US PATENT SUBCLASS 91 / 22
.~.~ Preliminary inlet to contracting chamber (e.g., cushioning)

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

6  DF  FLUID SUPPLY THROUGH DIVERSE PATHS TO SINGLE EXPANSIBLE CHAMBER {12}
20  DF  .~ Position responsive {4}
22.~.~ Preliminary inlet to contracting chamber (e.g., cushioning) {1}
23  DF  .~.~.~> By bypassing from expanding chamber (399)

DEFINITION

Classification: 91/22

(under subclass 20) Apparatus in which the motor is of the reciprocating type wherein when the motor working member is moving in one direction and approaching the end of the stroke an initial charge of motive fluid is admitted to the contracting chamber in response to the working member attaining a given position, usually to cushion the movement of the working member, and then an additional charge of motive fluid is supplied through a different supply path to cause the working member to move in the opposite direction on the return stroke.