US PATENT SUBCLASS 246 / 340
.~.~.~.~.~ Double

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}
336  DF  .~.~.~ Longitudinal motion {4}
339  DF  .~.~.~.~ Perpendicular swing {1}
340.~.~.~.~.~ Double

DEFINITION

Classification: 246/340

(under subclass 339) Subject matter in which pairs of connected track devices are used, each moving the switch in a direction opposite from the other.

(1) Note. Both devices of the pair must be located either in front of or behind the switch, for when placed in tandem, with the switch between them, they are not double, but become independent means for switch setting and resetting, respectively.

SEE OR SEARCH THIS CLASS, SUBCLASS:

339, 346 and 353, and appropriate indented subclasses for swinging track mechanism.

343, 349, 355, and 356+, for double trips.