JP3528020B2 - Chair tilting device - 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 seat tilting device capable of tilting a chair seat back and forth against an elastic force.

[0002]

2. Description of the Related Art Conventionally, various chairs having a mechanism for tilting a seat back and forth have been provided. For office work on a desk or operation of electronic devices, especially keyboard operation of a word processor, etc., it is easy to lean forward, so that the seat of the chair leans forward, that is, the front of the seat sinks. This is preferable because it does not press the seated person's crotch. On the other hand, the reclining posture at rest is preferably such that the seat portion is tilted backward, that is, the rear portion of the seat portion is depressed.

However, since the mechanism for tilting the seat back and forth is generally complicated and expensive, it is only used for high-class chairs.

For example, Japanese Utility Model Publication No. 61-61
No. 24110, a seat plate supporting member fixed to a leg and a pair of left and right seat plate supporting members arranged outside the seat plate supporting member are arranged horizontally in a horizontal direction through a torsion bar. Cylindrical support in which the base end is inserted into a cylindrical member fixed to an arm extending from the seat plate support member and the ends thereof are non-rotatably fixed, and the tip of the torsion bar is fixed to the seat plate support body. Disclosed is a chair which is inserted into a member and whose ends are non-rotatably locked so that a seat plate fixed to an upper surface of a seat plate support can be tilted rearward against a torsion elastic force of a torsion bar. ing.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is to solve the problem that a seat portion of a chair can be tilted forward or backward or backward or forward against an elastic force. It is another object of the present invention to provide a seat tilting device which is simple in structure and assembly and can be constructed at low cost.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a seat portion is rotatably pivoted forward and backward with respect to a leg portion, and a pressing portion is projectingly provided on a member that rotates integrally with the seat portion. When the seat body is tilted forward, backward, or forward or backward, the elastic body held against the legs is elastically compressed by the pressing portion, and the restoring force of the elastic body restores the seat to the original angle. Then, the above-mentioned subject was solved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A seat tilting device of a chair according to the present invention comprises:
A lateral beam of a seat frame that supports the seat is pivotally supported by a seat receiver attached to the leg so that the lateral beam can be rotated forward and backward. An elastic body is arranged on a seat receiving body corresponding to the portion, and the elastic body is elastically compressed by the pressing portion when the seat portion tilts forward or backward.

If a structure in which a rubber elastic body is loosely inserted in a recess provided in the seat receiving body is adopted, the rubber elastic body is pushed by a pressing portion projecting on the lateral beam as the seat portion tilts. It elastically compresses the body. Here, by loosely inserting the rubber elastic body into the recess of the seat receiving body, the degree of freedom of deformation is secured even when the elastic body is compressed by the pressing portion, and the assembling work is extremely simplified. Of.

Further, if a structure is adopted in which the lateral beam is made of a metal pipe and a part of the lateral beam is flattened to form the pressing portion, a tilting mechanism is provided to the member constituting the seat frame itself. Since it can be provided, the number of parts is reduced and the structure is simplified, which is preferable.

[0010]

The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. 1 and 2 show an example of a chair according to the present invention, in which 1 is a leg portion, 2 is a seat portion, 3 is a backrest portion, 4 is a seat receiver, and 5 is a seat frame.

In the leg portion 1, a shaft cylinder 7 is erected at the center of five radially extending support legs 6, ... And a gas cylinder 8 is inserted in the shaft cylinder 7 so as to be able to move up and down. .

The seat portion 2 is formed by superposing a seat outer shell 9 and a seat inner shell 10 having a cushion laminated on the upper surface.

The backrest portion 3 is divided into a lower backrest portion 3a and an upper backrest portion 3b, and the upper backrest portion 3b is connected to the lower backrest portion 3a so as to be tiltable backward. The lower backrest portion 3a is formed by superimposing the lower back outer shell 11 and the lower back inner shell 12 having a cushion laminated on the front surface, and the upper backrest portion 3b is an upper back inner portion having the upper back outer shell 13 and a cushion layered on the front surface. Shell 14
Are superposed on each other and are connected by elastically bendable connecting members 15 on both sides.

