Device for limiting the flapping movements of a rotary-wing airc

Details Device for limiting the flapping movements of a rotary-wing airc Device for limiting the flapping movements of a rotary-wing airc

1979-08-22

1981-09-15

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Including movement limit stop or damping means

416 46, B64C 2740

Patent

active

042894484

ABSTRACT:
This invention concerns devices for limiting the flapping movements of the blades of a rotary-wing aircraft main rotor. The device described has a well known reciprocal ring lower abutment common to all the blades. The disadvantages of this well known arrangement is obviated by the use of separate upper abutment devices for each blade. Each upper abutment device comprises a bent lever a first arm of which forms an abutment part and a second arm supports a weight. The lever can oscillate on a pivot and is acted upon by a spring which holds it in a stop position when the rotor stops so that the first arm of the lever extends almost parallel to the axial plane of symmetry of the associated blade. When the rotor rotates at sufficient speed centrifugal force pivots the lever away from the blade root.

REFERENCES:
patent: 2151215 (1939-03-01), Larsen
patent: 2742098 (1956-04-01), Jovanovich
patent: 2906348 (1959-09-01), Lovegrove
patent: 2928478 (1960-03-01), DuPont
patent: 2946391 (1960-07-01), LeMont
patent: 3147810 (1964-09-01), Mosinskis
patent: 3623682 (1971-11-01), Kretz
patent: 3679322 (1972-07-01), Mouille
patent: 3853426 (1974-12-01), Rybicki
patent: 4203708 (1980-05-01), Rybicki

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