Backrest lifting self-circulation adjusting device

Abstract

This invention discloses a backrest height adjustment device with self-circulating circulation. It includes a support body and a sliding seat. The support body is vertically arranged, and a through-slide groove is provided in the middle of the support body along the vertical direction. A hooking tooth portion is provided on one of the vertical sidewalls of the through-slide groove. The hooking tooth portion includes hooking teeth, an upper guide block, and a lower guide block. The bottom surface of the hooking teeth extends obliquely upwards, and a groove is formed between adjacent hooking teeth. The sliding seat is fitted onto the support body and can slide up and down along the support body. A locking assembly is provided on the inner sidewall of the sliding seat. The locking assembly includes a locking block rotatably mounted on the sliding seat and an elastic element fixedly mounted on the sliding seat. The top and bottom surfaces of the locking block both extend obliquely upwards. A locking block with a corresponding groove is provided on the end face of the locking block facing the hooking teeth. The elastic element includes a hooking part and an elastic part. The locking block has a hook groove that matches the hooking part. The hooking part and the hook groove can be in an engaged state and a disengaged state. This invention simplifies the method of adjusting the seat backrest height.

Description

Technical Field

[0001] This invention relates to the field of seating, and more particularly to a backrest lifting and self-circulating adjustment device. Background Technology

[0002] The seat back provides support to the back when the user is seated, effectively improving seat comfort. To accommodate people of different heights and body types, seat backs are usually height-adjustable. Some existing seats use a snap-fit ​​structure to adjust the seat back height; however, this type of structure requires the user to use both hands to adjust the backrest height, which is inconvenient.

[0003] Chinese Patent Publication No. CN201821358814.2, published on July 6, 2021, discloses an adjustment mechanism for the backrest of an office chair. The mechanism includes a sliding plate, a locking block groove, and a shift groove. An aluminum box is connected to the upper end of the sliding plate, and locking strip grooves are formed on both sides of the upper surface of the sliding plate. Locking strips are installed inside the locking strip grooves. The locking block groove is located on the lower inner surface of the sliding plate, and a locking block is installed within it. A groove is formed on the right side of the locking block groove, and a torsion spring groove is provided on the right side of the groove, with a torsion spring installed within it. The shift groove is located on the upper surface of the aluminum box. This patent allows for multiple adjustment levels when raising the chair back; however, each adjustment requires the user to use one hand to manipulate the upper protrusion of the locking block until it disengages from the serrated part of the shift groove, and then use the other hand to slide the aluminum box up and down to raise or lower the chair back. This process requires the user to operate with both hands simultaneously, which is very inconvenient.

[0004] Chinese Patent Publication No. CN201020217501.2, published on June 2, 2010, discloses a chair back height adjustment device, including a chair back connector and a chair seat connector. The chair back connector is provided with a plurality of interconnected height selection holes. The chair seat connector is provided with a mounting hole and a locking hole communicating with the mounting hole. A height adjustment member is inserted between the height selection hole and the mounting hole. One end of the height adjustment member is fastened to the chair back connector, and the other end of the height adjustment member is fastened to the chair seat connector. Paragraph 0022 of the application specification discloses that "when it is necessary to adjust the height of the chair back, first move the height adjustment component 3 from the locking hole 212 to the mounting hole 211, then adjust the height of the chair back connector 1 and make one end of the height adjustment component 3 engage from one height selection hole 12 into another height selection hole 12, and finally move the other end of the height adjustment component 3 to engage it again in the locking hole 212, thereby completing the adjustment." This passage shows that adjusting the backrest height still requires the user to use both hands, making convenient adjustment of the seat back height impossible.

