US PATENT SUBCLASS 91 / 236
.~ Multiple exhaust passages (e.g., compression control)

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

218  DF  CYCLICALLY OPERABLE {34}
236.~ Multiple exhaust passages (e.g., compression control) {5}
237  DF  .~.~> Exhaust valve has separate valve controlled second exhaust passage therein {1}
239  DF  .~.~> Distributor for inlet or first exhaust controls second exhaust passage
240  DF  .~.~> Fluid pressure actuated valve for second exhaust passage {2}
243  DF  .~.~> Working member controlled exhaust port with valved second exhaust passage
244  DF  .~.~> Controlled by separate relatively movable valves

DEFINITION

Classification: 91/236

(under subclass 218) Apparatus in which there are provided a plurality of controlled (i.e., valved or working member position controlled) exhaust flow paths from a working chamber (i.e., exhausting), one of said flow paths constituting a second exhaust passage which provides for exhaust flow or continuation of exhaust flow after another of said flow paths has been closed, or provides a flow path, separate and distinct from another of said flow paths, for the removal of condensate from the expansible chamber in synchronism with movement of the working member of the motor.

(1) Note. Plural exhaust passages which are simultaneously opened and closed and merely provide the equivalent operation of a single larger port are not considered to fall within this definition, even though they may incidentally remove condensate; however, plural passages one of which is specifically provided and arranged to remove condensate, even though opened and closed simultaneously with another exhaust passage are included.

(2) Note. For purposes of this definition the term "second exhaust passage" is intended to designate that passage which provides exhaust flow after another exhaust flow path is closed, or which provides for condensate removal, irrespective of the relative sizes of the plurality of flow paths.

(3) Note. Fluid which is conducted from the working chamber for a valve operating or other function ancillary to the operation of the motor, such as sealing, is not considered to be exhaust motive fluid under this definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

290+, for cyclically operable expansible chamber motors in which the working member traverses a pilot port in the

working chamber side wall to provide actuating fluid for a distributor motor. 449+, for expansible chamber motors, other than those which are cyclically operable, having separately controlled waste passages for a single chamber.