US PATENT SUBCLASS 60 / 577
.~.~.~.~ Central externally driven piston drives surrounding piston means through a load responsive connector

Current as of: June, 1999
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60 /   HD   POWER PLANTS

325  DF  PRESSURE FLUID SOURCE AND MOTOR {47}
533  DF  .~ Pulsator {25}
574  DF  .~.~ Automatic control of plural stage pressure generation or utilization {3}
576  DF  .~.~.~ Of separate movement of plural delivery pistons {1}
577.~.~.~.~ Central externally driven piston drives surrounding piston means through a load responsive connector

DEFINITION

Classification: 60/577

(under subclass 576) Apparatus including a central piston and a second displacer unit in the form of a sleeve about the piston, the sleeve being moved by the piston through a resilient load responsive connecting means.