Shunt enhancement logic circuit

Details Shunt enhancement logic circuit Shunt enhancement logic circuit

1975-02-06

1976-05-25

Blix, Trygve M.

Railway switches and signals

Block-signal systems

Automatic

246 34R, 246128, B61L 2106

Patent

active

039587827

ABSTRACT:
A signaling circuit adapted to be used with railroad tracks or the like for ensuring fail-safe performance in respect to the operation of a control device, such as a track relay, which must function in a fail-safe manner, typically to become deenergized after a set period and to release or drop away when any emergency or failure occurs; thereby to produce a safe action, such as providing a warning signal to the engineer or operator of a train. The signaling circuit includes a quick-acting shunt detector which operates to detect short-duration shunting effects and functions to so extend or enhance them that they produce the desired result of releasing the track relay.

REFERENCES:
patent: 3011050 (1961-11-01), Staples
patent: 3683176 (1972-08-01), Crofts
patent: 3819933 (1974-06-01), Grundy

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