Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Blade cuff or shank construction
Patent
1986-09-22
1988-10-18
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Blade cuff or shank construction
416155, 416167, B64C 1120, B64C 1144
Patent
active
047783443
ABSTRACT:
A variable pitch mechanism for a propeller comprises a crank pin on each rotatable blade of a propeller, or fan impeller, rotatable about a longitudinal axis thereof, a translational member having a crank pin engagement element for each crank pin, an actuating device connected to the translational member for causing the translational member to be moved in a desired direction resulting in movement of each crank pin means to cause each blade to rotate on its longitudinal axis in unison with and in the same sense as the other blade or blades of the propeller or fan impeller to cause variation in pitch of the blades. The propeller blade root assembly may have a housing, a blade root mounting rotatable about the longitudinal axis of the blade in the housing, an end cap fixed to the blade root mounting and having a thrust bearing engaging the housing to resist centrifugal force acting on the blade. The blade root may have transverse slots extending axially at right angles, a sleeve screwed onto the blade root, and a tapered bolt screwed into the end of the blade root on the axial centerline thereof to compress the root onto the inner screwed surface of the sleeve, the tapered bolt being fixed to the end cap.
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