Seat waist-reclining mechanism and office chair

Abstract

The utility model provides a kind of seat waist rest rebound lifting mechanism and office chair, seat waist rest rebound lifting mechanism includes: backrest, waist rest, lifting adjusting structure and rebound structure;Lifting adjusting structure includes lifting adjusting seat, and waist rest is set on backrest by lifting adjusting seat and can be lifted and descended;Rebound structure includes rebound elastic piece, first guide pillar being set on lifting adjusting seat and first guide sleeve being set on the rear side of waist rest, first guide sleeve is movably sleeved in the outside of first guide pillar, and can move back and forth relative to first guide pillar, and rebound elastic piece is set between lifting adjusting seat and waist rest.The utility model can actively adjust the height of waist rest, thereby adapting the size of user, after user sits down, passive type buffering can also be realized by rebound structure, and the position can also be adjusted adaptively to make waist rest adapt to the size of user, overall structure is simple, and adjustment operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of office chair technology, specifically to a lumbar support rebound lifting 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, backrest, backrest, and headrest. The base usually has multiple casters to facilitate the movement of the office chair. The backrest is fixed to the base for the user to sit on, while the backrest is located behind the backrest and is installed on the backrest to support the user's back. The headrest is installed on the backrest to support the user's head.

[0004] Currently, some office chairs have lumbar support structures on the backrest. However, these lumbar supports are fixed and can only adapt to the user's waist shape through soft cushions. Users cannot actively adjust the height of the backrest according to their own body shape or achieve a wider range of forward and backward rebound, 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 seat lumbar support rebound lifting mechanism and an office chair.

[0006] One embodiment of the present invention provides a seat lumbar support rebound lifting mechanism, including: a backrest, a lumbar support, a lifting adjustment structure and a rebound structure;

[0007] The lifting and adjusting structure includes a lifting and adjusting seat, and the lumbar support is flexibly and adjustablely mounted on the backrest via the lifting and adjusting seat;

[0008] The rebound structure includes a rebound elastic element, a first guide post disposed on the lifting adjustment seat, and a first guide sleeve disposed on the rear side of the lumbar support. The first guide sleeve is movably sleeved on the outside of the first guide post and can move back and forth relative to the first guide post. The rebound elastic element is disposed between the lifting adjustment seat and the lumbar support.

[0009] In some optional embodiments, the first guide post is provided with a guide groove, and a plurality of second guide posts are provided in the guide groove;

[0010] The first guide sleeve is provided with a plurality of second guide sleeves, which are sleeved on the outside of the second guide post and slide in cooperation with the second guide post.

[0011] In some alternative embodiments, the rebound elastic element includes a plurality of rebound springs, which are correspondingly sleeved on the outside of the second guide post and abut against the end of the second guide sleeve.

[0012] In some optional embodiments, the second guide post is provided with a spring-loaded locking member, the inner wall of the second guide sleeve is provided with a limiting ring, the spring-loaded locking member is arranged inside the second guide sleeve, and the spring-loaded locking member is limited and engaged with the limiting ring.

[0013] In some optional embodiments, the outer side of the first guide post is provided with a plurality of spring-rebound guide grooves, and the inner side of the first guide sleeve is provided with a plurality of spring-rebound guide protrusions, wherein the spring-rebound guide grooves are slidably engaged with the spring-rebound guide protrusions.

[0014] In some optional embodiments, the lifting adjustment structure further includes a lifting adjustment groove and a sliding adjustment component. The lifting adjustment groove is disposed on the backrest. Both sides of the lifting adjustment groove are provided with multiple ratchet grooves arranged sequentially from top to bottom. The upper end of the lifting adjustment groove is provided with a closing guide part, and the lower end of the lifting adjustment groove is provided with an opening guide part.

[0015] The sliding adjustment component includes a clamping elastic element and two pawls. The two pawls are provided with a first locking part and a second locking part. The pawls are rotatably mounted on the lifting adjustment seat. 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 produce elastic deformation. The elastic force of the clamping elastic element is directed towards the ratchet groove.

[0016] The pawl and the ratchet groove are positioned and engaged so that the lifting adjustment seat can only rise relative to the backrest;

[0017] 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.

[0018] When the two pawls move downwards to the opening guide, the opening guide guides the two pawls to unfold.

[0019] In some alternative embodiments, the opening guide includes two guide slopes that gradually move away from each other from top to bottom.

[0020] In some alternative embodiments, the merging guide portion includes two guide straight portions arranged side by side.

[0021] 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.

[0022] Another embodiment of this utility model provides an office chair, including: a lumbar support rebound lifting mechanism as described above.

