US1134788A - Electric terminal. - Google Patents

Description

E. WEINTHAum ELECIRiC TERMINAL. APPLDCTGN FlLED-SEPT.18\ 19'4,

y153343558, merma Apr.6,1915.

Witnesses: Inventor:

Ezechiei Weintraub.

- entran STATES 'rafrnnr yorties.

. EZECHIEL YVEINTRAUB, DF LYNN, MASSACHUSETTS, ASSIGNQR TQ GENERAL ELECTRIC COMPANY, A CORPORATION Ol? NEW YORK.

, ployed.

ELECTRIC TERMINAL.

Specification cf Letters latent.

Application led September 1S, 19171. Serial No.486239.

To allai/710m it may concern.

Be it lmoi'vn that I', EziicHrEL Wnin'rnann, a citizen of the UnitedStates, residing vat Lynn, county of Essex, State or" Massachusetts, have invented certain neW and useful Improvements in Electric Terminals, of which the following is a specification.

This application'is a continuation in part of my application, Serial No; 795,559, filed October 16, 1913.

The present invention relates to resist aiices consisting either partly OrWliolIy ot elemental. silicon, and comprises particularly an electrical current connection or terf i minal therefor.

Silicon cannot be efficiently joined to current-conductors by the `means usually em'- One vdifliculty appears to be the formation at higher temperatures of a very thin superficial iilin oi2 oxid which increases the resistance at the terminal and makes the starting of current passagediiiicult; another Ydiiliculty is `caused by the appearance at higher temperatures of thermoelectromotive forces oi, large magnitude which cause local heating at the terminal and a rapid deterioration of the current connection. The diilieulties are the more severe the higher the temperature at which operates.

ln accordance with my invention l have provided a terminal which is united with the silicon surface intimately so as to entirely exclude the air and thus prevent the.

formation of the oXid film and which gives rise to only a small thermoelectroinotive force and consequently inappreciable local heating. This terminal consists of an alloy of silicon and a metal, such as an alloy of silicon and aluminum.

. lin the. accompanying drawings, Figurel shcivsin elevation a silicon heater provided with terminals, 'and Figilis a sectional view of the end of the' silicon resistor and a ter,- minal. f

The particular resistor illustrated, as shown in section in Fig. 2, comprises a core 1 consisting ot' graphite, or other like highly refractory conductor with a rising volt ampere characteristic, and a shell or coating 2 oi. silicon, but my inventionot1 `course is applicable to any form of resistor consisting entirely or in part of silicon. Silicon when cold a high residzance which rapidly decreases with a rise of temperature and the silicon heater`- hence a core of good conducting material enables the silicon to be easily brought to a high temperature at a' moderate voltage. Qn the other hand by properly proportion# ing thex core and shell an increase in voltage drop with increase in current may be secured thus enabliiigthe resistor to be operated Without special regulating or current limit- Patented Apr. 6. E335.l

ing devices. This resistor is described and claimed in my co-pcnding application, Serial (No. 795,559, iiied October 16, 1913, of which the present application is a continuation inpart.

At the end of the resistor I provide a cap B'consisting of cast iron, steel orother re tract-ery metal or alloy which can run at low red heat Without excessive deteriorationdue to oxidation. If desired an asbestos washer el' may oe placed between the cup 3 and the resistor to make a mechanical fit.` Into ,thisspace between the cup 3 and the resistorl is cast the refractory alloy of silicon and a metal, preferably aluminum. This alloy is made by adding aluminum to molten silicon until a homogeneous mixture is made. A similar alloy of copperor even iron may be used but these alloys have the disadvantage of slowly disintegrating into the form of a powder. Any suitable mechanical current connection may be made totlie vmetal shellA 3. Due'to the factthat the` filling 'is cast into Contact With the silicon, it conforms 'zoV or even higher, Without appreciable change or' resistance at the terminals, Without dele terious locallieating at the contact and consequent breaking apart. l y o li/Vliat I claim as new` and desi-re to secure by Letters Patent of the United States,`is: l'. ,An electrical conductor consisting at least in part of elemental silicon and a cur` rent-conveying terminal therefor comprising a' metal cap spaced apart from said con- 'ductor and a mass of a refractory alloy o silicon and a metal adhering tol said silicon y conductor.

2. n electrical conductor consisting at least in part ci' elemental silicon and means, :for'conducting current thereto comprising a conductive material containing aluminum and silicon as constituents.

3.'An electrical conductor comprising elesisting of a refractory materialcontaining 10 mental silicon, 'a metal cap spaced apart silicon and aluminum -as constituents. f from said resistorand a filling of cast con-l In witness whereof, I have hereunto set vducting material therein conforming closely my hand this sixteenth day of September ai with the surface configurationf the silicon 1914.

t@ protect it framl Oxidation. A EZEGHIEL 'vi/Eiferrruiu-.

4. A12. electrical conductor comprising ele- Witnesses: r mental silicon, e metal cap spaced apart Y JOHN A. MCMANUS, Jr.,

ead resistor. and, a filling therein con- FRANK G. HA'rTIE.

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