JP2534725Y2 - Covering device for back support rod in chair - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for attaching a cover to a backrest supporting rod in a chair having a backrest mounted on a backrest supporting rod provided near a rear portion of a seat body.

[0002]

2. Description of the Related Art When a backrest is provided on a chair, an L-shaped backrest support rod is attached to a support member provided at the upper end of the leg, and the backrest is attached to the backrest support rod. In that case, since the back support rod is formed of a metal plate due to the relationship of strength, the back support rod is covered from behind with a cover made of synthetic resin, etc., for safety and unification of colors. I have.

In this case, conventionally, a female screw hole is provided on the inner surface of the cover body, and a screw penetrating the back support rod is screwed into the female screw hole, so that the cover body is attached to the back support rod. .

[0004]

However, in the means for attaching the cover body to the back support rod with screws as described above,
It has the advantage that the cover body can be securely mounted without play, but on the other hand, the screwdriver must be turned one by one and the screws must be screwed in, so it takes time to mount the cover body. was there.

The purpose of the present invention is to solve this problem.

[0006]

In order to achieve the above object, the present invention is directed to a case where a backrest is attached to a rear portion of a seat body when viewed from the side in a side view.
In a chair comprising a metal-shaped metal back support rod and a cover body fitted to the back support rod from behind, an upper end of the cover body is engaged with an upper end edge of the back support rod from above to engage. In the meantime, a downward hook-shaped upper locking claw is provided, and at least a front portion of the backrest supporting rod is provided with a pair of left and right side plates constituting left and right outer surfaces of the backrest supporting rod. The upper surfaces of the front portions of the left and right side plates are formed on inclined surfaces inclined obliquely downward toward the front of the chair. A pair of inward hook-shaped lower locking claws are provided so as to engage with the inclined surfaces of the left and right side plates by deforming outwardly against its elasticity.

[0007]

With this configuration, first, the upper locking claw of the cover body is dropped into and engaged with the upper end edge of the back support rod, and then the cover body is turned around the upper locking claw. While moving the lower and right lower locking claws outward, the cover body is fitted into the back support rod, and the left and right locking claws are restored by their elastic restoring force. The cover can be attached to the back support rod by a one-touch operation of contacting the inclined surface of the plate.

When the cover body is mounted, the hook-shaped upper locking claw rests on the back body with its inner surface in contact with the lower surface of the horizontal portion and the back surface of the vertical portion of the back support rod. Because the upper end of the cover is engaged with the upper end of the support rod from above, the upper part of the cover body is held so as not to be displaced in both the downward and rearward directions. Since the front portion of the cover body is engaged with the inclined portion of the backrest support rod, the front portion of the cover body is also held so as not to be displaced in both the backward and downward directions. In this way, the cover body is supported by its upper end and front end. Since the cover body is held so as not to be displaced rearward and downward with respect to the support rod, the cover body is held as a whole without rattling.

Therefore, according to the present invention, the cover body can be securely attached to the back support rod without any backlash, and the cover body can be attached in a one-touch manner, thereby assembling the chair. This has the effect of improving work efficiency.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a leg to which the cover cylinder 1a is fixed, reference numeral 2 denotes a seat body, and reference numeral 3 denotes a backrest in which a cushion material 3b is stretched on a synthetic resin shell-like substrate 3a.

A pair of left and right side plates 4 is provided on the upper end of the leg 1.
a, 4a, while the upper support member 4 is fitted thereto,
The lower support member 5 which is open upward is fixed to the upper end of the cover cylinder 1a, and these upper and lower support members 4 and 5 are integrally fixed at a portion near the front end thereof and formed on the upper surface of the upper support member 4. The seat 2 is fixed to the support piece 4b.

Reference numeral 6 denotes a back support rod made of a metal plate and formed in an L-shape when viewed from the side.
A pair of left and right side plates 7, 7 extending in connection with the horizontal portion 6a and the vertical portion 6b is formed to have a substantially U-shaped cross section, and a portion of the horizontal portion 6a near the front end of the left and right side plates 7, 7 is provided. Is pivotally connected to the upper support member 4 by a horizontal support shaft 8, and further, one end of a gas cylinder 10 is rotatably supported by a support pin 9 mounted between the tips of the left and right side plates 7, 7. ,
The other end of the gas cylinder 10 is supported on the front end of the lower support member 5 by a shaft (not shown), and the substrate 3a of the backrest 3 is screwed on the front surface of the vertical portion 6b of the backrest support rod 6 (not shown). )).

