Back core material structure for chair

Abstract

Provided is a back part core material structure of a chair with durability in which the load concentration of a specified part within the surface of a planar member is avoided and cracks or the like in a core material constituting the back part of the chair is avoided as a result. The core material 20 is provided with: the planar member 21 where a connection part 24 for connecting the upper end part of a support leg 11 is formed on both right and left sides; and a reinforcing part 22 arranged within the surface of the planar member 21. The reinforcing part 22 includes an outer side reinforcing part 22A extended from the upper end part of the connection part around the upper outer edge side of the planar member, an inner side reinforcing part 22B along the inner side of the connection part and an extension reinforcing part 22E positioned on the upper extension line of the inner side reinforcing part 22B. Further, a rib 25 is provided between the outer side reinforcing part 22A and the extension reinforcing part 22E.

Description

technical field [0001] The present invention relates to a back core structure of a chair, and more particularly, to a chair back core structure capable of improving the durability of the chair when a load is applied due to a person sitting on the chair leaning backward. Background technique [0002] In the prior art, a so-called synthetic resin plate-shaped member called an inner shell is used as a core material, and a cushioning material such as polyurethane is sandwiched between a cushioning material such as polyurethane on the outer surface side of the core material. Backs of chairs formed by covering with leather surface members are well known. [0003] FIG. 6 shows a schematic perspective view of a conventional core material constituting the back of a chair viewed from the back side. In this figure, the core material 50 integrally formed from a synthetic resin material is composed of a planar plate-shaped member 51 that can support the middle region of the back from th...

AI Technical Summary

Problems solved by technology

[0006] Using the back of the chair comprising the above-mentioned core material 50, in addition to providing suitable cushioning for the occupant, can also provide a certain rigidity by means of the reinforcement part 52, but there is a problem that the occupant will lean backward. The tendency of the load to be strengthened in the area centered on the above-mentioned intermediate reinforcement portion 52C causes the problem of cracking of the core material in this area.

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