[0023] Compared with existing technologies, the seat lumbar support rebound lifting mechanism of this utility model can actively adjust the height of the lumbar support to adapt to the user's body shape. After the user sits down, the rebound structure can also achieve passive cushioning. Moreover, the position can be adjusted forward and backward to make the lumbar support fit the user's body shape. The overall structure is simple and the adjustment operation is convenient.

[0024] 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

[0025] Figure 1 This is a schematic diagram of one side of the seat lumbar support rebound lifting mechanism according to an embodiment of the present invention;

[0026] Figure 2 This is an exploded view of the seat lumbar support rebound lifting mechanism according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of a lifting adjustment seat according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the lumbar support structure according to one embodiment of the present invention;

[0029] Figure 5 This is a partial cross-sectional view of the lumbar support and height adjustment seat according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the back-to-back structure of one embodiment of the present utility model;

[0031] Figure 7 for Figure 6 The enlarged view of point A shown.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Backrest; 20. Lumbar support; 30. Lifting and adjusting structure; 31. Lifting and adjusting seat; 32. Lifting and adjusting groove; 321. Racket groove; 322. Closing guide; 3221. Guide straight part; 323. Opening guide; 3231. Guide inclined part; 33. Sliding adjusting part; 331. Pawl; 332. First locking part; 333. Second locking part; 40. Springback structure; 41. Springback elastic element; 411. Springback spring; 42. First guide post; 421. Guide groove; 422. Second guide post; 423. Springback locking element; 424. Springback guide groove; 43. First guide sleeve; 431. Second guide sleeve; 432. Limiting ring; 433. Springback guide protrusion. Detailed Implementation

[0034] 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... Figures 1 to 5 One embodiment of this utility model provides a seat lumbar support rebound lifting mechanism, including: a backrest 10, a lumbar support 20, a lifting adjustment structure 30 and a rebound structure 40;

[0035] The lifting and adjusting structure 30 includes a lifting and adjusting seat 31, and the lumbar support 20 is flexibly and adjustablely mounted on the backrest 10 via the lifting and adjusting seat 31;

[0036] The rebound structure 40 includes a rebound elastic element 41, a first guide post 42 disposed on the lifting adjustment seat 31, and a first guide sleeve 43 disposed on the rear side of the lumbar support 20. The first guide sleeve 43 is movably sleeved on the outside of the first guide post 42 and can move back and forth relative to the first guide post 42. The rebound elastic element 41 is disposed between the lifting adjustment seat 31 and the lumbar support 20.

[0037] The working principle of the seat lumbar support rebound lifting mechanism according to one embodiment of this utility model is explained below:

[0038] The lumbar support 20 can be height adjusted relative to the backrest 10 through the lifting adjustment seat 31 of the lifting adjustment structure 30, so that the position of the lumbar support 20 can be actively adjusted relative to the user's waist, thereby improving the user's comfort.

[0039] After the user sits in the office chair, the user's lower back presses against the lumbar support 20. Under the user's weight, the first guide sleeve 43 moves backward relative to the first guide post 42, so that the lumbar support 20 can adaptively move backward to adjust its position. At this time, the rebound elastic element 41 will produce elastic deformation. The elastic force of the rebound elastic element 41 drives the lumbar support 20 to press against the user's lower back, so that the lumbar support 20 keeps against the user's lower back, thereby providing support for the user's lower back.

[0040] The first guide sleeve 43 and the first guide post 42 cooperate to improve the movement stability of the lumbar support 20 relative to the lifting adjustment seat 31.

[0041] In some optional embodiments, a guide groove 421 is provided on the first guide post 42, and a plurality of second guide posts 422 are provided in the guide groove 421; a plurality of second guide sleeves 431 are provided in the first guide sleeve 43, and the second guide sleeves 431 are sleeved on the outside of the second guide post 422 and slide in cooperation with the second guide post 422. The cooperation between the second guide sleeves 431 and the second guide post 422 increases the support position between the first guide post 42 and the first guide sleeve 43, which helps to improve the stability of the relative sliding of the first guide post 42 and the first guide sleeve 43.

[0042] The specific structure of the rebound elastic element 41 can be designed according to actual needs. For example, in some optional embodiments, the rebound elastic element 41 includes multiple rebound springs 411. The rebound springs 411 are correspondingly sleeved on the outside of the second guide post 422 and abut against the end of the second guide sleeve 431. When the lumbar support 20 moves backward toward the lifting adjustment seat 31, the second guide post 422 will move along the second guide sleeve 431 and press against the rebound springs 411, causing the rebound springs 411 to undergo elastic deformation. Multiple rebound springs 411 can also improve the force stability of the lumbar support 20.

[0043] In some alternative embodiments, a spring-loaded locking member 423 is provided on the second guide post 422, and a limiting ring portion 432 is provided on the inner wall of the second guide sleeve 431. The spring-loaded locking member 423 is arranged inside the second guide sleeve 431, and the spring-loaded locking member 423 cooperates with the limiting ring portion 432 to limit a portion of the second guide post 422 inside the second guide sleeve 431, thereby locking the lumbar support 20 on the lifting adjustment seat 31 and preventing it from falling off.

