US1313746A - Cahaba - Google Patents

Description

Patented Ano'. 19, 1919.

1.0.SHIPTON- ELECTRIC MELTING FURNACE.

APPLICATION FILED FEILB. 1919. 1,313,746.

/M W y II W y INVENTOR @JAJOOIM` M BY f dm ATToRNEY JAMES D. SHIPTON, 0F VANCOUVER, BRITISH COLUMBIA, CAE! 19.13A.

1 ELEcTRic MELTING-EURNACE.

Specification of Letters Patent..

Patented Aug. 19, 1919.

Application sied February s, 1919. `serial No. 275,790.

T o all whom it may concern.'

Be it known that I, JAMEsD.l Snir'ron,A

a citizen of the Dominion of Canada, residt ing at Vancouver, in the province of British Columbia, Canada, have invented certain new and useful Improvements in Electric MeltingFurnaces, of whiclrthe 'following is a specification.

This invention relates to an electric melting furnace which has been particularly designed for. melting brass or other nonferrous metals and is of that class wherein the metal is melted by the radiated heat from the arc between carbon electrodes. A

The objects of the improvements are the deflection of the heat onto the metal to be melted, and the retention of the greater part of it in the lower part of the furnace chamber.

This provision for deflecting the heat of the arc to the lower part of the chamber isl also used as a tilta'ble shelf whereon addi tional metal is placed to be heated by the l.surplus heat from the lower part of the chamber prior to delivery thereto, whereby an economy of heat is effected, time of melting is saved and the upper part of the chamber is not exposed to excessive heat.

The invention is fully described in the following specification, reference being made to the drawings by which it is accompanied, in which:

Figure 1 is a Vertical cross section in a plane parallel to the axis of the electrodes.

Fig. 2 is a vertical section across the axis of the electrodes.

Fig. 3 is an end View ofthe carbon holders and of the brackets in which they are slidably carried.

In these dra-wings 2'represents the outer metal casingl of the melting chamber which is preferably rectangular and is lined with lire-brick as, at 3 with air spaces 4v formed in the brick or in the building of it. The chamber is providedwth an inner lining 5 of special refractory material such as is commonly used in such furnaces. The cover 6 which is relatively permanent and is designed to be removable only when access is required to the interior of the chamber, is provided with one or more charging aper tures which are closed with removable lugs 7.

This melting chamber is mounted on rockers 8 to facilitate pou ring; of the molten metal through the pouring aperture 9, the outlet of which is closed when the furnace is in use, with a brick or slab of refractory material placed on it,

The carbons 10 are slidable through a bushing or sleeve 11 of special refractory electrical,non-conducting material, secured in the-side walls of the mclting'chan'iber.

l.The carbon holders 12 are slid'ably supported in brackets 13 which are secured with suitable insulation 14 to projections 15 formed on the casing 2 of the furnace chamber. They are adjustable by piuions 16, the teeth of which mesh with rack teeth formed on the underside of the slidable part of the carbon holder 12.

On each carbon 10 between the outer end of the sleeve 11 and the adjacent end of the carbon holder 12 a gas check ring 17 of` cast iron is closely slidably fitted and is faced to t closely against the'end of the bushing 11 to prevent escape of the furnace gases around the carbon. and to radiate the heat therefrom before it reac ies the carbon holder 12.

Rockably mounted in the walls of the up-Y per part of the chamber with its axis across those of the carbone 10 is a hollow shaft 18 on which a series of shelf members 19 of refractory, electrical, non-conducting material are secured to form a tiltable shelf conforming closely to the cross section dimensions of the chambers in plan. l'

When the lower part of the chamber is charged with metal to be melted by the heat radiated direct from the arc, the shelf 19 is charged with metal to be 'preheated by such surplus heat as .is radiated. and conducted from the lower part of the chamber, which preheated metalmay later be dumped into the lower part of the chamber and to come under the influence of the heat directly ra- .diated from the arc and form part of the By the attachment of the carbon holderslideways n suitable insulation. to the casing in preheating mlctai to oe-later.

2 of the melting chamber, the carbons do not require to be Withdrawn from the chamber or the current cut off' from them while pouring which is an advantage as the chamber does not cool down and heat is economized.

Having now particularly described my invention, I hereby declare that what I claim as new and desire to be protected in lby Letters Patent, is:

l. In an electric furnace of the class described Wherein is provided an internal chamber and a charging opening, and Wherein the heat of the arc is radiated onto the metal to be melted, means located in the upper part of the furnace chamber for preheating the metal intended later to form a part of the charge in the lower part of the chamber.

2. In an electric furnace of theclass described, means located immediately Aabove the carbons for 'deflecting the heat of the arc on to the metal to be melted, said deflect ing means forming a shelf on which metal may be preheated in readiness to form a later part of the charge.

3. In an electric furnace of the class described, a shelf of refractory electrical nonconducting` material conforx'ning to the cross section plan of the chamber and pivotally supported above the carbons that it may be tiltedto deliver its contents into the lower part of the chamber.

4. In an electric furnace of the class described, vcomprising a metal casing lined` with refractory material, a cover relatively permanently secured, said cover'provided With charging apertures with removable closing plugs, carbons slida'ble through opposite Walls of thefurnace in bushings of refractory electrical non-conducting material, carbon holders slidably mounted on brackets secured on suitable insulation to the casing Wall of the furnace, a metal ring slidably mounted on each carbon and faced to closely t against the outer end of the bushing of the carbon.

In testimony whereof I affix my signature.

JAMES D. SHIPTON.

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