The seat receiving body 4 is for supporting the seat portion 2 on the leg portion 1, and is fitted and attached to the upper end of the gas cylinder 8 of the leg portion 1. Further, the seat receiving body 4 is made of aluminum die casting, and is appropriately covered with a resin cover 16. In addition, the shaft cylinder 7 of the leg portion 1 is attached to the lower pipe cover 17,
The upper pipe covers 18 cover the protrusions of the gas cylinders 8.

The seat frame 5 is for assembling the seat portion 2 and the backrest portion 3 and is attached to the leg portion 1 via the seat receiving body 4, and has a pair of left and right side-view J-shapes. The horizontal beam 20 is fixed between the horizontal straight portions of the vertical support rods 19, 19. The vertical support rod 19 and the horizontal beam 20 are made of a metal pipe, preferably a round steel pipe. A slide rod 21 elastically biased rearward is built in a straight portion of the vertical support rod 19 and a front end portion thereof protrudes forward. A guide groove 22 formed by integrally forming the vertical support rod 19 on both sides of the seat outer shell 9 is provided. The slide rod 21 is slidably inserted in the front and rear, and the protruding end of the slide rod 21 is engaged with the front end portion of the guide groove 22. In addition, the lower back outer shell 1 is provided at the curved and raised portion of the rear portion of the vertical support rod 19.
The tubular portions 23 integrally formed on both sides of the fitting 1 are fixedly fitted.

An armrest member 24 can be appropriately fixed to both sides of the lateral beam 20. Furthermore,
A rubber bellows 2 is attached to the lower end of the cylindrical portion 23 of the lower backrest 3a.
5 is attached to cover the vertical support rod 19, and the lower backrest 3
A rubber bellows 26 is attached between both ends of a and the upper backrest 3b to cover the exposed portion of the connection member 15.

Next, the details of the seat tilting device of the present invention are shown in FIG.
~ It demonstrates based on FIG. That is, according to the present invention, the transverse beam 20 of the seat frame 5 supporting the seat portion 2 is pivotally supported in the seat receiving body 4 attached to the leg portion 1 so as to be rotatable forward and backward, and at least one of front and rear sides of the transverse beam 20 is supported. A pressing portion 27 is provided on the side, and an elastic body 28 is disposed on the seat receiving body 4 corresponding to the pressing portion 27. When the seat portion 2 tilts forward or backward, the pressing portion 27 causes the elastic body to move. 28 is elastically compressed.

The lateral beam 20 is formed by crushing the central portion into a flat shape and forming the pressing portion 27 by eccentrically shaping the central portion forward and backward, in this embodiment, forward.
Circular shaft portions 29, 29 are formed on both side portions of the pressing portion 27, and both end portions 30, 30 are curved upward so that their tips are raised. Both ends of the horizontal beam 20 are flatly crushed from the left and right, and the lower surface of the straight portion of the vertical support rod 19 is welded to the tip thereof.

A mounting hole 31 into which the upper end portion of the gas cylinder 8 is fitted is formed in the seat receiving member 4, and a semicircular bearing groove 32 which is open upward on both left and right front portions of the mounting hole 31. Bearing portions 33, 33 having the above are formed, and further, a concave portion 34 into which the elastic body 28 is loosely inserted is formed at a position near the front between both bearing grooves 32, 32. In this embodiment, the shape of the elastic body 28 in plan view is circular or oval, and the shape of the recess 34 into which the elastic body 28 is loosely inserted is square. A screw hole 35 is formed before and after the bearing portion 33.
A bearing member 37 having a semi-circular bearing groove 36 that is open downward, and a through hole 38 formed at both ends thereof.
38 through which bolts 39, 39 are threadedly fitted in the screw holes 35, 35, and the transverse beam 2 is fitted in both bearing grooves 32, 36.
The shaft portion 29 of 0 is rotatably supported. At this time, when the bearing member 37 is made of aluminum die-cast as well as the seat receiving body 4, the bush 40 made of synthetic resin is provided in the bearing grooves 32, 36 so that the shaft portion 29 can rotate smoothly. It is preferable to fit in. In addition, projecting pieces 41, 41 are provided on both sides in the width direction at both ends of the bush 40, and the bearing part 33 or the bearing member 37 is sandwiched between the projecting pieces 41, 41 at the time of mounting to prevent the bushing 40 from being pulled out in the axial direction. ing.

