US1682916A

US1682916A - Electric incandescent lamp

Info

Publication number: US1682916A
Application number: US648371A
Authority: US
Inventors: Lebby States Lee
Original assignee: Corning Glass Works
Current assignee: Corning Glass Works
Priority date: 1923-06-28
Filing date: 1923-06-28
Publication date: 1928-09-04
Anticipated expiration: 1945-09-04

Description

Sept, 4, 1928. Q hfiszfiifi s. L. LEBBY ELECTRIC INCANDESCENT LAMP Filed June 28, 1923 gwoentoz 524265 Lee Lebb y Patented Sept. 4, 1928.

UNITED STATES 1,682,916 PATENT OFFICE.

STATES LEE LEIBBY, OORNIN G, NEW YORK, ASSIGNOB TO OOBNING GLASS WORKS, OI CORNIN G, NEW YORK, A CORPORATION 01' NEW YORK.

ELECTRIC INCANDESOENT LAMP.

Application filed June 28, 1923. Serial No. 648,371.

This invention is an improvement in electric incandescent lamp filaments.

Its primary object is to provide a lamp for projection purpose having a filament composed of a plurality of arallel filament elements mounted so close y together that the rojected images from each element overl p each other, the arrangement of the filament supports being such that notwithstanding the proximity of the filament ele- -ments, arcing between them is prevented.

-In practice the lamp filament comprises a plurality of small bent or substantially U-shaped filament elements, wh1ch collectively form a high voltage filament, the terminals of such e ements being so arranged as to prevent arcin and the elements are mounted side by si e and in parallel relation to each other, and so closely together that the beams projected from the several elements overlap each other, and thus com, bine to form a single powerful beam.

In the accompanying drawing which forms a part of this application, and m which like reference characters refer to like parts throughout the several views Figure 1 represents an elevational V18W of an electric incandescent lamp, apart of the bulb being in section, showing a side view of the filament structure.

Figure 2 represents a perspective view of the filament structure, and

Figure 3 represents an enlarged plan view of the filament structure.

Referring to the drawings, the lamp comprises a globe which is provided with a threaded base 11 of usual construction for fitting the lamp into sockets. tom of the base is a contact 12 that 1s connected with a leading-in wire 13, the contact'being insulated from the base 1n the usual manner, while to the upper part of the base is attached the extremity of a return wire 14.

Carried by the base in the usual manner,

I and projecting upwardly into the globe 10,

is a standard which is, as shown, composed of glass. The

wires

13 and 14 are embedded, in the standard and near the top thereof are joined respectively to a pair of upwardly extending

posts

16 and 17.

Projecting upwardly from the center of the standard 15 between the

posts

16 and 17 is another post 18 that carries a glass insulating body 19. Extending upwardly from On the bot-' the body 19 is a pair of

supports

20 and 21,

the u per extremities of which are bent to provife a pair of

horizontal limbs

22 and 23, res ectively.

As s own, the filament supports are so dlsposed that the

limbs

22 and 23, while parallel to each other, are so arran ed that the bend of the support 20 is direct y 0 pcsite the top of the post 16 on one side 0 the ax1s of the lamp, andv on the other side of the axis the bend ofthe support 21 is opposite-the top of the post 17. A filament 24 is connected to the top of the post 16 and to the end of the limb 22. Another filament 25 is'connected to the bends of both of the

supports

20 and 21, and a third filament 26 is connected to the end of the limb 23 and to the top of the post 17. The filaments thus mounted are side b side and in'parallel relation to each ot er, and so closely together that the beams projected from the several filaments overlap each other, and

thus combine to form a sin 1e powerful beam. The filaments are rmed from lengths of coiled filament wire, and by preference they are bent or substantially of inverted U shape as shown.

This construction is such that the current, on flowing u wardly through the post 16 is carried by the filament 24 to the end of the limb 22.. The current then flows through the limb 22 to the bend of the suport 20, and across the filament 25 to the 11d of the su port 21. Continuing along the length of t e limb 23, the current now flows across the filament 26, and down the post 17 to the return wire 14.

When this construction is used in a 100 volt lamp the potential difierence between the top of the post 17 and the bend of the adjacentsupport 21 will be only 33 volts, while the potential difi'erence between the bend of the support 21 and the end of the adjacent limb 22 will be only 33 volts, and the potential difference between the top of the post 16 and the bend of the adjacent support 20 will be only 33 volts. Thus despite the proximity of the filament terminal there will be no danger of arcing between them.

For the purpose of retaining the filaments in roper relation to' each other, I utilize a plurality of anchor wires 27, each of which consists of a len h of stiff wire having one end embedded 1n the insulating body 19, and its upper end provided with a U-shaped seat 28 tor the filament, such scat being formed by bending the outer end of the Wire, as shown.

Having thus described my invention, what I claim is 1. An electric incandescent lamp having a plurality of substantially U-shaped filaments each formed of a length of coiled filament wire and mounted in parallel planes, the adjacent terminals supporting the filaments having the same potential difference between them as the voltage drop in a single filament element.

2. An electric incandescent lamp having a plurality of substantially U-shaped filaments relatively short in length and formed of coiled wire and mounted close together in parallel planes, the voltage drop between adjacent filament ends not exceeding the voltage drop due to a single filament element.

3. An electric incandescent lamp having a plurality of parallel filaments formed of short lengths of coiled filament wire and arranged close together and electrically conneeted in series, and nonlumino'us connections electrically connecting the ends of the filaments in such a manner that the positive ends of the filament are arranged at one side and the negative ends at the otherrside of the lamp.

4. An electric incandescent lamp having a plurality of parallel substantially short U- shaped coiled filaments arranged close together and electrically connected in series,

and nonluminous connections electrically connecting the filaments in such a manner that the current flows through all the filaments in the same direction.

5. An electric incandescent lamp having a pair of filament supports, the upper ends of which are bent in opposite direction to provide substantiallly parallel limbs arranged close together, a pair of posts to which the leading-in Wires are connected, one post terminating at its top opposite the bend of one support and the other post terminating at its top opposite the bend of the other 6. An electric incandescent lamp having a pair of filament supports terminating in parallel limbs arranged close together, a pair of posts to which the lead-in wires are connected, one post terminating at its top oppo site the end of one limb and the other post terminating at its top opposite the opposite end of the other limb, a relatively short coiled filamentconnected at its ends adjacent the opposite ends of said limbs, and relatively short coiled filaments substantiall parallel with and close to the first name filament and respectively connecting the tops of the posts with the remote ends of said limbs.

In testimony whereof I hereunto afiix my signature.

STATES LEE LEBBY.