JP2598744Y2 - Chair backrest support - 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 and, more particularly, to a backrest support for a chair.

[0002]

2. Description of the Related Art In general, an office chair or the like is provided with a seat plate and a backrest plate as separate members, and a damper mechanism for the backrest plate is provided to improve sitting comfort. Is configured to be movable in the front-rear direction.

Conventionally, such a chair has a backrest plate having a substantially L-shaped cross section connected and supported at the center of the bottom of the seat plate. For example, a connecting member is provided at the bottom of the seat plate at a position behind the connection point with the connection point as a fulcrum. The backrest is always pressed forward from below by pressing the backrest upward, while the backrest is elastically deformed when a rearward force is applied to the backrest to allow the backrest to move backward. It is configured with a mechanism. The damper mechanism has an elastic member made of a metal coil spring mounted between a seat plate and a backrest plate.

[0004]

However, since the elastic member is constituted by a metal coil spring in the backrest supporting portion of the above-mentioned conventional chair, a metallic sound is generated when a rearward force is applied to the backrest portion. This caused the user to feel uncomfortable and required maintenance.

The present invention has been made in view of such a conventional problem, and has as its object to provide a backrest support portion of a chair which does not generate an abnormal sound such as a metal sound and requires no maintenance. .

[0006]

According to a first aspect of the present invention, a seat plate and a back plate are provided.
The back plate is connected to a connecting member having a substantially L-shaped cross section.
And a backrest attached to the upper end of the connecting member
And supports the connecting member of the backrest plate at the center of the bottom of the seat plate
On the bottom of the seat plate behind the connection
The connecting member is pressed and urged upward from below with the
The backrest is constantly urged forward by
Elastically deforms when a rearward force is applied to the backrest
Equipped with a damper mechanism for the back plate that allows backward movement of
In the backrest support portion of the chair, the damper mechanism is provided.
Is a columnar rubber made between the bottom of the seat plate and the connecting member.
An elastic member and a flat plate portion and a flat plate that are in pressure contact with the upper end surface of the elastic member.
And continuously formed on both sides thereof, and fixed to the connecting member to
Compression force by the binding member is transmitted to the elastic member together with the flat plate
And a holding member having a press-contact receiving portion.
At the bottom of the plate, a cylinder larger in diameter than the elastic member is cut out in the axial direction.
Buckling of the elastic member by surrounding the elastic member with a curved shape
And the flat part of the holding member can be moved up and down at the notch
And a pair of guides are formed.

The invention according to claim 2 is characterized in that the seat plate bottom is provided.
A projection that fits into the center of the lower end surface of the elastic member.
Was taken.

Further, according to a third aspect of the present invention, the elastic member has a columnar shape, the pressing member is made of metal, and its flat plate portion is formed of a rectangular plate, and the press contact receiving portion has both ends of the flat plate portion stepped. Bent and formed , the pair of guides are made of synthetic resin
It was formed in a more arcuate shape .

[0009]

According to the backrest support portion of the chair of the present invention having the above structure, the elastic member constituting the damper mechanism is formed of rubber, so that no metallic noise is generated and maintenance is not required. Further, a damper mechanism is formed by a columnar rubber elastic member elastically mounted between the bottom portion of the seat plate and the connecting member, a flat plate portion pressed against the upper end surface of the elastic member and continuously formed on both sides thereof, and fixed to the connecting member. from what has been composed of a pressing member that the pressure contact force by the connecting member having a pressure receiving portion capable of transmitting the elastic member I flat plate portion coupled with is, contact pressure against the resilient member will be applied to more uniform. Furthermore, before
At the bottom of the seat plate, cut a cylinder larger in diameter than the elastic member in the axial direction.
Surround the elastic member with the chipped shape to control the buckling of the elastic member.
The flat part of the holding member can be moved up and down at the notch.
Since a pair of guides is formed to guide the
When the material is deformed, the pair of guides prevent the buckling of the elastic member.
The deformation stroke of the elastic member.
The flexibility of material selection for elastic members is expanded.
You.

In addition, the lower end of the elastic member is provided at the bottom of the seat plate.
In the case of forming a projection that fits in the center of the surface, the elastic member
When the shape is deformed, the protrusion can prevent displacement of the shaft center position.
Therefore, it is possible to easily secure the appropriate deformation form during use.
Wear.

