US PATENT SUBCLASS 477 / 153
.~.~.~.~ Double acting servo

Current as of: June, 1999
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477 /   HD   INTERRELATED POWER DELIVERY CONTROLS, INCLUDING ENGINE CONTROL

34  DF  TRANSMISSION CONTROL {15}
115  DF  .~ Transmission controlled by engine {4}
121  DF  .~.~ By input manifold pressure or engine fuel control {6}
143  DF  .~.~.~ Servo motor timing {5}
153.~.~.~.~ Double acting servo

DEFINITION

Classification: 477/153

Double acting servo:

(under subclass 143) Subject matter wherein the piston is actuated by fluid pressure to engage a gear speed ratio* and is also actuated by fluid pressure to disengage the said ratio.