US PATENT SUBCLASS 246 / 333
.~.~.~ Longitudinal sprial cam

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

270 R  DF  VEHICLE-ENERGY ACTUATION {11}
314  DF  .~ Switches, automatic {6}
322  DF  .~.~ Track mechanism {13}
333.~.~.~ Longitudinal sprial cam

DEFINITION

Classification: 246/333

(under subclass 322) Subject matter including switches which are actuated by devices which are revolved on an axis parallel to the rails by the action of a car device upon a screw, helix, cam, or spiral groove.

SEE OR SEARCH THIS CLASS, SUBCLASS:

303, and 405, for similar mechanism actuating signals and gates.