US PATENT SUBCLASS 246 / 37
.~.~.~.~.~.~ Impedance bond

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}
34 R  DF  .~.~.~ Varying-current track circuit {9}
35  DF  .~.~.~.~ Propulsion-current return {1}
36  DF  .~.~.~.~.~ Double rail {1}
37.~.~.~.~.~.~ Impedance bond

DEFINITION

Classification: 246/37

(under subclass 36) Systems in which one or both of the traction-rails are divided into sections by insulated joints, the rails being made continuous for the return of the super-imposed direct propulsion-current by inductance-bonds or similar devices, which by impedance prevent the passage of the alternating signal-circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

35, and 36, for the superposition of propulsion-current upon alternating track-circuit currents.

42, 43 and 61, for the superposition of propulsion-current upon direct track-circuit currents.