US PATENT SUBCLASS 417 / 465
.~.~.~ Inlet or discharge controlled by cooperating ports in cylinder or piston and fixed member

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
460  DF  .~ Moving cylinder {7}
464  DF  .~.~ Cylinder oscillates about axis transverse to longitudinal axis {1}
465.~.~.~ Inlet or discharge controlled by cooperating ports in cylinder or piston and fixed member

DEFINITION

Classification: 417/465

(under subclass 464) Apparatus in which either (1) the cylinder or (2) the piston or member rigid therewith (e.g., piston rod) is provided with a pump chamber communicating passage which terminates exteriorly thereof, the terminal portion of said passage (i.e., port) being in sliding engagement with and movable relative to a stationary element having at least one port, said relative sliding movement serving to change the relative alignment of said passage terminal portion and said stationary port for controlling the flow of pumped fluid to or from the pump chamber.