the action of the separating block 1120 or the reset block 1130, and then re-engage in the stop slots 1110, thereby realizing the raising or lowering of the back frame assembly 2000. This not only improves the comfort and practicality of the seat, but also enhances its adaptability and flexibility, meeting the personalized needs of different users for back support height.

[0054] In some embodiments of this utility model, the second adjustable limiting mechanism includes a spring 2430, one end of which is connected to the slide block 2100 and the other end is connected to the rear side of the back frame assembly 2000. When the back frame assembly 2000 slides relative to the slide block 2100, the spring 2430 deforms, and the elastic force of the spring 2430 is used to drive the back frame assembly 2000 to reset.

[0055] Specifically, in this embodiment, one end of the spring 2430 is connected to the slide block 2100, and the other end is connected to the rear side of the connecting frame 2410. The connecting frame 2410 is not only connected to the front side of the slide block 2100, but also has a structure that can slide up and down relative to the slide block 2100. The sliding connection between the connecting frame 2410 and the slide block 2100 can be achieved by setting a slide rail, slide groove, or other structure between the connecting frame 2410 and the slide block 2100, ensuring the stability and smoothness of the connecting frame 2410 during the sliding process. The spring 2430 of the second adjustable limiting mechanism is disposed between the slide block 2100 and the connecting frame 2410. The upper end of the spring 2430 is connected to the slide block 2100 by means of hooks or fasteners, and similarly, the lower end of the spring 2430 is also connected to the rear side of the connecting frame 2410 by means of hooks or fasteners.

[0056] When only spring 2430 is used, the second adjustable limiting mechanism is a passive adjustment structure. In the aforementioned second adjustment state, i.e., when the user is not leaning against the back frame 2420, it can be considered that the second adjustable limiting mechanism is in a state that restricts the relative sliding between the back frame assembly 2000 and the slide 2100. The user first adjusts the relative position between the slide 2100 and the back support 1000 to a suitable position. After the user uses the seat and leans against the back frame 2420, in actual use... When a user leans against the back frame 2420 and applies pressure, the vertical component of the pressure is distributed to the spring 2430, causing the back frame 2420 to slide vertically relative to the slide block 2100. This allows the back frame to adjust to a suitable height based on the user's force, improving the user experience. When the user leaves the back frame 2420, the spring 2430 can also drive the back frame 2420 to return to its original position. Therefore, the second adjustable limiting mechanism uses the spring 2430, giving the back support device a certain degree of self-adaptability. When the user adjusts the height of the back support, the spring 2430 can extend and retract accordingly based on the user's movements and force, ensuring that the back frame 2420 can move smoothly to the desired position and provide appropriate support when the user leans against it.

[0057] Meanwhile, the connecting frame 2410 and the back frame 2420 can move up and down relative to the slide 2100, so that the spring 2430 can absorb and disperse the pressure from the user's back, playing a role in shock absorption and pressure reduction, thereby greatly improving the comfort of use.

[0058] In some embodiments of this utility model, the second adjustable limiting mechanism further includes: A guide groove 2411 that runs through the front and back is provided on the back frame assembly 2000; A guide bar 2140 is provided on the front side of the slide block 2100. The guide bar 2140 is engaged with the guide groove 2411 and extends to the front side of the back frame assembly 2000. A limiting member 2440 is connected to the front end of the guide strip 2140 to limit the back frame assembly 2000 to the slide 2100.

[0059] Specifically, in this embodiment, the limiting member 2440 confines the connecting frame 2410 to the slide 2100. The guide strip 2140 can be made of plastic and has a certain degree of rigidity and wear resistance. The guide strip 2140 can be fixed to the slide 2100 by fasteners or can be integrally formed with the slide 2100. The shape of the guide strip 2140 matches the guide groove 2411 provided on the connecting frame 2410, ensuring that it can be tightly inserted into it. The guide groove 2411 is designed to run through from front to back, allowing the guide strip 2140 to pass through it and extend to the front side of the connecting frame 2410. The limiting member 2440 is connected to the front end of the guide strip 2140. The limiting member 2440 is a rectangular block. When the guide bar 2140 is fully inserted into the guide groove 2411, the limiting member 2440 is connected to the front end of the guide bar 2140 by fasteners and abuts against the front side of the connecting frame 2410, thereby effectively limiting the connecting frame 2410 on the slide block 2100 and preventing it from detaching from the slide block 2100 or causing unnecessary shaking during the sliding process.

