Hydraulic and earth engineering – Marine vessel portage – launching – or removing – Lifting
Patent
1998-03-16
1999-07-06
Graysay, Tamara
Hydraulic and earth engineering
Marine vessel portage, launching, or removing
Lifting
114 44, B63C 306
Patent
active
059190000
ABSTRACT:
A hydraulic boat lift is mounted in a body of water by adjustable legs which penetrate the bottom for lateral stability. Each leg has a vertically adjustable foot to engage the bottom for maintaining a base frame horizontal. A pair of boat supporting elements are swingably mounted to the frame by pivoting rigid arms. Diagonally mounted hydraulic cylinder or cylinders driven by water pressure from a pump or municipal supply swing the support elements and a boat thereon up out of the water. A pawl on the cylinder engages recesses in the shaft of the piston to lock the elevated position. The only way to unlock is to advance the piston which forces the pawl out. The pawl must be held out while the piston is retracted. A water aspirator withdraws water from the cylinder to lower the support elements for low tide lifting.
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Blum Alvin S.
Graysay Tamara
Lagman Frederick L.
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