Rotationally retractable propeller

Ships – Steering mechanism – Fluid pressure

Reexamination Certificate

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Details

C440S054000, C440S062000

Reexamination Certificate

active

07146921

ABSTRACT:
A retractable thruster for a surface or submersible vessel, having thruster a propulsion assembly with a rigid structure secured to a cylindrical turbine. The rigid structure contains a motor suitable for rotating at lease one propeller inside the turbine via at least one rotary shaft positioned between the motor and the propeller. The thruster preferably further has a plate for closing the hull placed beneath the turbine and secured thereto, the propulsion assembly being displaceable between a retracted position in which it is at rest inside the hull and a deployed position for providing propulsion in which the propeller is immersed beneath the hull. The propulsion assembly is movable between the retracted and deployed positions by the propulsion assembly moving in a uniformly circular direction about an axis of rotation situated substantially no higher than the level of the hull.

REFERENCES:
patent: 3901177 (1975-08-01), Scott
patent: 3918389 (1975-11-01), Shima
patent: 4242979 (1981-01-01), Shima
patent: 4294186 (1981-10-01), Wardell
patent: 5108323 (1992-04-01), Veronesi et al.
patent: 5152240 (1992-10-01), Fontanille
patent: 5257952 (1993-11-01), Veronesi et al.
patent: 6056610 (2000-05-01), Fontanille
patent: 37 18 222 (1988-02-01), None
patent: 0612658 (1994-08-01), None
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patent: 2741854 (1997-06-01), None
patent: 2798184 (2001-03-01), None
patent: 8700535 (1988-10-01), None
patent: WO97/20733 (1997-06-01), None
patent: WO97/26181 (1997-07-01), None
patent: WO98/30440 (1998-07-01), None

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