Waist rest lifting adjusting mechanism and office chair

Abstract

The utility model relates to a waist rest lifting adjusting mechanism and an office chair. The technical problem that an existing waist rest is unreasonable in height adjustment design is solved. The waist rest lifting adjusting mechanism comprises a backrest and a waist rest which are connected in a sliding mode. The sliding channel is arranged on the backrest, and a gear groove formed along the inner wall of the sliding channel is formed in the sliding channel; the sliding block is arranged at one end of the waist rest and is arranged in the sliding channel in a sliding manner; the locking assembly comprises a limiting block and a locking block, the limiting block is movably arranged on one side of the sliding block in a penetrating mode and can be clamped into the gear groove, the locking block is arranged on the sliding block in a sliding mode, and the outer wall of the locking block abuts against the limiting block to force the limiting block to be clamped into the gear groove; the outer wall of the locking block is provided with an unlocking receding groove for the limiting block to be separated from the gear groove and clamped into the locking block. According to the waist rest lifting adjusting mechanism, the structural compressive strength is improved, the service life is prolonged, the overall adjusting movement is smooth, and the adjusting efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of chairs and relates to a lumbar support lifting and lowering adjustment mechanism and an office chair. Background Art

[0002] For example, a Chinese patent document discloses a lifting and adjusting mechanism for a lumbar support [202120921612.X], comprising a sliding mounting seat arranged on a chair back and a lifting and adjusting rod capable of sliding up and down along the sliding mounting seat, the lifting and adjusting rod being configured to be connected to the lumbar support; the lifting and adjusting rod comprises a sliding portion and a control handle mirror-arranged on both sides of the sliding portion; a connecting seat is provided on the front side of the sliding mounting seat, and the sliding portion is clamped and slidably engaged between the connecting seat and the sliding mounting seat; the sliding mounting seat is also provided with a plurality of longitudinally spaced positioning grooves, and the lifting and adjusting rod is correspondingly provided with a movable tooth and a control switch capable of controlling the movable tooth to engage in or disengage from the positioning groove, and the control switch is rotatably connected to the control handle.

[0003] The drawback of the above technical solution is that the rotation unlocking method has high requirements on the pressure bearing capacity of the movable teeth and the positioning groove, the control switch structure is easily damaged by force, and the service life is short. Utility Model Content

[0004] The purpose of the utility model is to provide a lumbar support lifting and adjusting mechanism and an office chair in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The lumbar support lifting and adjusting mechanism comprises a backrest and a lumbar support which are slidably connected; a sliding channel is arranged on the backrest, and a shifting groove is arranged along the inner wall of the sliding channel in the sliding channel;

[0007] A sliding block, arranged at one end of the waist support and slidably arranged in the sliding channel;

[0008] The locking assembly includes a limiting block movably arranged on one side of the sliding block and capable of being inserted into the gear groove, and a locking block slidably arranged on the sliding block. The outer wall of the locking block abuts against the limiting block to force the limiting block to be inserted into the gear groove. The outer wall of the locking block is provided with an unlocking and yielding groove for the limiting block to be disengaged from the gear groove and inserted into the locking block.

[0009] Furthermore, the sliding block is provided with a limiting hole through which the limiting block passes, and the outer diameter of the limiting block is greater than the depth of the limiting hole.

[0010] Further, the limiting block is a movable block movably arranged in the limiting hole.

[0011] Further, the limiting block is an elastic membrane arranged in the limiting hole, and one end of the elastic membrane can be elastically deformed and inserted into the shifting slot or the unlocking and yielding slot.

[0012] Furthermore, one end of the locking block is slidably embedded in the sliding block, and a clearance hole for the end of the locking block to pass through is provided on one side of the sliding block.

[0013] Furthermore, the sliding block is provided with a guide groove, and the locking block is provided with a guide block embedded in the guide groove and moving along the guide groove.

[0014] Furthermore, a spring is provided between the sliding block and the locking block, forcing one end of the locking block to have a tendency to extend out of the clearance hole.

[0015] Furthermore, a guide rail protruding inwards is provided inside the sliding channel, and a sliding groove for the guide rail to be embedded in is provided on the sliding block.

[0016] Furthermore, the outer wall of the guide rail is provided with a contact convex strip abutting against the sliding groove.

[0017] The utility model also provides an office chair, which has the waist support lifting and lowering adjustment mechanism as described above.

[0018] Compared with the prior art, the lumbar support lifting and adjusting mechanism of the present invention achieves a smooth overall adjustment movement by moving the limiting block in the limiting hole of the sliding block and relying on the structural strength of the sliding block itself, so that the pressure exerted on the limiting block in the locked or unlocked state can be evenly distributed to other structures, thereby improving the compressive strength of the structure and increasing its service life. In addition, the limiting block is movable and unlocked in a manner that makes the overall adjustment movement smooth, thereby improving the adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model provides a lumbar support lifting and adjusting mechanism and an office chair schematic diagram.

