| 摘要 |
A hydraulic device is provided for controlling the rate of relative movement of first and second members between predetermined first and second stations. The device includes a housing connected to the first member and provided with a first cavity for hydraulic fluid and a second cavity for hydraulic fluid segregated from the first cavity. The first cavity has adjacent first and second segments with the second segment having a greater cross-sectional area. An orifice is disposed adjacent an end portion of the first cavity first segment which is remote from the second segment and interconnects the cavities. A valve is remote from the orifice and permits restricted hydraulic fluid flow from the first cavity to the second cavity and substantially unrestricted hydraulic flow from the second cavity to the first cavity. The direction of flow through the valve depends upon the direction of movement of a piston mounted for reciprocatory movement within the first cavity. The piston is connected to the second member and is provided with a head section which is adapted to be in sliding sealing engagement with only the first cavity first segment.
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