H - Electricity – 01 – J
Patent
H - Electricity
01
J
315/71
H01J 7/24 (2006.01) F21V 25/10 (2006.01)
Patent
CA 1265185
P 1505-43 CA VOLTAGE REGULATED THERMAL PROTECTION APPARATUS ABSTRACT OF THE DISCLOSURE A heat flow detector for protecting against overheating of a lamp fixture energized from a voltage source, even when a dimmer is used for operating the lamp fixture. The detector includes a temperature sensitive switch electrically coupled to the lamp fixture. The switch disconnects the lamp fixture from the voltage source in response to a predetermined temperature. A biasing heater is thermally coupled to the temperature sensitive switch for raising the temperature of the switch sufficiently to operate the switch upon overheating of the lamp. A regulating circuit maintains the required voltage across the heater even upon reduction of the voltage from the source through use of the dimmer. The heat flow detector is placed in the vicinity of the lamp fixture so as to be subject to the same heat flow environmental conditions as the lamp fixture whereby as the lamp fixture gets overheated, the resistor heated up will be sufficient to operate the switch.
517843
Campolo Steve
Garrett Kenneth M.
Leviton Manufacturing Co. Inc.
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