(under the class definition) Apparatus comprising condition responsive means to vary the clearance volume of the
expansible chamber of an expansible chamber pump by sensing the occurrence of a condition or change in condition.
(1) Note. Those expansible chamber devices which have a movable wall which is movable solely by the pressure of the fluid in the chamber acting directly on the wall or a separate fluid reaction surface connected to the movable wall are excluded from this subclass, see Class 92, subclass 60. The terms "acting directly" as used above mean that the fluid acts on the separate fluid section surface without being valved. When there is disclosure of a valve between the chamber and the fluid reaction surface the patent is classifiable in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
212+, for variable displacement expansible chamber pumps provided with condition responsive drive control means.
SEE OR SEARCH CLASS
92, Expansible Chamber Devices, 60, for a flexible or resiliently biased nonworking member movable wall which is in constant communication with the working chamber of a nonrotary expansible chamber device.
418, Rotary Expansible Chamber Devices,
16+, for a variable volume working chamber rotary expansible chamber device and subclasses 24+, in particular, for such devices having a spring or fluid biased movable member.
