Variable pitch propeller

Details Variable pitch propeller Variable pitch propeller

1994-02-14

1996-06-18

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

416 89, 416153, F04D 2918

Patent

active

055271537

ABSTRACT:
A variable pitch propeller assembly is disclosed for a power boat. Three blades are mounted on a housing carried by the propeller shaft. Each blade has an axle received in the housing. Each axle has a slot receiving a dowel carried in the housing so the blade can rotate about 5.degree. between two pitch positions. A centrifugally-operated, spring biased latch carried in the housing locks the shaft in each pitch position. The blade is released from the latch by a predetermined change in the hydrodynamic force acting on the blade surface. The propeller shaft is connected to the propeller assembly by three plastic keys which shear to permit the propeller assembly to spin with respect to the propeller shaft when the propeller assembly strikes a predetermined resistance, such as a rock or the like.

REFERENCES:
patent: 2998080 (1961-08-01), Moore, Jr.
patent: 4599043 (1986-07-01), Muller
patent: 4792279 (1988-12-01), Bergeron
patent: 4826404 (1989-05-01), Zwicky
patent: 5022820 (1991-06-01), Bergeron
patent: 5129785 (1992-07-01), Speer
patent: 5232345 (1993-08-01), Rocco
patent: 5252028 (1993-10-01), LoBosco et al.
patent: 5326223 (1994-07-01), Speer

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