[0020] Figure 2 for Figure 1 A schematic diagram of the movement of a sliding block of a lumbar support lifting and lowering adjustment mechanism.

[0021] Figure 3 for Figure 2 A cross-sectional view of a locking assembly of a lumbar support lifting and lowering adjustment mechanism.

[0022] Figure 4 for Figure 2 A cross-sectional view of the movement of a locking block of a lumbar support lifting and lowering adjustment mechanism.

[0023] Figure 5 for Figure 1 A schematic diagram of a second embodiment of the lumbar support lifting and adjusting mechanism.

[0024] In the figure, 10, backrest; 11, sliding channel; 12, shift slot; 13, clearance hole; 14, guide rail; 15, contact ridge; 20, lumbar support; 30, sliding block; 31, limiting hole; 32, guide slot; 33, sliding slot; 40, locking assembly; 41, limiting block; 42, locking block; 43, unlocking clearance slot; 44, guide block; 45, spring. DETAILED DESCRIPTION

[0025] Embodiment 1

[0026] See also Figures 1 to 4 , which is a schematic diagram of a lumbar support lifting and adjusting mechanism and an office chair provided by the utility model. The lumbar support lifting and adjusting mechanism comprises a backrest 10 and a lumbar support 20 connected in a sliding manner, a sliding channel 11 arranged on the backrest 10, a sliding block 30 slidably arranged in the sliding channel 11, and a locking assembly 40 for limiting the sliding of the sliding block 30 along the sliding channel 11. It can be imagined that the lumbar support lifting and adjusting mechanism also includes other functional components and specific structures, such as a mounting structure, etc., which are all well-known technologies to those skilled in the art, so they will not be described in detail one by one here.

[0027] A mounting seat is provided on one side of the backrest 10, and a sliding channel 11 is provided in the mounting seat. In this embodiment, the sliding channel 11 is a frame structure. A sliding block 30 is provided at one end of the lumbar support 20, and one end of the sliding block 30 is embedded in the sliding channel 11, and can slide back and forth along the sliding channel 11, that is, the lifting and lowering adjustment of the lumbar support 20 on the backrest 10 is formed. A guide rail 14 protruding inward is provided inside the sliding channel 11, and a sliding groove 33 for the guide rail 14 to be embedded is provided on the sliding block 30. Through the sliding guide cooperation between the guide rail 14 and the sliding groove 33, the movement accuracy of the sliding block 30 is improved. A contact convex strip 15 is provided on the outer wall of the guide rail 14 to abut against the sliding groove 33. The contact convex strip 15 reduces the contact area between the guide rail 14 and the sliding groove 33, reduces friction and increases sliding smoothness. It can be imagined that the contact convex strip 15 can also be provided in the sliding groove 33 to further increase the sliding smoothness.

[0028] The sliding channel 11 is provided with a shifting groove 12 arranged along the inner wall of the sliding channel 11. In the present embodiment, the shifting groove 12 is an arcuate groove arranged continuously in the longitudinal direction, each arcuate groove corresponds to a different height shift of the lumbar support 20, and cooperates with the locking assembly 40 to realize the fixed setting of the lumbar support 20 on the backrest 10.

[0029] The locking assembly 40 includes a limiting block 41 that is movably arranged on one side of the sliding block 30 and can be inserted into the gear groove 12. The limiting block 41 is a movable block movably arranged in the sliding block 30. A limiting hole 31 through which the limiting block 41 passes is provided on the sliding block 30. The outer diameter of the limiting block 41 is greater than the depth of the limiting hole 31. The external structure of the limiting block 41 is in a state of protruding from the limiting hole 31 to adapt to the locked or unlocked state.

[0030] In this embodiment, the limiting block 41 is spherical and rolls in the limiting hole 31 . The limiting block 41 has a small movement resistance and a higher efficiency in changing the unlocking or locking state. The outer shape of the limiting block 41 can fit in the shifting slot 12 .

[0031] The sliding block 30 is provided with a locking block 42 for sliding. In this embodiment, the interior of the sliding block 30 is provided with a cavity communicating with the limiting hole 31. One end of the locking block 42 is slidably embedded in the sliding block 30. A clearance hole 13 for the end of the locking block 42 to pass through is provided on one side of the sliding block 30. By applying force to the end of the locking block 42 passing through the clearance hole 13, the locking block 42 can be driven to slide in the sliding block 30. The sliding block 30 is provided with a guide groove 32. The locking block 42 is provided with a guide block 44 embedded in the guide groove 32 and moving along the guide groove 32. Through the sliding cooperation between the guide block 44 and the guide groove 32, the sliding guide of the locking block 42 in the sliding block 30 is made more precise.

[0032] It is conceivable that, when in the locked state, the outer wall of the locking block 42 abuts against the limiting block 41 to force the limiting block 41 to be stuck in the shifting groove 12 , and the sliding block 30 cannot move along the sliding channel 11 , thereby achieving the purpose of adjusting and locking the lumbar support 20 .

