Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Motor bodily rotatable with impeller hub or shaft
Patent
1974-10-09
1978-11-07
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
Motor bodily rotatable with impeller hub or shaft
416162, 416160, 416167, B64C 1130
Patent
active
041243307
ABSTRACT:
A pitch-change apparatus for a ducted thrust fan having a plurality of variable pitch blades employs a camming ring mounted coaxially of the hub at an axially fixed station along the hub axis for rotation about the hub axis both with the blades and relative to the blades. The ring has a generally spherical outer periphery and a plurality of helical camming grooves extend in a generally spherical plane on the periphery. Each of the variable pitch blades is connected to a pitch-change horn having a cam follower mounted on its outer end, and the camming ring and the horns are so arranged about the hub axis that the plurality of followers on the horns engage respectively the plurality of helical camming grooves. Rotary drive means receives pitch-change commands from an appropriate controller and rotates the camming ring relative to the blades to cause blade pitch to be changed through the cooperative operation of the camming grooves on the ring and the cam followers on the pitch-change horns.
REFERENCES:
patent: 2460559 (1949-02-01), Wildhaber
patent: 2479668 (1949-08-01), Brandon et al.
patent: 2801068 (1957-07-01), Deriaz
patent: 3260311 (1966-07-01), Kovats
patent: 3331446 (1967-07-01), Feroy
patent: 3489338 (1970-01-01), Chilman
patent: 3801219 (1974-04-01), Parsons et al.
Del Ponti John D.
Powell Jr. Everette A.
United Technologies Corporation
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