| 摘要 |
A device generating strokes by hydraulic pressure optionally in two directions and having a to- and from moving piston (5), the travel of which is maintained in steering the hydraulic pressure by means of a reversing valve (12) to produce effect upon transverse faces formed in the piston and the opposite ends of which piston (5), work as strokes transmitting faces. Piston (5, 19) is a ring-shaped piston, in the annular space of which a cylinder space (4, 26) is formed into which at least a portion of the stroke-transmitting body (2, 22) that functions as attachment body for a tool (1) or for the target objects (25) is placed.
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