US995435A - Electrical resistance. - Google Patents

Description

F.- BULLING. ELEGTRICAL RESISTANCE. APPLICATION FILED 0014, 1910v 995,435. 1 Patented June 20, 1911.

'2 SHEETS-311E111 1.

WITNESSES INVENTOR 66 14- i P. BULLING. ELEGTRIG'AL RESISTANCE. APPLIGATION FILED 0014,1910 995,435 Patented June 20, 1911.

2 SHEETS-SHEET 2.

47 l y-8 m 1 L. Ji--- I WITNESSES If y E nwzrmm UNITED STATES PATENT orator rmnnnicn BtiLLING, *or 'oBnRUnsnL, NEAR FRANKFORT-ON-THE-MAIN, GERMANY, nssxsivon are THE rno un'rnnes nnnccrme COMPANY, on NEW YORK, "N. Y., A

conrona'rron 01; NEW YORK."

To allwhom 'it may concern: 7 Be it known'that I, FRIEDRICH BoLLiNe, a citizen of the Kingdom of Prussia, and residing in Oberursel', near Frankfort-on-the- Main, Germany, have invented certain new and useful Improvements in Electrical Resistances, of which the following is 'a specification.

This invention relates to electrical resistances and'has for its objects to provide an electrical resistance of simple and practical construction containing certain noveland useful features as hereinafter set forth in the specification, while reference is had to the accompanying drawings which latter are to be understood as merely illustrating my invention and in no way as showing the only possible form of an electricalresistance constructed according to this invention.

In the drawings, Figure 1 is a plan view of a ring formed 'electrical' resistance embodying the invention, Fig. 2 is aside elevation of the terminal ends, partly broken away, Fig. 3 is a fragmentary plan view of the terminal ends partly in section, Figs. 4 and 5 are elevations and plan view respectively of a modified .form of the invention, Figs. Sand 7 are similar views showinganother modification, and Fig. 8 is an elevation showing still another modification of the invention.

In the drawings the reference numeral 10 represents the resistance element. The form and nature of-this element is immaterial for the purpose of this disclosure but :inthe present instance the resistance element is shown as a coating-0f conducting material produced by electrolytical precipitation, or by other process on a strip or leaf 11 of mica or similar insulating material. A second strip 12 of mica or similar material is placed over the strip 11. A clip13 is placed over the edge of the strip 12, one arm 14 of the clip resting on the conductor 10 which latter does not occupy the full width of the strip 11. The two strips 11 and 12 are contained within a flexible covering formed by the inner and outer cover 15 and 16 of thin suitable metal. The outer cover 16 is wider than the cover 15 and the flanges 17 of the former are bent around the edges of the cover 15 and may either be pinched firmly to retain the cover 15 or the two covers may be soldered together.

' ELECTRICAL RESISTANCE.

I Specification of Letters Patent. Patented J 11113 20, 1911, Application filed October 4, 1910. Serial No. 585,205. I

The inner cover is provided with terminal heads 18 formedvby bending or punching the metal outward and to which are secured the terminal contacts 19, 19 insulated therefrom by suitable insulating washers 20. The terminal contacts contact with the clips 13 as shown it being understood that the construction is alike for the two terminals. In .case the resistance is formed as a ring then the ends of the outercover 16 overlap and are soldered as at 21-, and the ends of the inner cover may be vjoined by a clamp 22, which may also be soldered.

' In the form of the invention shown in Figs. 1 and 5 the ends of the inner cover 15 also overlap as at 23 and the heads 2t are made separately from the cover 15 bu t sol dered thereto as. at This form ofv the invention possesses'the advantage that the' cover 15 is easier to make, it being a straightstrip of material with openings 26 for the terminals. The. solder used to secure. the heads '24: 13 preferably soft solder which.

melts when the temperature rises above a predetermined degree thereby causing the heads to fall off and thus automatically cuts off -the current.

In the form shown in Figs. 6 and '7 the two terminal contacts are carried in the one head 27 which latter is provided with a footplate '28 which overlaps the flanges 17 of the outer cover 16 and is soldered around the edges .29, thus completely covering the joints of the two covers. 7

In Fig. 8 the foot plate 28 is inserted under the flanges 17 aforesaid. but otherwise this form embodies the same features as the one. shown in Figs. 6 and 7. It will also be observed that the form of the-head 2 7 with the foot plate 28 is usefulin cases where it is not necessary to use the inner cover 15. In such instances the square foot 28 will take the place of the cover 15 to cover the end of the conducting element and the cover 16.'

The form of the conducting element is,

by side. Or again the element may be made Patent the following 1. An electrical resistance comprising an insulated conductor, 'a covering on each side of the same, one of said coverings being adapted to overlap the other lengthwise to inclose the conductor, terminal contacts secured to one of said coverings and insulated therefrom and conducting members for connecting the said conductor to the said term1-- nal contacts.

2. An electrical resistance comprising an insulated conductor, a cover on each side of the same, said coverings being adapted to overlap their respective ends to inclose the conductor, terminal contacts secured to one of said coverings and insulated therefrom and conducting members for connecting the said conductor to the said terminal contacts.

3. An electrical resistance comprising ,an insulated conductor, a covering on each side of the same, one of said coverings being adapted to overlap the other lengthwise and insulated conductor, a covering for the same,

a terminal headQa foot-plate on which said head is mounted for securing the said head to the said covering and a terminal contact mounted in the said terminal head.

5. An electrical resistance comprising an insulated conductor, a covering for the same,

a terminal head, a footplate on which said head is mounted, fusible means for securing said foot-plate to said covering and a terminal contact mounted in the terminal head. (3. An electrical resistance comprising an insulated conductor, a covering for the same, a terminal'head, a foot plate integral with the latter for securing the said head to the said covering and terminal contacts mounted in the said terminal head.

In testimony whereof I have signed this specification in the presence of two sub scribing .Witnesses.

FRIEDRICH BUT LING.

Witnesses:

EMMIE V. Bonvns, GEORGE Gr. SCHREIBER.

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