Front mounted boat lift

Details Front mounted boat lift Front mounted boat lift

1993-04-05

1995-03-07

Swinehart, Edwin L.

Ships

Vessel raising and docking

Floating dry docks

B63C 102

Patent

active

053948149

ABSTRACT:
In a front mounted lift for watercraft, the torque exerted by the lift on the dock is limited by a combination of a first buoyant force, being air trapped within the lift tanks, and a second buoyant force, being flotation devices connected to the rear of the lift. In a preferred embodiment, the primary buoyant force is achieved by the extension of an air supply and exhaust hose into each tank compartment to a level below the uppermost level of the tank chamber. When the water level in each tank compartment covers the hose opening, the air trapped in the tank provides a buoyant force to counter most of the submerged lift weight. The depth of the hose is selected so that the weight of the lift slightly exceeds the primary/buoyant force. This permits the lift to sink but significantly minimizes the torque exerted on the connection of the lift to the dock. The secondary buoyant force preferably consists of a pair of buoyant guides which prevent the rear of the lift from sinking to an undesirable depth. This secondary force further reduces the torque on the dock. These buoyant guides also serve to direct the watercraft into its proper position on the lift during the landing process and to support the watercraft in its operational attitude on the lift when the watercraft is raised out of the water.

REFERENCES:
patent: Re27090 (1971-03-01), Rutter
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patent: 3316872 (1967-05-01), Van Eck
patent: 3362172 (1968-01-01), Rutter
patent: 3727415 (1973-04-01), Williams
patent: 3895592 (1975-07-01), King
patent: 4018179 (1977-04-01), Rutter
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patent: 4641595 (1987-02-01), Pritchett
patent: 4934298 (1990-06-01), Pritchett
patent: 4955308 (1990-09-01), Craddock
patent: 4983067 (1991-01-01), Montgomery
patent: 5002000 (1991-03-01), Rutter
patent: 5016685 (1991-05-01), Fender
patent: 5115753 (1992-05-01), Craddock
patent: 5140922 (1992-08-01), Bowman et al.

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