US1449627A - Electric incandescent lamp - Google Patents

Description

Mar. 27, 1923.

EL ROHNEH ET AL.

ELECTRIC INCANDESCENT LAMP.

FILED DEC. I4, i921.

Mw' www@ Patented Mar. 27, 1923.

UNITED STATES 1,449,627 PATENT OFFICE.

EMIL ROHNER, OF RHEINECK, SWITZERLAND, AND EDOUARD SIMIC, OF VIENNA,

AUSTRIA.

ELECTRIC INCANDESCENT LAMP.

Application led December 14, 1921. Serial No4. 522,451.

VTo all whom tf/nay concern: i

Be it known that we, EMIL RoHNER, a citizen of the Republic of Switzerland, and EDOUARD SIMIo, a subject of the King of Servia, and residents, respectively, of Rheineck, in the Canton of St. Gall, Switzerland, and of Vienna, in the Republic of Austria, have invented certain new and useful Improvements in Electric Incandescent `Lamps, of which the following is a specification.

The electric incandescent lamps hitherto known most of all have the drawback that as soon as the single ilament has been burnt out or broken they become completely valuelem and have'consequently to be replaced.

Now, it is the object of the present invention to overcome lsuch drawback, the characteristic feature of our invention consisting in that provision is made of a second and independent incandescent filament which, by the aid of a third contact, is adapted to be mounted in the knownelectric lamps irrespective of their form, size o power. Thus,

" if and when the ordinary filament has beeny burnt out or broken-, the second lament is brought into the electric circuit by'means of the said third contact so that the great advantage is gained that the lamp, even though the first ilament has been rendered useless, may be further employed. i

In order that the invention may be clearly understood reference is made to the accompanying drawings, in which: v Fig. .1 shows an elevation, partly in section, ofa first construction and arrangement of our improved electric incandescent lamp, and l Fig. 2 shows a similar view of a modication. v Similar parts are designated by like references throughout theviews and the specifi- Ycation.

In ordinary electric incandescent lamps of the form, for instance, illustrated in Fig. 1, the lamp body or glass-bulb a has centrally mounted therein a iilament support b of lass which, like the bulb, is of the well own construction and provided at the top and near the bottom with a collar b and b respectively. These collars serve for the attachment therein, in star form, of a series of wires c having hooksl at their outer ends to which the filament is secured in the usual4 manner, that is, by attaching one end of the filament to one of the two electric contacts commonly provided and guiding it zigzagwise up and down and over the said hooks in order finally to attach the other end of the filament t the second contact.

As already indicated our invention does not interfere with the constructionand arrangement of ordinary electric incandescent lamps except that the collars b and b are preferably made of a larger size to permit the mounting therein of a second series of wires d. These wires d are also disposed in star form but made rather longer than those designated by c. A second filament, indicated in dotted lines in Fig. 1, is similarly .secured upon the hooked ends 'of the wires d as that described with reference to the wires c and has one of its contacts common with the first filament, the other end, however, being connected to a third contact mounted in the lamp and severely-insulated from and in respectv of the aforesaid second contact. .There is thus a double winding of filament, namely an inner and an outer winding.

The arrangement of the three contacts is the following: I

vTwo of the three contacts remain of the disposition known in electric lamps of the type-commonly used, the positive contact 1 being located 1n thescrew-threaded sleeve c I by means of which the lamp is mounted, and the negative and insulated contact 2 being located in the negative pole-carrying fitting g of the electric lamp. The third contact 3, connecting with a contact member L and the louter lament, is fitted close to the said second contact but is insulated therefrom by means of `a strip -z ofinsulating materia both the contact member h and the strip 'L' being mounted in a recess provided in the aforementioned fitting g.

It will thus be seen that, whereas in the ordinary electric lamps the insulation of the 4 Assuming noW that the inner filament has been rendered useless, the insulating strip 1 is Withdrawn from its recess in the fitting g in order to bring into action the third and hitherto insulated contact 3 with contact member lz, and consequently cause the lighting ofthe outer filament. Supposing, on the other hand, the electric lamp from the beginning to be fitted without the insulating device described, both filaments are simultaneously lighted. In such case and since the filaments are parallelly mounted, the intensity ofV the electric current must of necessity be doubled.

This invention applies equally Well to electric incandescent lamps of other shape, such as to a lamp of the kind illustrated in the modifica-tion, Fig. 2, in which the lilament p is of undulatory form and mounted on the filament support b by means of a series of wires c secured at the circumference of the collar b of said support. In this case, too, we make provision of a second filament g Which is arranged parallel to the first filament and suspended from the collar b' by means of another series of Wires c. The arrangement of the three contacts l, 2, 3, and that of the insulating strip-i and contact member it is substantially the same as hereinbefore described with reference to Fig. l. v

What We claim as novel and desire to secure by Letters Patent is In the herein-described electric incandescent lamp of the kind having two filaments mounted therein, the combination, with a screw-threaded metal sleeve carrying the lamp and a lamp-socket attached to the sleeve and provided with a recess, of a com mon contact located in the said sleeve and connecting with one end of each of the filaments, two other and separate contacts fitted at' the face of the socket, and a switch detachably mounted in the aforesaid recess and comprising a contact member and an insulating member adapted to cover one or the other of the separate two contacts.

In testimony whereof we have hereunto set our hands in the presence of the subscribing witnesses.'

EMIL ROHNER. EDOUARD SIMIC. Witnesses for Emil Rohner: Or'ro FRrrscH, G. W. CHILIN. Witnesses for Edouard Simic:

GUILLERMO PEGKER, HERMANN PFLUG..

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