US PATENT SUBCLASS 246 / 56
.~.~.~.~.~.~ 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}
54  DF  .~.~.~.~ Single block {1}
55  DF  .~.~.~.~.~ Cab signal or train control {2}
56.~.~.~.~.~.~ Intermittent contact

DEFINITION

Classification: 246/56

(under subclass 55) Systems in which intermittent contacts or so-called "ramp-rails" are used for establishing electrical connection with the moving train.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

40, for single-block systems.

49, 69, 70, 71, 74, and 195, for intermittent contacts controlling cab-signals and train movements.

85, and 92, for such contacts used with other types of block systems.

167+, and all subclasses given in the search notes appended thereto, for cab and control features. 229, 233, 234, and 235, for intermittent contacts in motor systems.

SEE OR SEARCH CLASS

104, Railways,

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