US PATENT SUBCLASS 91 / 477
.~.~ Each piston acts as valve for different working chamber

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

472  DF  THREE OR MORE CYLINDERS ARRANGED IN PARALLEL RADIAL OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS {10}
476  DF  .~ Separate motive fluid control for each working chamber {4}
477.~.~ Each piston acts as valve for different working chamber

DEFINITION

Classification: 91/477

(under subclass 476) Apparatus in which the cylinders contain pistons which reciprocate relative thereto to form the working chambers, each piston acting as a valve to control the flow of motive fluid to or from a working chamber other than the working chamber of which that piston forms a part.

(1) Note. The piston may act as a pilot to control actuating fluid for a valve of another chamber.