JP2788712B2 - Chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair provided with a reclining mechanism for a backrest.

[0002]

2. Description of the Related Art Conventionally, as a chair with a reclining mechanism for a backrest, there is a chair in which a spring for a backrest is provided at a front central portion of a bottom case and a reclining mechanism is provided at a rear portion of the bottom case.

[0003]

However, in the prior art, the knob for adjusting the swing angle of the backrest, which is a part of the reclining mechanism, protrudes below the rear portion of the bottom case, so that the knob is not seated. In order to turn this knob in this state, the hand must be extended to the back of the chair, which is inconvenient.

Accordingly, an object of the present invention is to provide a chair in which the knob can be easily turned even while sitting.

[0005]

A feature of the present invention is that a spring for a backrest and a reclining mechanism are provided at a front portion of a bottom case in parallel in a front-rear direction, and the spring connects the bottom case and the backrest. The reclining mechanism includes an operating body, a bending lever, a spring body,
A spring force adjusting portion, one end of the operating body is provided with a fixed pin as a swing center, and the bending lever includes a first lever and a second lever;
One end of the lever is rotatably connected to one end of the operating body by a connecting pin, and one end of the second lever is rotatably supported by a fixed pin, and the first lever and the second lever are rotatably supported. The levers are rotatably connected to each other at the other end via a connecting pin, the spring force adjusting portion includes a compressing portion capable of compressing the spring body, and the bending lever includes the connecting portion. The spring force of the above-mentioned spring body is biased so that it can be bent about the pin.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a bottom case 2 is provided in the center of the lower portion of the seat cushion 1. A spring 3 for a backrest is provided on the front right side of the bottom case, and a reclining mechanism 4 for a backrest is provided on the front left side. It is provided parallel to the direction.

First, the structure of the spring 3 will be described. As shown in FIGS. 2 and 3, the spring 3 controls the movement of the backrest, and gas is injected into the body 30 having a cylindrical shape. One end 30a of the spring body 30 is formed with a columnar four-stage projection 31. The shaft 32 at the tip of the projection is normally projected, and can be moved into the projection by pushing. It is. The tip of the shaft 32 is in contact with a holding plate 71 supported at the front of the support frame 7 attached to the bottom case 2. Holding plate 7
1 has a lower end 71a pivotally supported by the support frame 7, and an upper end 71b has a hole in the center thereof, and a wire 73 penetrates the hole, and one end of this wire is formed. Is hung. The wire 73 passes through a hole formed in the vertical surface of the support plate 70, and the support plate is attached to one end above the support frame 7 and has a shape of L
It is shaped like a letter. The other end of the wire 73 is connected to an operation lever (not shown). The wire 73 extends from the support plate 70 to the operating lever, and its outer periphery is covered with a vinyl tube 74, and the wire is movable in this tube. A bolt is connected to one end of the tube 74 and the bolt is connected to the support plate 7.
The inside of a hole formed in the vertical surface of the support plate is screwed, and both sides of the support plate are fixed with nuts. The other end 30 b of the spring body 30 is rotatably connected to one end 33 a of the operating body 33 by the connecting pin 6. A backrest (FIG. 1 (10)) is supported at the other end (the right end side in FIG. 3) of the operating body 33. As shown in FIG. 3, a hole 34 is provided in a bent portion of the operating body 33, and as shown in FIG. The fixed shaft 45 penetrates in the horizontal direction, and the operating body 33 uses the shaft as a swing center to swing the bottom case 2.
Are supported by brackets 2a that stand up from the inner bottom.

Next, the structure of the reclining mechanism 4 will be described. As shown in FIGS. 4 to 6, this reclining mechanism includes an operating body 41, a bending lever 42, and a spring body 43.
And a spring force adjusting unit 44.

First, the operating body 41 will be described. A backrest (FIG. 1 (10)) is supported on the front end side (right end side in FIG. 4) of the operating body 41, and the fixing pin 45 is swung on the rear end side. It is supported by a bracket 2a rising from the inner bottom of the bottom case 2 as a moving center. The rear end of the operating body 41 is rotatably connected to one end of the bending lever 42 by the connecting pin 7.

Next, the bending lever 42 will be described. This bending lever is composed of a first lever 42a and a second lever 42b. As shown in FIG. 8, the main body of the first lever 42a and the second lever 42b is composed of a pair of plates positioned parallel to each other, and the paired plates are connected by connection plates 42a1 and 42b1, respectively. . First lever 42a and second lever 42b
As shown in FIG. 4, are connected rotatably to each other by a connecting pin 8 while being abutted at one end. The other end (the right side in the drawing) of the first lever 42a is rotatably connected to the operating body 41 by the connecting pin 7. The other end (left side in the drawing) of the second lever 42b is rotatably supported by a fixing pin 9 that is supported by a hat-shaped mounting frame 21 (FIGS. 4 and 9) that is cantilevered to the bottom case 2. I have. FIG.
As shown in FIG. 7, the bending lever 42 can be bent up and down around the coupling pin 8.

