US PATENT SUBCLASS 418 / 250
.~.~ Winged abutment

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

243  DF  POSITIVELY ACTUATED ABUTMENT {4}
249  DF  .~ Fluid biased {2}
250.~.~ Winged abutment

DEFINITION

Classification: 418/250

(under subclass 249) Apparatus wherein the abutment is provided with working member abuttable portions extending from a common pivot and oscillating in a common plane and each abuttable portion being adapted to engage the working member whereby the working member may be rotated in either direction.