US PATENT SUBCLASS 91 / 449
.~ Plural separately controlled waste passages for single working chamber

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

418  DF  WITH MOTIVE FLUID VALVE {32}
449.~ Plural separately controlled waste passages for single working chamber {2}
450  DF  .~.~> One passage controlled by inlet and exhaust valve {1}
452  DF  .~.~> One passage controlled by motive fluid pressure or flow-responsive valve (468)

DEFINITION

Classification: 91/449

(under subclass 418) Apparatus in which the same working chamber of the motor is provided with at least two waste

passages through which motive fluid may be diverted or exhausted from the chamber and the valve means is operable to control these passages separately of one another.

(1) Note. A waste passage under this definition includes an exhaust line or a line branching from an inlet line which is controlled merely to prevent motive fluid from reaching the chamber by being opened, while the inlet line is open to the chamber. A passage for motive fluid which is directed from the chamber to some motor control means, (e.g., valve actuator, feel or holding means) or for some function ancillary to the motor operation (e.g., sealing) is excluded.

SEE OR SEARCH THIS CLASS, SUBCLASS:

48, for expansible chamber motors in which motive fluid is constantly applied to a working chamber thereof and having a plurality of separately controlled vent or waste passages to control the operation of the motor.

236+, for cyclically operable expansible chamber motors having multiple exhaust passages.

407+, for expansible chamber motors having a plurality of exhaust passages which are successively controlled in response to working member position.