Backrest lifting adjustment mechanism and office chair

Abstract

The utility model provides a backrest lifting adjusting mechanism and office chair, backrest lifting adjusting mechanism includes: seat, be provided with lifting adjusting groove on the seat, the both sides of lifting adjusting groove all are provided with a plurality of from top to bottom arranged in order ratchet groove, the upper end of lifting adjusting groove is provided with the close guide part, the lower end of lifting adjusting groove is provided with the open guide part, backrest, backrest is liftable and is arranged on the seat, sliding adjusting part, sliding adjusting part includes the compression spring and two pawls, two pawls are provided with first clamping portion and second clamping portion. Relative to the prior art, the backrest lifting adjusting mechanism of the utility model can actively adjust the height of the backrest according to its own needs, thereby adapting to users of different body types, also realizing adaptation to different needs of users, improving comfort, enabling users to obtain a better experience when sitting on the office chair; the overall structure is stable and cleverly designed, and height adjustment operation is also relatively convenient.

Description

Technical Field

[0001] This utility model relates to the field of office chair technology, specifically to a backrest lifting and adjusting mechanism and an office chair. Background Technology

[0002] Office chairs refer to various types of chairs provided for convenience during daily work and social activities. Since sitting in office chairs for extended periods can easily lead to many adverse health effects, and significantly increases the risk of cervical spondylosis, headrests are typically included in these chairs to facilitate rest and relaxation for office workers.

[0003] Office chairs typically consist of a base, seat, backrest, backrest, and headrest. The base usually has multiple casters to facilitate the movement of the office chair. The seat is fixed to the base for the user to sit on. The backrest is located at the back of the seat, the backrest is installed on the seat to support the user's back, and the headrest is installed on the backrest to support the user's head.

[0004] In current office chairs, the backrest is usually fixed to the seat, and users cannot actively adjust the height of the backrest according to their own body shape, resulting in poor adaptability. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings and deficiencies in the existing technology and to provide a backrest lifting and adjustment mechanism and an office chair.

[0006] One embodiment of this utility model provides a backrest lifting adjustment mechanism, comprising: The chair seat is provided with a height adjustment groove. Both sides of the height adjustment groove are provided with multiple ratchet grooves arranged sequentially from top to bottom. The upper end of the height adjustment groove is provided with a closing guide part, and the lower end of the height adjustment groove is provided with an opening guide part. A backrest, which is height-adjustable and mounted on the seat; A sliding adjustment component includes a clamping elastic element and two pawls. The two pawls are provided with a first engaging portion and a second engaging portion. The pawls are rotatably mounted on the backrest. The clamping elastic element is connected to the two pawls respectively. When the two pawls approach each other, the pawls squeeze or stretch the clamping elastic element to cause the clamping elastic element to undergo elastic deformation. The elastic force of the clamping elastic element is directed towards the ratchet groove. The pawl and the ratchet groove are positioned and engaged so that the backrest can only rise relative to the seat; When the two pawls move upward to the closing guide, the closing guide guides the two pawls to move closer to each other to disengage from the ratchet groove, and the first locking part and the second locking part engage to restrict the two pawls from opening. When the two pawls move downwards to the opening guide, the opening guide guides the two pawls to unfold.

[0007] In some alternative embodiments, the opening guide includes two guide slopes that gradually move away from each other from top to bottom.

[0008] In some alternative embodiments, the merging guide portion includes two guide straight portions arranged side by side.

[0009] In some alternative embodiments, the first snap-fit ​​portion is a slot, and the second snap-fit ​​portion is a snap-fit ​​member, wherein the snap-fit ​​member snaps into the slot to achieve a snap-fit ​​engagement between the first snap-fit ​​portion and the second snap-fit ​​portion.

[0010] In some optional embodiments, the snap-fit ​​component includes a connecting structure and a cylindrical structure disposed at the end of the connecting structure. The snap-fit ​​groove is a C-shaped groove, the opening of which is smaller than the diameter of the cylindrical structure. The cylindrical structure snaps into the C-shaped groove to achieve a snap-fit ​​engagement between the first snap-fit ​​portion and the second snap-fit ​​portion.

[0011] In some alternative embodiments, the clamping elastic element is a torsion spring, with its two ends respectively connected to the two pawls.

[0012] In some alternative embodiments, the seat is provided with a lifting slide rail, and the backrest is provided with a sliding guide structure, which slides in conjunction with the lifting slide rail.

