US976248A - Incandescent lamp. - Google Patents

Description

G.- P. ATWOOD.

INGANDESOENT LAMP.

APPLIOATIOX FILED JAN. 3, 1910.

76,24 I Patented Nov. 22, 1910.

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ATTORNEY To aZL- -whom it may (Johann:

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GEORGE F. ATWOOD, 0E NEWARK, JERSEY, ASSIGNOR TO TESTING-HOUSE LAMP COMPANY, A CORPORATION OF. PENNYLVANIA.

IncANnEsoEn'r LAMP.

Specification of Letters Patent.

Application filed January. 3, 1910. Serial No. 536,090.

Be it known that I, GEoRGn F. A'rwoon, a citizen of the United S'tates, and a resident of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Incandescent Lamps, of which the following is a specification.

My invention relates toincandescent lamps, and particularly to means forattaohing and electrically connecting filaments to,

' the'terminal leads thereof.

In incandescent lamps having tungsten and similar fragile filaments, it has'heretdfore been customary to fuse, paste or otherminal leads and other supportsifor the purpose of establishing good electrical connec-v tions between the saidparts. However.

. when the filaments are thus'attached to the supports, they areparticularly susceptible,

to breakage adj acent to'the supports because the rigid connections render them less 'fiexible at those' points. In the present lamp, the filament is, as usual, fused or otherwise rigidly attached at its extremities to its sup- 7 ports but its freedomrofmovement adjacent of Figure .1 extend, in the usual. manner,

' through its stem 3 and. into the bulb, and

their inner ends serve as supports for a coiled or otherwisesuitably shaped filament 4, the extremities of which are preferably fused to the extreinities'of the leads, though they may be pasted :or otherwise attached or united thereto. The end portions of the filament are wound or coiled around, or are otherwise suitably shaped to embrace,

, the end portions of the supporting leads,

so that the movements ofthe filament adja ment supports, and a plurality of tremities of which are united to t -,cent to its points of attachment to-the leads will be limited, the end portions of the fila meiit being thus relieved from undue strains resulting rom its vibrations.

, It will, or" course, be understood that the lamp may be of any other form or type than those illustrated; that the filament may be composed of other materials than tungsten, and that the filament and its supports may be shaped otherwise than illustrated, without departing from-the spirit of the invention.

In Fig. 2 a plurality of parallel filaments- 5 are employed instead of a single'filament, wise rigidly-attach the. filaments to the ter-- as shown in Fig. 1, the object being to increase the flexibility of the filament and to provide a larger incandescent area.

factured from filaments oft-he same size:

1 claim as rn invention: v1. An incan escent lamp comprising filament supports, and. a filament having its end portions coiled. around the supports and its extremities united. thereto. e

2. An incandescent lamp comprising filament supports, anda filament'having its end portions coiled around the supports and its extremities fused thereto. I a

3. An incandescent lamp comprising filament supports, and a filament the endportions of which embrace the end portions of the supports,'-and the extremities of which are united to the supports. a

' An incandescent lamp compris ng pare lel

filaments the end portions of w the end portions of the support e be sup ports.

In testimony whereof, ,I have hereunto subscribed my name this 24th day oi December, 1909.

GEORGE F. ATVVOOD. itnesses G. F. CAFFREY,

. A, YOUNGI-IOLM.

With. this construction also lamps of substantially any desired current capacity may be manu- Patented Nov. eaters. I

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