US PATENT SUBCLASS 246 / 297
.~.~ Track mechanism

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.~.~ Track mechanism {7}
298  DF  .~.~.~> Single direction
299  DF  .~.~.~> Latch or clutch release {3}
303  DF  .~.~.~> Longitudinal spiral cam
304  DF  .~.~.~> Vehicle-restrained gates and doors {3}
310  DF  .~.~.~> Parallel swing
311  DF  .~.~.~> Longitudinal motion {1}
313  DF  .~.~.~> Vertical motion

DEFINITION

Classification: 246/297

(under subclass 292) Subject matter including signals and gates which are automatically actuated by the energy of the moving vehicle, the devices of this subclass and of the subclasses indented thereunder being classified upon either the mechanism connecting the gate or signal with the track mechanism or upon the function or structure of such mechanism.

SEE OR SEARCH THIS CLASS, SUBCLASS:

111, 125, 260, 293, and 473, and appropriate indented subclasses, for signal structure.

273, 274, 275, 314, and 322+, for various types of track-trips used for actuating movable devices of various kinds.