[0005] In addition, when adjusting the height of this type of seat, the locking block and the gear shift groove will collide hard, resulting in a lot of noise when the seat back is adjusted. Summary of the Invention

[0006] To address the aforementioned technical problems, the main objective of this invention is to provide a backrest height adjustment device with self-circulating mechanism. This device utilizes a toothed section within a through-slide groove on the support body and a locking component on the sliding seat. This allows the sliding seat to be fixed at different positions on the support body. When the curved seat slides to the top of the toothed section, the upper guide block guides the locking block into the through-slide groove away from the toothed section. The locking block disengages from the slot, and the hook is engaged with the slot. At this point, the locking block avoids the toothed section and slides downwards along the through-slide groove under its own weight. When the curved seat slides to the bottom of the toothed section, the lower guide block guides the locking block to engage with the toothed section, and the hook is disengaged from the slot. At this point, the locking block engages again with the lower toothed section. Therefore, when adjusting the seat backrest height, the user only needs to pull the seat backrest to fully adjust the height. This adjustment method can be completed with one hand, making it convenient and quick.

[0007] A secondary objective of this invention is to solve the problem of excessive noise when adjusting the height of the seat backrest by covering the outer surface of the locking block with a flexible rubber layer, thereby reducing the noise when the locking block collides with the gear teeth.

[0008] The technical solution of this invention is implemented as follows: A backrest lifting self-circulating adjustment device includes: A support body is vertically arranged. A through groove is provided in the middle of the support body along the vertical direction. A hanging tooth part is provided on one of the vertical side walls of the through groove. The hanging tooth part includes a vertically arranged base plate, an upper guide block and a lower guide block spaced apart on the surface of the base plate, and multiple hanging teeth are provided on the surface of the base plate along its own length direction. The multiple hanging teeth are spaced apart and located between the upper guide block and the lower guide block. The angle between the top surface of the hanging tooth and the adjacent base plate surface is not greater than 90 degrees. The bottom surface of the hanging tooth extends obliquely upward. A groove is formed between two adjacent hanging teeth. The bottom surface of the upper guide block extends obliquely upward and is higher than the hanging teeth. The top surface of the lower guide block extends obliquely upward and is higher than the hanging teeth. A sliding seat is used to mount a seat back. The sliding seat is sleeved on the support body and can slide up and down along the support body. A locking assembly is provided on the inner side wall of the sliding seat. The locking assembly is located in the through-slide groove. The locking assembly includes a locking block rotatably mounted on the sliding seat and an elastic element fixedly mounted on the sliding seat. The top and bottom surfaces of the locking block both extend obliquely upwards. Several locking blocks are provided on the end face of the locking block facing the hook teeth. The locking block is adapted to the locking slot. When the locking block is engaged in the locking slot, it is in a locked state, and the sliding seat is fixed in the locking slot. When the locking block is disengaged from the locking slot, it is in an unlocked state, and the sliding seat can slide up and down along the through groove. The elastic element includes a hooking part and an elastic part for driving the locking block toward the hooking tooth. The locking block is provided with a hook groove adapted to the hooking part. The hooking part and the hook groove have a hooked state and a disengaged state. When it is in the hooked state, part of the hooking part is engaged in the hook groove, and the locking block is disengaged from the hooking tooth. When it is in the disengaged state, the hooking part is disengaged from the hook groove and there is a gap between the hooking part and the hook groove. At this time, the locking block is engaged into the hooking tooth by the action of the elastic part.

