KR200306816Y1 - Office chair having device for regulating the inclination of back - Google Patents

Abstract

The present invention proposes an office chair having a backrest angle adjusting mechanism capable of tilting the backrest as much as possible with a simple structure. The configuration of the present invention is; A base plate 2 on which an upper plate 4 is fixed; A first bracket 10 installed behind the bottom of the base plate; A second bracket 12 installed in front of the bottom of the base plate; A rear part connected to the backrest, and a front part connected to the first bracket 10 via a first hinge shaft 16 to allow the backrest to be flipped backward without resistance; One end is connected to the pivot 14 by a second hinge shaft 20, and the other end is connected to the second bracket 12 by a third hinge shaft 22 to rotate the pivot 14. It is characterized in that it comprises a link member 18, in which the angle can be specified, in particular the length can be adjusted to maintain the pivot 14 at any angle.

Description

Office chair having device for regulating the inclination of back}

The present invention relates to an office chair, and more particularly, to an office chair having a backrest angle adjusting mechanism capable of tilting the backrest as much as possible with a simple structure.

The backrest angle of the existing office chair has a limitation in its adjustment range. Most of the time, it was only a certain range of adjustment by the spring, which was possible by putting the user's weight on the back and back. That is, it was difficult to rest in a state in which the backrest was tilted and fixed at a desired angle.

In other non-office chairs, for example in the beauty industry, chairs are provided that can be completely tilted back using a gas cylinder to maintain a certain angle, but they are difficult to apply to office chairs due to structural complexity and excessive cost increase. It was. In addition, such a chair was only firmly fixed at a fixed angle, but did not cushion a predetermined angle range based on its position. In other words, it did not give comfort like a rocking chair.

The present invention with respect to the above problems, an object of the present invention is to provide an office chair having a structure that allows the user to relax by adjusting the backrest at a desired angle. More specifically, it is a simple structure to achieve the above-mentioned functions without significantly increasing the cost and furthermore to provide a safe office chair.

1 is a side view showing only the main part of the office chair according to an embodiment of the present invention.

2 to 3 are the same drawings as in FIG.

4 is a rear view in the state of FIG. 1.

5 is a cross-sectional view taken along the A-A direction of FIG. 1 to show the shape of the backrest.

Explanation of symbols on the main parts of the drawings

2 ; Base plate 4; Seat

6; Leg 8; back of a chair

10,12; First and second bracket 14; Community

16, 20, 22; 1, 2, 3 hinge axis

18 (28); Link member (gas cylinder) 26; Pushbutton

30; Pushbutton 34; cable

36; Outer frame 38; Natur

40; Cushion spring 42; Support rod

44; Support bolt 46,48; Male and female socket

50; connector

The above object, the base plate is fixed to the seat plate on the upper surface; A first bracket installed behind the bottom of the base plate; A second bracket installed in front of the bottom of the base plate; A pivoting body having a rear portion connected to the backrest and having a front portion connected to the first bracket via a first hinge axis so that the backrest is flipped back without resistance; One end is connected to the rotating body by a second hinge axis, and the other end is connected to the second bracket by a third hinge axis to set the rotation angle of the rotating body, and in particular, the length of the rotating body is adjustable. It is achieved by an office chair having a backrest angle adjustment mechanism, characterized in that it comprises a link member for maintaining the angle at an arbitrary angle.

According to a feature of the present invention, the link member is a gas cylinder having a structure capable of varying the overall length by operating a push button installed on the piston tip.

In addition, the rotating body has the same center of rotation and the outer frame rotated together and the back frame is made of the inner frame is substantially connected, and by holding the inner frame to the outer frame by a cushion spring, the outer frame is maintained at a specific angle When a force of more than a predetermined size is applied to the backrest, the spring force is overcome and the elastic movement is characterized in that the backrest additionally has a cushioning action.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 is a side view showing only the main part of the office chair according to an embodiment of the present invention. 2 to 3 are the same drawings as in FIG. 4 is a rear view in the state of FIG. 1.

