Marine crane lifting control
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United States of America Patent
Stats
-
Dec 8, 1981
Grant Date -
N/A
app pub date -
May 29, 1980
filing date -
May 29, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A marine crane includes a high speed winch having a hydraulic heave compensating system that automatically controls the crane winch to compensate for the vertical movement of a load during offloading operations. The heave compensating system includes a reversing valve for overriding manual control and for directing control pressure to stroke the pump of a hydrostatic winch drive into its raise mode of operation, and a compensating valve that regulates the displacement of the pump permitting it to develop and maintain only a predetermined pressure in the high pressure main fluid line. The heave compensating system preferably includes a lift control system for automatically hoisting a heaving load only at or near the crest or trough of a wave.
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Cited Art Landscape
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