| 摘要 |
PROBLEM TO BE SOLVED: To provide a backrest device of a chair which is capable of providing comfortableness to sit by increasing the backward flexibility of a stretching material. SOLUTION: In the backrest device of a chair where a bag like stretching material 12 opening downward is stretched across a back frame 11 formed by coupling the upper ends of right and left side frames 14a directing the vertical direction by an upper frame 14b directing the right and left direction, The stretching material on the rear side is swollen rearward by connecting intermediate parts of the side frames 14a in the vertical direction by an intermediate frame 14d having a rearward convex arcuate shape when viewed from the top. COPYRIGHT: (C)2009,JPO&INPIT
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