| 摘要 |
A reciprocatable pneumatic piston-cylinder for providing a strong primary movement actuated from a working chamber (5) and a soft return movement actuated from a return chamber (7), or one or more secondary stepwise softer movements, and a valve (19) arranged to provide different functional steps, and in which the valve (19) is enclosed in an end of the cylinder (1) and comprises an inlet channel (18) for pressurizing a working chamber (5), a bypass channel for evacuation of a return chamber (7) at the same time as the working chamber (5) is pressurized, and a cross channel for interconnecting the working chamber (5) and the return chamber (7) thereby providing an equalization of the pressure of said two chambers (5, 7) at the same time as the inlet and the outlet are choked by said valve, and in which the return chamber (7) communicates with the valve at the cylinder end (19) via a bore (44) extending axially through the cylinder wall.
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