Ships – Vessel raising and docking – Floating dry docks
Patent
1977-03-21
1978-02-07
Blix, Trygve M.
Ships
Vessel raising and docking
Floating dry docks
61 65, B63C 102
Patent
active
040721191
ABSTRACT:
A boat lift for lifting and storing boats out of the water, the lift being arranged for mounting in a boat well having opposed parallel vertical sidewalls spaced above the surface of a body of water, the lift including two pairs of trunnion members affixed to the boat well sidewalls, one pair being in a forward horizontal axial alignment and the other pair in a rearward horizontal axial alignment, the axii being parallel to each other, a frame adapted to be lowered into the water to receive a boat floating in the water thereon and to be raised with the boat on the frame to lift it clear of the water for storage, the frame having a forward pair of guide members and a rearward pair of guide members, each pair of guide members being parallel to each other and each guide member having an elongated slot therein which slidably receives one of the trunnion members, the slot in each of the four guide members being of the same angular relationship to the vertical of between 15.degree. and 75.degree. and preferably about 45.degree., a pontoon secured to the lower portion of the frame, an opening for admitting water into the pontoon to sink it and a compressor for displacing the water with air to float the pontoon and frame for lifting a boat above the water, the slotted guide members moving on the trunnions to maintain the frame and the boat thereon horizontal as the boat is raised by the pontoon.
REFERENCES:
patent: 3951087 (1976-04-01), Carson
patent: 3991695 (1976-11-01), McDonald
Blix Trygve M.
Wacyra Edward M.
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