Extended life, double coil incandescent lamp
阅读：827发布：2023-11-16
专利汇可以提供Extended life, double coil incandescent lamp专利检索，专利查询，专利分析的服务。并且An electric incandescent lamp has a refractory metal wire coil in series with the lamp filament in order to limit inrush current to the filament. After a short period of lamp operation, a bimetallic switch shorts out the wire coil.，下面是Extended life, double coil incandescent lamp专利的具体信息内容。
1. An incandescent lamp comprising: a gas filled glass bulb sealed at its lower end to the flare of a stem press glass mount; a screw base, having a center contact, attached to the lower end of said bulb; two lead-in wires extending through the stem press of said mount, one of said lead-in wires being electrically connected to said center contact and the other being electrically connected to the rim of said screw base; a coiled tungsten wire filament disposed within said bulb and electrically connected between said two lead-in wires; an inrush current limiting refractory metal wire coil in series with said filament and a thermal switch in parallel with said wire coil, said switch operative to electrically short out said wire coil upon attainment thereof of a predetermined elevated temperature and to maintain said wire coil shorted out during lamp operation.
2. The lamp of claim 1 including means to heat said switch to said predetermined elevated temperature.
3. The lamp of claim 1 wherein said switch is normally open when the incandescent lamp is unenergized.
4. The lamp of claim 3 including means to maintain said switch closed after activation thereof.
5. The lamp of claim 1 wherein said wire coil is proximate said switch in order to heat said switch to its operative temperature within a few seconds after lamp energization.
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