Lamp with anti-explosion device

Details Lamp with anti-explosion device Lamp with anti-explosion device

2007-08-21

2007-08-21

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

C313S238000, C313S271000

Reexamination Certificate

active

11223514

ABSTRACT:
The invention relates to the field of lamps. An incandescent electric lamp comprises a bulb (100), current-conducting supply wires (103, 104), a filament (105) having turns (A to H) arranged in spiraling fashion around an axis of revolution (102), one end (105a) of the filament being connected to the conductor wire (103), a metal support (108) of which one end (108a) is connected to the conductor wire (104) and the other end (108b) is connected to the other end (105b) of the filament, and a metal bracket (109) which is in electrical contact with one of the ends or one of the turns of the filament and which comprises a substantially straight portion parallel to the axis of revolution of the filament and situated below the filament when the lamp is in its normal operating position. The metal bracket is, for example, at the potential of the end (105a). At the end of lamp life, the filament will sag and come into contact with the metal bracket (109), thus causing a short-circuit and a breaking of the filament, which prevents an explosion of the lamp.

REFERENCES:
patent: 3696265 (1972-10-01), Martin et al.
patent: 3891885 (1975-06-01), Wurster
patent: 4096405 (1978-06-01), Goto
patent: 4384235 (1983-05-01), Bollon et al.
patent: 4801845 (1989-01-01), Kiesel
patent: 4994707 (1991-02-01), Stark
patent: 6717339 (2004-04-01), Marchand

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