US PATENT SUBCLASS 416 / 103
.~ Lead-lag type rotor blade movement

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

98  DF  SUSTAINED ANCILLARY MOVEMENT OF ROTARY WORKING MEMBER (E.G., CYCLIC FEATHERING, ETC.) {9}
103.~ Lead-lag type rotor blade movement {3}
104  DF  .~.~> And additional correlated blade movement (e.g., pitch change, etc.)
105  DF  .~.~> Positive means effecting lead-lag movement
106  DF  .~.~> With movement restraining means (i.e., damping) {1}

DEFINITION

Classification: 416/103

(under subclass 98) Apparatus comprising an impeller* of the type having one or more bladed working members which project radially outward from a rotation axis, such as a helicopter rotor, the inner radial end of each working member being pivotally attached to a carrier* for movement about an axis parallel to the rotation axis such that the member oscillates forwardly (in the direction of rotation) during a portion of

the rotation cycle (lead) and oscillated rearwardly (opposite the direction of rotation) during another portion of the rotation cycle (lag).

SEE OR SEARCH THIS CLASS, SUBCLASS:

141, for "free blade" mountings not involving means for causing cyclic blade movement.