Next, the spring 43 and the spring force adjuster 44 will be described. As shown in FIG. 7, an adjustment screw shaft 22 protrudes forward of the bottom of the bottom case 2, and a knob 23 is attached to a lower end of the adjustment screw shaft. Figures 4 and 6
As shown in (1), a spring receiver 24 is attached to a lower portion of the adjusting screw shaft 22, and a spring retainer 25 is screwed to an upper portion of the adjusting screw shaft. The spring retainer 25 cannot be rotated by the rotation stopper 25a. Spring retainer 25
A spring body 4 composed of a coil spring is provided between the
The spring body is wound around an adjusting screw shaft 22.

The spring receiver 24 is in contact with the pressing plate 26a of the spring force transmitting body 26 located at the inner bottom of the bottom case 2. The pressing plate 26 a and the spring retainer 25 constitute a compression portion of the spring body 43. The spring force transmitting body 26 has an upper end connected to one side of the second lever 42b by the shaft 27 (FIGS. 4 and 8). Therefore, when the knob 23 is tightened, the adjusting screw shaft 22 rotates, so that the non-rotatable spring retainer 25 moves toward the spring receiver 24 along the adjusting screw shaft, so that the spring body 43 is compressed and the spring The compression force is applied to the pressing plate 26 of the spring force transmitting body 26 through the spring receiver 24.
a to the second lever 42b.

The reclining is adjusted by the compression allowance of the spring body 43. That is, by turning the knob 23, the spring body 4
By tightening 3, the spring body is compressed. When the compression allowance of the spring body 43 is small, the bending lever 42 can form a high mountain-like bent state around the coupling pin 8, so that the operating body 41 swings largely around the fixing pin 45. Can move. Further, when the compression allowance is large, the spring body 43 becomes hard and the bending lever 42 hardly forms a high mountain-shaped bent state.
Swing angle becomes smaller.

Next, the operation of the present invention will be described. First, the operation of the spring 3 will be described. To adjust the tilt angle of the backrest (FIG. 1 (10)), as shown in FIG. 3, by operating an operation lever (not shown), the other end of the wire 73 is pulled in the right direction in the drawing. Then, the upper portion of the holding plate 71 connected to one end of the wire moves rightward in the drawing around the one end 71 a pivotally supported by the support plate 7. Therefore, the shaft 32 is inserted into the projection 31, the spring 3 is in a free state, and the backrest can be moved. The tilt angle of the backrest is determined. To fix this angle, the operating lever is operated again to release the state in which the wire 73 is pulled, and the holding plate 71 is returned to the original position. For this reason, the shaft 32 projects again from the inside of the protrusion 31, the spring 3 is locked, and the inclination angle of the backrest is fixed.

Next, the operation of the reclining mechanism 4 will be described. When a load is applied to the backrest, as shown in FIG. 4, the operating body 41 swings clockwise about the fixing pin 45, and the first lever 42 a of the bending lever 42 swings with the swinging of the connecting pin 7. The coupling pin 8 moves upward at the same time. By this upward movement, the second lever 42b is fixed to the fixing pin 9
In the counterclockwise direction about the center of the backrest to move the pressing plate 26a of the spring force transmitting body 26 upward against the spring force of the spring body 43.
Gradually swings clockwise about the fixing pin 45. When a further load is applied to the backrest, the spring force transmitting body 2
The upward movement of the pressing plate 26a further compresses the spring body 43, and the spring force becomes tight, so that the predetermined swing angle of the operating body 41 is regulated.

[0016]

According to the present invention, since the knob for adjusting the swing angle of the backrest, which is a part of the reclining mechanism, protrudes below the front part of the bottom case, it can be easily operated even when sitting. You can turn this knob.

[Brief description of the drawings]

FIG. 1 is a plan view of a spring and a reclining mechanism.

FIG. 2 is an enlarged plan view of a spring and a reclining mechanism.

FIG. 3 is a sectional view taken along line aa of FIG. 2;

FIG. 4 is a sectional view taken along line bb of FIG. 2;

FIG. 5 is a plan view of a main part of the reclining mechanism.

FIG. 6 is a sectional view taken along line cc of FIG. 4;

FIG. 7 is a right side view of the reclining mechanism.

FIG. 8A is a perspective view of a first lever, and FIG. 8B is a perspective view of a second lever.

FIG. 9 is a perspective view of a mounting frame.

FIG. 10 is a perspective view of a spring force transmitting body.

[Explanation of symbols]

 Reference Signs List 2 bottom case 3 spring 4 reclining mechanism 41 operating body 42 bending lever 42a first lever 42b second lever 43 spring body 44 spring force adjusting unit 45 fixing pin 7 connecting pin 8 connecting pin 10 backrest

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47C 1/024 A47C 3/026 A47C 7/44

Claims (1)

(57) [Claims] A backrest spring (3) and a reclining mechanism (4) are provided in a front part of a bottom case (2) in a front-rear direction parallel to the front and rear directions, and the spring is connected to the bottom case and a backrest (10). The reclining mechanism includes an operating body (41), a bending lever (42), a spring body (43), and a spring force adjusting unit (4).
4), and one end of the operating body is provided with a fixed pin (45) as a swing center, and the bending lever includes a first lever (42a) and a second lever (42b). One end of the first lever is rotatably connected to one end of the operating body by a connection pin (7), and one end of the second lever is rotatably connected to a fixed pin (9). The first lever and the second lever are rotatably connected to each other at the other end via a connecting pin (8), and the spring force adjusting section is capable of compressing the spring body. The chair according to claim 1, wherein the bending lever is biased by a spring force of the spring body so as to be bent around the coupling pin.