Marine propulsion – Screw propeller – Self-clearing
Patent
1989-08-11
1990-07-24
Basinger, Sherman D.
Marine propulsion
Screw propeller
Self-clearing
416146R, B63H 516
Patent
active
049432494
ABSTRACT:
A device shears foreign matter such as lines, wires, nets, and weeds that can entangle and befoul propellers, propeller shafts, bearings and the like of propeller-driven sea-going vessels that are sheared by cooperative shearing action of rotating blades that rotate in conjunction with the propeller and at least one non-rotating blade mounted on a non-rotating portion of the vessel. Positioning mechanism maintains the non-rotating blade in proximity to the rotating blades, for effective shearing operation. The position of the propeller will change relative to the hull, advancing axially when under way in forward drive due to the forward thrust of the propeller and retreating in reverse. Heating and cooling of the shaft will also change propeller position. The positioning mechanism senses the propeller location and moves the non-rotating blade to accomodate changes in propeller position to maintain a fixed, very close spacing between the two blades to enable them to shear foreign matter caught between them. A damping mechanism retards sudden movement. A secondary moving mechanism causes the two blades to come closer together at the moment of shearing to overcome forces that tend to push them apart.
REFERENCES:
patent: 4447215 (1984-05-01), Govan
patent: 4507091 (1985-03-01), Govan
patent: 4544363 (1985-10-01), Govan
patent: 4801281 (1989-01-01), Govan
Basinger Sherman D.
Blum Alvin S.
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