| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a deflection amount of a bag body as it is pressed.SOLUTION: In an air type actuator 40, a tension coil spring 60 is stretched between a movable plate 44 and a fixed plate 42, and the movable plate 44 is energized to the side of the fixed plate 42 (closing direction side). Therefore, in a state that a bladder 48 is inflated, the bladder 48 is compressed by the fixed plate 42 and the movable plate 44 because an energization force acts on the movable plate 44 in the closing direction side. This makes the air pressure in the bladder 48 relatively higher on inflation, so that a reactive force of the bladder 48 against a pressing force increases when the bladder 48 (side support part 14) is pressed. Accordingly, a deflection amount of the bladder 48 can be reduced to reduce a displacement amount of the side support part 14.</p> |
