Ships – Vessel raising and docking – Submerged
Patent
1979-01-26
1981-07-28
Blix, Trygve M.
Ships
Vessel raising and docking
Submerged
9 8R, 9 8P, 212146, B63C 700
Patent
active
042804302
ABSTRACT:
A system for operating a lifting cable over the side of a ship at sea in ch a spar buoy having an adjustable lifting capacity is coupled to the ship by a rigid linkage which is free to pivot on an axis attached to the deck. The lifting cable is suspended from a first sheave which is mounted above a central, longitudinal channel in the spar buoy. The linkage is attached to the top of the spar buoy such that the spar buoy may rotate about an axis normal to the deck axis of the linkage and pivot on an axis normal to the longitudinal axis of the spar buoy. A second sheave is mounted on the deck axis so that the distance between the sheaves does not change as the linkage rotates on its axis. The lifting cable is fed from a winch on the ship over the sheaves and falls through the longitudinal channel. The invention operates to decouple the motion of the ship from the lifting cable so that the vertical motion of the cable is controlled by the motion of the spar buoy. A topping lift technique for deck-handling the system and an emergency disconnect feature are also disclosed.
REFERENCES:
patent: 3782458 (1974-01-01), Slack
patent: 3912088 (1975-10-01), Bronfman
patent: 3950806 (1976-04-01), Puchois
patent: 4010500 (1977-03-01), Reid
patent: 4088089 (1978-05-01), Flory
patent: 4150636 (1979-04-01), Lundh
patent: 4173804 (1979-11-01), Duc
Briggs William D.
Wilson Jeffrey V.
Blix Trygve M.
Daubenspeck Wm. C.
Keen D. W.
Sciascia Richard S.
St. Amand Joseph M.
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