CN110840139A

CN110840139A - Backrest locking device for office chair

Info

Publication number: CN110840139A
Application number: CN201911209828.7A
Authority: CN
Inventors: 曾小辉; 吴金龙; 曾小方
Original assignee: Jiangxi Honghui Industry Co Ltd
Current assignee: Jiangxi Honghui Industry Co Ltd
Priority date: 2019-12-01
Filing date: 2019-12-01
Publication date: 2020-02-28

Abstract

The invention discloses a backrest locking device for an office chair, which comprises a support plate and an adjusting rotating shaft, wherein a convex block is arranged below one side of the support plate, a through hole is formed in one side of the support plate, which is close to the convex block, a backrest is arranged above one side of the support plate, which is close to the convex block, the adjusting rotating shaft penetrates through the convex block, the two ends of the adjusting rotating shaft are fixed with the backrest, the adjusting rotating shaft is provided with a locking device, the locking device comprises an adjusting rod and a ratchet wheel, the ratchet wheel is fixed at the position, which is close to the two ends, of the adjusting rotating shaft, and a locking plate is fixed at the position, which is vertically corresponding to the ratchet wheel, on the adjusting rod. Therefore, the whole backrest is convenient to adjust, and the device is simple in integral structure and suitable for office use.

Description

Backrest locking device for office chair

Technical Field

The invention relates to the technical field of chairs, in particular to a backrest locking device for an office chair.

Background

The office chair is office furniture which is required by office workers every day, the design form of the office chair is more and more abundant along with the improvement of living standard, and the comfort is greatly improved, but the office workers need to sit on the office chair for more than five and six hours every day, even sit on the office chair for more than ten hours every day during working, waist soreness and backache of the workers can still be caused when the office chairs are seated in the same sitting posture for a long time, and fatigue of the workers can be relieved when the office chairs are laid down and facing upward;

in the prior art, an office chair with an adjustable backrest is also provided, but the structure is complex and the adjustment is troublesome.

Disclosure of Invention

The invention aims to provide a backrest locking device for an office chair, which aims to solve the problems that the office chair with an adjustable backrest in the prior art is complex in structure and troublesome to adjust.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an office chair uses back locking device, includes backup pad and regulation pivot, protruding piece is installed to one side below of backup pad, the backup pad is close to one side of protruding piece and has seted up the through-hole, the backup pad is close to one side top of protruding piece and installs the back, it passes protruding piece to adjust the pivot, and adjusts the both ends of pivot and fix mutually with the back, it is provided with locking device to adjust the pivot, locking device is including adjusting pole and ratchet, the ratchet is fixed in the position that the pivot of adjusting is close to both ends, adjust the pole and pass the through-hole, and the rigidity that corresponds with the ratchet is perpendicular on adjusting the pole has the jam plate.

Preferably, the rear end of the adjusting rod is fixed with a rotating handle, and a torsion spring is sleeved outside the part of the circumference of the adjusting rod, which is positioned inside the through hole.

Preferably, a groove is formed in the inner wall of the through hole, and the pin of the torsion spring is inserted into the groove.

Preferably, a protective shell is arranged outside the ratchet wheel and the dead locking plate.

Preferably, the supporting legs are arranged below the supporting plate, and handrails are fixed on two sides above the supporting plate.

Preferably, a cushion is mounted on the upper surface of the supporting plate, and a soft adding part is mounted on one side, close to the cushion, of the backrest.

Compared with the prior art, the invention has the beneficial effects that: when the angle of the backrest is adjusted, the backrest only needs to be directly pressed, the backrest is pressed to the required angle, the torsion spring can drive the locking plate to return to lock the ratchet wheel after the backrest is pressed to the required angle, the backrest angle can be locked at the moment, and the whole backrest is convenient to adjust.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the locking device of the present invention;

FIG. 3 is a schematic view of the position of the ratchet wheel on the protruding block according to the present invention;

fig. 4 is a schematic view of the internal structure of the adjusting lever of the present invention on the supporting plate.

In the figure: 1. supporting legs; 2. a cushion; 3. a support plate; 31. a protruding block; 32. a through hole; 321. a groove; 4. a handrail; 5. a backrest; 51. a soft addition part; 6. a locking device; 61. adjusting a rod; 62. a ratchet wheel; 63. locking the plate; 64. turning a handle; 65. a torsion spring; 7. and adjusting the rotating shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, in the embodiment of the present invention, a backrest locking device for an office chair includes a supporting plate 3 and an adjusting rotating shaft 7, a seat cushion 2 is installed on the upper surface of the supporting plate 3, the supporting plate 3 plays a main role of a chair, the seat cushion 2 should be made of soft sponge or fiber cloth, a backrest 5 is installed above one side of the supporting plate 3 close to a protruding block 31, a soft adding part 51 is installed on one side of the backrest 5 close to the seat cushion 2, the soft adding part 51 can make people feel more comfortable when leaning on the backrest 5, the backrest should be made of soft sponge or fiber cloth, a supporting leg 1 is installed below the supporting plate 3, the supporting leg 1 plays a role of supporting the supporting plate 3, armrests 4 are fixed on both sides above the supporting plate 3, and the armrests 4 can be held by hands;

