Electric lamp and discharge devices: systems – Electric switch in the supply circuit
Patent
1976-12-06
1978-09-05
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Electric switch in the supply circuit
315 71, 315107, 338219, H05B 3902
Patent
active
041123360
ABSTRACT:
A lamp-starting device for use in a lamp socket adapted to receive the base of a lamp, the device having a pair of electrically-conductive plates disposed in spaced relation in and electrically insulated from each other by a housing of electrically insulating material. An electrical resistor is located between and electrically connects the plates, the resistor being in the circuit when the lamp is initially energized. A temperature-actuated mercury switch is located between the plates, the mercury switch being electrically connected to and located in heat transfer relation to the plate that is adapted to engage the lamp base. The mercury switch electrically interconnecting the plates when the mercury is heated by conductive heat from the lamp socket to bypass the resistor in the circuit after initial energization. The well and expansion tube of the mercury switch are formed in one side of the plate that is adapted to engage the lamp socket, and are enclosed by an electrically-insulating member disposed over the plate side. A conductor is electrically connected to the other plate and extends through the electrically-insulating member and into the tube for electrical engagement with the mercury upon expansion of the mercury when heated.
REFERENCES:
patent: 2110690 (1938-03-01), Zierahn
patent: 2550169 (1951-04-01), Sokoloff
patent: 3868540 (1975-02-01), Passmore
patent: 4005338 (1977-01-01), Rios
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