US1271280A - Electric furnace. - Google Patents

Description

E. F. CGLUNS.

ELECTRIC FURNMJE.

MPLICAUOH man mAY12,1917..

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or scnnnncranr, new Yoan, lconrm, A concurren/or New Yoan ASSIGNORF TO GENERAL ELECTRIC atacante nennen.

lpecication qf Letters vPatent.

Patented July 2, 191s.

,Application and )ray '12', 1917. serial no: 168,270.

' Toall whom 'it may concern:

Be it known thatI, EDGAR lF. Cocinas, a

A.citizen of the United States, residing at Schenectady, l.

county of Schenectady, State of New-York, have'invented certain new and4 f useful Improvements in Electric l of -whichthe following is a specification.

The present invention comprises an elec# trode arrangement suitable for furnaces 11n which 'industrial operations-are carried.- out, such as. the `melting of metals and the heating of steel for forging, 4annealing, temper-l In furnaces of .this nature it is'desirabl'e that the electrodes should be of rugged construction, and readilyl adjustable for the purpose of regulating the operation of the furnace.

It is the object of my invention to provide a .furnace in which the electrode which'v is subject to deterioration and wearing away by the action of an arc can be readily rel placed with a minimum of cost and interruption of service. With this object in' view, I have provided a furnace containing-an electrical conductor or conductors built into the contai11er"'of the furnace in` fixed relaconfiguration that itv can be readilyA placed to make good-electrical contact with the conductor and when burned away can be easily readjusted or replaced tocontinue the op- A. eration of the furnace.

l n the surface configuration with thel opposingl lthe yelectrodes, and Fig. :2

4bric preferred embodiment of my invention, I have provided electrical. conductors with diverging sides in contactwith which are located movable blocks conforming in surface of the fixed conductors.

features of my invention will be with greater' particular-ity in the The novel explained following description taken in connection with the accompanying' drawing, and as pointed out in the' appended claims.

igure 1 is a perspective view of furnace electrodes whichare constructed in accordance with my invention, part ofthe container` being broken away to show the relationv of is a fragmentary sectional view. of the furnace.

'Referring to the drawing, the furnace comprisesA a container lconsisting of fireor other suitable refractory material reinforced by steel plates 2.' As shown in Fig. 1, the

material to' be heated is contained extendin Furnaces,

easily replaceablev 'and a replaceable conductor of such.

-, tion with said pair withiny a hearthor crucible constituted by the base 3 of the container and upwardly wall 4, consisting of carborundunaV bric Orother suitable heat-conductive refractory material. Located closely adjaf cent tothe Wall lare the opposing faces of which diverge upwardly. Coperating with the conductor constituted'by the rods 5, 6, are replaceable blocks 7, 8, having a surface configuration adapting. them to lit snugly Within the -recess between the sides of the rods 5, 6. Inv the particular form illustrated,

. the blocks 7, 8 have a hexagonal cross section so thatf'when one of the blocks becomes hollowed out otherwise worn by the action of the arc the block may be reversed, or if necessary replaced, andthe operation of the understood that the replaceable blocksv7, 8

may be given any other desired surface configuration which will enable them to make good electrical contact with .the fixed conductors within the furnace.

vIt has been found that this construction is particularly useful in electric furnaces used for the melting of metals, such as brass, 'which after melting may be discharged through the spout 12. The metal during the heating operation is protected from direct heat radiation of the arc by the wall 4 but receives heat by vconduction and by reflection from the Walls of the furnace. Another set of electrodes 13, 14, may be provided ou the opposite'side of the hearth. Structural features of the furnace itself are not part of my 'invention but are described in a Patent No. 1,242,275, issued Oct. 9, 1917,'by Irving R. Valentine.

What I claim as new and desire to secure by Letters Patent of the United States, is,- 1. An electric arc furnace comprising paired electrical-conductors located adjacent each other, one ormore replaceableelectric conductors conforming in surface configuri conductors to make substantially parallel, f prismatic rods '6 consisting of carbon, graphite or the like,

and claimed Contact therewith and a movable electrode cooperating with said replaceable conductor or conductors.

2. An electric furnace comprising a container7 electrical conductors located adjacent each other on the base of said container, replaceable conductive blockselectrically in contact .with said conductors and electrodes projecting through said container in arcing relation with said blocks.

3. An electric furnace comprising prismati'c conductors located adjacent each other on the .base of said furnace and having upwardly diverging sides, a replaceable conelectrode cooperating with saidbloclr to support an electric arc. j

. An electric arc furnace conij'rislng an electrical conductor providing a rr cess, a re" placea-ble conductive block ttedtosaid recess and electrically in Contact with said conductor, and-an electrode projecting in ar'cing relation to said clock.

In witness whereof,` l have hereunto set my hand this llth day of May, 1917.

EDGAR I". COLLNS.

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