US PATENT SUBCLASS 91 / 496
.~.~ Positive bidirectional drive or reciprocating members

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}
496.~.~ Positive bidirectional drive or reciprocating members

DEFINITION

Classification: 91/496

(under subclass 491) Apparatus in which the plural cylinders or pistons coact with drive transmission means (e.g., crank shaft, gear, grooved cam track, etc.), for converting relative reciprocatory movement of said cylinders and pistons to or from rotary motion of said cylinders or transmission means, said cylinders or pistons co-acting with said drive transmission means in a manner such that positive mechanical force transmission is provided therebetween during both directions (i.e., to-and-fro) of reciprocatory movement of said cylinders or pistons.

SEE OR SEARCH THIS CLASS, SUBCLASS:

493, for radially disposed bidirectionally driven reciprocating members in which plural rigidly connected pistons reciprocate in plural rigidly connected cylinders.

494+, for radially disposed bidirectionally driven reciprocating members in which the cylinders or pistons form or coact with respective common elements having limited relative rotary movement.