US PATENT SUBCLASS 246 / 303
.~.~.~ Longitudinal spiral cam

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

270 R  DF  VEHICLE-ENERGY ACTUATION {11}
292  DF  .~ Signals and gates, automatic {2}
297  DF  .~.~ Track mechanism {7}
303.~.~.~ Longitudinal spiral cam

DEFINITION

Classification: 246/303

(under subclass 297) Subject matter including a track device which is revolved on an axis parallel to the rails by the action of a car-tappet upon a screw, helix, cam or spiral groove.

SEE OR SEARCH THIS CLASS, SUBCLASS:

333, and 405, for similar switch-actuating mechanism.