[0060] Understandably, the coordinated design of the guide bar 2140 and guide groove 2411 not only improves the sliding stability of the connecting bracket 2410 on the slide 2100, but also ensures the accuracy and reliability of the back frame 2420 and connecting bracket when adjusting the height. Users can adjust the height of the back support more smoothly during use without worrying about the connecting bracket 2410 loosening or falling off, thus enhancing the safety and durability of the entire back support device.

[0061] In some embodiments of this utility model, the front side of the slide 2100 is provided with two guide strips 2140, and the back frame assembly 2000 is provided with two guide grooves 2411, with each guide strip 2140 inserted into one guide groove 2411.

[0062] Specifically, in this embodiment, the front side of the slide 2100 is provided with two guide bars 2140. The two guide bars 2140 are located on both sides of the front side of the slide 2100, and are parallel to each other and spaced a certain distance apart. The design of the guide bars 2140 maintains its rigidity and wear resistance to ensure that they can be stably engaged in the guide grooves 2411 on the connecting frame 2410. Similarly, the two guide grooves 2411 on the connecting frame 2410 are also respectively set at positions corresponding to the guide bars 2140, and their shape and size match the guide bars 2140, so that each guide bar 2140 can be accurately inserted into a guide groove 2411. The design of double guide bars 2140 and double guide grooves 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 tilting or shaking during the sliding process. Even when subjected to significant external forces or vibrations during use, the dual-guide structure ensures that the connecting bracket 2410 remains in the correct position, thereby improving the impact resistance and durability of the entire back support device.

[0063] Furthermore, the dual-guide structure design makes the back support device more stable and smooth when adjusting the height. Users can more easily push the back frame 2420 or the connecting bracket 2410 without worrying that the connecting bracket 2410 will deviate from the track or get stuck, thus achieving a more convenient and comfortable seat height adjustment function.

[0064] In some embodiments of the present invention, the second adjustable limiting mechanism further includes a locking structure 2500, which is configured to lock the back frame assembly 2000 to the slide block 2100, thereby restricting the movement of the back frame assembly 2000 in the vertical direction.

[0065] During daily use, the user can control the locking structure 2500 as needed, thereby controlling the state of the back frame 2420. The back frame 2420 has an unlocked state and a locked state. When the back frame 2420 is unlocked by controlling the locking structure 2500, the connecting bracket 2410 and the back frame 2420 can move up and down relative to the slide 2100, so that the spring 2430 can not only be in a passive adjustment state, but also absorb and disperse the pressure from the user's back, playing a role in shock absorption and pressure reduction; when the back frame 2420 is locked by controlling the locking structure 2500, the connecting bracket 2410 and the back frame 2420 are fixed on the slide 2100, thereby providing stable support for the user's back.

[0066] In some embodiments of this utility model, a locking groove 2441 is provided on one side of the limiting member 2440, and the locking structure 2500 includes: Locking member 2520, the locking member 2520 is disposed on one side of the locking groove 2441; A drive member 2510 is connected to the back frame assembly 2000 and to the locking member 2520. The drive member 2510 is configured to move the locking member 2520 so that the locking member 2520 engages with the locking slot 2441, or so that the locking member 2520 disengages from the locking slot 2441.