[0013] In some alternative embodiments, the lifting slide rail includes a plurality of sliding slots, and the sliding guide structure includes a plurality of sliding limit members, a portion of which passes through the sliding slot from the side of the sliding slot away from the backrest and is then detachably connected to the backrest so that the backrest is restricted to the seat, and the sliding limit member slides in engagement with the sliding slot.

[0014] In some alternative embodiments, the lifting slide rail includes a plurality of convex rails that protrude from the side of the seat facing the backrest, and the sliding guide structure includes a plurality of sliding grooves that are disposed on the side of the backrest facing the seat, with the convex rails corresponding to and slidingly engaging with the sliding grooves.

[0015] Another embodiment of this utility model provides an office chair, including: a backrest lifting and adjusting mechanism as described above.

[0016] Compared to existing technologies, the backrest height adjustment mechanism of this utility model can actively adjust the backrest height according to its own needs, thereby adapting to users of different body types and meeting different user needs, improving comfort, and enabling users to have a better experience when sitting in an office chair; the overall structure is stable and ingeniously designed, and the height adjustment operation is also relatively convenient.

[0017] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the backrest lifting adjustment mechanism according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a backrest lifting adjustment mechanism according to an embodiment of the present invention; Figure 3 for Figure 2 The enlarged view at point A is shown below; Figure 4 A schematic diagram of the structure of a chair seat according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a sliding adjustment component according to an embodiment of the present invention; Figure 6 This is an exploded view of the back of one embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 10. Seat; 11. Height adjustment groove; 111. Rattle groove; 112. Closing guide; 1121. Straight guide; 113. Opening guide; 1131. Inclined guide; 12. Height rail; 121. Sliding through groove; 122. Raised rail; 20. Backrest; 21. Sliding guide structure; 211. Sliding limiter; 212. Sliding groove; 30. Sliding adjustment component; 31. Pawl; 32. First locking part; 33. Second locking part; 331. Connecting structure; 332. Cylindrical structure. Detailed Implementation

[0020] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof. Please refer to... Figure 1 One embodiment of this utility model provides a backrest lifting adjustment mechanism, comprising: The chair seat 10 is provided with a lifting adjustment groove 11. Both sides of the lifting adjustment groove 11 are provided with multiple ratchet grooves 111 arranged from top to bottom. The upper end of the lifting adjustment groove 11 is provided with a closing guide part 112, and the lower end of the lifting adjustment groove 11 is provided with an opening guide part 113. Backrest 20 is height-adjustable and mounted on seat 10; The sliding adjustment member 30 includes a clamping elastic member and two pawls 31. The two pawls 31 are provided with a first locking part 32 and a second locking part 33. The pawls 31 are rotatably mounted on the backrest 20. The clamping elastic member is connected to the two pawls 31 respectively. When the two pawls 31 approach each other, the pawls 31 squeeze or stretch the clamping elastic member to make the clamping elastic member produce elastic deformation. The elastic force of the clamping elastic member is directed towards the ratchet groove 111.

[0021] The working principle of the backrest lifting adjustment mechanism according to one embodiment of this utility model is explained below: Taking the initial state where the pawl 31 is engaged with the ratchet groove 111 as an example, the pawl 31 and the ratchet groove 111 are positioned and engaged. At this time, the backrest 20 can only rise relative to the seat 10 and cannot move downwards, thereby realizing the adjustment of the height position of the backrest 20. Since the backrest 20 will not move downwards, the weight of the backrest 20 will drive the pawl 31 to press against the ratchet groove 111. With the elastic force of the clamping elastic element, the pawl 31 is pressed into the ratchet groove 111, so that the pawl 31 and the ratchet groove 111 can stably engage and position the backrest 20. If the backrest 20 needs to be adjusted upward relative to the seat 10, force is applied to lift the backrest 20. At this time, the two pawls 31 will be guided by the ratchet groove 111 to move closer to each other until the pawl 31 crosses the current ratchet groove 111. After reaching the adjacent ratchet groove 111 above, the elastic force of the pressing elastic element will drive the pawl 31 to press again into the adjacent ratchet groove 111 above, thereby adjusting the height by one level.

