Multiple-stage hydraulic cylinder
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United States of America Patent
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Mar 25, 1997
Issued Date -
N/A
app pub date -
Nov 22, 1995
filing date -
Mar 25, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiple-stage hydraulic cylinder for shifting loads by exerting different forces over different distances, in which a hollow-piston cylinder is provided with a hollow piston rod. The hollow piston rod accommodates at least one additional long-stroke cylinder. The hollow piston rod, moreover, comprising a cylinder tube surrounding the long-stroke cylinder. Connections are provided for hydraulic fluid to move the cylinders. These connections are provided on the hollow piston rod and the long-stroke cylinder for admitting fluid to move the hollow-piston cylinder and the long-stroke cylinder.
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