Electric lamp and discharge devices: systems – Automatic substitution of the load device or electrode
Patent
1990-10-22
1992-07-21
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Automatic substitution of the load device or electrode
315 65, 315120, 315312, 362212, H05B 3910
Patent
active
051325942
ABSTRACT:
An incandescent lamp has a first and a second filament, one or the other of which is arranged to connect with the socket voltage in an ordinary lamp socket by way of a bistable thermally actuated switch built into the lamp. Upon initial provision of the socket voltage, the first filament is arranged to connect with the socket voltage and to so remain connected except if the thermal switch were to actuate. Provided the second filament is intact, the thermal switch will indeed actuate after but a few seconds; whereafter this second filament gets connected with the socket voltage, so to remain connected until the socket voltage is removed or until this second filament fails. After the second filament has indeed failed, the thermal switch will not get actuated and the socket voltage will not switch away from the first filament. The initial action of the thermal switch is effectuated by a small amount of heat applied to the thermal switch by a heating resistor powered from the socket voltage by way of the second filament. After the thermal switch actuates, it will remain in its actuated state due to heat supplied to it by the second filament.
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LaRoche Eugene R.
Zarabian Amir
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