| 摘要 |
<p>The purpose of the present invention is to provide a cushion for a chair, which is difficult to press the hips of a sitter, is easy to maintain a posture precisely, and makes the sitter breathe easily. The cushion for the chair has a seat part and a back part. Two hipbone parts of the seat part in which the hipbone of the sitter meets have a three dimensional curved surface shape where a left and right direction longitudinal section is curved in a concave form, and a front and rear direction longitudinal section inclines toward the surface along the rear side, and have a three dimensional curve surface where a left and right direction cross section is curved in a concave form on upper edge parts of the ilium of the back part in which the ilium of the sitter meets, and a left and right direction cross section is curved in a concave form on lower lib parts of the back part in which the lower ribs of the sitter meet, and the left and right direction cross section of upper parts than the lower lib parts is curved in a concave form, and an upper and lower direction longitudinal direction inclines toward the back side along the upper parts.</p> |
