Hydraulic and earth engineering – Marine vessel portage – launching – or removing – Lifting
Patent
1997-01-15
1998-06-23
Graysay, Tamara L.
Hydraulic and earth engineering
Marine vessel portage, launching, or removing
Lifting
114 44, E02C 500, B63C 306
Patent
active
057695687
ABSTRACT:
An adaptable boat lift for use in raising and lowering boats having a weight of up to about sixty thousand pounds. The boat lift is able to safely support heavy boats with an upgradeable design that is adaptable to boats of varying weights and sizes by adding or changing the components of the boat lift. The boat lift has a plurality of support pilings, one piece extruded support beams, a drive shaft enclosed within the support beams, bearings attached to the support beam and surrounding the drive shaft, a mechanism for rotating the drive shaft, cradle beams to support the boat, and lifting members attached to the support beam, cradle beam and drive shaft so that when the drive shaft is rotated the boat is raised or lowered. In one embodiment, the support beams are formed as a one piece extrusion of an aluminum alloy suitable for marine use. The boat lift is adaptable to support boats of varying weights and sizes by varying one or more of the following: the number of pilings, the length of the support beams, the spacing between the pilings, the thickness and length of the cradle beams, the number of mechanisms for rotating the drive shaft, and the size and the number of bearings attached to the support beams and surrounding the drive shaft.
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Meehan John D.
Parkins David G.
ABL Boat Lifts
Graysay Tamara L.
Lagman Frederick L.
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