| 摘要 |
<p>PURPOSE:To change a telescopic speed and acting force, by placing a control rod telescopically extending and retracting in a piston rod housed in a hollow cylinder. CONSTITUTION:If oil is injected into a cylinder 21 from a port 24, a piston rod 29 is pulled out from a cylinder top 23 by pressing a piston 28. Here the piston rod 29 moves at a quick speed with a control rod 30 generating no movement in the cylinder 21. Next, if oil is injected into a holding hole 26 from a port 27, the oil in the cylinder 21, circulating through a passage 32, extrudes the control rod 30 with no load being applied, and if a bottom end of the control rod 30 is drawn out from the holding hole 26, the piston 28 is closely attached to a control piston 31. In this way, an oil hydraulic cylinder, integrally moving the piston 28, piston rod 29, control rod 30 and the control piston 31 in the cylinder 21 and increasing force by fluid acting on the piston rod 29, is enabled to increase acting force.</p> |
