| 摘要 |
An automatically-reversing, fluid-actuated piston-and-cylinder unit includes a cylinder with a first section reciprocably receiving a piston and a second section reciprocably receiving a spool valve member. The piston is connected to a piston rod that extends slidably through the valve member. The valve member includes a plurality of lands that subdivide the cylinder second section into a plurality of fluid chambers. In a first position the valve member directs fluid to one side of the piston and in a second position it directs fluid to the other side of the piston. The valve member is automatically shifted between its first and second positions when the piston reaches its limits of travel.
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