JPH0824070A - Back rest tilting device for chair - Google Patents

Abstract

PURPOSE:To provide a back rest tilting device which has resistance force to backward tilting of a back rest plate and is simple and inexpensive for a chair of a simple type having plural fixing and supporting legs for supporting a seat part. CONSTITUTION:The chair which has the plural fixing and supporting legs 2 parted in order to support the seat part 1 and has the elastic resistance to backward tilting of the back rest plate 3 is pivotally mounted with the intermediate part of a back rest rod 4 having the back rest plate in the upper part tiltably forward and backward of the seat. A front end 7 of the back rest plate extending downward of the seat part from a pivotal fitting part 6 is detained to an elastic member 5 which is spanned between the supporting legs and has an elastic recovering property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest tilting device for a chair, and more particularly, it has a plurality of spaced support legs for supporting a seat portion, and has an elastic resistance force against the rearward tilting of the backrest plate. The present invention relates to a backrest tilting device for a chair.

[0002]

2. Description of the Related Art A conventional backrest tilting device for a chair pivotally attaches a tip portion extending below a backrest rod to a seat receiver of a seat, and compresses the backrest rod and the seat receiver. A structure in which a coil spring is interposed is extremely common, and in this case, when the backrest plate attached to the upper part of the backrest rod leans against the backrest plate,
Since the compression coil spring is elastically compressed, the compression coil spring has a resistance force against the rearward inclination of the backrest plate.

There is also provided a backrest tilting device for a chair having a structure in which the backrest rod itself is elastically bent by an elastic member provided therein.

However, the backrest tilting device having the above structure is
All of them have complicated structures and are relatively expensive, and are mainly used in swivel chairs. The chairs according to the present invention, that is, a simple structure including a plurality of fixed support legs for supporting a seat portion, are provided. It is not used for type chairs.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is to solve the problems in a simple chair having a plurality of fixed supporting legs for supporting a seat portion, by a backrest plate. An object is to provide a simple and inexpensive backrest tilting device having resistance to tilting.

[0006]

In order to solve the above-mentioned problems, the present invention provides a chair having a plurality of fixed supporting legs spaced apart for supporting a seat portion and having an elastic resistance force against a rearward tilt of a backrest plate. In addition, while an intermediate portion of the backrest rod having a backrest plate on the upper portion is pivotally attached to the rear portion of the seat portion so as to be tiltable back and forth,
A backrest tilting device for a chair is constructed by attaching a tip end portion of a backrest rod extending below the seat portion from the pivotal attachment portion to an elastic member having elasticity restoring property provided between the support legs.

Here, the seat portion is formed of a seat plate and a seat frame supporting the seat plate, and a middle portion of the backrest rod is pivoted on a lateral rod of the seat frame exposed at a rear portion of the seat plate. It is preferably worn.

The tip end portion of the backrest rod is attached to the central portion of the elastic member provided between the rear supporting legs, and the central portion of the elastic member provided between the front supporting legs is attached. That is, it is a preferred embodiment that the elastic member provided between the lateral supporting rods fixed between the front supporting leg and the rear supporting leg on both sides is engaged with the central portion of the elastic member.

[0009]

In the chair backrest tilting device of the present invention having the above contents, when the backrest plate provided on the upper part of the backrest rod leans against the backrest plate, the backrest rod having the intermediate portion pivotally attached to the rear portion of the seat portion is , The upper part tilts backward around the pivotal part, and the lower part tilts forward or upward, flexibly deforms the elastic member attached to its tip, and the elastic restoring force of this elastic member is backed. It is a resistance against the backward tilt of the plate.

[0010]

The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. 1 to 3 show a first embodiment of a chair according to the present invention, in which 1 is a seat portion, 2 is a support leg, 3 is a backrest plate, 4 is a backrest rod, and 5 is an elastic member, respectively. There is.

The present invention is a chair having a plurality of fixed support legs 2, ... For supporting the seat portion 1 and having an elastic resistance against the rearward leaning of the backrest plate 3, and a backrest plate at the upper part. An intermediate portion of a backrest rod 4 having 3 is pivotally attached to a rear portion of the seat portion 1 so as to be capable of tilting forward and backward, and a tip portion 7 of the backrest rod 4 extending below the seat portion 1 from the pivotal attachment portion 6 is described above. The gist of the present invention is that it is attached to an elastic member 5 provided between the supporting legs 2 and 2 and having an elastic restoring property.

