Ships – Steering mechanism – Fluid pressure
Patent
1975-09-16
1976-07-20
Kunin, Stephen G.
Ships
Steering mechanism
Fluid pressure
115 12R, 115 16, 417199A, 417200, B63H 2546
Patent
active
039700275
ABSTRACT:
In a bow steering unit for vessels including an axial flow pump having its suction and discharge nozzles intersecting with the hull of the vessel for selectively moving water in opposite directions to maneuver and steer the vessel in corresponding opposite directions, a device is provided for priming the blades of the pump with water during a light draft condition to the vessel and/or during travel of the vessel at a predetermined speed resulting in an under-priming of the blades. Such device comprises a vacuum pump installation communicating with the top portion of the pump through its casing for evacuating any air therein upon initial movement of the vessel and for overcoming the vacuum effect caused by the rapid passage of water past the nozzle openings, and further comprising a tube interconnecting a small hole in the bottom hull with such top portion of the pump so that the difference in negative pressure, during such rapid passage of water, at the larger nozzle openings and at the smaller hole causes water to inlet through the tube, with the assistance of the vacuum pump installation, to maintain the blades submerged and accordingly primed.
REFERENCES:
patent: 1445507 (1923-02-01), Haentjens
patent: 1995812 (1935-03-01), Noble
patent: 3590766 (1971-07-01), Jackson
patent: 3874316 (1975-04-01), Lorenz
Frankfort Charles E.
Kunin Stephen G.
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