US PATENT SUBCLASS 91 / 184
.~.~ Working member covers port to control motive fluid

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

170 R  DF  RELATIVELY MOVABLE WORKING MEMBERS WITH ONE HAVING MOTIVE FLUID CONTROLLED BY, MOVABLY INTERCONNECTED WITH OR MOVED BY ANOTHER {12}
183  DF  .~ With means interconnecting working members to cause relative motion {5}
184.~.~ Working member covers port to control motive fluid

DEFINITION

Classification: 91/184

(under subclass 183) Apparatus in which the flow of motive fluid to or from a working chamber is interrupted by a surface of the working member overlapping an orifice in the working chamber wall.