At this time, the upper surfaces of the front portions of the left and right side plates 7, 7 of the back support rod 6 are formed as inclined surfaces 7a, 7a extending obliquely downward toward the front of the chair. In addition,
At a substantially intermediate portion along the width direction of the back support rod 6,
Reinforcing ridges 6a are formed to extend in the longitudinal direction. Reference numeral 11 denotes a synthetic resin cover that is fitted to the back support rod 6 from behind. The cover body 11 has an overall width dimension larger than that of the back support rod 6, and has reinforcing ribs 11a provided on its inner surface in multiple stages along the up-down direction and the front-rear direction. An engaging groove 12 is formed in 11a so as to fit tightly on the back support rod 6, so that the cover body 11 can be fitted to the back support rod 6 in the left-right direction without rattling. .

At the upper end of the cover body 11, two upper locking claws 13, 13 which are fitted to and engaged with the upper end edge of the back support rod 6 from above, are provided at appropriate distances on the left and right. At the front end of the body 11, a pair of left and right lower locking claws 14, 14 formed in an inward hook shape so as to contact the inclined surfaces 7a, 7a of the left and right side plates 7, 7 of the backrest support rod 6, protrude. The left and right locking claws 14 and 14 are configured to bend and deform toward the left and right outer sides against their elasticity.

In the above configuration, with the back support rod 6 attached to the upper support member 4, as shown in FIG. 7, the cover body 11 is fitted with only its upper part on the upper part of the back support rod 6. To move the lower locking claw 13 into engagement with the upper edge of the back support rod 6,
As shown by the arrow in FIG. 8, the lower part of the cover body 11 is pushed toward the backrest support rod 6, and the left and right lower locking claws 14,
14 is temporarily deformed outward as indicated by a dashed line in FIG. 6 and then returned to the original state by an elastic restoring force. The cover body 11 can be attached to the back support rod 6 by a one-touch operation of engaging with the inclined surfaces 7a, 7a of the side plates 7, 7.

In this mounted state, the cover body 11 is moved rearward and downward at the upper portion by the upper locking claw 13 being engaged with the upper end edge of the back support rod 6 from above. The cover body 11 is held so as not to be displaced, and the left and right lower locking claws 14, 14 are engaged with the inclined surfaces 7 a, 7 a of the left and right side plates 7, 7 of the backrest support rod 6 from outside. Even at the front part, the cover body 11 is held so as not to be displaced in both the rearward and downward directions, so that the cover body 11 is firmly attached as a whole without play.

In the above embodiment, the back support rod is configured to be tiltable rearward. However, the present invention can be applied to a case where the back support rod is fixed to the lower surface of the seat plate or the support member. it can. Further, in the above embodiment, the backrest support rod is constituted by one member. However, the backrest support rod may be constituted by a plurality of members arranged in the left-right direction of the chair. In this case, side plates may be formed on the left and right outer portions of the back support rod formed of a plurality of members, and the lower locking claws of the cover may be engaged with the side plates.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a cover and a back support rod.

FIG. 2 is a right side view of a rear portion of the chair.

FIG. 3 is a longitudinal sectional side view of a rear portion of the chair.

4 is a sectional view taken along line IV-IV of FIG. 3 in a state where a backrest is omitted.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 3;

FIG. 7 is a diagram showing a procedure for attaching a cover body.

FIG. 8 is a diagram showing a procedure for attaching a cover body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leg 3 Backrest 6 Backrest support rod 7 Side plate of backrest support rod 7a Inclined surface 11 Cover body 13 Upper locking claw 14 Lower locking claw

Claims (1)

(57) [Scope of request for utility model registration] 1. A chair comprising: a metal backrest supporting rod having a substantially L-shaped side view to which a backrest is attached at a rear portion of a seat body; and a cover body fitted to the backrest supporting rod from behind.
At the upper end of the cover body, a downward hook-shaped upper locking claw fitted and engaged with the upper end edge of the back support rod from above is provided, and at least the front part of the back support rod is A pair of left and right side plates constituting left and right outer surfaces of the back support rod are provided, and front upper surfaces of the left and right side plates of the back support rod are formed on inclined surfaces that are inclined obliquely downward toward the front of the chair. At the left and right ends of the front part, a pair of left and right inward hook-shaped lower locking claws with respect to the inclined surfaces of the left and right side plates of the backrest support rod are deformed outward against their elasticity, thereby forming the left and right sides. A cover device for a back support rod in a chair, wherein the cover device is provided so as to engage with the inclined surfaces of both side plates.