US1009129A - Metallic-filament lamp. - Google Patents

Description

0. BIRNBAUM.

METALLIC PILAMENT LAMP.

APPLIOATI-OK nun nov. a. 1910.

1,009,129. v Patented N0v.21, 1911.

. 2/ 2- I M a F122 Q 7 O2 2 3 WITNESSES: U U U INVENTGR OTTILIE iBIRNBAUM. CF VIENNA AUSTRIA-HUNGARY. ASSIGNOR TO WESTINGHOUSE LAMP COMPANY. A CORPORATION OF PENNSYLVANIA.

IvIETALLIC-FILAMENT LAME.

Specification of Letters Patent.

Patented Nov. 21, 1911.

Application filed November 3. 1910. Serial X0. 591,298.

'10 111! wrlmm it may; concern:

lie it known that l, ()rrtmr. Bnzxmmn a mtqeet of the llmperor of fuistria-llun- Portions. There will of course be some eon- 2-.r v. and a resident of Vienna. Austrianprov mrut R lating to MetaHie-Filament Lamps, of which the following is :1 speeitieaso great as when the end portions themselves lion.

Yi 'le an iu'iproverl lamp of this kind in fr m lngr-oz'uing -"erheat 'l.

ln lll tfll filament troops as usually made. the rrw-z -seetior1 of the leading-in wires and inter ;.--lial;e supports to whirl: the filam nts are attarhed is sutlieienttv great to preventia-rua-lv s. N that th ros+ss-y-ti n of the leading-in wires and intermediate supp rts 7 must he made sullieiently great to allow for this tar-tor also in order that they shall not he orerlwated.

there is a teud uev f r the \.-u-uu:n in the lamp hull; to heroine impaired. and for the :drrkened owing to disinii-gr-stion of the u'iaterlal of which the leadi l? gin wires and supports are made. 1.: \\'t" .'t!'. leading-1n \vue of great r russr--':tiou are employed dillieulties oreur when tuning the same into the glass stemof the lamp and in fuel. this operation in such a ease can only be carried out by the exercise i of peeial precautions.

This applies par tir-ularly in the'ease of lamps ltlttn lttl to take a current exceeding one ampere.

The object of the present inv ntion is achieved hy diminishing, the PlOIl-lt'ilfill of heat due to the passage .of current through those portions of the filamentsavhieh are near to the l ading-iii wires and intermediate supports. The :nnount of heat produced by the current in these portions em; he (liminished by rudu zing the resie'tanmr, for instaneu by increasing the effective -.l'u$S-5i"-- tinn of the nd portions f the filament by brow-hing llH. sam while the g neration f h at in the t'lll portions min be eliminated almost entirel by short- .-ir ..-uiting the end Hungary, have invented a new and useful I:

This invention Ptlflt(' to metalfilament e m-Erie lamps and has for its object to prothe leading-in wires and intermediate sup- --h th l h lliif-lz'. viws and internn-diate ll the l ading-in wires and 1 intermediate supports are heated i-:-:.':essivel v and a loop 4 of ermduetin; material conpertioas of adjacent filaments so that almost the whole of the current flows from one filament to the next without traversing the end duet ion of heat. through these end portions, but the tlttlfllt on the leading-in wires and intermediate supports Wlll obviously not be are also heated by the Whole of the current. In both eases, however, the cross-section of ports can he made much smaller than has hitherto been possible.

In the accompanyingdrawings.Figures 1 and 2 represent diagrammatically two arrangements of the filaments in aerordanee with the present invention. The filaments are of course in fact arranged around the glass stem of the lamp, but for the purpose of simplicity are here shown developed in one plane.

referring to Fig. 1 the end portions of the filament 1 which are connected to the leading-in wires 2 and intermediatesupports 3 are provided with hranehes which form parallel paths for the Luz-rent. Tn this nartieular ease the filament is provided near each end with. a kink or bend,

Meets this kink to the loading-in wires .2 or intermediate supports 3. these loops may conveniently eoDSist of the same material the filamentitself. The blllflt'lllllfl' of the filament can he carried out in any suitable manner in which the resis'anee of the end portions of the filament is redneed so that less heat is generated and ronsequently less of the filaments or the intermediate supports with the result. that these end portions are not. heated to the temperature they would attain if they were traversed by the whole of the current. It, will he nhvious that this looping together of the. filaments can only take plaee as regards the intermediate supports, while for the leading-in wires the. cross-section of the end portions of the filament Conner-ted thereto must be increased by providing loops or hranehes as described above. The end portions of filaments adjaeent to one :Huz-tllt'l' ean ohvioustv be caused to toneh over their entire length, in order to short-eirenit these end portions.

The kink or bend in the filament to whieh the loops areattaelu-d or h means of wlrieh the filaments are looped together. is eonveniently produeed after the filaments have been made. in the ease of duetile filaments they can readily he bent by an\' snitahle means, but in the ease of sintered filaments the filaments are heated to a temperature at whieh they heeome pliahle. whereupon the kink is made and the filament allowed to 0001-.

1. in a metal filament eleetrie lamp, the combination with the leading-in wires and intermediate supports, of filaments pi-{wided with a kink near their points of: atta hment to said leading-in wires and intermediat supports, and loops of conducting material passing around said kink and attaehed to the leading-in wires and intermediate supports respectively.

2. in a metal filament electric lamp the combination with the leading-in wires and intermediate supports of filaments attached to said leading-in wires and intermediate supports, the end portions of said filaments heing short-cireuited at a point near their to said leading-in wires and intermediate supports. the filaments which are attached to said intermediate supports being provided with a kink in their end portions and interlooped at said kink.

I). in a metal filament" eleetrio lamp the etnnhinaiion with the heading-in wires and intermediate sii pi iorts 0t filaments attaehed to said leadiugzfin wires and intermediate supports, said fiflaments being provided with a kink in their end portions, the filaments whieh are attaehed to the intermediate supports heir; inter-looped at said kink and the filaments whieh are attaehed to theleading' in wires having loops of COI\(ltt(tlI1f "i!i:\- terial in eontaetwith-the kink and attaehed to the leading-in wires.

in testimon} whereof I have hereunto subscribed my name this 27th day of ()etoher 191.0.

OTTI LI E BIRNR A I i) I.

"itnesses SUSAN Lisuicinza, ADA MARIA BERGER.

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