Hydraulically actuated portable hoist
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United States of America Patent
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Mar 18, 1997
Grant Date -
N/A
app pub date -
Apr 1, 1996
filing date -
Apr 1, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hoist is operated by a pair of hydraulic cylinders having output rods engaging a spool drum to selectively axially displace the drum on a ball screw to cause wind up of a load cable. The hoist is mounted on a mast and boom supported by a wheeled cart, with a battery powering a pump motor to raise the load. A selectively disabled check valve allows the weight of the load to lower itself by forcing fluid past the disabled check valve, returning the fluid to a reservoir.
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