US991578A - Incandescent electric lamp. - Google Patents

Description

W. R. WHITNEY. INCANDESGBNT ELECTRIC LAMP.

APPLILATION ILED ACG. 19. 1907.

RENEWED SEPT.23,1910.

Patented May 9, 1911.

I/.VTNLSEES' JMVENTH l/IZILLJS H. WHITAEX E Y l ATTYT A 991,578. i Application tiled August 19, 1997', Serial No. 338,311.

WILLIS R. WEITNEY, SCHENECADY,VNEW' XOEK, JAS-SIGNOR CEO GENERAL "ELEC'ERC CQMPAY, ,CQEEORATI-QN 0F NEW YORK.

NCANFESCENT ELECTRC LAMP.

lTo all whom it concern:

Be itknown that I, lVinLis YinTni-r,

.a citizen of the United States, residing at Schenectadyg county of Schenectady, 'State of New York, have invented certain new and useful improvementsl 1n incandescent ElectricLamps, lof which the following is a. specification.

My present invention relates to incandescent lamps and comprises ineenstor holding thec filament or filaments in position in the lamp bulb.

Tungsten, molybdenum, tantalum, fand' .similar refractory elements now being. use d for incandescent lamp filaments have a tendenoy to become soft and plastic Wlieiiheatv ed to high incandescenceJ and filaments oi these materials must ordinarily be anchored OI S11 ported Within the lamp bulb in order that eformation and destructionof the ti1ament may not result when the iilainent is hot and soft.

-'Tl1e 'novel' features of my invention are particularly pointed out .in the appended claims, and for better understandinr thereof, reference should be had to the ollcwing description taken in connection aivitli the accompanying drawing.

. In the drawing, thencandesoent lamp l 1s provided with a'-stem2-l1aving-suitable g supplyl Wires connected with a refractory filament 4 of tungsten or other material having a tendency tion. The lamp stem 2 is provided with a toA sagduri-ng normal operayliidrical glass pedestal 5 projecting up- Ward along the axis of the lamp and serving to support the glass tube-cap 6. This tube-,cap 1s movable longitudinally."along" spring of carbon, as shown in the drawing. The annular tube-cap carries,

refractory. material inert the filament 4.

When thelamp is assembled, thecarbon with respect to spring 7 is compressed somewhat by` pushof the filament 4,

andpooling or otherwise, may occurwithoat Specification of Letters atent.`

vinto a spiral before baking.'

filament, .a

Y longitudinally. on said .st-em,

at its closed end, a filament .support 8 of tantalum, or other .metal .lamenn means power of said spring to during normal heating Patented May 9, itil, Renewed September 23, 19m. Serial No.

materially changing' `the tension .under spring l l The spiral spring ordinary carbon lamp filaments .are made, except, hotter/er, that it should be Wound Such a spring iose its .resilient qualities 'when which tlieiilament is subjected by the spiral does not subjected ment is adequately protected from contamination Awith carbon orvother material: from the resilient support-ing means; i i have illustrated vmy invention as applied to a low voltage or series' lamp, but obviously this spiral spring arran ement could easily ne applied to ,a multipleglament lamp by merely adding additional filament supports'8.

What l claim as new and desire to secure by Letters Patent of the United Stat-es, is,"

i. rEhe. combination ot a refractory metal resilient carbon support therefor, and protective means interposed between said -lament and said support.

` 2, The combination onta refractory metal lil-amont, supporting means engaging there-r with, and a carbon spiral for' resiliently supporting said means.

3. 4The fcombination Aoa lamp stem, a pedestal thereon,

a tubular cap .movable l a spiral Vspring inclosed by said cap and engaging with said may be made much as,

to t-lielieat of the lamp. By the .arrangement described, the tungsten tile:

stem, and -iilament supporting means carried by said ca 4. The combination of a carbon spiral, a

refractory metal filament, and means for holding said spiral under compressionyfand for holding said filamentunder tension.

5. The combination of spring, means for applying the power of said spring to hold the metal filament under tension, and' va glass spring. 6. 'The combinationy of envelop inclosing said a carbon spring, a for applying the hold the filament under tension, and, means for protecting said filament from Vcontamination Aby -said carbonspring. i

spiral carbon 7. The 1 combination iaith refractory i metalflamentgof a resilientcarbon member for. supporting said alanient suitatle

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