[0022] When it is necessary to adjust the backrest 20 downwards, it needs to be moved upwards along the lifting adjustment groove 11 to the highest point of its travel. During the upward movement, when the two pawls 31 move upwards to the closing guide part 112, the closing guide part 112 will guide the two pawls 31 to move closer to each other so that the pawls 31 disengage from the ratchet groove 111. The first locking part 32 and the second locking part 33 engage to restrict the opening of the two pawls 31. At this time, the pawls 31 will not open under the elastic force of the clamping elastic element because they are restricted. Therefore, the pawls 31 will not engage with the ratchet groove 111. At this time, the pawls 31 of the backrest 20 can descend along the lifting adjustment groove 11, so that the backrest 20 can also descend. When the backrest 20 moves downwards to the highest point of its travel, it will be adjusted downwards. When approaching the lowest point of the travel range, the two pawls 31 will move downwards to the opening guide 113. At this time, the opening guide 113 guides the two pawls 31 away from each other, causing the two pawls 31 to unfold. After the two pawls 31 unfold, the first locking part 32 and the second locking part 33 separate from each other, releasing the restriction on the pawls 31. At this time, the backrest 20 rises again, while the pawls 31 rise along the lifting adjustment groove 11. After the pawls 31 reach the lowest ratchet groove 111, the two pawls 31 can enter the two ratchet grooves 111 under the drive of the clamping elastic element, realizing the limiting engagement of the pawls 31 and the ratchet groove 111. Then the backrest 20 is moved upwards to the position to be adjusted.

[0023] Since the backrest 20 can be adjusted upwards in stages, when the position to be adjusted is lower than the current position, the seat 10 needs to be raised to the highest position, then back to the lowest position, and finally raised to the position to be adjusted.

[0024] The specific structure of the opening guide 113 can be designed according to actual needs. For example, in some optional embodiments, the opening guide 113 includes two guide slopes 1131. The two guide slopes 1131 gradually move away from each other from top to bottom. When the backrest 20 moves downward, the pawl 31 contacts the guide slope 1131 and is then gradually rotated by the guide slope 1131, so that the two pawls 31 move away from each other.

[0025] In some alternative embodiments, the closing guide portion 112 includes two guide straight portions 1121 arranged side by side. When the backrest 20 moves upward, the pawl 31 contacts the guide straight portion 1121 and is then guided to rotate by the guide straight portion 1121, so that the two pawls 31 move closer to each other until the two pawls 31 can move closer to each other until the first locking portion 32 and the second locking portion 33 engage. In this embodiment, the two guide straight portions 1121 are parallel to each other.

[0026] The specific structure of the first latching portion 32 and the second latching portion 33 can be designed according to actual needs. For example, in some optional embodiments, the first latching portion 32 is a latching slot, and the second latching portion 33 is a latching member. The latching member is inserted into the latching slot to achieve the latching engagement of the first latching portion 32 and the second latching portion 33. Of course, other suitable structures can also be adopted for the first latching portion 32 and the second latching portion 33, and this example is not limited to them.

[0027] In some optional embodiments, the snap-fit ​​component includes a connecting structure 331 and a cylindrical structure 332 disposed at the end of the connecting structure 331. The snap-fit ​​groove is a C-shaped groove, the opening of which is smaller than the diameter of the cylindrical structure 332. The cylindrical structure 332 snaps into the C-shaped groove to achieve a snap-fit ​​engagement between the first snap-fit ​​portion 32 and the second snap-fit ​​portion 33. The cylindrical structure 332 can enter the C-shaped groove more smoothly, reducing friction during the snap-fit ​​process and making the snap-fit ​​and unsnap-fit ​​processes smoother.

[0028] The specific structure of the clamping elastic element can be designed according to actual needs. For example, in some optional embodiments, the clamping elastic element is a torsion spring, with its two ends connected to two pawls 31 respectively. In this embodiment, a mounting shaft is provided on the backrest 20, the torsion spring is sleeved on the mounting shaft, and both pawls 31 are rotatably engaged with the mounting shaft.

[0029] In some alternative embodiments, the seat 10 is provided with a lifting slide rail 12, and the backrest 20 is provided with a sliding guide structure 21. The sliding guide structure 21 slides in cooperation with the lifting slide rail 12, thereby improving the lifting stability of the backrest 20.

[0030] The specific structure of the lifting slide rail 12 can be designed according to actual needs. For example, in some optional embodiments, the lifting slide rail 12 includes multiple sliding grooves 121, and the sliding guide structure 21 includes multiple sliding limiting members 211. Parts of the sliding limiting members 211 pass through the sliding groove 121 from the side away from the backrest 20, and are then detachably connected to the backrest 20, so that the backrest 20 is restricted to the seat 10. The sliding limiting members 211 are slidably engaged with the sliding groove 121. In this embodiment, the sliding limiting members 211 are provided with screws. The screws pass through the sliding groove 121 from the side away from the backrest 20, and are then threadedly engaged with the backrest 20, thereby restricting the backrest 20 to the seat 10, so that the backrest 20 can only be raised and lowered relative to the sliding groove 121.

