Hydraulic and earth engineering – Marine vessel portage – launching – or removing – Lifting
Patent
1985-07-31
1987-07-07
Corbin, David H.
Hydraulic and earth engineering
Marine vessel portage, launching, or removing
Lifting
405 1, B63C 306
Patent
active
046783660
ABSTRACT:
A boat lift includes a vertical H-beam driven into the floor of a body of water adjacent a pier. A shaft housing surrounds the H-beam and slides up and down it on rollers mounted within the channels defined between the opposed flanges and web of the H-beam. A fork lift-like boat support is mounted to the shaft housing for vertical movement therewith to raise and lower a boat to and from the water. Forces are transferred from the shaft housing to the H-beam by the rollers engaging the web surfaces and the inner flange surfaces. A hoist, supported by the pier and the top of the H-beam, raises and lowers the shaft housing and boat support therewith.
REFERENCES:
patent: 2647772 (1953-08-01), Wernert
patent: 3276211 (1966-10-01), Drake
patent: 3841441 (1974-10-01), Klinkhammer
patent: 3950952 (1976-04-01), Krings
patent: 4482268 (1984-11-01), Stevenson et al.
Brochure from Marine Travelift Inc.
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