Furthermore, the elastic member is a cylindrical shape, the flat plate portion pressing member made of metal and formed from a strip plate, and the pressure receiving portion formed by bending both ends of the flat plate portion stepped, the
When formed in a circular arc shape by a pair of guide synthetic resin, pressing force is more evenly ing against the elastic member. In this case, the holding member is made of metal and has excellent rigidity and durability. On the other hand, since the pair of guides for guiding the holding member is made of synthetic resin, no metal noise is generated.

[0012]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are longitudinal sectional views of a main part showing a backrest support portion of a chair according to the present embodiment.
FIG. 3 is an exploded perspective view from above, an exploded perspective view from below, and a side view showing the entire chair.

As shown in FIG. 4, the chair in this embodiment has a leg 2 with a caster 1, a seat plate 3 attached to the upper end of the leg 2, and an L-shaped section attached to the seat plate 3. The seat plate 3 is composed of a seat plate bottom 5 and a seat plate cushion 6 provided on the upper surface thereof. The back plate 4 is a connecting member 7 having one end attached to the seat plate bottom 5. And a backrest 8 attached to the upper end of the connecting member 7.

The seat plate bottom 5 of the seat plate 3 is formed of a synthetic resin. As shown in FIG. 2, the outer surface portion 9 is formed to be thick, and a large number of ribs 10 are formed in a matrix inside thereof. Is formed. Reference numeral 11 denotes a cylindrical mounting portion provided at the center of the seat plate bottom 5 for mounting the leg 2. Also,
As shown in FIG. 3, on the lower surface 12 of the seat plate bottom 5, a portion 13 of the back plate 4 to which the connecting member 7 is attached (a portion on the rear side from the center of the seat plate bottom 5) 13 is formed to be raised.

The connecting member 7 of the backrest plate 4 is made of a synthetic resin and has a substantially L-shaped cross section. The front end of the seat plate 3 mounting side is bifurcated to form two connecting support arms 14. I have.
As shown in FIG. 3, the connecting member 7 is rotated on the lower surface 12 of the seat plate 3 substantially at the center of the seat plate bottom 5 by a connecting arm 14 and a bolt 15 and a nut 16 penetrating the seat plate bottom 5. It is freely connected and supported. 17 and 18 are caps for covering the head of the bolt 15 and the nut 16, respectively.

The backrest 8 is always pushed forward from the bottom of the seat plate bottom 5 at the rear of the connection point by pressing the connection member 7 upward from below with the connection point as a fulcrum (the right side in FIG. 4). Direction), and when a back force is applied to the backrest 8, the backrest 8 is elastically deformed.
There is provided a damper mechanism for the backrest plate 4 that allows the rearward movement of the backrest. In this embodiment, this damper mechanism
The elastic member 19 includes a cylindrical rubber elastic member 19 and a metal pressing member 20 pressed against the elastic member 19.

As shown in FIG. 2, the pressing member 20 is a flat plate portion 2 that presses the center of the strip to the upper end surface of the elastic member 19.
1, and a long hole 22 is formed at the center thereof. Also,
On both long sides of the flat plate portion 21, small sliding surface portions 23 bent upward are formed. Further, press contact receiving portions 24 are formed at both ends in the longitudinal direction of the pressing member 20 and are bent in a step-like manner so as to be continuous with the flat plate portion 21.
As shown in FIG. 1, the press contact receiving portion 24 is
Is fixed to the lower surface of the connecting arm 14 and receives the pressing force of the connecting member 7, and transmits the pressing force to the elastic member 19 together with the flat plate portion 21.

On the other hand, as shown in FIGS. 1, 3 and 4, a cylindrical concave portion 25 for accommodating the elastic member 19 is formed in the bottom portion 5 of the seat plate. A projection 26 is formed at the center of the recess 25 so as to fit into the center of the lower end surface of the elastic member 19. Further, a pair of arc-shaped guides 27 surrounding the elastic member 19 are formed in the concave portion 25 so as to surround the elastic member 19 in a shape in which a cylinder having a larger diameter than the elastic member 19 is cut in the axial direction. The arc-shaped guide 27 is made of a synthetic resin and is formed integrally with the seat plate bottom 5. Circular guide 27
Restricts the buckling of the elastic member 19 when the elastic member 19 is contracted by the pressing force, and the pressing member 2 is formed at a notch portion between the two arc-shaped guides 27, that is, at a side portion 27a of the arc-shaped guide 27.
The vertical movement of the holding member 20 can be guided while sliding the sliding surface portion 23 of No. 0.