In the chair according to the present invention, a plurality of support legs 2, ... Are provided at the four corners of the lower surface of the seat 1, and the seat 1 includes a seat plate 8 and a seat frame 9 supporting the seat plate 8. An intermediate portion of the backrest rod 4 is pivotally attached to a lateral rod 10 of a seat frame 9 formed on the rear portion of the seat plate 8 so as to be tiltable in the front-back direction. Here, of the supporting legs 2, the front supporting leg is 2a and the rear supporting leg is 2b.

In the present embodiment, the backrest rod 4 is a substantially linear rigid body, and the tip portion 7 below the backrest rod 4 has both rear support legs 2.
It is attached to the central portion of a rod-shaped elastic member 5 made of spring steel provided between the upper and lower intermediate portions of b and 2b. Here, as shown in FIG. 3, when the backrest plate 3 leans against the backrest, the upper part of the backrest rod 4 is tilted rearward, and the lower tip part 7 is moved forward or upward. Then, the elastic member 5 is flexibly deformed, but both ends of the elastic member 5 are pulled inward when the elastic member 5 is bent, so that both ends or at least one end of the elastic member 5 must be slidably mounted on the rear support leg 2b. There is.

Therefore, in this embodiment, as shown in FIG. 4, both ends of the elastic member 5 are connected to the pipe-shaped rear support legs 2b, 2b.
through holes 11, 11 formed on the inner sides of b, facing each other
And the retaining portion 12 provided at the end of the elastic member 5 is positioned in the internal space of the rear support leg 2b. In practice, the retaining portion 12 is fixed to the end of the elastic member 5 and the through hole 11
Since the elongated retaining portion 12 is rotatably attached to the end portion of the elastic member 5, the through-hole 11 with the direction of the retaining portion 12 and the longitudinal direction of the elastic member 5 is aligned. After the insertion, the direction of the retaining portion 12 is perpendicular to the longitudinal direction of the elastic member 5. Alternatively, as shown in FIG. 5, a barbed spring piece 13,
When fixing 13 and inserting it into the through hole 11 of the rear support leg 2b, the spring pieces 13 and 13 are compressed and passed through the through hole 11, and after the passage, the spring pieces 13 and 13 are elastically restored so that the pipe-shaped rear It is adapted to be locked to the inner surface of the supporting leg 2b.

In this embodiment, one elastic member 5 is used. However, two elastic members 5 are used, and two elastic members 5 are used in a stepwise manner with respect to the rearward inclination angle of the backrest plate 3. If the elastic member 5 is configured to bend and deform, the backrest plate 3 can have a weak resistance force in the initial stage of the rearward tilt and a strong resistance force in the latter period of the rearward tilt.

FIG. 6 shows a modification of the first embodiment, in which the backrest rod 4 has a Y-shape, and the backrest rod 4 comprises a pair of substantially parallel backrest supports. Rod 14,1
The lower end of 4 is integrally connected by a connecting rod 15, and the connecting rod 1
5, the operating rod 16 is formed integrally and continuously,
The center of the elastic member 5 in which the lower portions of both backrest supporting rods 14, 14 are pivotally attached to the lateral rod 10 of the seat frame 9 and the tip end portion 7 of the operating rod 16 is provided between the rear supporting legs 2b, 2b in the same manner as described above. It is a member of the club. Since other configurations are the same as the above,
The same components are designated by the same reference numerals and the description thereof will be omitted.

FIG. 7 shows a second embodiment of the present invention, in which the lower part of the backrest rod 4 is curved and extended from the lower part of the seat part 1 to the front part from the pivotal part 6, and the tip part 7 thereof is connected to the front support leg. The elastic member 5 is attached to the central portion of the elastic members 5 provided at the upper and lower intermediate portions of the 2a and 2a. Since other configurations are the same as those described above, the same components are designated by the same reference numerals and the description thereof will be omitted.

