US PATENT SUBCLASS 417 / 511
.~.~ Piston carried distributor, one frictionally engages chamber wall, drive rod integral with other (e.g., piston driven by valve element through lost motion connection, etc.)

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
510  DF  .~ Mechanically actuated distributor {5}
511.~.~ Piston carried distributor, one frictionally engages chamber wall, drive rod integral with other (e.g., piston driven by valve element through lost motion connection, etc.) {2}
512  DF  .~.~.~> Unitary distributor element controls inlet or discharge for plural chambers
513  DF  .~.~.~> Conical engagement

DEFINITION

Classification: 417/511

(under subclass 510) Apparatus in which the valve element is carried on or within the piston for axial movement relative thereto and either (1) the piston is in frictional contact with a pump chamber wall portion and is driven by a power transmission element which is rigidly connected to the valve element or (2) the valve element is in frictional contact with a pump chamber wall portion and the piston is driven by a transmission element rigidly connected thereto.