US1047541A - Support for metallic glow-filaments for electric incandescent lamps. - Google Patents

Description

' tory oxids.

UnITED STATES PATENT OFFICE.

g ANTON LEDERER, OF ATZGEBSDORF, NEAR VIENNA, AUSTRIA-HUNGARY.

Y k SUPPORT.FQR METALLIC GLOW-FILAMENTS FOR ELECTRIC INGANDESCENT LAMPS.

No Drawing.

To all whom it may concern; v

Be 'itknown that I, ANTON LEoERER, a subject of the Empire of Austria-Hungary, residing at No. 83' 'Atzgersdorf, near Vienna, in the Province of Lower Austria and Empire of Austria-Hungary, have invented .certa'innew and useful Improvements in Supports for Metallic-Glow Filaments for -Electric Incandescent Lamps, of which the following is a specification. This invention relates to improvements in supports for metallic glow filaments for electric incandescence lamps.

Su'pports of refractory. oxids as used with lamps having glow filaments of osmium are not suitable for incandescence lamps having metallic glow filaments other than of osmium. For example, glow filaments of tungsten which burn with an economy of 1' watt per Hefner candle cannot be supported by means of hooks orjeyes made of refrac- It seems that at the points of contact of the lowing filament with the support thereta es place oxidation of the metal and respectively reduction of the support in consequence of'which processes the y filaments are untimely destroyed at these oints.

If electric incandescence lamps havingglow filaments of tungsten the supports of which are made of ids,-'"-are"suppl1edwith alternating current, the phenomena above mentioned occur more rarely in'consequence continuous current whereby of the vibrations'of he filament. However if such a lamp is pl ced'in the circuit of a I thefilament will not vibrate, it will' be foimd, thatv the filament after a short time 12 to 48 hours) e point of contact with the support.

The purpese of the present invention-is to rovide supports mainly consisting of re actor'y OXldS such, for example, as the oxids' of the rare earths, of magnesium,

aluminium 'orofi mixtures of these.oxids-- also with electric' -incandescence lamps, they of, which are of tungsten or glow filaments other metals.' 1

For abetter understanding of this inven--' tion, I will describethe processes already known according to which supports, for

,osmium filaments are manufactured, viz: There is prepared an intimatemixture of about 10jparts by weight of purethpriuni 02nd and about lpart by weight of "magnesia. These oxids, m a finely divided or pow sugar.

. gen;

7 Specification of Letters Patent. Patented Decal? 1912; Application filed August 25, 1906. Serial No. 382,078.

dered condition, are well ground to a paste by the addition of an 'organic viscous binding material, as, for instance, a solution of The paste thus produced is then shaped into flexible filaments, of suitable length, and one end of the filament is' bent,

or fashioned into the form of a small loop, a

hook, or spiral, designed subsequently to engage the osmium filament at the required point of support. The paste filaments 'are then dried, and subsequently burned in free I air until all the organic substance is" consumed. Fina1ly,-they'are subjected to the action ofv a very high tem eratureuntil the particles are sintered or utted together.

-In order to make supports manufactured as above described,suitable for electric lamps having metallic filaments other than osmium I metallize' such supports in the manner hereafter described -:The supports are impregnated With solutions of metallic compounds that :may reduced to metal,

if necessary in name, in order to remove'the gases containedin the supports and to permit of a-more uniform distribution of the liquid in the support. Then the hooks, loops or similarly shaped supports after having been dried (eventually only in free air) are heatedin reducing gases. For example, the

supports manufactured of thorium oxid are impregnated with solutions of meta-tungstic acid, colloidal 'tungstic acid, of the. am-\ moni umor. eventually amino-salts of tungsten,r-the thio-tungstates, then they are dried and heated in suitable vessels at-the required temperature in a current of hydro allowed to cool in the-reducing as. The so cooled supports are all of .a right gray color and even under the microscope no' places ofanoth'er color may be discovered. It is obvidus that the supports may be subjected repeatedly to the process described, in order to lncrease'the metalli'zing of the sup-.

cc of reducing The supports'thus heated are then 109 port of oxid, especially on the surface of By means of the described'process' su portsof oid may be metallized withnear y all difiicultl fusible metals. The so obtained met ized supports of oxid possess fracto oxidsis preferable. 1 $51 7 treatment but in general, the use of re t Y be understood that by first maka ing the strips of the refractory ,oxids withappropriate binding material, drying and sinterlng them and then impregnatin themto such extent as they will receive t e metallic solutions, a small antity of the metal 1 added but this, 0 course, is relatively small. TI unaware that it has been proposed to construct conducting filaments for; incan-Q descent electric lamps of mixtures of re-v fiactoryoxids and metals, but in such in- .The supports produced by the herein described, not being intended stances it is desirable that the metal should largely predominate in order to render the filament conductive.

ducting purposes, serve their function better than would any support having a large portion of metal and furthermore they could not be used as filaments.-

What I claim as m invention, and desire to secure by Letters atent-is 1. Supports v for metallic glow filaments of electric incandescent lampsconsisting of a prei'ponderance of refractory oxids impre nate stantially as-described.

2. Supports for metallic glow filaments of electric incandescent lamps consisting of a' preponderance of refractory I impregnation of difiicultly fusible metal disoxids and v an tributed thoroughly in the mass of the oxids, substantiallyas described; i

Inwitness whereof I have hereunto set my hand in presence oftwo witnesses.

' I ANTQNLEDEREB. Witnes ses: i ALvnsm-S. Hootm, 'AUcUsr FUGGEB.

fprocess or conwith a diflicultly fusible metal, su