| 摘要 |
PURPOSE:To prevent a device from being brought into an inoperable state even when oil leakage and mixture of air occur by a method wherein a push rod freely slidable in a hydraulic cylinder body independently from a pair of pistons individually slidably engaged internally of the hydraulic cylinder is located between a pair of the pistons. CONSTITUTION:When a load is exerted on a piston rod 18 on the right side, a piston 17 on the right side pushes a push rod 19 as it performs a buffer action by resistance produced when oil liquid in an inner cylinder 2 on the right side flows through an orifice 11 and a throttle groove 12, and further pushes a piston 17 on the left side through the push rod. Thereby, the piston rod 17 on the left side is pushed leftward as a piston rod 18 thereof is protruded. Oil liquid in an inner cylinder 2 on the left side flows in a communicating hole 10, a front accumulating chamber 8, and a communicating groove 13, and further flows in the rear chamber of the inner cylinder 2 formed on the rear side of the piston 17 on the left side. |