[0067] In this embodiment, the locking groove 2441 is designed for the insertion of the locking member 2520, and is used to engage with the locking member 2520 to prevent the connecting frame 2410 from moving on the slide 2100. The locking member 2520 is located on one side of the locking groove 2441 and can be a resilient claw, pin, or other structure that can engage with the locking groove 2441 and remain stable. 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 can drive the locking member 2520 to move by simply pushing, pressing, or rotating it. When the user needs to lock the connecting frame 2410, by operating the driving member 2510, the locking member 2520 can be moved and engaged in 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 bracket 2410, they only need to reverse the operation of the drive component 2510 to separate the locking component 2520 from the locking slot 2441, at which point the connecting bracket 2410 can slide freely on the slide block 2100. This locking structure 2500 design not only improves the stability and safety of the back support device, but also allows users to more easily and conveniently adjust and fix the height of the back support during use. Users can lock and unlock with simple operations, without additional tools or complicated steps, thus greatly improving the convenience and user experience.

[0068] In some embodiments of this utility model, the front side of the back frame assembly 2000 is provided with a rotating column 2421, the driving member 2510 is rotatably connected to the rotating column 2421, the front side of the back frame assembly 2000 is provided with a mounting groove extending toward the limiting member 2440, the locking member 2520 is disposed in the mounting groove and can slide, the driving member 2510 is connected to the locking member 2520, and rotating the driving member 2510 can drive the locking member 2520 to slide.

[0069] In this embodiment, the rotating column 2421 serves as the rotation axis of the drive member 2510, allowing the drive member 2510 to rotate around it. The drive member 2510 can be a handle, knob, or other user-operable component. The drive member 2510 is rotatably connected to the rotating column 2421, and the user can apply force by rotating the drive member 2510. On the front side of the back frame assembly 2000 connecting bracket 2410, a mounting groove extending towards the limiting member 2440 is provided. The mounting groove provides a receiving space for the locking member 2520, and its shape and size match the locking member 2520 to ensure that the locking member 2520 can slide stably within it. The locking member 2520 is placed within the mounting groove and connected to the drive member 2510. This connection method allows the locking member 2520 to slide within the mounting groove when the user rotates the drive member 2510, thereby achieving the locking and unlocking functions.

[0070] When the user needs to lock the connecting bracket 2410, simply rotate the drive component 2510. Through the connection between the drive component 2510 and the locking component 2520, the locking component 2520 will be driven and slide into the locking groove 2441 of the limiting component 2440 until it is engaged in the locking groove 2441, thus fixing the connecting bracket 2410. Conversely, when the user needs to unlock the connecting bracket 2410, rotate the drive component 2510 in the opposite direction. The locking component 2520 will be driven and slide out of the locking groove 2441, at which point the connecting bracket 2410 can slide freely on the slide block 2100. This not only makes the locking structure 2500 more compact and stable, but also greatly improves the convenience of user operation. The user can lock and unlock with a simple rotation action, without additional force or complicated steps. At the same time, the design of the mounting groove also ensures the stability and accuracy of the locking component 2520 during the sliding process, avoiding problems such as locking failure or unlocking difficulties caused by the offset or shaking of the locking component 2520.

[0071] In some embodiments of this invention, two locking slots 2441 are now provided on one side of the limiting member 2440. The two locking slots 2441 are arranged at intervals from top to bottom, providing two different engagement positions for the locking member 2520. By providing two locking slots 2441, more adjustment options and stability are provided for the adjustment of the back frame 2420. Users can choose to engage the locking member 2520 with the upper locking slot 2441 or the lower locking slot 2441 according to their needs or preferences, thereby adjusting the height of the back support.

[0072] Reference Figure 1Understandably, the back support device also includes a lumbar support 2600. The lower end of the connecting frame 2410 is provided with a connecting arm. 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 and the lumbar support 2600 can stably support the user's waist.

[0073] The seat provided according to the fourth aspect embodiment of the present invention has all the beneficial effects of the third aspect embodiment of the present invention.

[0074] Other configurations and operations of the seat according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0075] The above description is merely a preferred embodiment of this utility model. This utility model is not limited to the above-described embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this disclosure, as long as they achieve the same technical effect, should be included within the scope of protection of this disclosure and fall under the protection scope of this utility model. Within the protection scope of this utility model, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A back support device, characterized in that, include: Back support; A slide block, which is connected to the front side of the back support and can slide up and down; A back frame assembly, which is connected to the front side of the slide and is capable of sliding up and down; A first adjustable limiting mechanism is provided between the back support and the slide block to limit the sliding of the slide block relative to the back support; A second adjustable limiting mechanism is provided between the slide and the back frame assembly to limit the sliding of the back frame assembly relative to the slide.

