Pitch-change apparatus for a ducted thrust fan

Details Pitch-change apparatus for a ducted thrust fan Pitch-change apparatus for a ducted thrust fan

1974-10-09

1977-05-03

Powell, Jr., Eugene A.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

416160, B64C 1132

Patent

active

040211428

ABSTRACT:
A pitch-change apparatus for a ducted thrust fan having a plurality of variable pitch blades employs a rotatable ring bearing a plurality of camming members, and each of the plurality of blades is connected with a pitch-change horn engaged by one of the camming members. The ring and camming members rotate coaxially about a hub axis with the blades and rotate about the hub axis relative to the blades to collectively change blade pitch. The rotatable ring, the camming members and the pitch-change horns develop a variable mechanical advantage, and the pitch horns are connected with their respective blades so that the minimum mechanical advantage corresponds with the low-load, feathered pitch position of the blades and greater mechanical advantages correspond with the higher load, forward and reverse pitch positions of the blades.

REFERENCES:
patent: 1582166 (1926-04-01), Cederquist
patent: 2801068 (1957-07-01), Deriaz
patent: 3489338 (1970-01-01), Chilman
patent: 3794442 (1974-02-01), McMurtry
patent: 3801219 (1974-04-01), Parsons et al.

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