Ships – Building – Canal and ferry boats
Patent
1978-02-02
1980-08-12
Blix, Trygve M.
Ships
Building
Canal and ferry boats
9 11A, 114125, B63C 904
Patent
active
042165598
ABSTRACT:
A life raft, having a floor joined at its periphery to a flotation member, is formed with a flexibly-walled, depending, correspondingly water ballast chamber generally parallel and contiguous to the flotation member. The chamber may be compartmented for retention of the water ballast as a distributed stabilizing mass, and extends about a wholly open center area that underlies all or the greatest part of the floor, thus to concentrate the ballast below the peripheral flotation member as a further aid to stability.
Ports are provided in the walls of the chamber, the openings of at least the outer wall being continuously open to the flow of water therethrough. In one form of the invention the openings of the inner side wall are check-valved to exhaust air from the center space, creating a partial vacuum that increases the stability of the raft.
REFERENCES:
patent: 2390199 (1945-12-01), Walsh
patent: 2858790 (1958-11-01), Russell, Jr.
patent: 3034154 (1962-05-01), Silverstone
patent: 3060465 (1962-10-01), Carstensen
patent: 3092854 (1963-06-01), Manhart
patent: 3155992 (1964-11-01), Shewmake et al.
patent: 3344764 (1967-10-01), Ziermann
patent: 3371640 (1968-03-01), Tsokalas
patent: 3736607 (1973-06-01), Radnofsky et al.
patent: 3883913 (1975-05-01), Givens
patent: 4001905 (1977-01-01), Givens
Blix Trygve M.
Douglas Winston H.
Kane John J.
Sperry Albert
Zoda Frederick A.
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