| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylinder type multistage speed control device not only capable of getting various deceleration forces of which values vary variously in response to a stage of advancing position of a piston part but also facilitating machining of component such as a hydraulic (fluid) cylinder and the like due to no arrangement of a hydraulic passage in view of its structure, that is suitable for mass production and energy saving and can be provided in less-expensive manner.SOLUTION: This invention comprises cylinders fixed to each other through a plate and the like; reciprocating and moving piston rods slidably fitted in the cylinders. The cylinder is a fluid cylinder with its deep end being sealed. The piston rod is formed with a piston part with at least one end being fitted into the fluid cylinder. The piston part is formed with an axial inner hollow passage opened into the cylinder under its hollow state. A piston orifice having the hollow passage released to an outer circumference at the rod side end part is arranged at a position where it is opened or closed by the cylinder. The outer circumferential wall of the fluid cylinder is provided with a central side orifice opened or closed when the piston part and the piston orifice pass the same in their reciprocating motion, respectively, and in turn there is provided a deep side orifice closed at the extremity end of the far advanced piston part. |
