US PATENT SUBCLASS 246 / 85
.~.~.~.~ 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}
81  DF  .~.~.~ Propulsion-current signaling {3}
85.~.~.~.~ Intermittent contact

DEFINITION

Classification: 246/85

(under subclass 81) Subject matter having traffic-controlling devices actuated or controlled by circuits closed through

intermittent contacts established between the moving vehicle and stationary conductors.

SEE OR SEARCH THIS CLASS, SUBCLASS:

56, 69, 74, 92, and 195, for systems using intermittent contacts.

77+, for systems making use of the propulsion-current.

229, 233, 234+, 254, and 255, for structure of such contacts.

SEE OR SEARCH CLASS 104, Railways,

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