[0044] In some optional embodiments, the outer side of the first guide post 42 is provided with a plurality of spring-rebound guide grooves 424, and the inner side of the first guide sleeve 43 is provided with a plurality of spring-rebound guide protrusions 433. The spring-rebound guide grooves 424 slide in cooperation with the spring-rebound guide protrusions 433, thereby improving the sliding cooperation between the first guide post 42 and the first guide sleeve 43 to be more stable and less prone to shaking.

[0045] Please see Figures 6 to 7In some optional embodiments, the lifting adjustment structure 30 further includes a lifting adjustment groove 32 and a sliding adjustment member 33. The lifting adjustment groove 32 is disposed on the backrest 10, and multiple ratchet grooves 321 arranged sequentially from top to bottom are provided on both sides of the lifting adjustment groove 32. A closing guide portion 322 is provided at the upper end of the lifting adjustment groove 32, and an opening guide portion 323 is provided at the lower end of the lifting adjustment groove 32. The sliding adjustment member 33 includes a clamping elastic member and two pawls 331. The 1 is provided with a first locking part 332 and a second locking part 333. The pawl 331 is rotatably mounted on the lifting adjustment seat 31. The clamping elastic element is connected to the two pawls 331 respectively. When the two pawls 331 approach each other, the pawl 331 squeezes or stretches the clamping elastic element to make the clamping elastic element produce elastic deformation. The elastic force of the clamping elastic element is directed towards the ratchet groove 321. The pawl 331 and the ratchet groove 321 are positioned and engaged so that the lifting adjustment seat 31 can only rise relative to the back of 10.

[0046] The working principle of the lifting adjustment structure 30 according to one embodiment of the present invention is explained below:

[0047] Taking the initial state where the pawl 331 and the ratchet groove 321 are engaged as an example, the pawl 331 and the ratchet groove 321 are positioned and engaged. At this time, the lifting adjustment seat 31 can only rise relative to the back of 10 and cannot move downward, thereby realizing the adjustment of the height position of the lifting adjustment seat 31. Since the lifting adjustment seat 31 will not move downward, the gravity of the lifting adjustment seat 31 will drive the pawl 331 to press against the ratchet groove 321. With the elastic force of the clamping elastic element, the pawl 331 is pressed into the ratchet groove 321, so that the pawl 331 and the ratchet groove 321 can stably engage and position the lifting adjustment seat 31. If the lifting adjustment seat 31 needs to be adjusted upward relative to the backrest 10, force is applied to lift the lifting adjustment seat 31. At this time, the two pawls 331 will be guided by the ratchet groove 321 to move closer to each other until the pawls 331 cross the current ratchet groove 321. After reaching the adjacent ratchet groove 321 above, the elastic force of the pressing elastic element will drive the pawls 331 to press again into the adjacent ratchet groove 321 above, thereby adjusting the height by one level.

[0048] When it is necessary to adjust the lifting adjustment seat 31 downwards, the lifting adjustment seat 31 needs to be moved upwards along the lifting adjustment groove 32 to the highest point of its stroke. During the upward movement, when the two pawls 331 move upwards to the closing guide part 322, the closing guide part 322 will guide the two pawls 331 to move closer to each other so that the pawls 331 disengage from the ratchet groove 321. The first locking part 332 and the second locking part 333 engage to restrict the opening of the two pawls 331. At this time, the pawls 331 will not open under the elastic force of the clamping elastic element because they are restricted. Therefore, the pawls 331 will not engage with the ratchet groove 321. At this time, the pawls 331 of the lifting adjustment seat 31 can descend along the lifting adjustment groove 32, so that the lifting adjustment seat 31 can also descend. When the lifting adjustment seat 31 moves downwards... When the device moves to the lowest point of its travel range, it will cause the two pawls 331 to move downwards to the opening guide 323. At this time, the opening guide 323 guides the two pawls 331 away from each other, causing the two pawls 331 to unfold. After the two pawls 331 unfold, the first locking part 332 and the second locking part 333 separate from each other, releasing the restriction on the pawls 331. At this time, the lifting adjustment seat 31 rises again, and the pawls 331 rise along the lifting adjustment groove 32. After the pawls 331 reach the lowest ratchet groove 321, the two pawls 331 can enter the two ratchet grooves 321 under the drive of the clamping elastic element, realizing the limiting cooperation between the pawls 331 and the ratchet groove 321. Then, the lifting adjustment seat 31 is moved upwards to the position to be adjusted.