2. The back support device according to claim 1, characterized in that, The first adjustable limit mechanism includes: Multiple gear slots are provided in the middle of the connecting plate of the back bracket, and the multiple gear slots are arranged with their openings facing upwards and spaced apart from top to bottom; A snap-fit ​​connector is movably disposed among the plurality of said gear slots; When the snap-fit ​​component is snapped into any of the gear slots, the snap-fit ​​component and the corresponding gear slot cooperate to restrict the sliding of the slide block relative to the back support.

3. The back support device according to claim 2, characterized in that: The first adjustable limit mechanism further includes: A separation block is disposed at the upper end of the plurality of gear slots; A reset block is located at the lower end of the plurality of gear slots; A receiving groove is provided on the rear side of the slide block; A snap-fit ​​groove is provided on the rear side of the slide and communicates with the receiving groove; A separation groove is provided on the rear side of the slide and communicates with the receiving groove and the snap-fit ​​groove respectively. The separation groove is located on one side of the snap-fit ​​groove. An elastic element is disposed within the receiving groove; The latching member includes latching teeth and latching posts. The latching member is disposed in the receiving groove and the latching teeth extend toward the gear position groove and are disposed between the gear position groove and the slide block. The latching member is disposed in the receiving groove and the latching teeth extend toward the gear position groove. The latching posts are latched into the latching groove. The elastic element is configured to push the snap-fit ​​element to engage the snap-fit ​​teeth into the gear slot; When the back frame assembly is pushed up or down, when the locking tooth slides past the uppermost gear slot, the locking tooth abuts against the separating block. The separating block can push the locking tooth to make the locking pin engage in the separating slot, and the locking tooth remains separated from the gear slot. When the locking tooth slides past the lowermost gear slot, the locking tooth abuts against the reset block. The reset block can push the locking tooth to make the locking pin engage in the locking slot. The elastic member can push the locking member to make the locking tooth engage in the gear slot.

4. The back support device according to claim 1, characterized in that, The second adjustable limiting mechanism includes a spring, one end of which is connected to the slide block and the other end of which is connected to the rear side of the back frame assembly. When the back frame assembly slides relative to the slide block, the spring deforms, and the spring force is used to drive the back frame assembly to reset.

5. The back support device according to claim 4, characterized in that: The second adjustable limit mechanism also includes: A guide groove running through the front and back is provided on the back frame assembly; A guide bar is provided on the front side of the slide block, the guide bar is engaged in the guide groove and extends to the front side of the back frame assembly; A limiting member, connected to the front end of the guide strip, is used to limit the back frame assembly to the slide.

6. The back support device according to claim 5, characterized in that: The second adjustable limiting mechanism further includes a locking structure configured to lock the back frame assembly to the slide, thereby restricting the movement of the back frame assembly in the vertical direction.

7. The back support device according to claim 6, characterized in that, The limiting member has a locking groove on one side, and the locking structure includes: A locking element, wherein the locking element is disposed on one side of the locking groove; A drive member connected to the back frame assembly and to the locking member, the drive member being configured to move the locking member to engage the locking member in the locking slot, or to disengage the locking member from the locking slot.

8. The back support device according to claim 7, characterized in that, The front side of the back frame assembly is provided with a rotating column, the driving member is rotatably connected to the rotating column, the front side of the back frame assembly 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.

9. The back support device according to claim 8, characterized in that, The front side of the slide is provided with two guide strips, and the back frame assembly is provided with two guide slots, with each guide strip inserted into one guide slot. The limiting member has two locking slots on one side, and the two locking members are arranged at intervals from top to bottom, with the locking member engaging one of the locking slots.

10. A type of seat, characterized in that: Includes the back support device as described in any one of claims 1 to 9.

Images