[0009] In this design, the locking block and the toothed part have locked and unlocked states, and the hooking part and the hook groove have hooked and disengaged states. When in the unlocked state, the locking block's locking block is completely disengaged from the groove, and the hooking part and the hook groove are in a hooked state; at this time, the sliding seat can slide up and down along the support body. When in the locked state, the locking block's locking block enters the groove, and the hooking part and the hook groove are in a hooked state; at this time, the sliding seat is locked on the support body. Specifically, when the locking block and the toothed part are in the unlocked state, the height of the sliding seat can be adjusted. Pulling the sliding seat upwards causes the locking block to slide upwards along the bottom surface of the toothed part. The locking block rotates away from the toothed part until the locking block disengages from its current slot and enters the slot of the upper toothed part, at which point the sliding seat rises. Continuing to pull the sliding seat causes the locking block to disengage from each slot sequentially until it reaches the upper guide block. Continuing to pull the sliding seat causes the locking block to slide upwards along the bottom surface of the upper guide block. The locking block then moves away from the toothed part and presses against the elastic element until the hooking part enters the hook groove, i.e., the hooking part and the hook groove are in a hooked state. At this point, the locking block is completely disengaged from the slot, and the locking assembly is located on the side of the through-slide groove away from the toothed part, and can slide downwards along the through-slide groove to the bottom of the through-slide groove. When the bottom of the locking block... When the upper guide block contacts the top surface of the lower guide block, the locking block rotates towards the hook tooth, that is, the locking block moves closer to the hook tooth until the locking block's locking block enters the lowest slot of the hook tooth. Because the locking block is close to the hook tooth, the hook part moves away from the locking block until the hook part leaves the hook groove. At this time, the hook part and the hook groove are in a disengaged state. It should be noted that the bottom surface of the upper guide block extends obliquely upward and is higher than the hook tooth. That is, when the locking block slides along the bottom surface of the hook tooth, the bottom surface of the hook tooth will not force the hook part into the hook groove. However, because the bottom surface of the upper guide block is longer, when the locking block slides along the bottom surface of the upper guide block, it can press its own hook groove closer to the hook part until the hook part enters the hook groove. Similarly, the top surface of the lower guide block extends obliquely upward and is higher than the hook tooth, ensuring that when the locking block slides along the top surface of the lower guide block, the hook part can disengage from the hook groove. Understandably, during the adjustment process, when the sliding seat slides upward to the top of the support, the hook part engages with the hook groove. At this time, the locking component completely avoids the hook tooth part, meaning the sliding seat can slide freely through the groove. When the sliding seat slides downward to the top of the support, the hook part disengages from the hook groove, and the locking block on the locking block enters the locking groove... This cycle repeats continuously. During the above process, there is no need to move the locking block, and the user can adjust the height of the sliding seat with just one hand.

[0010] Preferably, the locking block and the latching block are integrally molded and both are made of rigid plastic, with the outer surface of the latching block covered by a flexible rubber layer. In actual operation, when the latching block enters the corresponding slot, the elastic portion tends to drive the latching block into the slot. By providing the flexible rubber layer, the noise from the collision between the latching block and the slot is reduced. Furthermore, when the user's back twists during seat use, the sliding seat swings left and right, which also generates noise between the latching block and the slot. The flexible rubber layer on the outer surface of the latching block not only reduces noise but also provides cushioning between the sliding seat and the locking block.

[0011] Preferably, the locking block has two locking blocks spaced apart on its end face facing the hanging teeth, and an engaging groove is formed between the two locking blocks, which is adapted to the hanging teeth. By providing two locking blocks, the locking block and the hanging teeth are doubly fixed.

[0012] Preferably, the top surface of one of the locking blocks is on the same plane as the top surface of the locking block, and the other locking block is located on the end face of the locking block facing the gear. By setting the top surface of one of the locking blocks to be on the same plane as the top surface of the locking block, that is, the top surface of the locking block and the top surface of the locking block have the same inclination angle, it is convenient to pull the sliding seat upward.

[0013] Preferably, the bottom surface of the locking tooth and the top surface of the locking block are inclined at the same angle, and the bottom surface of the upper guide block and the top surface of the lower guide block are inclined at the same angle.

[0014] Preferably, a groove is formed between the lower guide block and the substrate to match the lower end of the locking block, and the top end of the lower guide block matches the hook groove.

[0015] Preferably, the elastic element further includes a connecting portion, the elastic portion being connected to the top end of the connecting portion and abutting against the end face of the locking block away from the hook tooth, the hook portion being connected to the lower end of the connecting portion and extending toward the hook groove, the hook portion being elastic.

