US PATENT SUBCLASS 417 / 491
.~.~ Common pumping member controls inlet or discharge for plural chambers

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
490  DF  .~ Pumping member position controlled port {8}
491.~.~ Common pumping member controls inlet or discharge for plural chambers {1}
492  DF  .~.~.~> Control by movement of pumping member about axis

DEFINITION

Classification: 417/491

(under subclass 490) Apparatus comprising two or more pumping chambers and in which a single unitary element forms the pumping members for said chambers, said element being effective to control the inlet of fluid into or the discharge of fluid from the several chambers by either (1) alternately covering and uncovering a port in a wall of each of said chambers, or (2) alternately covering and uncovering a single port which is common to and placed in communication with each of said chambers at different positions of the pumping member stroke.

(1) Note. For a definition of plural chambers see the definition and notes of subclass 521.