US PATENT SUBCLASS 418 / 57
.~ Adjustable or resiliently biased working member

Current as of: June, 1999
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418 /   HD   ROTARY EXPANSIBLE CHAMBER DEVICES

54  DF  WORKING MEMBER HAS PLANETARY OR PLANETATING MOVEMENT {6}
57.~ Adjustable or resiliently biased working member

DEFINITION

Classification: 418/57

(under subclass 54) Apparatus in which means is provided to either (1) selectively move the working member with respect to the cylinder wall surface or (2) positively urge the working member into sealing engagement with the cylinder wall surface by a spring or other biasing means as the working member moves incident to the expansion and contraction of the working chamber.