[0016] Preferably, the elastic element is formed by bending an elastic steel sheet, and the hook portion has an upward protrusion that matches the hook groove. Specifically, the elastic steel sheet is bent into a first segment, a second segment, and a third segment, with an upward protrusion also bent into the third segment. The first segment is the elastic part, the second segment is the connecting part, and the third segment is the hook portion, with the protrusion on the hook portion matching the hook groove. When the hook portion and the hook groove are in the hooked state, the protrusion on the hook portion engages with the hook groove. It is understood that when the hook portion and the hook groove are in the hooked state, the elastic force of the elastic part on the locking block will not cause the protrusion on the hook portion to disengage from the hook groove on its own.

[0017] Preferably, the spacing between the plurality of teeth is the same.

[0018] Preferably, the sliding seat includes a first housing and a second housing that are detachably connected. The first housing is located on the front side of the support body, and the seat back is connected to the front end face of the support body. The second housing is located on the rear side of the support body, and the second housing has a cavity that is adapted to the support body. The lower end of the support body is connected to a seat plate support body, and the seat plate of the seat is detachably connected to the top surface of the seat plate support body.

[0019] The principle and beneficial effects of the present invention, which adopts the above technical solution, are as follows: 1. The method of adjusting the seat back height is simplified. Compared with the previous adjustment structure, the support mechanism proposed in this application does not require two hands to operate, and the seat back can be raised and lowered with one hand.

[0020] 2. By covering the outer surface of the card block with a flexible rubber layer, noise during the adjustment of the seat back height is reduced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the support mechanism; Figure 2 This is an exploded diagram of the support mechanism; Figure 3 This is an internal diagram of the support mechanism; Figure 4 This is a schematic diagram showing how the locking block slides upward along the bottom surface of the upper guide block to engage with the hook groove. Figure 5 This is a schematic diagram showing the locking block and the toothed part in a locked state, and the hooking part and the hook groove in a disengaged state. Figure 6 This is a schematic diagram showing how the locking block slides upwards along the bottom surface of the lower guide block, causing the hook part to disengage from the hook groove. Figure 7 This is a schematic diagram of the gear teeth and locking assembly; Figure 8 This is a schematic diagram of the second housing and the locking assembly; Figure 9 This is a schematic diagram of the sliding seat; Figure 10 This is a schematic diagram showing the locking block and the elastic element separately; Figure 11 This is a schematic diagram showing the position changes of the slider.

[0022] The labels for the attached figures are as follows: 1. Support mechanism; 2. Support body; 3. Through groove; 4. Hanging tooth part; 5. Base plate; 6. Upper guide block; 7. Lower guide block; 8. Hanging tooth; 9. Slot; 10. Sliding seat; 11. Locking assembly; 12. Locking block; 13. Elastic element; 14. Hook part; 15. Connecting part; 16. Elastic part; 17. Locking block; 18. Engaging groove; 19. Hook groove; 20. First housing; 21. Second housing; 22. Cavity; 23. Seat plate support body; 24. Rotating shaft; 25. First hanging rod; 26. Second hanging rod; 27. Through channel; 28. Top block; 29. ​​Protrusion; 30. Shaft hole. Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0025] The specific embodiments of the present invention are as follows: like Figures 1 to 11 As shown, the present invention provides a backrest lifting self-circulating adjustment device 1, comprising: Support body 2 is vertically arranged and is a flat steel plate. A through groove 3 is provided in the middle of the support body 2 along the vertical direction. A hanging tooth part 4 is provided on one of the vertical side walls of the through groove 3. The hanging tooth part 4 includes a vertically arranged base plate 5, an upper guide block 6 and a lower guide block 7 spaced apart on the surface of the base plate 5, and a plurality of hanging teeth 8 arranged along its own length on the surface of the base plate 5. The plurality of hanging teeth 8 are spaced apart and located between the upper guide block 6 and the lower guide block 7. The angle between the top surface of the hanging tooth 8 and the surface of the adjacent base plate 5 is not greater than 90 degrees. The bottom surface of the hanging tooth 8 extends obliquely upward. A groove 9 is formed between two adjacent hanging teeth 8. The bottom surface of the upper guide block 6 extends obliquely upward and is higher than the hanging tooth 8. The top surface of the lower guide block 7 extends obliquely upward and is higher than the hanging tooth 8. A sliding seat 10 is used to install a seat backrest. The sliding seat 10 is fitted onto the support body 2 and can slide up and down along the support body 2. A locking assembly 11 is provided on the inner side wall of the sliding seat 10. The locking assembly 11 is located in the through slide groove 3. The locking assembly 11 includes a locking block 12 rotatably mounted on the sliding seat 10 and an elastic member 13 fixedly mounted on the sliding seat 10. The top and bottom surfaces of the locking block 12 extend obliquely upwards. A plurality of locking blocks 17 are provided on the end face of the locking block 12 facing the hanging tooth 8. The locking blocks 17 are adapted to the locking groove 9. The locking component 13 includes a hooking part 14 and an elastic part 16 for driving the locking block 12 toward the hook tooth 8. The locking block 12 is provided with a hook groove 19 that is adapted to the hooking part 14. The hooking part 14 and the hook groove 19 have a hooked state and a disengaged state. When it is in the hooked state, part of the hooking part 14 is inserted into the hook groove 19, and at this time the locking block 12 is disengaged from the hook tooth 4. When it is in the disengaged state, the hooking part 14 is disengaged from the hook groove 19 and there is a gap between the hooking part 14 and the hook groove 19. At this time, the locking block 12 is inserted into the hook tooth 4 under the action of the elastic part.

