Ships – Vessel raising and docking – Floating dry docks
Patent
1991-06-10
1992-05-26
Sotelo, Jesus D.
Ships
Vessel raising and docking
Floating dry docks
B63C 102
Patent
active
051157535
ABSTRACT:
A floating boat lift for lifting and supporting a boat above the surface of a body of water. The device includes a lower pontoon base and two elongated upper pontoons positioned above the lower pontoon base and held spaced apart and generally parallel one to another by a rigid frame connected therebetween. The upper pontoons are laterally restrained and are controlledly movable vertically with respect to the lower pontoon base by a vertical actuator arrangement. The upper pontoons may be filled or emptied of water. When empty, the actuator arrangement extends in length so as to lift the upper pontoons from the water. A boat placed atop the frame is also lifted and held above the water as the upper pontoons are drained. When the upper pontoons are filled with water, the actuator arrangement compresses in length and the lower pontoon base submerges until the lower portions of the upper pontoons become submerged, at which point the boat may be floated onto or removed from the submerged frame. The device is fully self-buoyant during all aspects of use.
REFERENCES:
patent: 3603276 (1971-09-01), DeLisle
patent: 4381723 (1983-05-01), Furst
patent: 4750444 (1988-06-01), Lemvig
patent: 4955308 (1990-09-01), Craddock
Prescott Charles J.
Sotelo Jesus D.
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