| 摘要 |
PROBLEM TO BE SOLVED: To provide a seat whose outer shape can be adjusted and to provide, particularly in a seat of an automobile, a simple outer shape adjusting system. SOLUTION: A backrest 10 and a forward curved region wherein air cushions 11, 12 which are disposed on the upper and lower sides respectively to form a forward curved outer shape are provided. A control device 17 is provided to control the pressure charging of the air cushions. An operation unit 20 connected to the device 17 is provided to set charging pressure. In order to adjust the outer shape of the forward curved region of the backrest 10 to provide a most suitable back support which is simple and can be theoretically operated, two sets of command buttons 26, 27 are provided in the operation unit 20. If one of two command buttons being a first set of buttons is pushed, the device 17 changes the charge pressure ratio of the cushions 11, 12, and if one of the command buttons of the other set of buttons is pushed, charge pressures of the air cushions 11, 12 are simultaneously changed, while the ratio of charge pressure is not changed.
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