Foldable propeller

Details Foldable propeller Foldable propeller

1979-02-06

1980-12-30

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

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

416166, B63H 124

Patent

active

042420490

ABSTRACT:
A foldable boat propeller comprising a hub to which the propeller blades are pivotally connected and which has two mutually turnable portions, one of which is fixedly secured to the propeller shaft and has a cam surface whereas the other one carries the propeller blades, and an axially shiftable plunger member which is mechanically connected to the propeller blades and unfolds them to working position on relative turning of the hub portions and axial shifting of said plunger means in response thereto only when the propeller shaft is driven in the reverse propulsion direction. Said plunger means is released for blade unfolding by centrifugal and water thrust force when the propeller shaft is driven in the forward propulsion direction.

REFERENCES:
patent: 731020 (1903-06-01), Charles
patent: 866369 (1907-09-01), Learnard
patent: 938291 (1909-10-01), Thompson
patent: 993126 (1911-05-01), Thomspon
patent: 2481751 (1949-09-01), James
patent: 2500382 (1950-03-01), Rowley
patent: 4086025 (1978-04-01), Astrand
patent: 4094614 (1978-06-01), Munk et al.

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