In the present embodiment, when the seat portion 2 rotates around the shaft portion 19 of the lateral beam 20 and tilts forward, the pressing portion 27 provided forwardly on the lateral beam 20 corresponds to the lower portion thereof. The elastic body 28 is elastically compressed. When the forward tilting force on the seat portion 2 disappears, the seat portion 2 returns to its original position by the elastic restoring force of the elastic body 28.

Although not shown, if the relationship between the pressing portion 27 and the elastic body 28 is reversed, the elastic body 28 is similarly elastically compressed by the pressing portion 27 when the seat portion 2 is tilted backward. is there. Further, the pressing portions 27, 2 are provided on both front and rear sides of the lateral beam 20.
7 are provided, and the elastic bodies 28,
The elastic body 28 is elastically compressed in the same manner when the seat portion 2 is tilted either forward or backward by arranging the elastic body 28 on the seat receiving body 4.

In this embodiment, the elastic body 28 is made of rubber, but it is of course possible to use a coil spring or a spring material having an action equivalent to that of the coil spring.

An operating lever 43 for pressing the control pin 42 of the gas cylinder 8 is attached to the seat receiving body 4 by a lever receiving 44 in order to adjust the height of the seat 2.

[0024]

According to the seat tilting device of the present invention as described above, the lateral beam of the seat frame supporting the seat is pivotally supported by the seat receiver attached to the leg so as to be rotatable forward and backward. A pressing portion is provided on at least one of the front and rear sides of the lateral beam, and an elastic body is arranged on a seat receiving body corresponding to the pressing portion, and when the seat portion tilts forward or backward, the pressing portion Since the elastic body is elastically compressed, the seat portion can be tilted against the elastic force with an extremely simple mechanism, and its structure and assembly are simple and inexpensive.

Further, when the rubber elastic body is loosely inserted in the concave portion provided in the seat receiving body, the assembling is further facilitated and no metallic noise or rattling occurs when the seat portion is tilted.

Further, when the lateral beam is made of a metal pipe and a part of the beam is flattened to form the pressing portion, the number of parts is small and the cost is further reduced.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a chair according to the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a partially exploded perspective view showing a main part of the present invention.

FIG. 4 is a partial plan view of the same assembled state.

5 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

1 leg 2 seats 3 backrest 3a Lower backrest 3b Upper backrest 4 seat receiver 5 seat frame 6 support legs 7-axis cylinder 8 gas cylinders 9 seat outer shell 10 seat inner shell 11 Lower back outer shell 12 Lower back inner shell 13 Upper back outer shell 14 Upper back inner shell 15 Connection member 16 resin cover 17 Lower pipe cover 18 Upper pipe cover 19 Vertical support rod 20 horizontal beams 21 slide rod 22 Guide groove 23 Tube 24 Armrest member 25,26 bellows 27 Pressing part 28 Elastic body 29 Shaft 30 edge 31 mounting holes 32 bearing groove 33 Bearing 34 recess 35 screw holes 36 Bearing groove 37 Bearing member 38 through holes 39 volts 40 bush 41 Projection 42 Control pin 43 Operation lever 44 Lever holder

─────────────────────────────────────────────────── ───Continued from the front page (56) Reference JP-A-59-228807 (JP, A) JP-A-7-265161 (JP, A) JP-A-7-51144 (JP, A) Actual development Sho-63- 148244 (JP, U) Actual development Sho 52-4010 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47C 3/026 A47C 7/14

Claims (3)

(57) [Claims] 1. A seat support attached to a leg portion pivotally supports a transverse beam of a seat frame supporting the seat portion so as to be rotatable forward and backward, and a pressing portion is provided on at least one of front and rear sides of the transverse beam. At the same time, an elastic body is arranged on the seat receiving body corresponding to the pressing portion,
A seat tilting device for a chair, wherein an elastic body is elastically compressed by the pressing portion when the seat tilts forward or backward. 2. The seat tilting device according to claim 1, wherein a rubber elastic body is loosely inserted into a recess provided in the seat receiving body. 3. The horizontal beam is made of metal pipe,
3. The seat tilting device for a chair according to claim 1, wherein a part of the flat part is processed to form the pressing portion.