referring to fig. 1, a protruding block 31 is installed below one side of a support plate 3, a through hole 32 is formed in one side, close to the protruding block 31, of the support plate 3, the through hole 32 is used for accommodating an adjusting rod 61, an adjusting rotating shaft 7 penetrates through the protruding block 31, the protruding block 31 is used for installing the adjusting rotating shaft 7, two ends of the adjusting rotating shaft 7 are fixed to a backrest 5, the backrest 5 can rotate on the support plate 3 along with rotation of the adjusting rotating shaft 7, a locking device 6 is arranged on the adjusting rotating shaft 7, and the locking device 6 is used for locking the adjusting rotating shaft 7;

referring to fig. 2 and 3, the locking device 6 includes an adjusting lever 61 and a ratchet 62, the ratchet 62 is fixed at a position of the adjusting shaft 7 near both ends, the adjusting lever 61 passes through the through hole 32, a locking plate 63 is fixed at a position of the adjusting lever 61 vertically corresponding to the ratchet 62, a protective casing is arranged outside the ratchet 62 and the locking plate 63, when the locking plate 63 locks the ratchet 62, the ratchet 62 cannot rotate clockwise according to the view angle shown in fig. 3, i.e. the ratchet 62 is locked in the clockwise rotation direction, and no matter how a person presses the backrest 5, the adjusting shaft 7 cannot rotate clockwise due to pressure;

referring to fig. 2 and 4, a rotating handle 64 is fixed at the rear end of the adjusting rod 61, a torsion spring 65 is sleeved outside the part of the circumference of the adjusting rod 61, which is positioned inside the through hole 32, a groove 321 is formed in the inner wall of the through hole 32, pins of the torsion spring 65 are inserted into the groove 321, the rotating handle 64 is rotated, the adjusting rod 61 can be rotated, the locking plate 63 is rotated to leave the ratchet 62, the ratchet 62 can rotate clockwise and counterclockwise at the moment, the angle adjustment of the backrest 5 is realized, and when the rotating handle 64 is not rotated any more, the ratchet 62 is continuously clamped by the locking plate 63 due to the resetting capability of the torsion spring 65.

The working principle and the using process of the invention are as follows: when the device is used, a person sits on the seat cushion 2 and leans against the backrest 5;

when the angle of the backrest 5 needs to be adjusted, the rotating handle 64 is rotated, the adjusting rod 61 is rotated (the torsion spring 65 is in an open state at this time), the locking plate 63 is rotated to be away from the ratchet 62, the upper side of the backrest 5 is pressed at this time, the backrest 5 can drive the adjusting rotating shaft 7 to rotate clockwise at the visual angle shown in fig. 1, after the angle is adjusted, the rotating handle 64 is loosened, the locking plate 63 continues to block the ratchet 62 due to the resetting capability of the torsion spring 65, and when a person applies pressure to the backrest 5, the ratchet 62 is locked by the locking plate 63, the adjusting rotating shaft 7 does not rotate any more, and therefore the position of the backrest 5 is locked.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a back locking device for office chair, includes backup pad (3) and regulation pivot (7), its characterized in that: protruding piece (31) are installed to one side below of backup pad (3), through-hole (32) have been seted up to one side that backup pad (3) are close to protruding piece (31), backup pad (3) are close to one side top of protruding piece (31) and install back (5), adjust pivot (7) and pass protruding piece (31), and the both ends of adjusting pivot (7) are fixed mutually with back (5), it is provided with locking device (6) to adjust pivot (7), locking device (6) are including adjusting pole (61) and ratchet (62), ratchet (62) are fixed in the position that adjusts pivot (7) and are close to both ends, adjust pole (61) and pass through-hole (32), and adjust the position fixation that pole (61) go up and correspond perpendicularly with ratchet (62) and have locking board (63).

2. An office chair back lock device according to claim 1, wherein: the rear end of the adjusting rod (61) is fixed with a rotating handle (64), and a torsion spring (65) is sleeved outside the part of the circumference of the adjusting rod (61) which is positioned inside the through hole (32).

3. An office chair back lock device according to claim 2, wherein: a groove (321) is formed in the inner wall of the through hole (32), and pins of the torsion spring (65) are inserted into the groove (321).

4. An office chair back lock device according to claim 1, wherein: and a protective shell is arranged outside the ratchet wheel (62) and the locking plate (63).

5. An office chair back lock device according to claim 1, wherein: supporting legs (1) are arranged below the supporting plate (3), and handrails (4) are fixed on two sides above the supporting plate (3).

6. An office chair back lock device according to claim 1, wherein: the upper surface mounting of backup pad (3) has cushion (2), soft portion (51) that adds is installed to one side that back (5) are close to cushion (2).