[0026] In this design, the locking block 12 and the toothed part 4 have locked and unlocked states, and the hooking part 14 and the hook groove 19 have hooked and disengaged states. When in the unlocked state, the locking block 17 of the locking block 12 is completely disengaged from the slot 9 and the hooking part 14 and the hook groove 19 are in the hooked state; at this time, the sliding seat 10 can slide up and down along the support body 2. When in the locked state, the locking block 17 of the locking block 12 enters the slot 9 and the hooking part 14 and the hook groove 19 are in the hooked state. At this time, the sliding seat 10 is stuck on the support body 2. Specifically, when the locking block 12 and the toothed part 4 are in the unlocked state, the height of the sliding seat 10 can be adjusted. At this time, by pulling the sliding seat 10 upward, the locking block 17 on the locking block 12 slides upward along the bottom surface of the toothed part 8, and the locking block 12 rotates away from the toothed part 4 until the locking block 17 disengages from the current slot 9 and enters the slot 9 of the upper toothed part 8. At this time, the sliding seat 10 rises. By continuously pulling the sliding seat 10, the locking block 17 disengages from each slot 9 in turn until it reaches the upper toothed part 8. At guide block 6, continue pulling the sliding seat 10. At this time, the locking block 17 slides upward along the bottom surface of the upper guide block 6. The locking block 12 moves away from the toothed part 4 and presses against the elastic member 13 until the hooking part 14 enters the hook groove 19, that is, the hooking part 14 and the hook groove 19 are in a hooking state. At this time, the locking block 17 is completely disengaged from the hook groove 9. The locking component 11 is located on the side of the through slide 3 away from the toothed part 4 and can slide downward along the through slide 3 to the bottom of the through slide 3. When the bottom surface of the locking block 12... When the locking block 12 contacts the top surface of the lower guide block 7, it rotates toward the toothed part 4, that is, the locking block 12 moves closer to the toothed part 4 until the locking block 17 on the locking block 12 enters the lowest slot 9 of the toothed part 4. Because the locking block 12 is close to the toothed part 4, the hook part 14 moves away from the locking block 12 until the hook part 14 leaves the hook groove 19. At this time, the hook part 14 is disengaged from the hook groove 19. It should be noted that the bottom surface of the upper guide block 6 extends obliquely upward and is higher than the toothed part 8, that is, the locking part 12 moves away from the toothed part 4 until the hook part 14 leaves the hook groove 19. When the fixed block 12 slides along the bottom surface of the hook tooth 8, the bottom surface of the hook tooth 8 will not force the hook part 14 into the hook groove 19. However, since the bottom surface of the upper guide block 6 is longer, when the locking block 12 slides along the bottom surface of the upper guide block 6, it can press its own hook groove 19 closer to the hook part 14 until the hook part 14 enters the hook groove 19. Similarly, the top surface of the lower guide block 7 extends obliquely upward and is higher than the hook tooth 8, ensuring that when the locking block 12 slides along the top surface of the lower guide block 7, the hook part 14 can disengage from the hook groove 19. Understandably, during the adjustment process, when the sliding seat 10 slides upward to the top of the support body 2, the hook part 14 engages with the hook groove 19. At this time, the locking component 11 completely avoids the hook tooth part 4, that is, the sliding seat 10 can slide freely through the sliding groove 3. When the sliding seat 10 slides downward to the top of the support body 2, the hook part 14 disengages from the hook groove 19, and the locking block 17 on the locking block 12 enters the locking groove 9... This cycle repeats. During the above process, there is no need to move the locking block 12. The user can adjust the height of the sliding seat 10 with just one hand.In this embodiment, the angle between the top surface of the hanging tooth 8 and the adjacent substrate 5 is no greater than 90 degrees. As long as the angle is no greater than 90 degrees, the locking block 17 will not slide off the slot on its own. In actual production, the angle is selected according to the situation and is not limited here.

