Piston assembly and method
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United States of America Patent
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Feb 16, 1993
Issued Date -
N/A
app pub date -
Feb 24, 1992
filing date -
Jan 9, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A piston assembly employs a central velocity tube which provides an increase in speed of the initial downward stroke phase while requiring less power than conventional hydraulic cylinder assemblies. A second stage hydraulic surge causes the piston to forcefully descend the final increment of the downstroke for an increase in power of the piston. The return or upstroke of the piston is of conventional hydraulic design.
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