[0049] Since the lifting adjustment seat 31 can achieve unidirectional step-by-step adjustment, when the position to be adjusted is lower than the current position, the backrest 10 needs to be raised to the highest position, then returned to the lowest position, and finally raised to the position to be adjusted.

[0050] The specific structure of the opening guide 323 can be designed according to actual needs. For example, in some optional embodiments, the opening guide 323 includes two guide slopes 3231. The two guide slopes 3231 gradually move away from each other from top to bottom. When the lifting adjustment seat 31 moves downward, the pawl 331 contacts the guide slope 3231 and is then gradually rotated by the guide slope 3231, so that the two pawls 331 move away from each other.

[0051] In some alternative embodiments, the closing guide portion 322 includes two guide straight portions 3221 arranged side by side. When the lifting adjustment seat 31 moves upward, the pawl 331 contacts the guide straight portion 3221 and is then guided to rotate by the guide straight portion 3221, so that the two pawls 331 move closer to each other until the two pawls 331 can move closer to each other until the first locking portion 332 and the second locking portion 333 engage. In this embodiment, the two guide straight portions 3221 are parallel to each other.

[0052] The specific structure of the first latching portion 332 and the second latching portion 333 can be designed according to actual needs. For example, in some optional embodiments, the first latching portion 332 is a latching slot, and the second latching portion 333 is a latching member. The latching member is inserted into the latching slot to achieve the latching engagement of the first latching portion 332 and the second latching portion 333. Of course, other suitable structures can also be adopted for the first latching portion 332 and the second latching portion 333, and this example is not limited to this one.

[0053] The aforementioned lumbar support rebound lifting mechanism can be applied to office chairs. The lumbar support rebound lifting mechanism includes: the aforementioned lumbar support rebound lifting mechanism.

[0054] 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 seat lumbar support rebound lifting mechanism, characterized in that, include: Backrest, lumbar support, height adjustment structure and rebound structure; The lifting and adjusting structure includes a lifting and adjusting seat, and the lumbar support is flexibly and adjustablely mounted on the backrest via the lifting and adjusting seat; The rebound structure includes a rebound elastic element, a first guide post disposed on the lifting adjustment seat, and a first guide sleeve disposed on the rear side of the lumbar support. The first guide sleeve is movably sleeved on the outside of the first guide post and can move back and forth relative to the first guide post. The rebound elastic element is disposed between the lifting adjustment seat and the lumbar support.

2. The seat lumbar support rebound lifting mechanism according to claim 1, characterized in that: The first guide post is provided with a guide groove, and a plurality of second guide posts are provided in the guide groove; The first guide sleeve is provided with a plurality of second guide sleeves, which are sleeved on the outside of the second guide post and slide in cooperation with the second guide post.

3. The seat lumbar support rebound lifting mechanism according to claim 2, characterized in that: The rebound elastic element includes multiple rebound springs, which are respectively sleeved on the outside of the second guide post and abut against the end of the second guide sleeve.

4. The seat lumbar support rebound lifting mechanism according to claim 2, characterized in that: The second guide post is provided with a spring-loaded locking component, and the inner wall of the second guide sleeve is provided with a limiting ring. The spring-loaded locking component is arranged inside the second guide sleeve, and the spring-loaded locking component is limited and engaged with the limiting ring.

5. The seat lumbar support rebound lifting mechanism according to claim 2, characterized in that: The outer side of the first guide post is provided with multiple spring-rebound guide grooves, and the inner side of the first guide sleeve is provided with multiple spring-rebound guide protrusions. The spring-rebound guide grooves are slidably engaged with the spring-rebound guide protrusions.

6. A seat lumbar support rebound lifting mechanism according to any one of claims 1 to 5, characterized in that: The lifting adjustment structure also includes a lifting adjustment groove and a sliding adjustment component. The lifting adjustment groove is provided on the backrest. Both sides of the lifting adjustment groove are provided with multiple ratchet grooves arranged sequentially from top to bottom. The upper end of the lifting adjustment groove is provided with a closing guide part, and the lower end of the lifting adjustment groove is provided with an opening guide part. The sliding adjustment component includes a clamping elastic element and two pawls. The two pawls are provided with a first locking part and a second locking part. The pawls are rotatably mounted on the lifting adjustment seat. 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 produce 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 lifting adjustment seat can only rise relative to the backrest; 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.

7. The seat lumbar support rebound lifting mechanism according to claim 6, characterized in that: The opening guide includes two guide slopes that gradually move away from each other from top to bottom.

8. A seat lumbar support rebound lifting mechanism according to claim 6, characterized in that: The closing guide section includes two guide sections, which are arranged side by side.

9. A seat lumbar support rebound lifting mechanism according to claim 6, 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.

10. An office chair, characterized in that, include: A seat lumbar support rebound lifting mechanism as described in any one of claims 1 to 9.

Images