[0027] Locking block 12 and latching block 17 are integrally molded and both are made of hard plastic. The outer surface of latching block 17 is covered with a flexible rubber layer. Specifically, latching block 17 is a one-time injection molded hard plastic. On this basis, a flexible rubber layer is formed on its surface by a second injection molding. The flexible rubber layer and latching block 17 are integrated.

[0028] In actual operation, when the locking block 17 enters the corresponding slot 9, the elastic part 16 tends to drive the locking block 17 into the slot 9. By providing a flexible rubber layer, the noise when the locking block 17 collides with the slot 9 is reduced. In addition, when the user's back twists during actual use of the seat, the sliding seat 10 will swing left and right. At this time, the locking block 17 and the slot 9 will also make noise. The flexible rubber layer on the outer surface of the locking block 17 can not only reduce noise, but also provide cushioning between the sliding seat 10 and the locking block 12.

[0029] Two locking blocks 17 are spaced apart on the end face of the locking block 12 facing the hanging tooth 8, and a locking groove 18 is formed between the two locking blocks 17. The locking groove 18 is adapted to the hanging tooth 8. The top surface of one locking block 17 is on the same plane as the top surface of the locking block 12, and the other locking block 17 is located on the end face of the locking block 12 facing the hanging tooth 8. By setting two locking blocks 17, the locking block 12 and the hanging tooth part 4 are doubly fixed. By setting the top surface of one locking block 17 to be on the same plane as the top surface of the locking block 12, that is, the top surface of the locking block 17 and the top surface of the locking block 12 have the same inclination angle, it is convenient to pull the sliding seat 10 upward. In this embodiment, the bottom surface of the hanging tooth 8, the top surface of the locking block 12, the bottom surface of the upper guide block 6, and the top surface of the lower guide block 7 all have the same inclination angle, and the spacing between the multiple hanging teeth 8 is the same. This facilitates the hanging teeth 8 entering the locking groove 18. A groove is formed between the lower guide block 7 and the base plate 5 to match the lower end of the locking block 12, and the top of the lower guide block 7 matches the hook groove 19. By setting the groove, the stability of the locking block 12 when it is located in the through groove 3 is improved.

