US1394055A - Resistance-unit terminal - Google Patents

Description

W. C. WHITE.

RESISTANCE UNIT TERMINAL.

APPLICATION FILED MAR. 15, 1920.

1,394,055. I Paitented 0011.18, 1921.

Inventor: William C. White,

b fi fw l His Attorneg.

WILLIAM G. WHITE,

OF SCHENECTA DY, NEW YORK, ASSIGNOR TO GENERAL E LEGTRIC COMPANY, econronazrion or new YORK.

RESISTANCE-UNIT TERMINAL.

To all whom it may concern:

Be it known that I, WILLIAM G. WHITE, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certaln new and useful Improvementsin Resistance- Unit Terminals, of which the following is a specification.

The present invention relates to conductors of high resistivity and comprises a novel current conveying terminal whereby conductors of this type may be conveniently and efficiently connected in circuit.

It has been suggested heretofore to reduce the resistance of the terminals of resistors by dipping the resistors in carbonizable material and baking it at carbonizing temperature. This method is not always applicable, especially when the resistors COIlSlSt lar ly of close-grained Vitreous matenlal, suc as porcelain.

In accordance with my invention, theresistor is treated with; a suspension of conductive material, so finely divided as to penetrate into the pores of a surface layer of the resistor as well as to superficially coat the same. I preferably provide a terminal thus coated with a coating of metal, preferabl by winding the same with wire.

he accompanying'drawing illustrates in perspective one embodiment of my inventlon.

The rod 1 consists of a vitreous material,

such as porcelain containing in solution a cable. This mixture is squirted in stick form, dried and fired in an ordinary porcelain kiln at temperatures'of about 1340 to 1370 degrees C. Resistors of this particular type do not constitute a part of m present invention, and are described and c aimed in the copending ap lication, Serial No. 365,738 filed by Elmer lfi. F. Creighton.

In order to provide terminals for resistance bodies of the above described class, the finished resistors are dipped in a suspension of finely divided graphite or equivalent Specification of Lette'rs Patent. Pat t d t, 1 1921. Application filed March 15, 1920. Serial No. 365,830.

this term to designate suspensions ofgraphite of colloidal fineness. in water. The suspension of graphite penetrates the surface layer only of the resistance material. The article thus treated is allowed to dry and the excess is then wiped off, leaving at the ends .2 and 3 a glossy black surface Teseii ibling pure graphite. The surface 'film of gra been reduced to such a fine state of subdi-' -state.- For examplefI may dip the endso'f v its is of relatively high conductivity. In

order to protect this film from mechanical injury it is covered with a layer .of metal. As shown on the drawing, a convenient way of covering the graphite contact surfaces-is to wind them with a layer of closely coiled wire 4, 5, consisting of brass, copper, nickel,

or the like. The electrical connection to the" metal contacts 4, 5 may be made by usual base 8. Vhat I claim as new and desire to secure therethrough and containing at the surface portions thereof conductivem'aterial of colloidal fineness of subdivision constituting current conveying terminals. 2. An electrical conductor comprising porcelain and .a conductive oxid of a metal and containing at the surface portions thereof finely divided'graphite and a layer of wire wound on said graphite-filled portions.

3. An electrical conductor comprising a solution of "oxid'of iron in porcelain having the terminal surface layers impregnated.

with graphite of a fineness o'f subdivision equal to that of colloidal graphite and a layer of metal inclosing said terminal surfaces.

4. A conductor of high resistivity comprising a rod of ceramic composition containing a conductive material, a surface layer of aquadag on the terminals of said rod and a layer of wire wound on said terminals over said surface layer. In witness whereof, I have hereunto set my hand this 28th da of F ebrua 1920. WILJIAM C. W IIITE.

spring clips 6, 7, mounted upon an insulatby Letters Patent of the United States is 7 1. An electr cal conductor comprising avitreous material, a conductor distributed

Images