Railway switches and signals – Block-signal systems – Automatic
Patent
1982-02-25
1984-03-20
Groody, James J.
Railway switches and signals
Block-signal systems
Automatic
246 34B, 246 34A, 246 63R, B61L 2100
Patent
active
044376324
ABSTRACT:
The two inputs of a first flip-flop (FF) are alternately energized over a pair of opposite contacts of a code transmitter. Outputs of a second FF alternately enable a pair of logic gates to pass first or second output pulses of the first FF as clock pulses which drive a counter which produces an output pulse after each preselected count X. Each counter output pulse, equal in length to a half cycle of the code, triggers the second FF to its opposite state. A magnetic stick code repeater relay is driven between its two positions by energy supplied from a normally active driver circuit over another pair of opposite contacts of the code transmitter. The driver circuit is optically coupled to be turned off during each counter output pulse, thus inhibiting repeater relay operation during the corresponding half code cycle. This relay holds in its existing position, blanking a half cycle code period, and then is held by the again active driver circuit during the subsequent half cycle. The repeater relay codes the energy supplied to an AC track circuit during train occupancy. When the train clears, the vane type track relay is not responsive to coded energy. However, the long energy period resulting when the repeater relay holds position is sufficient to pick up the track relay to reset the track circuit to normal steady energy condition.
REFERENCES:
patent: 1653358 (1927-12-01), Gilson
patent: 1810940 (1931-06-01), Baughman
patent: 1822088 (1931-09-01), Hailes
patent: 3263074 (1966-07-01), Ihrig
American Standard Inc.
Groody James J.
Williamson, Jr. A. G.
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