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Dual range speed indicator with acceleration display

  • US 5,166,610 A
  • Filed: 08/02/1991
  • Issued: 11/24/1992
  • Est. Priority Date: 10/02/1990
  • Status: Expired due to Fees
First Claim
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1. A solid state speed indicator for use on railroad locomotives comprising:

  • a display face;

    a first plurality of indicia arranged in an arc on said display face, said first plurality of indicia representing increments of speed;

    speed sensing means for controlling said first plurality of indicia to provide a display simulating an analog display of speed;

    a second plurality of indicia arranged on said display face in an arc of smaller radius but having a common center with the arc of said first plurality of indicia, said second plurality representing multiples of said increments of speed;

    a plurality of decimal numerals on said display face adjacent at least some of said indicia of the second plurality, said decimal numerals being in multiples of ten;

    an acceleration display on said display face providing an indication of acceleration or deceleration of said railroad locomotive;

    acceleration detecting means responsive to said speed sensing means for controlling said acceleration display;

    an overspeed indicator means on said display face providing a visual first indication of imminent overspeed conditions and a second indication of actual overspeed conditions;

    overspeed detecting means responsive to said speed sensing means for controlling said overspeed indicator;

    a planar LED for individually illuminating each of said decimal numerals; and

    range means for selectively controlling certain ones of said planar LEDs for selectively controlling the illumination of zeros in a units'"'"' position of said decimal numerals so as to provide said solid state speed indicator with two display ranges of speed.

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