US PATENT SUBCLASS 417 / 403
.~.~.~.~.~ Double acting motor piston

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  DF  .~.~.~.~ Integral pump and motor pistons {2}
403.~.~.~.~.~ Double acting motor piston {1}
404  DF  .~.~.~.~.~.~> Double acting pump piston

DEFINITION

Classification: 417/403

(under subclass 401) Apparatus in which the motor piston cooperates with a single continuous motor cylinder to divide same into a pair of opposed expansible working chambers, there being means provided for controlling the supply or exhaust of motive fluid to or from each of said opposed working chambers to drive the motor piston in opposite directions.