| 摘要 |
PROBLEM TO BE SOLVED: To prevent a leather material from lifting, folding, or wrinkling generated even the leather material is made of one sheet, to improve an outlook, to reduce the number of parts, to improve an operation efficiency, and to prevent a side support part from give a narrow feeling to the abdominal region of a passenger depending on a physical features. SOLUTION: A side support part 22 has support brackets 24 pivotally and rotatably supported by a side frame 12b and pushing out a pad material 14b of a side part. A pair of support bracket 24 located at left side and right side, are connected at the center of rotation by a connection rod 26. An operation pin 30 engaging with the support bracket 24 is fixed to the connection rod 26. The connection rod 26 is made to rotate by pushing the operation pin 30. An operation knob 40 is mounted to the side frame 12b. An arm member 42, making the connection rod 26 rotate by pushing the operation pin 30, is mounted to the operation knob 40. A brake mechanism 50 is installed to the operation knob 40.
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