US PATENT SUBCLASS 91 / 227
.~.~.~ Port controlled by piston position

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

218  DF  CYCLICALLY OPERABLE {34}
222  DF  .~ Distributor in piston (422) {6}
226  DF  .~.~ Communication into piston through peripheral port {1}
227.~.~.~ Port controlled by piston position

DEFINITION

Classification: 91/227

(under subclass 226) Apparatus in which communication between the port in the working chamber and the passage in the piston is established and broken by relative reciprocation of the two members.

SEE OR SEARCH THIS CLASS, SUBCLASS:

225, for a cyclically operable motor having a fluid operated distributor in the piston, said distributor being controlled by traversal of a pilot port in the cylinder wall.