(under subclass 375) Apparatus in which there is provided a movable wall member which forms both the motor working member and the pumping member, said member comprising either (1) a piston which reciprocates within a single continuous working chamber of uniform internal cross-sectional dimensions to divide same into motor and pump chamber portions or, (2) a deformable or collapsible member (e.g., diaphragm, bellows, etc.) which has a portion thereof secured to a single
continuous working chamber to divide same into motor and pump chamber portions; whereby, application of motive fluid to said motor chamber portion causes movement of said member for expanding said motor chamber portion and simultaneously contracting said pump chamber portion.
(1) Note. Plural members with substantially identical external cross-sectional dimensions and which are in face-to-face contact or spaced with an interposed rigid element to form in effect a single unitary motor working and pumping member are included under this definition. However, plural members which are spaced solely by a body of fluid enclosed therebetween which serves to transmit movement of one of the members to another form pulsator or fluid link devices and are excluded under this definition, such devices being classified in subclasses 383+, above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56+, for drilled well-type pumps having a free piston common to both a pump and motor chamber.
383+, for pulsator apparatus comprising a movable wall separating a pump chamber from a motive fluid (i.e., pulsator fluid) chamber.
