.~ Control by withdrawal or tilting of pump piston relative to cylinder
DEFINITION
Classification: 417/489
(under subclass 437) Apparatus in which the expansible chamber pump comprises a cylinder having a relatively movable piston therein, admission or discharge of pumped fluid to or from the expansible chamber occurring as the result of the piston being either (1) tipped or canted relative to the cylinder to provide a fluid flow passage between adjacent cylinder and piston sidewall portions or (2) withdrawn or extracted from the cylinder so as to provide open communication between the cylinder interior and the surrounding medium.
SEE OR SEARCH THIS CLASS, SUBCLASS:
320, for apparatus having a pumping member which moves unidirectionally into and out of a chamber to form serial pumping chambers.
