US PATENT SUBCLASS 91 / 253
.~.~.~ Inlet controlled by relatively cyclically moved elements

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

218  DF  CYCLICALLY OPERABLE {34}
247  DF  .~ Timing control by relative adjustment of plural movable fluid control elements {3}
252  DF  .~.~ Cut off adjustable relative to admission {4}
253.~.~.~ Inlet controlled by relatively cyclically moved elements {3}
254  DF  .~.~.~.~> Biased cut off with adjustable trip
255  DF  .~.~.~.~> Adjustable fluid control for fluid actuated cut off
256  DF  .~.~.~.~> Cut off adjustable relative to reciprocating admission element {3}

DEFINITION

Classification: 91/253

(under subclass 252) Apparatus in which cyclic starting and

stopping of motive fluid flow to the working chamber is controlled by valve means having a plurality of relatively cyclically moved fluid flow control elements, and in which means are provided to adjust a fluid flow control element which controls the stopping of fluid flow so as to vary the time of occurrence of the cut off event with respect to the working member movement cycle and with respect to the occurrence of the admission event.

SEE OR SEARCH THIS CLASS, SUBCLASS:

264, for cyclically operable expansible chamber motors in which starting and stopping of fluid flow to a motor working chamber are separately controlled by plural control elements, other than those which are adjustable to vary the timing of fluid control events as defined under subclass 247.