US PATENT SUBCLASS 417 / 534
.~.~ Chambers formed at opposite ends of rectilinearly moving pumping member

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
521  DF  .~ Plural pumping chambers {7}
534.~.~ Chambers formed at opposite ends of rectilinearly moving pumping member {1}
535  DF  .~.~.~> All discharge distributors positioned laterally of pumping member path {1}

DEFINITION

Classification: 417/534

(under subclass 521) Apparatus in which the plural pumping chambers are formed at opposite ends of a common pumping member which moves to-and-fro along a straight line (includes diaphragm), movement of said pumping member effecting expansion of one of said pumping chambers and simultaneous contraction of the other.

(1) Note. Plural pumping chambers formed in separate cylinders are included under this definition if the cylinders are coaxial and contain pumping members which are rigidly interconnected.

SEE OR SEARCH THIS CLASS, SUBCLASS:

404+, for a double acting pump piston driven by a rigidly attached double acting reciprocating fluid motor.

418, for a double acting pump piston driven by a rigidly attached reciprocating electric motor.

491+, for a common pumping member for plural pumping chambers in which the pumping member controls an inlet or discharge port for the chamber.

525+, for a common pumping member for plural aligned chambers wherein the pumping member includes valves for controlling pump fluid to or from the chambers.

528+, for plural pumping chambers wherein a fluid conduit for one of the chambers extends through a portion of another.