Marine propulsion – Screw propeller – Self-clearing
Patent
1985-03-18
1985-10-01
Blix, Trygve M.
Marine propulsion
Screw propeller
Self-clearing
416146R, B63H 516
Patent
active
045443637
ABSTRACT:
A device mounted in encircling relation to a propeller shaft. The device cuts lines, nets and weeds, thus preventing entanglement of the propeller and preventing entanglement damage which may result to the parts of the driven assembly of outboard motor and inboard/outboard motor vessels. The device includes a non-rotatable, annular cutting member, having one double-edged cutting blade, that is disposed in sandwiched relation to two rotatable annular members. One of the rotatable members carries no cutting blades, and the second rotatable member carries three double-edged, circumferentially spaced blades that individually cooperate with the non-rotatable blade in a shearing action. The blade-carrying rotatable member includes a concentric mounting ring that is offset toward the propeller shaft housing, and the offset defines a centrally apertured projecting portion which aperture is in the form of a tapered seat that mates with a corresponding taper formed on the propeller shaft. When the mount nut for the propeller is tightened, the forward flat face of the propelleris driven into firm abutting relation to the blade-carrying rotatable member anddrives the taper formed therein firmly into wedging engagement with the taper onthe propeller shaft so that both rotatable cutter members will rotate conjointlywith the shaft. The projecting portion of the rotatable member defines an annular shelf which positions the non-rotatable cutter member.
REFERENCES:
patent: 732568 (1903-06-01), Lee
patent: 756031 (1904-03-01), Lee
patent: 1390397 (1921-09-01), Svenson
patent: 3371720 (1968-03-01), Blanchard
patent: 4211515 (1980-07-01), Henrich
Bartz C. T.
Blix Trygve M.
Smith Ronald E.
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