Marine propulsion – Screw propeller – Propeller guard
Patent
1982-07-06
1984-05-08
Blix, Trygve M.
Marine propulsion
Screw propeller
Propeller guard
440 73, 416146R, B63H 516
Patent
active
044472153
ABSTRACT:
A device that shears lines and nets of the type that can befoul propellors, propellor shafts, bearings, running gear and the like of propellor driven, sea-going vessels. A first pair of non-rotatable, diametrically opposed, radially extending cutting blade members are disposed on opposite sides of a keel, or on opposite sides of a strut that depends from the hull of an inboard motor-type boat or ship. Such blade members are provided with respective forwardly extending wedge-shaped projection portions that wedgingly engage respective rearwardly opening wedge-defining base members that are fixedly secured to opposite sides of the keel or the strut. A second pair of rotatably mounted, diametrically opposed, radially extending cutting blade members are disposed on opposite sides of a collar that is affixed to and that rotates conjointly with a propellor shaft, and such second cutting blade members cooperate with the first cutting blade members to effect a shear of troublsome lines and nets. The wedging relation between the first cutting blade members and their respective base members ensures against longitudinal separation of the first and second blade members, and the first blade members are carried by a collar that is disposed within a channel formed in the collar of the second blade members, thereby further preventing such separation and also overcoming bearing play in the shaft mechanism.
REFERENCES:
patent: 732568 (1903-06-01), Lee
patent: 1390397 (1921-09-01), Svenson
patent: 1649657 (1927-11-01), Blake
patent: 1813540 (1931-07-01), Laska
patent: 2666485 (1954-01-01), Antosh
patent: 3371720 (1968-03-01), Blanchard
patent: 4211515 (1980-07-01), Henrich et al.
Blix Trygve M.
Brahan Thomas J.
Smith Ronald E.
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