US PATENT SUBCLASS 91 / 189 R
.~ Position of one working member controls motive fluid for another

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}
189 R.~ Position of one working member controls motive fluid for another {3}
190  DF  .~.~> Changeable to plural self-controlled working members
191  DF  .~.~> Each cyclically controls another (e.g., duplex) {4}
189 A  DF  .~.~> Piston or rod directly valves passage

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 91/189

(under subclass 170) Apparatus in which motive fluid for one of said working members is controlled in response to another working member attaining a given position.

(1) Note. Included under this definition are patents claiming control of motive fluid for a first working member by fluid displaced by a second working member, usually from a nonworking chamber and as a function of the position of the latter member.

SEE OR SEARCH THIS CLASS, SUBCLASS:

35+, for expansible chamber motors in which a fluid operated device controlling a working member is at least part of an independent motor which is in no way influenced by the working member controlled thereby and which has no output other than that required for control of the working member.

44, for expansible chamber motors having sequential operation of fluid operated locking means and a control of motive fluid for a working member.