US PATENT SUBCLASS 418 / 264
.~.~.~ With roller

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

259  DF  POSITIVELY ACTUATED VANE {4}
260  DF  .~ Cam actuated {1}
261  DF  .~.~ In opposite directions {3}
264.~.~.~ With roller

DEFINITION

Classification: 418/264

(under subclass 261) Apparatus wherein the other element is provided with a rotatable antifriction means to engage the surface or groove of irregular contour.