(under the class definition) Apparatus in which a motor working chamber and working member are in continuous communication with a low pressure region by means of a restricted outlet under all conditions of operation of the motor, the movement of the motor working member being controlled by the operation of means to selectively or adjustably connect the working chamber to a source of motive fluid supply.
(1) Note. Motor movement is obtained by supplying motive fluid in greater quantities than the restricted, open outlet has capacity to pass.
(2) Note. The restriction of the outlet may be adjustable at the will of the operator, but those devices in which the outlet is variably restricted in response to a condition of operation of the motor are excluded.
(3) Note. The low pressure region may be a source of vacuum and the controlled motive fluid supply be atmospheric air.
SEE OR SEARCH THIS CLASS, SUBCLASS:
296, for cyclically operable motors having a motor operated distributor in which the working chamber of the distributor has a constantly open throttled exhaust and a controlled motive fluid supply.
