Solid state digital running time indicator
First Claim
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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Abstract
A solid state digital running time indicator is energized from the same power source supplying energy to a monitored event. A device for detecting when the power is on initiates a signal to timing circuitry for generating clock pulse signals and control timing signals. In response to an initial timing signal, a memory element reads the information from memory into a counter chain. The clock pulse signals are applied to the counter chain for counting up in predetermined increments of time from the number that is initially loaded into the counter chain from the memory element. Control circuitry writes the contents of the counter chain into the memory element after each predetermined increment of time. The total accumulated running time present in the counter chain is applied to drive and display circuitry for providing a visual indication of the running time of the event being monitored.
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Citations
16 Claims
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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;
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrically energizable solid state running time indicator for selectively accumulating and storing for outputting the total elapsed time a plurality of monitored events are energized, comprising:
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means for energizing said indicator and selected ones of said monitored events; means for detecting the energization of said indicator and one or more of said monitored events for applying a start signal to enable timing circuitry; said timing circuitry including means for generating a clock pulse signal of predetermined constant frequency; counters for each of said monitored events, said counters being responsive to said clock pulse signal applied by said timing circuitry for counting up the time each of said monitored events is energized, the contents of said counters indicating the total running time of corresponding monitored events; switching means for selectively applying said clock pulse signal to one or more of the counters corresponding to said energized events for accumulating the running time said monitored event is energized; memory means interconnected with said counters for storing the total running time each of said monitored events is energized, said memory means having the capability of retaining the stored running time when the indicator is de-energized; control circuitry for initially loading the running time stored in said memory means for each of said monitored events into said counters for each of said monitored events in response to a signal from said timing circuitry generated when said indicator is initially energized; said control circuitry including means for writing the total running time in each of said counters into said memory means after each predetermined increment of time measured by said clock pulse signal for continually updating said memory means with the current accumulated running time of the monitored event; and means for selectively outputting the total running time appearing in each of said counters for the corresponding selected monitored events. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification