US PATENT SUBCLASS 246 / 151
.~.~.~ Detector bars

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

131  DF  INTERLOCKING {8}
143  DF  .~ Manual actuation {3}
147  DF  .~.~ Mechanical locking {5}
151.~.~.~ Detector bars

DEFINITION

Classification: 246/151

(under subclass 147) Subject matter having devices by which any attempt to unlock and shift a switch, signal, or other movable unit of an interlocking plant is restrained by the contact, with one or more wheels of a passing car, of a movable bar longer than the greatest distance between such

wheels.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21, 102, 112, 113, 158, 203, 304+, 310, 311, 313, and 358, for devices of similar structure.