US351869A - William p - Google Patents

Description

(Noiaodi.)

W. P. KOOKOGEY.

INCANDESGBNT LAMP.

Nofsilsg. Patented. Nov. 2, 1886.

mn/@6566. Inventor;

YUNITED STATES PATENT OFFICE.-

'WILLIAM r. KOOKOGEY, or BROOKLYN, NEW YORK;

INCANDESCENT LAMP.- 4

SPECIFICATION forming part of Letters Patent'No. 351,869, dated November 2, 1886.

l Appnmnon filed June 12, 188s.

'To all whom it may concern:

Beit known that I, WILLIAM P. KOOKOGEY, of Brooklyn, in the county of Kings and State of New York, have invented certainnew and useful Improvements in Incandescent Lamps, of which the following is a specication.

My invention relates to filaments or light# giving bodies for'incandescent electric lights 5 and the invention 'consists in a filament having a very thin but broad middle portion to v produce a large radiating-surface with little forms, and,among others, in the form of a dat 'strip widest at its mid-length and narrowing or light-giving surface.

gradually toward its ends, or in the shape of a slender thread having its ends thickened to prevent burning away. The more common forms, however, have very small bodies, and consequently offer an exceedingly high resistance, vbesides being difficult to produce and liable to be destroyed in a short time.

My invention is designed to produce a filament of low resistance but of large radiating This I find produces a light more nearly resembling in appearance the ordinary gas-light, which is commonly deemed desirable. v

In the drawings, Figure 1 is a face view of my improved filament; Fig. 2, a cross-section of the same on the line a: fr of Fig. l; Fig. 3, a top edge or plan View 0f the filament.Y

A indicates the filament as a whole, composed of a crescent-shaped body, a, and ends or terminals b b. The crescent shape of body a causes the light to assume a curve or arched form not unlike that of a gas-dame, andthe broad iiat surface givesa large radiating-face, and consequently large amount of light. Be-

ing wider in the middle than elsewhere, the greatest amount of light will be at the middle,and will gradually lessen toward the ends or terminals b b. The ends b b are thickened in any convenient manner, according to the material of vwhich the filament is made.

-In practice I prefer to cut or form the filai Serial No. 204,982. (No model.)

ment from bond tissue or other tough and fibrous paper, and when such material is employed the 'ends b b may be thickened by rolling, folding, or building up of different thicknesses, and after being brought to proper form the Whole is carbonized in the usualway, when it is ready ,for use.

The body portion should be made as 4thin as practicable, and the ends should be made to present as great or greater cross-section (though in different form) in order that there may not be undue resistance and consequent burning out atl the points of attachment-a fault common to many lamps heretofore made. It is not essential that the lament be curved, nor that, if curved, it be set with the bowed side uppermost.

' The essential feature of the invention consists in making the lament wider or broader at its middle than at its ends and thickening said ends to prevent undue resistance to the electric current thereby.

I do not claim, broadly, either the widening of the central portion or the thickening of the end portions of the lament, separately. considered, my purpose being to produce a filament which shall combine the advantages and avoid the objectionable features of both types heretofore used, as above mentioned.

Filaments having the broadened middle portion without the thickenedl ends offer undue resistance and rapidly burn away at the ends,

and do not givethe greatest intensity of light l in the broad middle portion, where it should be given. Filaments having slender threadlike bodies and thickened ends also offer undue resistance, and do not offer the extent 'of radiating or illuminating surface that is l. A filament for incandeseing eleetrelamps having its middle portion made broader than its ends and its ends made thicker than its middle portion, substantially as and for the 3. A earbonized-paper filament for ineztndesoing electriolam ps having a thin and broad ro middle portion and narrow thickened ends.

5 purpose set forth. WM' P' KOOKOGEY' 2. The herein-described incandeseing elec- Witnesses:

WILLIAM XV. DODGE, XVALTER S. DODGE.

trie -light filament, consisting` of crescentshaped body a and thickened ends b b.

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