| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for suppressing an occurrence of shock when a member disposed in the upper side reaches the lower end within a movable range in a lifting/lowering device using a pipe-shaped outer cylinder with a closed one end, and an inner member vertically slidably fitted in the outer cylinder.SOLUTION: This lifting/lowering device L includes: a bottom element 21 as the pipe-shaped outer cylinder having a closed one end; a top element 22 as the inner member to be vertically slidably inserted in the bottom element 21 from the other end side of the bottom element 21; and a flow control valve 25 provided at the insertion end of the top element 22 and controlling the flow rate of air. The flow control valve 25 has a valve seat 26 that is provided at the insertion end side of the top element 22 with a gap formed towards the bottom element 21, and an annular valve element 27 that is closely stuck to the inner surface 21b of the bottom element 21 and can move between a valve closed position S in which the valve element is seated on the valve seat 26 and suppresses the vertical air flow, and a valve open position O in which the valve element is separated from the valve seat 26 and allows the vertical air flow. |
