Helicopter rotors
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United States of America Patent
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-
Apr 9, 1985
Grant Date -
N/A
app pub date -
Jun 20, 1983
filing date -
Jul 2, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A helicopter rotor includes attachment means for attaching a rotor hub to a tubular rotor drive shaft in a manner establishing a primary thrust load path and further attachment means adapted to provide a normally passive secondary thrust load path and operative automatically to retain the rotor hub in the event of a failure in the primary thrust load path. In the described embodiments the further attachment means comprise a multi-part collet consisting of a plurality of identical collet parts located internally of the drive shaft. Each collet part has an external frusto-conical surface one end for location adjacent a mating surface formed internally of the drive shaft, and a radially extending flange portion at its other end for attachment to an end surface of the drive shaft.
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