According to the backrest plate 4 supporting portion having such a configuration, the connecting member 7 is pressed and urged upward from below by the elastic member 19 with the connecting point between the backrest plate 4 and the seat plate 3 as a fulcrum. Thereby, the backrest portion 8 of the backrest plate 4 is constantly urged forward.

On the other hand, when a rearward force is applied to the backrest 8, a downward pressing force is applied to the connecting member 7, and the pressing member 20 descends while being guided by the arcuate guide 27, and the pressing force is reduced by the pressing member 20. Press receiving portion 24 and flat plate portion 2
1 to the elastic member 19. Moreover, the elastic part
The pressing force against the material 19 is uniform. As a result, the elastic member 19 is elastically deformed and contracted, thereby allowing the backrest 8 to move backward. At this time, the elastic member 19 is circular.
Buckling is regulated by the arc-shaped guide 27. Also, holding member
20 moves up and down between the two arc-shaped guides 27.
The elastic member 19 must have a long deformation stroke.
Can be. Therefore, the material selection in the elastic member 19
The freedom of choice is wide. In addition, since the projection 26 is provided in the concave portion 25 of the seat plate bottom 5, the axis of the elastic member 19 does not shift. Therefore, even a simple structure is suitable.
A positive deformation can be easily secured. Further, the elastic member 1
Numeral 9 is made of rubber, and since other members do not slide with each other, no unpleasant metal noise is generated and no maintenance is required.

[0021]

As described above, according to the backrest support portion of the chair of the present invention, since the elastic member constituting the damper mechanism is formed of rubber, no metal noise is generated.
Maintenance is not required. In addition, when the elastic member is deformed
Has a pair of guides to prevent buckling of the elastic member.
Therefore, the deformation stroke of the elastic member can be lengthened,
The flexibility of material selection for the elastic member is increased.

The center of the lower end surface of the elastic member is provided at the bottom of the seat plate.
The elastic member is deformed when the protrusion is formed
The projection can prevent the misalignment of the shaft center when
Therefore, it is possible to easily secure the appropriate deformation form during use.
You.

Furthermore, the elastic member is a cylindrical shape, the flat plate portion pressing member made of metal and formed from a strip plate, and the pressure receiving portion formed by bending both ends of the flat plate portion stepped, the
When formed in a circular arc shape by a pair of guide synthetic resin, pressing force is more evenly ing against the elastic member. In this case, the holding member is made of metal and has excellent rigidity and durability. On the other hand, since the pair of guides for guiding the holding member is made of synthetic resin, no metal noise is generated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a backrest plate supporting portion according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a backrest plate supporting portion of the embodiment from above.

FIG. 3 is an exploded perspective view from below showing a backrest plate support of the embodiment.

FIG. 4 is a side view showing the chair of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 seat plate 4 backrest plate 5 seat plate bottom 7 connecting member 8 backrest portion 14 connecting arm 19 elastic member 20 pressing member 21 flat plate portion 24 press-contact receiving portion 26 protrusion 27 arc-shaped guide

Claims (3)

(57) [Scope of request for utility model registration] (1) A seat plate and a back plate are provided,
The back plate is formed of a connecting member having a substantially L-shaped cross section and the connecting member.
It consists of a backrest attached to the upper end,
Connects and supports the connecting member of the back plate at the center, and
On the bottom of the seat plate at a position behind the
The back member is pressed and urged upward from the lower side.
The back part is always urged forward, while the back part
Is elastically deformed to allow the backrest to move backward.
Chair with damper mechanism for back plate
The damper mechanism is provided between the bottom of the seat plate and the connecting member.
Elastic member made of columnar rubber and the upper end surface of this elastic member
It is formed continuously on the flat plate part pressed against
The pressure contact force of the connecting member is fixed to the member and
Member having a press contact receiving portion capable of transmitting the elastic member to the elastic member
A cylinder having a diameter larger than that of the elastic member
Surrounds the elastic member with a
The buckling of the member is restricted, and the flatness of the holding member is
A backrest plate support portion for a chair, wherein a pair of guides for guiding the plate portion so as to be vertically movable is formed . 2. The lower end surface center of an elastic member is provided at the bottom of the seat plate.
A projection formed to fit into the portion is formed.
2. The backrest support portion of the chair according to 1 . Wherein said elastic member has a cylindrical shape, the flat plate portion pressing member made of metal consists of a strip plate, and pressure receiving portion is formed by bending both ends of the flat plate portion stepped, the
3. The backrest support portion of a chair according to claim 1, wherein the pair of guides are formed in an arc shape by a synthetic resin .