US1552835A - Multiple-filament lamp - Google Patents

Description

SeptnS, 1925.

F; P. FOULK MULTIPLE FILAMENT LAMP F11-doom 18. 1920 Patented Sept. 8, 19,25..

UNITED STATES PATENT OFFICE.

MULTIPLE-FILAMENT LAMP.

application mea october 1a, 1920. serial No. 417,541.

To all whom t may concern:

Be it known that I, FRANCIS P. Bfo'omi, a citizen of the 'United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented new and useful Im rovements in Multiple-Filament Lamps, o which the following is a specification.

This invention relates to a multlple filament lamp and has for itsprnnary ob]ect the novel mannerof arranging the filamentand passing current therethrough so that should one or more filaments be destroyed the remaining filaments will continue :to glow thereby preventing the lamps from be coming useless.

An object of the invention 1s the novel manner of arran ing the leads, supports, and filaments so t at a systematic arrangement can be given to thelaments and llght distributed properly thereby greatly 1ncreasing the usefulness of the lamp.

With these and other objects in view the invention will be better understood from the following detailed description taken in connection with the accompanyingdrawing wherein:

. Fig. 1 is a diagrammatic view illustrating the relation of the filaments.

Fig. 2 is a top plan view:

Fig. 3 is a diagrammatlc view, showing the method of wiring nitrogen type lamp.

Again referring to the drawingillustrating my invention the numeral 1 designates the usual glass stem of an electric lamp. This stem has passingtherethrough, at right angles, two leads 2 and 3, one posltive and the other negative. An upper set of supports 4 is arranged directly'below the leads and a lower set of supports 'is connected 40 to the lower end of the stem. The filaments 6 are connected and supported by the supports in a manner to have zigzag formation and are electrically connected to the leads to provide sections 7, 8, 9, and 10, each re? ceiving current independent of the other section as `clearly shown in Fig. 2 so that should one section burn out the remaining sections will continue to glow and this action w-ill continue until each section is burned out hereby materially prolonging the life of the am f In `Figure y3, I have illustrated the usua vnegative current wire a and the usual positive current wire b connected to the leads 2 and 3 so that they may be electrically connected to any source of supply.

It is, of course, yto be understood that any number of leads may be used to provide any number of sections and the filaments may be supported by the stem in other relations, therefore, I do not desire to be limited in any manner except as set forth in the claim hereunto a pended.

Having t ius described my invention what I claim 1s:

An incandescent lamp including a supporting stem, supports radiating from the stem, a filament mounted upon the supports,

l and leads extending from the stem at an 7" angle to each other and disposed alternately between certain of the supports to support and electrically connect the filament in inde pendent groups.

In testimony whereof I affix m si FRANCIS P. IPO

nature. K.

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