Marine propulsion – Screw propeller – Self-clearing
Patent
1983-04-04
1985-03-26
Basinger, Sherman D.
Marine propulsion
Screw propeller
Self-clearing
416146R, B63H 516
Patent
active
045070911
ABSTRACT:
A device that shears lines and nets of the type that can befoul propellers, propeller shafts, bearings, running gear and the like of propeller driven sea-going vessels. Lines or nets that can befoul the running gear of propeller-driven sea-going vessels are sheared by the cooperative action of rotatable blade members that are integrally formed with a collar member that is affixed to and rotates conjointly with the propeller shaft, and non-rotatable blade members that are integrally formed with a ring member which is mounted within a U-shaped channel means that is formed in such rotatable collar member. The non-rotating mounting ring may carry a single blade or a pair of diametrically opposed blades, and is maintained in its operative disposition relative to the rotating blades as a result of its slidable mounting in the channel formed in the rotatable collar. The non-rotatable blade member is held stationary (becoming an opposing blade to the rotating blades) by a forwardly extending rigid arm member that is inserted into a rearwardly opening base members which is itself fixedly secured to a keel or strut means. The forwardly protruding arm and the rearwardly opening base member become a wedge assembly due to their cooperative angular formation. The wedging assembly becomes operative when a line, net or other object provides resistance to rotation of the propeller shaft, and the specific configuration of said wedging assembly enables it to drive the rotating and non-rotating blades into their working configuration, and the amount of force provided by said wedging means is directly proportional to the amount of resistance encountered. Both the rotating and non-rotating blade members are provided with ear or ramp members at their respective distal ends, said ramp members engaging one another just prior to engagement of the main blade bodies, thereby deflecting such main blade bodies a sufficient amount to avoid jamming of such blades, while allowing such blades to nevertheless maintain their operative working disposition relative to one another. Moreover, specific mechanisms to properly mount and align the inventive assembly are disclosed.
REFERENCES:
patent: 756031 (1904-03-01), Lee
Basinger Sherman D.
Smith Ronald E.
Sotelo Jesus D.
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