US1008809A - Incandescent lamp with drawn-metal-wire filament. - Google Patents

Description

K. .FARKAS. v

INGANDESCENT LAMP WITH DRAWN METAL WIRE FILAMBNT; uPLIgATIon IILED JUNE 23, 1911.

1,008,809. Patented Nov. 14,;191 1.

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KARL FARKAS. OF GLEN RIDGE, JERSEY.

INCANDESCENT LAltIP WITH DRAWN-METAL-WIRE FILAMEN'IE i ,oossoo.

Application filed June 23,

To all 1137mm it may concern:

IQ it known that L Kain, Famus, a citizen oi" the Kingdom o't Hungary, and a resitlent o'l (ilen Ridge, county of Essex, and htateot New Jersev. have invented certain new and useful improvements in Incandescent Lamps with DrawteMetal-lYire Filaments of which the tollowing is a specification.

This invention has reference to improvements in metal filament lamps and pertains tnu'tieulartv to that type of lamps which are provided with drawn metal wire filaments as an lllttttttltrt'ttit. Such drawn metal wire tilament may consist of one crmtinuous piece of tine wire which is wound successively and alternately over the insulated sttpports or anchors near the ends of the glass rod within'the lamp and connected with its ends to the two lends. This arrangement however is detective owing to the longitudinal expansion of the tine metal wire during the operation of the latnp. \Vhen this tine wire is heated to incandeseenre it throughout its entire length to such a degree as to be undesirable or impracticable. It is self-evident that the longitudinal expansion of such a tine relatively longwire arranged in a rather limited space and passing from anchor to anchor down to the leads where its ends are permanently secured is such as to bulge out the single sections of the wire and press them too hard against the inner walls of the anchor loops.

It; is the special purpose ol' this lllVtlltlUtl to avoid the above described deficiencies of a drawn metal wire lamp and still retain the good qualities of same without incratsing the cost of their imtnutaeture. This has been primarily attained by .lividing the wire length into two portions which has been rendered possible for practical purposes by the construction of a novel interior stem with a rod or arbor provided witlr a condur-tive means in the lower portion of the rod whereby such division is effected. Aes cordingly there are two wire lengths within one lamp and the longitudinal expansion has been redu ed to one half which answers the practical requiremtait in the manutacture of lamps with drawnmetal wire tilaments while the costly cementing ot' the single hair pin loops of the former metallie lilament lamps is also avoided in order to makethe in e a it entirely Specification of Letters Patent,

expands Patented Nov. 14, 1911.

1911. Serial No. 635,012.

drawing in which Figure 1 represents in elevation ifi'iftiip with drawn u'tetatwire filament embodying in desirable form the present improvements. Fig. shows in top plan view the upperpart of the rod or arbor, Fig. 3 is a like top plan view of the lower portion of said rod or arbor, and Fig. 4 illustrates in elevation somewhat in perspective view the lower po'rtion of the interior stem on an enlarged scale.

Similar characters of reference denote like parts in all the figures.

In the drawing in Fig. 1 (t represents the lamp globe. is the interior stem. 0 the rod or arbor, (Z the drawn wire filament of a refractory metal and c the lamp socket. The lamp is made, exhausted and tinishedin the same mannt. as other lamps havingdrawn wire filaments of a refractory metal StiClt tungsten for instance. The tine drawn metal wire filament. however eonsists of two set:-

clear reference is made to the accom mnying tions for the reasons above stated. In orderto render possible the continuous passage of the current through both portions of the filament the novel glass stem with rod shown in detail in Fig; 4 on an enlarged scale is provided. The hollow stem proper 7) has the usual solid glass portion 7) through which the leads f pass. The rod or arbor 0 made oi glass as usual is fused to the top portion 1) of the stem l\ rim 1- is formed on the rod c right above the solid portion 6 of the stem Z). The rim supports a plurality of anchors of even number which are insulated by the glass of the rim and merely act as mechanical supports for the single sections of the drawn metal wire. filament (Z.

A like rim i at the top of the rod supports a corresponding number of insulated anchors plus two, acting also solely as mechanical supports.

in order to divide the continuous filament into two portions il-1G horizontal auxiliary lead it. is fused into the rim 0 as shown. This lead is preferably straight and has two tree ends so that there are new tour free ends for the tour free. ends of the two portions of the drawn wire filament, the two other free ends being the l ads proper f. The one portion of the drawn wire filament starts at one lead ,1 and passes successively and alternately over three top anchors, two bottom anchors and is secured to thcone tree end of the auxiliary lead. lhe current then may pass through the auxiliary lead into the second portion of the drawn wire filament whose one end is secured to the second end of said auxiliary lead. This second portion also passes over three top anchors and two bottom ancho'rs while its second free end connects with the second lead proper thereby completing the circuit.

In the described manner the longitudinal expansion of the filament is reduced to one half in accordance with the division of the long'drawn wire filament into two portions preferably of equal length while the costly cementing of the single hair pin loops is rendered unnecessary and the deformation of the expanding filament is reduced to a practically permissible degree, leaving the single loops of each portion practically straight during use. As above described and shown each portion of the drip? wire filament consists of three loops. owever any even number of loops with necessary anchors may be provided accordingto requirement, l

I claim as my invention 1. An incandescent lamp with drawn metal wire filament divided into two portions comprising an interior stem with leads and rod, a rimon said rod near the stem, an auxiliary lead in said rim, a plurality of insulated vanchors secured therein, and

.a corresponding number ofanchors plus two secured to the top of the rod.

2. A metal wire filament lamp comprising an interior stem with leads and rod, arim on said rod near the stem, an auxiliary lead in said rim, a plurality of. insulated anchors secured therein, and a metal wire filament composed of two portions and supported by the anchors, each portion being connected with one end to one lead proper and with the other to one end of the auxiliary lead.

3. A tungsten wire filament lamp comprising an interior stem with leads and rod,

a rim on said rod near the stem, an auxiliary lead in said run to effect a division of the filament into two portions, a plurality of insulated anchors secured therein, and a' corresponding'number of anchors plus two secured to the top of the rod to connect with the ends of the auxiliary lead.

4. A tungsten wire filament lamp comprising an interior stem with leads and rod, a rim on said rod near the stem, an auxiliary lead in said rim, a plurality of insulated anchors secured therein, and a drawn metal wire filament composed of two portions and supported by the anchors, each portion be ing connected with one end to one lead proper and with the other to one end of the auxiliary-leads I 5, In a tungsten Wire filament lamp having a stem with leads, a glass rod or arbor fused to the stem, a rim on said rod near the stem, an auxiliary lead in said rim, a plurality of insulzted anchors secuied there in, a rim at the of'the rod, and a plurality of anchorsgigf like number plus two secured to said to trim of the rod.

' 6. Ina tungsten wire filament lamp having a stem with leads and a rod fused thereto with a rim in its bottom and top portions, a horizontal auxiliary conductive lead in the bottom rim, a plurality of insulated anchors of even number therein, a plurality of insulated anchors plus two in the top rim, and a metal wire filament composed of two portions, the one portion being connected with one end to one lead'then assing over half the number of the top and ottom anchors and connecting with its second end to one end of the auxiliary lead, the second portion being connected with one end to the second end of the auxiliary lead then passing over the remaining top and bottom anchors and connecting with its second end to the second lead, thereby completing the circuit.

' Signed at New York, N. 1 this 22nd l/Vitnesses ConINNE MYnRs, VERA PAptsEN.

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