Traversing hoists – Having counterweight or counterbalancing means – Counterweight movable relative to load support
Patent
1980-05-29
1981-12-08
Rowland, James L.
Traversing hoists
Having counterweight or counterbalancing means
Counterweight movable relative to load support
414139, B66D 150
Patent
active
043043372
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.
REFERENCES:
patent: 3753552 (1973-08-01), Barron
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patent: 4132387 (1979-01-01), Somerville et al.
patent: 4166545 (1979-09-01), Martinussen et al.
patent: 4180171 (1979-12-01), Cunningham et al.
patent: 4180362 (1979-12-01), Stair
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"Engineering", Crane Digest, Apr. 1978, pp. 1, 2.
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"Hook Block Heave Compensator", Sedame Sales Literature, 6 pages.
"Motion Compensator Handles Cargo", Ocean Industry, Jan. 1979, p. 78.
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Bucyrus-Erie Company
Rowland James L.
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