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Solid state digital running time indicator

  • US 4,180,724 A
  • Filed: 03/31/1978
  • Issued: 12/25/1979
  • Est. Priority Date: 03/31/1978
  • Status: Expired due to Term
First Claim
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1. An electrically energizable solid state running time indicator for accumulating and storing for outputting the total time a monitored event is energized, comprising;

  • means for simultaneously energizing said indicator and said monitored event;

    means for detecting the energization of said indicator and said monitored event;

    means for enabling a timing circuit in response to said detecting means indicating the energization of said indicator and said monitored event;

    said timing circuit including means for generating a clock pulse signal of predetermined constant frequency;

    counters for counting up the clock pulse signals generated by said timing circuitry and applied to said counters for accumulating the time said monitored event is energized, the contents of said counters corresponding to the total running time said monitored event is energized;

    memory means interconnected with said counters for storing the total running time said monitored event is energized, said memory means having the capability of retaining stored information when the running time indicator is de-energized;

    control circuitry for initially loading the accumulated running time stored in said memory means into said counters in response to a signal generated by said timing circuitry when said indicator is initially energized;

    said control circuitry including means for writing the total running time from said counter into said memory means after each predetermined increment of time measured by said predetermined clock pulse signal for continually updating said memory means with the current accumulated running time of the monitored event; and

    means for outputting the total running time in said counters when said indicator is energized.

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