US PATENT SUBCLASS 91 / 507
.~.~ Positive bidirectional drive of 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}
499  DF  .~ Cylinders parallel to rotation axis {6}
507.~.~ Positive bidirectional drive of reciprocating members

DEFINITION

Classification: 91/507

(under subclass 499) Apparatus in which the plural cylinders or pistons coact with drive transmission means (e.g., swashplate, interconnecting linkage, 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:

502, for plural, parallel, double acting working members which of necessity require positive bidirectional force transmission.