US PATENT SUBCLASS 91 / 501
.~.~ Cylinders contain plural oppositely movable pistons

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}
499  DF  .~ Cylinders parallel to rotation axis {6}
501.~.~ Cylinders contain plural oppositely movable pistons

DEFINITION

Classification: 91/501

Apparatus in which each of said plural cylinders define a single working chamber containing plural piston forming opposite walls thereof, said pistons being movable toward and away from each other during contraction and expansion of the working chamber.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices,

70, for expansible chamber devices having relatively movable working members forming opposite walls of a common chamber and interconnected with and parallel to a common rotatable shaft.