[0030] The elastic element 13 also includes a connecting portion 15. The elastic portion 16 is connected to the top end of the connecting portion 15 and abuts against the end face of the locking block 12 away from the hanging tooth 8. The hook portion 14 is connected to the lower end of the connecting portion 15 and extends toward the hook groove 19. The hook portion 14 is elastic. In this embodiment, the elastic element 13 is formed by bending an elastic steel sheet. Specifically, the elastic steel sheet is bent into a first segment, a second segment, and a third segment. An upward protrusion 29 is also bent out on the third segment. The first segment is the elastic portion 16, the second segment is the connecting portion 15, and the third segment is the hook portion 14. The upward protrusion 29 on the third segment is adapted to the hook groove 19. Further, after the first, second, and third segments are bent, they are roughly in a non-closed triangular shape (the opening is located between the first and third segments). The elastic portion 16 is inclined from top to bottom toward the hanging tooth 4, and the connecting portion 15 is inclined from bottom to top toward the hanging tooth 4. Steel sheets have the advantages of high strength, good elasticity, and long service life. Furthermore, steel sheets are easy to process and have low cost. In summary, the elastic element 16 in this application can be manufactured simply by bending a steel sheet, significantly reducing the manufacturing cost of the elastic element 16 and facilitating its widespread adoption. During actual installation, the elastic element 13 is installed on the sliding seat 10 via the first hook 25 and the second hook 26 set on the sliding seat 10. Specifically, the connection between the first and second sections hooks onto the first hook 25, and the connection between the second and third sections hooks onto the second hook 26. The protrusion 29 on the third section is adapted to the hook groove 19. Through the elasticity of the third section, the protrusion 29 can enter / exit the hook groove 19. During installation, it is only necessary to align the elastic element 13 with the first hook 25 and the second hook 26, and then snap the two bent parts of the elastic element 13 onto the first hook 25 and the second hook 26 respectively. The operation is simple. The sliding seat 10 also has a top block 28, which is located on the rear side of the second section. The top block 28 provides support for the elastic element 13 and ensures that the elastic element 13 does not wobble when it is working. Understandably, when the hook part 14 and the hook groove 19 are in the hooked state, the elastic force of the elastic part 16 on the locking block 12 will not cause the protrusion 29 on the hook part 14 to disengage from the hook groove 19 on its own.

[0031] The sliding seat 10 includes a first housing 20 and a second housing 21 that are detachably connected. The first housing 20 is located on the front side of the support body 2, and the seat back is connected to the front end face of the support body 2. The second housing 21 is located on the rear side of the support body 2, and the second housing 21 has a cavity 22 that matches the support body 2. The lower end of the support body 2 is connected to a seat support 23, and the seat plate is detachably connected to the top surface of the seat support 23. In actual assembly, firstly, the locking block 12 is installed on the bottom surface of the cavity 22 corresponding to the through groove 3 via the pivot 24; secondly, the elastic element 13 is installed on the bottom surface of the cavity 22 corresponding to the through groove 3 via the first hanging rod 25 and the second hanging rod 26; then, the second housing 21 is fastened onto the support body 2, and the locking block 12 is aligned with the hanging tooth part 4; finally, the first housing 20 is connected to the second housing 21. In this embodiment, both the first housing 20 and the second housing have shaft holes 30 corresponding to the pivot 24, and the locking block 12 is installed on the sliding seat 10 through the shaft holes 30. By setting the shaft hole 30, the stability of the rotating shaft 24 installation is increased, while the installation difficulty is reduced. It should be noted that after the first housing 20 is connected to the second housing 21, the cavities 22 of the first housing 20 and the second housing 21 form a through channel 27. The support body 2 is located within the through channel 27, and the sliding seat 10 can slide on the support body 2 through the through channel 27. When the sliding seat 10 slides on the support body 2, it drives the rotating shaft 24 to slide synchronously, that is, the sliding seat 10 drives the locking block 12 to slide. In this embodiment, the shaft hole 30 is a through hole. It can be understood that the shaft hole 30 can be a through hole or a blind hole; the appropriate type of shaft hole 30 is selected according to actual needs.

