US PATENT SUBCLASS 91 / 494
.~.~ Cylinders and pistons form or coact with respective common elements having limited relative rotary movement

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}
491  DF  .~ Radially disposed cylinders {6}
494.~.~ Cylinders and pistons form or coact with respective common elements having limited relative rotary movement {1}
495  DF  .~.~.~> Cylinders or pistons pinned to common element

DEFINITION

Classification: 91/494

(under subclass 491) Apparatus in which said plural cylinders form or are connected to or coact with a first common element and said plural pistons form or are connected to or coact with a second common element in a manner such that relative rotary motion between said first and second common elements is positively constrained to less than 360 deg..

(1) Note. To come within the scope of this definition, a plurality of cylinders or pistons must be connected to their respective common members in a manner which would positively prevent full relative rotary motion (e.g., 360 deg. or more) between the common members. Therefore, a simple abutment connection between a plurality of pistons and a common eccentrically mounted ring is excluded under this definition, even though the ring itself may be journaled for rotation and intended to rotate with the pistons due to frictional engagement therewith during the normal mode of operation.