US2145186A - Connection for filament and lead wires - Google Patents

Description

Jan. 24, 1939. w. J. MEEKER ET AL 2,145,186

CONNECTiON FOR FILAMENT AND LEAD WIRES Filed July 1, 1938 I e V/ mmuwwm I M t n .R t 6 5 A mmm w TL Q WL T .W

Patented Jan. 24, 19 39 a I 4 UNI ED o v I CCONNVEOQTIIO'N I- Wells ,1. Meeker s a... min mal, out, r assignors to General Electrlc'Co npany, a corporatlon of New York p Application my 1, ma, Serial No. 211,000

3 Claims. 176-38) Our invention relates to incandescent lamps, standard base l Additional support is provided radio tubes and other electrical devices enclosed for the mid-portion of the filamentll by the within a sealed bulb or cohtainenand more-par wire ll'which is looped thereabout and has one ticularly to the attachment of the filament orend embedded in the button on the end: of the 5 other resistance element of said devices to the glass arbor I! extending from the stem I 4." 5

inner leads thereof. In this particular instance the filament H is v Usually the filament or the resistance element of coiled-conform, as shown in Fig. 2, and has v of such electric devices is connected to the inner its singly coiled end portions 20 clamped in hooks 7 leads by means of hooks formed by bending back 2| formed on the ends of the lead-in wires l2 10 the end portions of said leads which are closed and 13. Each hook 2|, as shown in the enlarged 10 on the ends of said filament or resistance. When view of lead-in l2 shown in Fig. 2, is formed from the ends of the filament are coiled, the hooks are a flattened, end portion of said lead-in wire closed only enough to hold therfilament securely; which is bent back on itself and which, in this in order to avoid crushing and probable injury instance, is provided on its inner surface with 1 l5 thereto. To close the-hooks the correct amount longitudinal ridges 22 which engage the turns of has, however; proven very diilicult and the said the end portion of the filament. The ridges 22 hooks are some timesnot closed tightly enough are not necessarily spaced the same distance to hold the filament. This condition occurs most apart as the coils of the end portion 20 of the often when the filament and leads are brought filament but tend to hold said filament securely,

20 together manually and clamped. i since theylie approximately parallel to said coils 20 An object of our invention is to provide an and a goodly portion of said ridgesprojects beimproved joint between a filament and a lead-in V tween said coils. The hooks are not closed tight wire. Another object is to provide a lead-in wire 1y since the coils of the filament ends 20 would with a filament-engaging hook so formed as to be crushed and very likely injured. However, the

. 25 hold the filament-securely and prevent injury said coils are usually flattened to acertain ex- 25 thereto even though the hook is closed more or tent as shown in .Fig. 3. The ridges 22 in" the less tightly than normally allowable. Another lead-in wires l2 and II, which in this instance ,object is to provide a lead wire with a filamentarefmade of nickel, usually are also distorted engaging hook having its inner surface so formed somewhat by; the filament cells so that a-, more I as to prevent slipping of the end of a coiled filaelfective electrical connection is;v made. Both the; 30

ment therefrom without the necessity of gripping greater gripping" effect as well asjthe' resilience. the filament so tightly as to injure it. Other fea-, provided by theridgescontribute-to the superiortures and advantages. 01* our invention will be ity of this type of hook since they insure that a apparent from the following detailed description more loosely as well as a more tightly clamped of species thereof, andfrom the accompanying hookrwill hold the filament satisfactorily. 1. 35

. drawing. r Obviously other shapes and forms of protuber- In the drawing Fig. lis a perspective view of ances or'roughenlng than the ridges 22 may be an incandescent lamp embodyinga filament joint provided on the inner surfaces of the hooks 2|.

construction comprising our invention; Fig. 2 is The said surfaces of the hooks ma'y,for instance,

40 an enlarged perspective view showing one end of be knurled to provide diamond-shaped protuber- 40 a filament joined to a lead wire in accordance ances such as shown on the flattened end portion with our invention; Fig. 3 is a sectional view on 23 of the lead-in wire2l in Fig: 4. The said end a still larger $08.18 0f the hooked end Of the lead porfiion' 23 is shown prior to its formation into a, wire with the end of the filament secured therein; hook, p

and Fig. 4 is an elevation. on 'an enlarged scale what w lai a ew a d d ir t e ur by 45 of a portion of a lead wire having an end of Letters Patent of the United States is:

' modified form, said end being shown prior to its 1. In an electrical device comprising a sealed formation into a hook. 3 container, the combination of a closely coiled The incandescent lamp shown in Fig. 1 comfilament in said container and an inner leadof a'refractory metal such as tungsten. The filaon an end thereof clamped around a portion of m. is conn c to h ner ends of the said filament, the inner filament-engaging sur- Ieading-ln Wires-IZ and I3 which extend through face of said hook being roughened to securely the conventional tipless stem .II to the metal grip the turns of said filament.

55 shell I! and end eyelet l6 respectively, of the v 2. In an electrical device-comprisin 8 ea 56 pris bulb n in'which is sealed a filament ll connected thereto, said inner lead having a hook container, the combination of a closely coiled filament in said container and an inner lead connected thereto, said. inner lead having a hook on an end thereof clamped around a portion of saidfilament, the inner filament-engaging surface of said hook having protuberances thereon at least some of which extend into the spaces between the turns of said filament to securely grip 3. In an electrical device comprising a sealed cu ely zripp s t e

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