Helicopter rotors
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United States of America Patent
Stats
-
Mar 13, 1984
Grant Date -
N/A
app pub date -
Jan 8, 1982
filing date -
Jan 22, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A helicopter rotor includes a powered blade fold mechanism adapted to move a rotor blade between a spread operational position and a folded position and at least one lock pin (17) to lock the blade in its spread position. The mechanism includes a rotary power source (21) and a mechanical linkage (23, 25) having an over-center position and adapted so that energization of the power source in one direction moves the linkage through the over-center position to withdraw the lock pin and fold the blade, and energization in the other direction moves the blade to the spread position and re-inserts the lock pin automatically as the linkage moves back through its over-center position. Lock means may be provided to lock the blade in pitch and, in one embodiment particularly adapted for use in an articulated rotor, the lock means includes pitch, flap and lag locks.
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