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Crossing bell and flasher

  • US 4,613,103 A
  • Filed: 09/28/1982
  • Issued: 09/23/1986
  • Est. Priority Date: 09/28/1982
  • Status: Expired due to Fees
First Claim
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1. A train detection and indicating system for a model railroad comprising:

  • (a) first and second series connected light detecting means adapted for placement in predetermined spaced relationship along the direction of motion of a model train for detecting normal light and a shadow upon passage of a model train;

    (b) a power supply and means operative upon connection to said source of power to provide a voltage to said first and second light detecting means;

    (c) said light detecting means each being operative to change resistance upon detecting the shadow cast thereon upon passage of the model train;

    (d) comparator means having a first input connected to said detecting means and a second input connected to a source of reference voltage;

    said comparator means being operative to change signal state at the output thereof in response to one of said light detecting means sensing model train shadow, and providing a voltage above said reference voltage;

    (e) an oscillator operative upon connection to said comparator means output to emit an output signal at a predetermined desired frequency;

    (f) flasher means operative in response to said oscillator output to provide an alternating visible signal.

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