US PATENT SUBCLASS 417 / 401
.~.~.~.~ Integral pump and motor pistons

Current as of: June, 1999
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417 /   HD   PUMPS

321  DF  MOTOR DRIVEN {32}
375  DF  .~ Fluid motor {9}
398  DF  .~.~ Rectilinearly reciprocating cylinder and piston-type motor {1}
399  DF  .~.~.~ Rectilinearly reciprocating cylinder and piston-type pump {2}
401.~.~.~.~ Integral pump and motor pistons {2}
402  DF  .~.~.~.~.~> Constantly applied force in education stroke direction
403  DF  .~.~.~.~.~> Double acting motor piston {1}

DEFINITION

Classification: 417/401

(under subclass 399) Apparatus in which the motor piston is the movable motor working member and the pump piston is the movable pumping member, said motor piston being drivingly connected to the pump piston in a manner such that both of said pistons move together in unison during the normal mode of operation.

(1) Note. Included under this definition are those devices in which there is provided a valved pump piston and the motor working member is connected to the pump piston valve to actuate same and to drive the pump piston through a lost motion connection.