US PATENT SUBCLASS 246 / 49
.~.~.~.~.~.~ Intermittent contact

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

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27  DF  .~ Automatic {5}
28 R  DF  .~.~ Electric {18}
41  DF  .~.~.~ Direct current, normally closed, track circuit {4}
46  DF  .~.~.~.~ Line-wire distant control {5}
47  DF  .~.~.~.~.~ Cab signal or train control {2}
49.~.~.~.~.~.~ Intermittent contact

DEFINITION

Classification: 246/49

(under subclass 47) Systems in which an electric current is transmitted from the track into the cab or a local cab-circuit is closed by means of so-called "ramp rails" or intermittent contact plates or rails.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, 34+, 41+, 58+, 95, 98, 128+, and 130, for track-circuit systems.

39, 46, 48 to 53, and 60, for line-wire systems of control.

56, 69+, 74, 85, 92, 195, 229, and 233+, for other systems characterized by an intermittent contact similar to that in this subclass.

167+, and all subclasses noted in the search notes appended thereto, for cab and control features.

SEE OR SEARCH CLASS 104, Railways,

279+, for devices for cleaning ice, snow, and dirt from continuous and intermittent electrical contacts.