Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-09-01
1981-07-14
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
324 60C, 340 52H, 340647, 340653, 340661, G08B 2100
Patent
active
042789710
ABSTRACT:
An electric control circuit for a safety apparatus adapted to be actuated by electrically operated actuator, the control circuit including an electric power source, a first storage condenser connected with the power source through a resistor to be charged in a predetermined time constant, a normally open switch interposed between the condenser and actuator to discharge the condenser through the actuator upon closure of the switch, a second storage condenser connected with the power source through a second resistor to be charged in a second predetermined time constant, the first-named time constant being normally larger than the second time constant, a comparator for comparing a first signal indicating the charged voltage of the first condenser with a second signal indicating the charged voltage of the second condenser to generate an output signal therefrom when the first-named time constant becomes smaller than the second time constant, and an indicator for indicating shortage of the charged voltage of the first condenser when received the output signal from the comparator.
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Naito Motoharu
Yasui Toshio
Caldwell Sr. John W.
Myer Daniel
Nippondenso Co. Ltd.
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