On the upper surface of the base plate 2, the seat plate 4 is mounted and engaged by fastening means such as screws. The base plate 2 is usually a sheet metal molding, with the legs 6 connected at right angles in the center. The structure that is connected to the bridge 6 is shown simply because it is not relevant to the present invention.

The backrest 8 (used in the sense of including a narrow backrest and backrest frame, which is the same below) can be moved separately from the base plate 2.

The first bracket 10 is integrally installed at the rear of the bottom of the base plate 2, and the second bracket 12 is integrally installed at the front of the bottom of the base plate 2. The pivot 14 is hinged to the first bracket 10 to be rotatable about the first hinge axis 16, and the backrest 8 is connected to the rear of the pivot 14. In this state, the pivoting body 14 can rotate arbitrarily about the 1st hinge axis 16, and the backrest 8 also rotates by arbitrary angles. The link member 18 is hinged between the lower end of the pivot 14 and the second bracket 12 to specify the rotation angle of the backrest. Depending on the length of the link member 18, the angle of the pivot body 14 and the backrest 8 which moves in dependence also varies.

As a result, all three hinge shafts 16, 20, and 22 are formed. The first hinge shaft 16 has the first bracket 10 and the pivot 14, and the second hinge shaft 20 has the pivot ( 14 and one end of the link member 18, the third hinge shaft 22 connects the other end of the link member 18 and the second bracket 12, respectively. The axis center of each hinge axis forms a sharp triangular shape, that is, the center of the first hinge axis 16 lies on the extension of the centers of the second hinge axis 20 and the third hinge axis 22. As a result, the base plate 2, the pivot 14, and the link member 18 are operated like a link mechanism.

According to an embodiment of the present invention, the link member 18 is a gas cylinder 28, or shock absorber (shock shock absorber) having a structure that can change the overall length by operating the push button 26 installed at the tip of the piston 24 An absorber is recommended, and in some cases, a screw system that can be adjusted by the user by the handle in place of the gas cylinder 28 may be employed.

In the gas cylinder method, the push lever 30 for pressing the pushbutton 26 in front of the piston is hinged to the piston connecting portion 32 of the gas cylinder. As a method for operating the push lever 30, an operation lever installed to extend laterally on the bottom of the seat plate may be used as in the conventional way of adjusting the seat plate height. According to an embodiment of the present invention, the cable 34 is connected to the driving part of the push lever 30 and the cable 34 passes through the armrest 5 made of pipes to extend to the end of the armrest, and the end of the cable There may be a way to connect the small lever 35 to. That is, the push lever can be started by pulling or releasing the cable using the small lever.

According to another feature of the present invention, the backrest 8 can be laid on the user's desired degree by the pivoting body 14, and at the same time, the backrest 8 can perform a range of cushioning functions. This is made possible by the cushioning mechanism installed inside the rotating body. The cushion mechanism will be described below.

First, the pivot 14 is composed of an outer frame 36 to which the link member 18 is connected, an inner frame 38 to which the backrest 8 is connected, and a cushion spring 40 to connect both. In the state in which the inner frame 38 is wrapped inside the outer frame 36, the first hinge shaft 16 is pivoted together. The cushion spring 40 is installed to apply a force to push the inner mold 38 to the bottom face 36a of the outer mold 36. That is, the upper end of the cushion spring 40 is in contact with the inner bottom 38a, and the lower end of the spring is supported by the outer frame 36 by the supporting rod 42 and the supporting bolt 44. The spring is protected and held by the male and female sockets 46 and 48.

When the link member 18 is fixed to a specific length, that is, when a force of a predetermined size or more is applied to the backrest 8 while the outer frame 36 is fixed at a specific inclination, the inner frame (as shown in FIG. 38) is separated from the outer frame 36 by the spring force is rotated as the cushion spring 40 is compressed around the first hinge axis (16).

According to another embodiment of the present invention, the backrest angle limiting means is provided for the safety of the user. This causes the tip of the rotating body, that is, the tips 36b and 38b of the outer frame and the inner frame to protrude sharply, as shown in FIGS. When it reaches a degree, the protruding surfaces or the tips 36b and 38b are in contact with the base plate bottom surface 2a. As shown, the protruding tip 36b of the outer frame is located lower than the protruding tip 38b of the inner frame, with the difference in mind regarding the working range of the cushion spring. That is, even when the outer frame 36 is rotated to the maximum and can no longer be rotated, there is a cushioning action, and the cushioning action is also limited to a certain limit by the protruding tip 38b of the inner frame 38.

4 is a rear view of the office chair, in which the link member 18 is for explaining a more specific shape of the installation position to the pivot body 14. The rotating body 14 or the outer frame and the inner frame are installed at the center position of the base plate 2 and are widened from side to side so that the force transmitted from the backrest 8 can be stably supported. Of course, the link member 18 may be installed on both sides of the rotating body, but in this embodiment, only the one side of the rotating body 14 is installed. However, the force is transmitted to the other side by installing the connector 50 using the bushing to cross the rotating body for the balance of force distribution.

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According to yet another embodiment of the present invention, when the backrest 8 is laid down, there are provided means for guiding the user's body about the user's body and means for supporting the backrest more stably.

5 is a cross-sectional view taken along the A-A direction of FIG. 1 to show the shape of the backrest. That is, as shown, the backrest, in particular its lower end 8a, is curved and extended at an angle of 30 ° to 80 ° toward the front so as to cover a part of the user's body.

In addition, the frame 8b for fixing the backrest to the pivot 14 is divided into two sides, i.e., bifurcated, so that the force applied to the backrest is balanced in right and left. This is to prevent the backrest from tipping too much to the left and right.

Those skilled in the art will be able to make various modifications without departing from the spirit of the present invention with reference to the above-described and described. For example, the gas cylinder (showr) used as the link member may be replaced by another mechanical element that can be easily adjusted in length, or the link member may be installed on both sides of the rotating body.

According to the above configuration, there is provided an office chair having a structure that allows the user to relax by adjusting the backrest at a desired angle. In addition, an office chair having a structure capable of supporting the user's body more stably is provided.

Claims (5)

A base plate 2 on which an upper plate 4 is fixed; A first bracket 10 installed behind the bottom of the base plate; A second bracket 12 installed in front of the bottom of the base plate; A rear part connected to the backrest, and a front part connected to the first bracket 10 via a first hinge shaft 16 to allow the backrest to be flipped backward without resistance; One end is connected to the pivot 14 by a second hinge shaft 20, and the other end is connected to the second bracket 12 by a third hinge shaft 22 to rotate the pivot 14. An office chair having a backrest angle adjusting mechanism, characterized in that it comprises a link member (18) for specifying the angle, the length of which can be adjusted in particular to maintain the pivot (14) at an arbitrary angle. The method of claim 1, wherein the link member 18 is a gas cylinder 28 having a backrest angle adjustment mechanism, characterized in that the overall length can be changed by operating a push button installed on the front end of the piston. chair. 2. The rotating body (14) according to claim 1, wherein the pivot (14) consists of an inner frame (38) to which the outer frame (36) rotated about the first hinge shaft (16) and the backrest (8) substantially connected. When the inner frame 38 is supported by the cushion spring 40 to the outer frame 36, when a force of a predetermined magnitude or more is applied to the backrest 8 while the outer frame 36 is maintained at a specific angle. An office chair having a backrest angle adjustment mechanism, wherein the backrest additionally cushions by spring force and elastic movement. According to claim 1, The backrest (8) is bent at an angle of 30 ° to 80 ° toward the front so that both ends (8a) of the body portion of the user can be wrapped, it can support the user stably Office chair having a backrest angle adjustment mechanism characterized in that there is. 2. The frame (8b) according to claim 1, wherein the frame (8b) for fixing the backrest (8) to the pivoting body (14) is divided into two sides, i.e., bilaterally so as to balance the force applied to the backrest from side to side. Office chair having a backrest angle adjustment mechanism, characterized in that.