(under the class definition) Apparatus in which one or more pumping members act to form a progression of completely isolated variable volume pumping chambers by a unidirectional movement.
(1) Note. Pumps comprising a series of pumping members or a single pumping member travelling unidirectionally through a fluid confining chamber are found here.
SEE OR SEARCH CLASS
91, Motors: Expansible Chamber Type,
151, for motors having serially formed expanding working chambers.
418, Rotary Expansible Chamber Devices,
4, for a plurality of chamber partitions moving along a curved path, the distance between said partition members varying during their course of travel.
