Patent ID: 6343537
Filing Date: 2002-02-05
Classification: F15B

Abstract:
A dual stroke cylinder comprising:a cylinder body having therein a cylinder bore and a small-diameter rod hole connected to one end of said cylinder bore; a piston for airtightly sliding in said cylinder bore; a head-side pressure chamber and a rod-side pressure chamber disposed on opposite sides of said piston; a pair of ports individually communicating with said respective pressure chambers; a sleeve for intermediate stop, airtightly passing through said rod hole for forward and rearward movements, and having a base end portion positioned in said rod-side pressure chamber, a tip end portion extending to an outside of said cylinder body, and a pressure receiving portion with a diameter smaller than that of said piston on said base end portion side; a rod airtightly passing through said sleeve for sliding relatively to said sleeve and having a base end portion connected to said piston and a tip end portion extending to said outside of said cylinder body; stop means for stopping said sleeve at a forward end; and first lock means for locking said rod and said sleeve to each other at a rearward end when said rod moves rearward relatively to said sleeve and second lock means for locking said rod and said sleeve to each other at a forward end when said rod moves forward relatively to said sleeve.