US1215118A - Electric lamp. - Google Patents

Description

A. D. COX.

ELECTRIC LAMP.

APPLICATION FILED DEC.22.1915.

1 ,2 11. 5, 1 1 8. Patented Feb. 6, 1917.

a) l m 4 WITNESSES I IIVVEIVTOR 9 4p, 191.5527? 17. Fax,

ATTORNEYS ALBERT now cox,

F WIN TERVILLE NORT H CAROLINA.

' ELECTRIC LAMP.

Specification of Letters Patent.

Patented Feb. 6, 191?.

Application filed December 22, 1915. Serial No. 68,195.

To all whom it may concern:

Be it known that I, ALBERT D. Cox, a States, and a resident State of North'Carolina, have invented a Electric Lamps, of

arranged to be brought into 'anism and certain new and useful Improvement in which the following is a specification. y I

My invention relates to improvements in incandescent electric lamps, and it consists in the combinations,constructions, and arrangements herein described and claimed.

An object of my invention is to provide a lamp having twoseparate resistance or light giving circuits, one of these circuits being operation prior to the other, so that in a case of the burning out of the filament of the first circuit, the second circuit may be. brought into use, thereby increasing the life of the lanip.

A, further object of my invention is to provide a device of the type described in which the switching of the current through the second circuit is accomplished by means of a partial turn of the lamp, thus doing away with any complicated switching mechalso obviating the necessity of removing the lamp from the socket.

A further object of my invention is to provide a lamp having two lighting circuits one candle power or one double that candle features of the invention .will beparticularly till power. I

Other objects and advantages W111 appear in the following specification, and the novel pointed out in the appended claim.

My invention is illustrated in the accompanying drawing forming part of this application, in which:

Figure 1- is a sectional view lamp.

Fig. 2 is a perspective view showing the filament support, and

Fig. 3 is a sectional view of a portion of the device showing the spring contact member in a shiftedposition. a

Fig. 4 is a diagrammatic view showing the circuit connection.v

In carrying out my invention I provide a central filament support 1 of any suitable shape, but preferably of the shape shown in through the and bears at one end a series of outwardly 5 in a little. farther,

' extending arms 2 which support a filament 3. One end of this filament is connected by a conductor 4 with the exterior conducting portion of a screw plug 5, the support 1 being preferably embedded in the plug by means of a suitable filling 6 such as plaster of- Paris or the like. The opposite end of the filament 3 is connected by a conductor 7 with a terminal or contact 8 disposed at the end of the support. This contact 8, it will be observed, is in the form of a spring having a lateral bow or bend at its central portion.

The support 1 is provided with a second set of laterally extending arms 9, these arms supporting a filament 10, one end of which is connected by the conductor 11 with the.

end is firmly secured to the screw plug 5/ The latter is designed to fit any standard socket 15 so that when it is screwed into the socket, the lamp will be retained firmly in position. The bowed portion 8 of the spring contact 8 is not only at the center of the spring but at the center of the screw plug, that is to say, on the axial line of the lamp, so that when the lamp is screwed in, the portion 8 comes into engagement with the contact 14. pass through contact 8, conductor 7, filament 3, and by conductor 1 back to the screw plug- 5, thereby causing the lighting- 'of the lamp by means of the filament 3.

This condition is shown in Fig. 1, and it will be obvious that the filament 10 may be brought into circuit so that the contact 8 will engage the contact 13, whereupon part of the current will flow through the contacts 8 and 13, conductor 12, filament 10, conductor 11, to the conducting portion of the plug 5.- With both filaments in circuit, the lamp of course will give double the drawing. This filament support is made of suitable insulating material, such as glass candle power. It is only necessary to turn the plug a portion of a revolution in order to bring the contacts 8 and 13 together.

This causes a current to arranged to engage the central by screwing the plug This may be done by anyone and thus obviate the necessity of throwing a switch.

One of the advantages of this device is that the life of the lamp is virtually doubled, since one filament may give normal Another advantage of the lamp is that. in cases Where extra light is needed itmay be had at any time by a partial turn of the lamp.

In Fig. 4: I have shown a modified form in which the end. filament carried by the arm 2' is connected with a button 13 while the. other filament carried by the arm 9' is connected with the spring 8' The latter filament therefore lights up first and the filament carried by the arm 2 lights up after the lamp has been screwed up farther. I may use either arrangement without departing from the spirit and scope of the invention.

I am aware that lamps having separate filaments are not new, and such broadly.

I claim I {do not claim An incandescent electric lamp compris-.

ing aninsulating filament support, two.sets of laterally extending. armscarried by said support, a filament carried by, each of said sets of arms, a screw plug secured to one end of said insulating support, said screw plug having a pair of contact surfaces and an inner filling between said contacting surfaces and said insulating support, a

spring contact having a bowed contact portion, said spring contact being secured to theend .of the insulatlng support adjacent to the screw plug and beingconnected to one 7 of said filaments, the other terminal of the filament being connected with theconduCting portion of the screw plug, a contact button carried at the .same end-of said in sulating support and arranged to be engaged by said spring contact, said contact button being connected with the other of said filaments, the opposite terminal of said last named filament being in electrical connection with the contacting surface of the screw plug, and a'bulb inclosing saidfilaments.

ALBERT DOW COX;

Witness:

J. L. RoLLINs.

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