[0032] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A backrest lifting self-circulating adjustment device, characterized in that, include: A support body is vertically arranged. A through groove is provided in the middle of the support body along the vertical direction. A hanging tooth part is provided on one of the vertical side walls of the through groove. The hanging tooth part includes a vertically arranged base plate, an upper guide block and a lower guide block spaced apart on the surface of the base plate, and multiple hanging teeth are provided on the surface of the base plate along its own length direction. The multiple hanging teeth are spaced apart and located between the upper guide block and the lower guide block. The angle between the top surface of the hanging tooth and the adjacent base plate surface is not greater than 90 degrees. The bottom surface of the hanging tooth extends obliquely upward. A groove is formed between two adjacent hanging teeth. The bottom surface of the upper guide block extends obliquely upward and is higher than the hanging teeth. The top surface of the lower guide block extends obliquely upward and is higher than the hanging teeth. A sliding seat is used to install a seat backrest. The sliding seat is sleeved on the support body and can slide up and down along the support body. A locking component is provided on the inner side wall of the sliding seat. The locking component is located in the through-slide groove. The locking component includes a locking block rotatably disposed on the sliding seat and an elastic element fixedly disposed on the sliding seat. The top and bottom surfaces of the locking block extend obliquely upward. Several locking blocks are provided on the end face of the locking block facing the hanging teeth. The locking block and the locking blocks are integrally formed and are both made of hard plastic. The outer surface of the locking blocks is covered with a flexible rubber layer. The locking blocks are adapted to the slot. The locking block and the hanging teeth have a locked state and an unlocked state. When the locking block is inserted into the slot, it is in the locked state. At this time, the sliding seat is fixed in the slot. When the locking block is disengaged from the slot, it is in the unlocked state. At this time, the sliding seat can slide up and down along the through-slide groove. The elastic element includes a hook portion and an elastic portion for driving the locking block toward the hook teeth. The locking block has a hook groove adapted to the hook portion. The elastic element also includes a connecting portion. The elastic portion is connected to the top end of the connecting portion and abuts against the end face of the locking block away from the hook teeth. The hook portion is connected to the lower end of the connecting portion and extends toward the hook groove. The hook portion is elastic. The elastic element is formed by bending an elastic steel sheet. The hook portion has an upward protrusion bent on it, and the protrusion is adapted to the hook groove. The elastic steel sheet is bent into a first segment, a second segment, and a third segment. The first segment is the elastic portion, the second segment is the connecting portion, and the third segment is the hook portion. The sliding seat has a first hook rod and a second hook rod. The connection between the first segment and the second segment is hooked onto the first hook rod, and the connection between the second segment and the third segment is hooked onto the second hook rod. The hooking part and the hook groove have a hooked state and a disengaged state. When it is in the hooked state, part of the hooking part is inserted into the hook groove, and at this time the locking block is released from the hanging tooth part. When it is in the disengaged state, the hooking part is disengaged from the hook groove and there is a gap between the hooking part and the hook groove. At this time, the locking block is inserted into the hanging tooth part under the action of the elastic part.

2. The backrest lifting self-circulating adjustment device according to claim 1, characterized in that, The locking block has two locking blocks spaced apart on its end face facing the hanging tooth, and a locking groove is formed between the two locking blocks, which is adapted to the hanging tooth.

3. The backrest lifting self-circulating adjustment device according to claim 2, characterized in that, One of the card blocks has its top surface on the same plane as the top surface of the locking block, and the other card block is located on the end face of the locking block facing the gear.

4. The backrest lifting self-circulating adjustment device according to claim 1, characterized in that, The bottom surface of the hook tooth and the top surface of the locking block are inclined at the same angle, and the bottom surface of the upper guide block and the top surface of the lower guide block are inclined at the same angle.

5. The backrest lifting self-circulating adjustment device according to claim 1, characterized in that, A groove is formed between the lower guide block and the substrate to match the lower end of the locking block, and the top end of the lower guide block matches the hook groove.

6. The backrest lifting self-circulating adjustment device according to claim 1, characterized in that, The spacing between the multiple teeth is consistent.

7. The backrest lifting self-circulating adjustment device according to claim 1, characterized in that, The sliding seat includes a first housing and a second housing that are detachably connected. The first housing is located on the front side of the support body, and the seat back is connected to the front end face of the support body. The second housing is located on the rear side of the support body and has a cavity that is adapted to the support body. The lower end of the support body is connected to a seat support body, and the seat plate of the seat is detachably connected to the top surface of the seat support body.

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