US2361405A - Resistor - Google Patents

Description

Oct. 31, 1944. J, J` KOPPLE 2,361,405

RESISTOR Filed July '7, 1942 l N V EN TOR.

dbf/Af I KOPP/5 BY Patented oci. 31, 1944 UNITEDv STATES PATENT .oFEicE BESISTOB John J. xoppie, Brooklyn, N. Y.. minor to The Ohio Carbon Company, Cleveland, Ohio, a corporation of -Ohio Application July 7, 1.942, Serial No. 449,974

(Cl. SG1-6 3) 4 Claim..

This invention .relates to resistance elements and particularly those which are used in the electronic field, particularly in connection with radio, signal or television equipment.

An object of the invention is to provide a shield for the resistor so as to minimize interference in the operation of electronic equipment. SDel ciilcally, the invention includes as an object the provision of means for so shielding the resistor connection thereto..

In the drawing, Fig. 1 is a side elevation, partly in section, of a resistor unit embodying my invention: Fig. 2 is a section taken on the line 2--2 in Fig.. 1; and Fig. 3 is a side elevation, partly in section. of a modified form of resistor unit.

The resistance element with which the present invention is shown embodies a bar of resistance material i0, preferably round in form, from the ends of which project current conducting leads Il. In the form shown in Fig. 1, each lead is electrically connected to the body through the medium of acup-shaped member i4 'of electroconductive material which is attached to each end of the body. Each member is positioned on the body with the open end thereof facing-the other and each open end may engage a band i2 of electro-conductive material, such as copper, which may be sprayed onto each end of the resistor body. The closed end of each member I4 may be apertured to receive the lead ii, the end of which may be swaged to the member or otherwise securely attached thereto, as by soldering. v

The form of shield construction shown in Fig. 1 includes a layer it of current conductive material which is disposed on theouter surface of an isulating casing I6 that embraces the insulating body and preferably projects slightly beyond each end thereof.V Suitable insulating sealing cement may then 4he applied to each end for effecting a moisture proof cap therefor. A

grounded connection 2l may then' be attached to the current conductive material iB.

Tit.:l casing i8 may be made of any suitable insulating material, such as l porcelain. glass, Vresin'ous material, varnished fabric. or any material having suillcient rigidity to withstand handling and retain its tubular shape. yThe current conducting material lli may be copper that isapplied in the form of 'a spray, or it may be a metallic foil that is rigidly mounted on the outer surface of the casing. l

The ground connection may be made to the layer of conductive material i5 in any convenient way, as by soldering thelead 2| directly to the layer, as shown in Fig. 1, or by utilizing a band of current conductive material as shown in Fig. 3. The band maycomprise either a layer of solder or a metallic sleeve which is pressed A firmly onto the layer i5. Y

A modified form of the construction is shown in Fig. 3,- wherein .the current conducting leads H are embedded within the body of the resistance element, whereby the need for current conductive cup-shaped members i4 is obviated. Additionally. the casing maybe molded around the A resistance element and may be made of any insulating resinous plastic material. In such case,

-the ends of the plastic material cover the ends y of the resistance element and thereby form an eiiectire moisture-proof seal for the unit.

A shield embodying the present invention may be readily applied to a-resistance element and easily attached to the grounded connection. The invention effectively shields the resistor and thereby avoids objectionable interference in radio reception, or in any other electrical apparatus in which it may be used.

I claim:

-1. In an electrical resistance unit, an electrical resistance element, a current conducting lead electrically connected to and projecting out of the end of each element, an insulating casing enclosing the element and extending for substan tially thek entire length thereof, and a film of current conductive material enclosing the outer sur face of the casing.

2; In an electrical resistance unit, an electrical resistance element, a casing of insulating material embracing the element. a current conducting lead projecting from each end of the element, a lm of current conductive material enclosing the exterior surface of said casing. and means for sealing each end of the element and casing.

3. In an electrical resistance unit, an electrical resistance element having a. current conducting lead extending from each end thereof, an insulatingucas'ing' enclosing the element, a film of cover surrounding said wall portions and bridging the space therebetween, said insulating cover intimately engaging said wallfportions to form with said electro-conductive member a substantally sealed casing, an electrical resistance element positioned within said casing and connected to said members, a terminal lead attached to each of said electro-conductive members, and a illm oi current conducting material enclosing 10 outer surface of said casing.

JOHN J. KOPPLE.

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