Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Motor bodily rotatable with impeller hub or shaft
Patent
1978-04-24
1980-10-14
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
Motor bodily rotatable with impeller hub or shaft
416 5, B64C 1144
Patent
active
042278600
ABSTRACT:
The pitch of a rotating propeller blade is adjusted to selectively increase the pitch of the blade or to selectively decrease the pitch of the blade. The blade is connected to a rotating hub by bearings that allow the blade to change pitch. A two-direction D.C. motor mounted on the rotating hub is selectively energized to increase or decrease the pitch of the blade. A pair of sensors are mounted on the rotating hub at different distances from the hub's axis of rotation. The first sensor is adapted to generate a signal for energizing the motor in a first direction and increase the pitch of the blade. The second sensor is adapted to generate a signal for energizing the motor in a second direction and decrease the pitch of the blade. An energy source spaced from the rotating blade selectively directs a first beam of energy onto said first sensor thereby causing said first sensor to generate a signal and energize the motor and selectively directs a second beam of energy onto said second sensor thereby causing said second sensor to generate a signal and energize the motor.
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patent: 3689175 (1972-09-01), Hartzell et al.
patent: 3701498 (1972-10-01), Ferrara
Powell Jr. Everette A.
Scott Eddie E.
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