Communications: electrical – Selective – Having indication or alarm
Patent
1975-12-10
1977-10-25
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
340 79, 340 81R, 340251, 315 82, B60Q 126
Patent
active
040558312
ABSTRACT:
A current winding is connected between an electric current source and automotive lamps for generating a magnetomotive force in response to the amount of current flowing therethrough. A voltage winding is connected in parallel with the combination of the current winding and the automotive lamps for generating an opposite magnetomotive force to that of the current winding. A reed switch is disposed adjacent the current and the voltage windings and is energized to close or open by the net magnetomotive force of the two windings. An indicating lamp is operatively related to the reed switch so as to be energized when the net magnetomotive force becomes lower than a predetermined value because of the interruption in operation of at least one of the lamps. A zener diode is further connected in series with the voltage winding in order to enable indication of the interruption when all of the automotive lamps are inoperative.
REFERENCES:
patent: 3623055 (1971-11-01), Sakurai
patent: 3811107 (1974-05-01), Sakurai
patent: 3868628 (1975-02-01), Sakurai
patent: 3956733 (1976-05-01), Sakurai
Ishida Toshio
Kusumoto Teruo
Sakurai Yasuhiko
Caldwell John W.
Crosland Donnie L.
Nippondenso Co. Ltd.
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