Boat propeller

Details Boat propeller Boat propeller

1979-06-14

1981-06-30

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Working member foldable, pivotable or collapsible to non-use...

416140, 416134R, B63H 124

Patent

active

042759919

ABSTRACT:
The invention relates to a boat propeller with foldable blades, a so-called folding propeller. The characteristic feature of the propeller is that it is provided with resilient structure disposed to brake the swinging movement of the blades as they are spread out from the folded position to the operating position.

REFERENCES:
patent: 938290 (1909-10-01), Thompson
patent: 1682893 (1928-09-01), De La Cierva
patent: 2198475 (1940-04-01), Dorner
patent: 2500382 (1950-03-01), Rowley
patent: 3113625 (1963-12-01), Conover
patent: 3187820 (1965-06-01), Maloof
patent: 3565544 (1971-02-01), Marshall
patent: 3981613 (1976-09-01), Ehrenskjold et al.
patent: 4086025 (1978-04-01), Astrand
patent: 4094614 (1978-06-01), Munk et al.
patent: 4095919 (1978-06-01), Ehrenskjold et al.
patent: 4204806 (1980-05-01), Blanchard

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