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AC and battery backup supply for a railroad crossing gate

  • US 5,022,613 A
  • Filed: 04/26/1990
  • Issued: 06/11/1991
  • Est. Priority Date: 04/26/1990
  • Status: Expired due to Term
First Claim
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1. A crossing lights controller for effecting operation of the crossing lights during normal train operating conditions and during a controller failure mode including,a train sensing input providing one signal condition when the approach of a train is sensed and another signal condition when no train is sensed,a lights control circuit which has power supplied thereto to operate the lights in a flashing condition when the train sensing input indicates the approach of a train,a solid state logic and monitor circuit connected to said input and lights control circuit, said logic and monitor circuit applying and removing power to said light control circuit in accordance with the signals at said input,a source of both AC and DC power, independent of the power to operate the lights in a flashing condition when the train sensing input indicates the approach of a train,and a fail-safe relay connected to said logic and monitor circuit and said lights control circuit, which relay automatically connects said independent source of AC and DC power to operate the lights in the event no power is supplied to the fail-safe relay.

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