Marine propulsion – Screw propeller – Self-clearing
Patent
1999-04-06
1999-12-21
Basinger, Sherman
Marine propulsion
Screw propeller
Self-clearing
416146R, B63H 128
Patent
active
060041749
ABSTRACT:
Apparatus shears foreign matter such as lines, wires, nets and weeds that can entangle and befoul propellers, propeller shafts, bearings and related structure of propeller-driven, water born vessels. The apparatus shears by cooperative action of a rotating blade that rotates in conjunction with the propeller and a non-rotating blade supported on a non-rotating portion of the vessel. The non-rotating blade moves axially within its support. With each revolution, a slot follower connected to the non-rotating blade engages a slot carried by the rotating blade to adjust the axial position of the non-rotating blade to compensate for axial movement of the rotating blade. A wedge and valley mechanism prevents the two blades being forced apart during shearing action. Roller bearings, radially disposed, reduce friction between slot follower and slot to reduce wear on the parts and thereby prevent malfunction with prolonged operation and to provide low cost replacement of the bearings for maintenance.
REFERENCES:
patent: 4447215 (1984-05-01), Govan
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patent: 4801281 (1989-01-01), Govan
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patent: 5547408 (1996-08-01), Skyman
patent: 5807150 (1998-09-01), Minter
Basinger Sherman
Blum Alvin S.
Muldoon Patrick
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