FIG. 8 shows a third embodiment of the present invention in which the lower part of the backrest rod 4 extends from the lower part of the seat part 1 to the central part of the seat part 1 from the pivotal part 6, and the tip parts 7 thereof are located at the front support legs on both sides. 2a and rear support leg 2b
The elastic member 5 provided between the lateral reinforcing rods 17 fixed between the elastic members 5 is engaged with the central portion of the elastic member 5. Since other configurations are the same as those described above, the same components are designated by the same reference numerals and the description thereof will be omitted.

When the seated person leans against the backrest plate 3, the upper part of the backrest rod 4 having the middle portion pivotally attached to the rear portion of the seat portion 1 tilts backward around the pivotal portion 6, and The lower part tilts forward or upward and flexes and deforms the elastic member 5 attached to the tip portion 7 thereof, and the elastic restoring force of the elastic member 5 imparts a resistance force to the rearward tilt of the backrest plate 3. Is done. Except for the rearward tilt load applied to the backrest plate 3,
The backrest plate 3 and the backrest rod 4 return to the initial state by the elastic restoring force of the elastic member 5.

[0020]

As described above, the chair backrest tilting device of the present invention is a chair having a plurality of fixed supporting legs spaced apart for supporting the seat portion and having an elastic resistance against the backward tilting of the backrest plate. There, the middle part of the backrest rod having a backrest plate on the upper part is pivotally attached to the rear part of the seat part so as to be able to tilt back and forth, and the tip part of the backrest bar extending below the seat part from the pivot part is attached. Since it is attached to the elastic member having elasticity restoring property which is provided between the supporting legs, the simple chair having the fixed supporting legs can resist the rearward tilt of the backrest plate and can be easily deformed by bending the elastic member. It can be added by a mechanism, so that a highly functional and inexpensive chair can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a chair equipped with a backrest tilting device according to a first embodiment of the present invention viewed from the front side.

FIG. 2 is a perspective view of the same seen from the rear side.

FIG. 3 is a side view of the chair showing a state in which the backrest plate is tilted backward.

FIG. 4 is a main-portion cross-sectional view showing an example of a mounting structure of an elastic member and a supporting leg.

FIG. 5 is a main-portion cross-sectional view showing another example of a mounting structure of an elastic member and a supporting leg.

FIG. 6 is a perspective view of a chair showing a modified example of the first embodiment.

FIG. 7 is a side view of the chair showing the second embodiment.

FIG. 8 is a side view of the chair showing the third embodiment.

[Explanation of symbols]

 1 seat part 2 support leg 2a front support leg 2b rear support leg 3 backrest plate 4 backrest rod 5 elastic member 6 pivotal attachment part 7 tip part 8 seat plate 9 seat frame 10 lateral rod 11 through hole 12 slip-out part 13 spring piece (slip-out part) ) 14 backrest supporting rod 15 connecting rod 16 operating rod 17 lateral reinforcing rod

Claims (5)

[Claims] 1. A chair having a plurality of fixed support legs spaced apart for supporting a seat portion and having an elastic resistance against backward tilting of a backrest plate, the middle of the backrest rod having a backrest plate at an upper portion thereof. Part is pivotally attached to the rear part of the seat part so as to be able to tilt back and forth, and the tip end of the backrest rod extending from the pivotal part to the lower part of the seat part is provided on the elastic member having elasticity restoring property between the supporting legs. A backrest tilting device for a chair, which is characterized by being engaged. 2. The seat portion is formed by a seat plate and a seat frame supporting the seat plate, and an intermediate portion of the backrest rod is pivotally attached to a lateral rod of the seat frame exposed at a rear portion of the seat plate. A backrest tilting device for a chair according to claim 1. 3. The backrest tilting device for a chair according to claim 1, wherein a tip end portion of the backrest rod is attached to a central portion of an elastic member provided between the rear supporting legs. 4. The backrest tilting device for a chair according to claim 1, wherein a tip end portion of the backrest rod is attached to a central portion of an elastic member provided between the front supporting legs. 5. A front end portion of the backrest rod is attached to a central portion of an elastic member provided between the lateral reinforcing rods fixed between the front support leg and the rear support leg on both sides. The backrest tilting device of the described chair.