Automatic variable discrete pitch marine propeller

Details Automatic variable discrete pitch marine propeller Automatic variable discrete pitch marine propeller

1991-01-24

1992-07-14

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

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

Impeller rotation speed responsive

416 34, 416 43, 416 44, 416 51, 416 52, 416 53, 416147, 416167, B63H 300

Patent

active

051297850

ABSTRACT:
A self-actuating variable pitch marine propeller which incorporates two or more blades having cylindrical shafts which are rotatably connected to a central hub via cylindrical joints; the blades rotate about and translate radially, relative to the hub center, along the blade shaft, or shank, axis. In operation, the blades move radially outwardly from the hub center as they rotate from lower to higher pitch. The blades are biased towards the lower pitch. As the propeller rotational speed increases, centrifugal forces act on the blade mass creating a radially directed outward force. This radially outward force, upon reaching a sufficient magnitude, causes the blades to move radially outward. A blade positioning mechanism connected between each blade and the hub directs the blades to rotate to a higher pitch angle as the blades move radially outward. There is further provided a holding mechanism to retain, or hold, the blades at least in one discrete pitch position; the holding mechanism is designed such that at a sharply defined combination of parameters, including rotational speed and, optimally, hydrodynamic load on the blades, the blades are released and permitted to move to a second pitch position.

REFERENCES:
patent: 1389609 (1921-09-01), Weiher
patent: 1953682 (1934-04-01), Kelm
patent: 1986752 (1935-01-01), Rorvik
patent: 2023684 (1935-12-01), Hubbell
patent: 2243046 (1941-05-01), Algarsson
patent: 2694459 (1954-11-01), Biermann
patent: 2955659 (1960-10-01), Daley
patent: 3186492 (1965-06-01), Chillson et al.
patent: 4599043 (1986-07-01), Muller
patent: 5022820 (1991-06-01), Bergeron

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