[0031] In some alternative embodiments, the lifting slide rail 12 includes a plurality of protruding rails 122 protruding from the side of the seat facing the backrest 20, and the sliding guide structure 21 includes a plurality of sliding grooves 212 disposed on the side of the backrest 20 facing the seat 10. The protruding rails 122 slide in cooperation with the sliding grooves 212, thereby improving the stability of the backrest 20 relative to the seat 10 during lifting.

[0032] The aforementioned backrest height adjustment mechanism can be applied to office chairs, which include: the aforementioned backrest height adjustment mechanism.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backrest lifting adjustment mechanism, characterized in that, include: The chair seat is provided with a height adjustment groove. Both sides of the height adjustment groove are provided with multiple ratchet grooves arranged sequentially from top to bottom. The upper end of the height adjustment groove is provided with a closing guide part, and the lower end of the height adjustment groove is provided with an opening guide part. A backrest, which is height-adjustable and mounted on the seat; A sliding adjustment component includes a clamping elastic element and two pawls. The two pawls are provided with a first engaging portion and a second engaging portion. The pawls are rotatably mounted on the backrest. The clamping elastic element is connected to the two pawls respectively. When the two pawls approach each other, the pawls squeeze or stretch the clamping elastic element to cause the clamping elastic element to undergo elastic deformation. The elastic force of the clamping elastic element is directed towards the ratchet groove. The pawl and the ratchet groove are positioned and engaged so that the backrest can only rise relative to the seat; When the two pawls move upward to the closing guide, the closing guide guides the two pawls to move closer to each other to disengage from the ratchet groove, and the first locking part and the second locking part engage to restrict the two pawls from opening. When the two pawls move downwards to the opening guide, the opening guide guides the two pawls to unfold.

2. The backrest lifting adjustment mechanism according to claim 1, characterized in that: The opening guide includes two guide slopes that gradually move away from each other from top to bottom.

3. The backrest lifting adjustment mechanism according to claim 1, characterized in that: The closing guide section includes two guide sections, which are arranged side by side.

4. The backrest lifting adjustment mechanism according to claim 1, characterized in that: The first snap-fit ​​part is a slot, and the second snap-fit ​​part is a snap-fit ​​component. The snap-fit ​​component is snapped into the slot to achieve a snap-fit ​​engagement between the first snap-fit ​​part and the second snap-fit ​​part.

5. The backrest lifting adjustment mechanism according to claim 4, characterized in that: The snap-fit ​​component includes a connecting structure and a cylindrical structure disposed at the end of the connecting structure. The snap-fit ​​groove is a C-shaped snap-fit ​​groove, and the opening of the C-shaped snap-fit ​​groove is smaller than the diameter of the cylindrical structure. The cylindrical structure is snapped into the C-shaped snap-fit ​​groove to achieve snap-fit ​​engagement between the first snap-fit ​​part and the second snap-fit ​​part.

6. A backrest lifting adjustment mechanism according to any one of claims 1 to 5, characterized in that: The clamping elastic element is a torsion spring, with its two ends connected to the two pawls respectively.

7. A backrest lifting adjustment mechanism according to any one of claims 1 to 5, characterized in that: The chair seat is provided with a lifting slide rail, and the backrest is provided with a sliding guide structure, which slides in cooperation with the lifting slide rail.

8. The backrest lifting adjustment mechanism according to claim 7, characterized in that: The lifting slide rail includes multiple sliding slots, and the sliding guide structure includes multiple sliding limiting members. A portion of the sliding limiting member passes through the sliding slot from the side away from the backrest and is then detachably connected to the backrest so that the backrest is restricted to the seat. The sliding limiting member slides in conjunction with the sliding slot.

9. A backrest lifting adjustment mechanism according to claim 7, characterized in that: The lifting slide rail includes multiple convex rails that protrude from the side of the seat facing the backrest. The sliding guide structure includes multiple sliding grooves that are disposed on the side of the backrest facing the seat. The convex rails slide in cooperation with the sliding grooves.

10. An office chair, characterized in that, include: A backrest lifting adjustment mechanism as described in any one of claims 1 to 9.

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