[0033] The outer wall of the locking block 42 is provided with an unlocking and giving way groove 43 for the limiting block 41 to be disengaged from the shifting groove 12 and to be inserted into the locking block 42. When the locking block 42 is driven to move until the unlocking and giving way groove 43 is completely connected to the limiting hole 31, the limiting block 41 can be movably disengaged from the shifting groove and inserted into the unlocking and giving way groove 43, that is, the sliding block 30 enters the unlocking state, and the sliding block 30 and the locking block 42 keep the unlocking state and move synchronously, and are adjusted until the limiting hole 31 is connected to another arc-shaped groove corresponding to the height of the lumbar support 20, and the locking block 42 is returned to the original position and locked. The way in which the limiting block 41 is movably unlocked makes the overall adjustment movement smooth, and improves the adjustment efficiency.

[0034] In this embodiment, the locking block 42 moves vertically in the sliding block 30 and can automatically return to its original position under the action of gravity. Optimally, a spring 45 is provided between the sliding block 30 and the locking block 42, forcing one end of the locking block 42 to have a tendency to extend out of the clearance hole 13. Under the action of the spring 45, the locking block 42 can automatically return to its original position and cannot move without external force. By moving the limiting block 41 in the limiting hole 31 of the sliding block 30, relying on the structural strength of the sliding block 30 itself, the pressure on the limiting block 41 in the locked or unlocked state can be evenly distributed to other structures, thereby improving the compressive strength of the structure and increasing the service life.

[0035] Embodiment 2

[0036] See also Figure 5 The structure and principle of this embodiment are basically the same as those of the first embodiment, and the only difference is that: further, the limiting block 41 is an elastic membrane arranged in the limiting hole 31, and one end of the elastic membrane can be elastically deformed and inserted into the shifting slot 12 or the unlocking and giving way slot 43. The elastic membrane has an elastic deformation part in the middle, which can protrude to both sides and correspondingly insert into the shifting slot 12 or the unlocking and giving way slot 43, so as to achieve the same locking or unlocking method as the first embodiment.

[0037] Embodiment 3

[0038] The utility model also provides an office chair, which has the above-mentioned lumbar support lifting and adjusting mechanism. Except for the lumbar support lifting and adjusting mechanism, other components are all existing technologies or commercially available parts.

[0039] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A lumbar support lifting and adjusting mechanism, comprising a backrest and a lumbar support slidably connected, characterized in that: The lumbar support lifting and adjusting mechanism also includes: A sliding channel is arranged on the backrest, wherein the sliding channel is provided with a shifting groove arranged along the inner wall of the sliding channel; A sliding block, arranged at one end of the waist support and slidably arranged in the sliding channel; The locking assembly includes a limiting block movably arranged on one side of the sliding block and capable of being inserted into the gear groove, and a locking block slidably arranged on the sliding block. The outer wall of the locking block abuts against the limiting block to force the limiting block to be inserted into the gear groove. The outer wall of the locking block is provided with an unlocking and yielding groove for the limiting block to be disengaged from the gear groove and inserted into the locking block.

2. The lumbar support lifting and adjusting mechanism according to claim 1, characterized in that: The sliding block is provided with a limiting hole through which the limiting block passes, and the outer diameter of the limiting block is greater than the depth of the limiting hole.

3. The lumbar support lifting and adjusting mechanism according to claim 2, characterized in that: The limiting block is a movable block movably arranged in the limiting hole.

4. The lumbar support lifting and adjusting mechanism according to claim 2, characterized in that: The limiting block is an elastic membrane arranged in the limiting hole, and one end of the elastic membrane can be elastically deformed and inserted into the shifting slot or the unlocking and yielding slot.

5. The lumbar support lifting and adjusting mechanism according to claim 1, characterized in that: One end of the locking block is slidably embedded in the sliding block, and one side of the sliding block is provided with a clearance hole for the end of the locking block to pass through.

6. The lumbar support lifting and adjusting mechanism according to claim 5, characterized in that: The sliding block is provided with a guide groove, and the locking block is provided with a guide block embedded in the guide groove and moving along the guide groove.

7. The lumbar support lifting and adjusting mechanism according to claim 5, characterized in that: A spring is arranged between the sliding block and the locking block, forcing one end of the locking block to have a tendency to extend out of the clearance hole.

8. The lumbar support lifting and adjusting mechanism according to claim 1, characterized in that: A guide rail protruding inward is arranged inside the sliding channel, and a sliding groove for the guide rail to be embedded is arranged on the sliding block.

9. The lumbar support lifting and adjusting mechanism according to claim 8, characterized in that: The outer wall of the guide rail is provided with a contact convex strip abutting against the sliding groove.

10. An office chair, characterized in that: A lumbar support lifting and adjusting mechanism according to any one of claims 1 to 9.

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