JPH0642517Y2 - Chair back plate mounting device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching a backrest plate to an upper part of a back rod which stands up from a lower part of a seat plate of a chair to a rear upper direction.

[0002]

2. Description of the Related Art Conventionally, as in Japanese Utility Model Laid-Open No. 60-54449 shown in FIG. 4, a metallic support nut (02) is embedded in a backrest plate (01) made of a synthetic resin material, and a backrest plate (01 The set screw (03) extending from the rear of () was screwed to the nut (02), and the back rod (04) was fixed to the backrest plate (01).

However, in this prior art, the backrest plate (01)
After setting the nut (02) in the molding die of, the backrest plate (0
Since 1) is integrally molded, the molding work is troublesome and time consuming, and in order to shorten the setting time of the nut (02), a large amount of capital investment such as using a robot is required.

Further, structurally, a large load from the backrest plate (01) is applied to the portion where the nut (02) is embedded, and not only is this portion apt to crack during use of the chair, When disposing of a chair, it is extremely difficult to separate the embedded metal nut (02).

[0005]

SUMMARY OF THE INVENTION The present invention solves the above conventional problems by fixing a backrest plate on the upper part of the back rod without using an embedded nut.

[0006]

[Problems to be Solved by the Invention] A backrest plate having a plurality of mounting holes arranged in the vertical direction and elastic engaging pieces projecting on both sides of the mounting holes and having hooks facing each other at their tips is made of a synthetic resin. With integrally molded, the mounting plate made of a steel plate having a screw hole formed at a position corresponding to the mounting hole is fastened with the hook portion of the elastic engaging piece, and the backrest plate is sandwiched between the back rod and the mounting plate.
A backrest plate attachment device for a chair that fixes the backrest plate with a set screw.

[0007]

The mounting plate is detachably locked to the backrest plate by the hook so that the mounting hole of the backrest plate and the screw hole of the mounting plate are aligned with each other. Therefore, the mounting plate can be easily attached to the backrest plate when the chair is assembled, and the mounting plate can be easily removed when the chair is discarded.

Further, the backrest plate is sandwiched between the back rod and the mounting plate,
Since the backrest plate is fixed by penetrating the set screw, local shearing force, bending moment, etc. do not occur in the backrest plate, and a crack occurs in a part of the backrest plate while using the chair. There is no such thing.

[0009]

1 to 4 show an embodiment of the present invention,
On the lower part of the front surface of the backrest plate (1), flat mounting surfaces (2) and (2) arranged in parallel vertically are formed.

The mounting surface (2) has a plurality of mounting holes (3) arranged vertically.
Is pierced to penetrate the backrest plate (1),
A plurality of pairs of elastic engagement pieces (4) (4) are vertically projected on both sides of the mounting surface (2), and the tips of the elastic engagement pieces (4) (4) are hooks facing each other. Portions (5) and (5) are formed.

Reference numeral (6) is a mounting plate made of a steel plate, and has a substantially flat surface so as to come into contact with the substantially flat mounting surface (2) of the backrest plate (1).

A plurality of recesses (7) are cut on the left and right of the mounting plate (6), and elastic engaging pieces projecting from the backrest plate (1).
It is designed to be fitted to the root of (4).

Further, a plurality of screw holes (8) (8) are formed in the upper and lower portions of the mounting plate (6), and the root portion of (4) of the elastic engaging piece of the backrest plate (1). When the recessed portion (7) of the mounting plate (6) is fitted in and the mounting plate (6) is pressed by the hook portion (5) of the elastic engagement piece (4), the screw hole (8) Mounting holes for backrest plate (1)
(3) is the same.

(9) is a back rod, and the upper end of the back rod (9) has
Mounting holes (10) corresponding to the above-mentioned mounting holes (3) and screw holes (8)
The retaining plate (11) having is fixed.

At the time of assembly, when the recessed portion (7) of the mounting plate (6) is pressed into the root portion of the elastic engagement piece (4) of the backrest plate (1) so as to be fitted, the recessed portion (7) is elastically engaged. Hook part (5) of piece (4)
After getting over, the hook part (5) presses the mounting plate (6) against the backrest plate (1).

This recess (7) has a screw hole (8) and a mounting hole (3).
It facilitates the alignment with and and controls the vertical movement of the mounting plate (6).

After that, a mounting hole for the retaining plate (11) of the back rod (9)
(10) and the mounting hole (3) of the backrest plate (1) are aligned so that the back rod (9) is brought into contact with the backrest plate (1), and the set screw (12) is inserted from the rear, Then, it is screwed into the screw hole (8) of the mounting plate (6).

The backrest plate (1) is clamped so as to be sandwiched between the mounting plate (6) and the back rod (9), and the fixing between the back rod (9) and the backrest plate (1) is completed. .

FIG. 3 shows the cover (13) and the cushion material (14).
The back cover (15) that covers the back of the back rod (9) and the backrest plate (1) is attached.
(15) and the like are appropriately omitted depending on the type of chair.

As mentioned above, the mounting plate (6) is a backrest plate.
Since the hook (5) is detachably locked to the backrest plate (1) at a position where the mounting hole (1) and the screw hole (8) coincide with each other, when the chair is discarded, the hook ( 5) Open the mounting plate (6)
Can be pulled out easily.

Further, since the mounting plate (6) is in surface contact with the flat mounting surface (2), it is less likely to be twisted or deformed even if an unreasonable force is applied.

Since the backrest plate (1) is fixed so that the backrest plate (1) is sandwiched between the backrest (9) and the mounting plate (6), the backrest plate (1) made of synthetic resin is locally attached to the backrest plate (1). Difficult to generate large shear force and bending moment.

The diameter of the backrest plate is larger than the diameter of the set screw (12).
The mounting hole (3) of (1) has a large diameter, and the set screw (12) and mounting hole
By forming a space between (3) and (3), it is possible to more effectively prevent the occurrence of cracks in the backrest plate.

[0024]

The present invention has the following effects. (a) Since the mounting plate made of steel plate can be easily removed when the chair is discarded, the synthetic resin and the metal part can be easily separated.

(B) Since metal such as nuts is not embedded in the synthetic resin, the durability of the chair is remarkably improved.

[Brief description of drawings]

FIG. 1 is an assembled / disassembled perspective view of a backrest plate and a back rod according to an embodiment.

FIG. 2 is a partially enlarged view of FIG.

3 is a cross-sectional view of the assembly of FIG. 1 when completed.

FIG. 4 is a partially cutaway front view of FIG.

FIG. 5 is a cross-sectional view of a conventional backrest plate mounting portion.

[Explanation of symbols]

 (1) Backrest plate (2) Mounting surface (3) Mounting hole (4) Elastic engagement part (5) Hook part (6) Mounting plate (7) Recessed part (8) Screw hole (9) Back rod (10) Mounting hole (11) Fastening plate (12) Set screw (13) Cover (14) Cushion material (15) Rear cover

Claims (2)

[Scope of utility model registration request] 1. A backrest plate having a plurality of mounting holes arranged in the vertical direction and elastic engagement pieces projecting on both sides of the mounting hole and having hook portions facing each other at their tips is integrally formed of synthetic resin. , A mounting plate made of a steel plate having a screw hole at a position corresponding to the mounting hole is fastened with a hook portion of an elastic engaging piece, the backrest plate is sandwiched between the back rod and the mounting plate, and the backrest plate is held with a set screw A backrest plate mounting device for a chair that is fixed. 2. The backrest plate mounting device for a chair according to claim 1, wherein recesses into which the left and right engaging pieces are fitted are cut out on both the left and right sides of the mounting plate.