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.COPYRIGHT: (C)2013,JPO&INPIT【課題】一端部を密閉されたパイプ状をなす外筒と、この外筒内に上下スライド可能に嵌め合わされる内部材とを利用している昇降装置において、上側に配した部材がその可動範囲の下端に達した際の衝撃の発生を抑制する装置を提供する。【解決手段】一端部を密閉されたパイプ状をなす外筒たる下部要素21と、この下部要素21の他端側から該下部要素21に上下スライド可能に挿入される内部材たる上部要素22と、この上部要素22の挿入端に設けられ空気の流量の制御を行う流量制御弁25とを備え、前記流量制御弁25が、前記上部要素22の挿入端側に前記下部要素21との間に隙間を形成した状態で設けられる弁座26と、下部要素21の内面21bに密着し、弁座26に着座して上下方向の空気の流れを抑制する閉弁位置Sと弁座26から離間し上下方向の空気の流れを許可する開弁位置Oとの間で移動可能な環状弁体27とを備えている昇降装置Lを設ける。【選択図】図10
