Prime-mover dynamo plants – Fluid-current motors – Wind
Patent
1975-12-31
1978-01-10
Schaefer, Robert K.
Prime-mover dynamo plants
Fluid-current motors
Wind
416 89, 416135, 74381, F03D 900
Patent
active
040681319
ABSTRACT:
A multiblade, wind-driven, variable pitch propeller is used in a wind electric plant for the generation of electrical power from wind forces, and the propeller is rotatable in a plane at an angle to the tower axis, enabling larger propellers to be used without propeller-tower interference and also reducing the distance between the propeller and gear case. A snubber arrangement is provided on the propeller blade return springs to slow the governor action and prevent abrupt pitch changes and damaging flutter of the blades, and a self-centering, double-acting pivot washer is provided between the propeller blades and the return springs to ensure free pivoting and long life of the spring connecting bolts. Adjustable positive blade stop bolts are engaged directly between the hub and the propeller blades to limit return movement thereof. The propeller hub-return spring connection includes a laterally movable spring bracket which enables the propeller blades to feather in the event one or more return springs is broken or otherwise rendered inoperative. The gear case center, ring gear and axis of propeller rotation are offset laterally from the axis of the tower and pinion gear, to balance torque forces generated at the gears with wind forces on the propeller.
REFERENCES:
patent: 1266518 (1918-05-01), Mulrony
patent: 1315595 (1919-09-01), Clark
patent: 1589828 (1926-06-01), Williams et al.
patent: 1666361 (1928-04-01), Thompson
patent: 2376020 (1945-05-01), Victoria
patent: 2505969 (1950-05-01), Jacobs
patent: 2652699 (1953-09-01), Romani
Jacobs Marcellus L.
Jacobs Paul R.
Indyk Eugene S.
Schaefer Robert K.
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