B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
138/40.14
B25D 9/12 (2006.01)
Patent
CA 1072859
A B S T R A C T A hydraulic reciprocating machine including a cylinder, a piston that moves forwards and backwards in the cylinder under the influence of a high pressure hydraulic fluid, a working stroke area on the piston, a first space in which the working stroke area moves, a return stroke area, a second space in which the return stroke area moves, valve and timing means that control the fluid so that the piston moves to and fro, a path from the valve to the first space to provide working stroke fluid through a variably restricted orifice the effective area of which varies in accordance with the position of the piston along its path.
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