US832511A - Electric furnace. - Google Patents

Description

PATENTED OCT. 2, 1906.

E. A. STOREY. ELECTRIC FURNACE. urmcuxox HLED 311F113, 1905.

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i ELECTRIC FURNACE. APPLICATION FILED BEPT. 13, 1905.

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Q/vi l'ncoaea No- 832,511. PATENTED 0012,1906.

E. A. STOREY.

ELECTRIC FURNACE.

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witness l 1 N lTED STATES EDWIN A. STOREY, OF NEYVARK, NElV JERSEY.

ELECTRIC FURNACE.

Specification of Letters Patent.

Patented Oct. 2, 1906.

Application filed September 13, 1905. Serial No. 278,356.

To all whom it may concern:

Be it known that I, EDWIN A. STOREY, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented new and useful Improvements in Electric Furnaces, of which the following is a specification.

The invention relates to an improvement in electric furnaces designed primarily for fus- 1O ing refractory substances, such as vitrifying enamel or like products of various articles.

The main ob ect of the present invention is the production of a furnace in which the resistance-conductors are connected within the furnace by a slab or case of resisting material of a articular nature.

A rther object of the invention is the production of a furnace constructed in sections and having portions arranged for convenient 2o removal, whereby to permit ready access to the interior of the furnace.

The present invention will be described in detail in the following specification, reference bein had to the accompanying drawings, in

Whic Figure 1 is a view in elevation of a furnace constructed in accordance with myinvention. Fig. 2 is a transverse section through the fur nace pro er. Fig. 3 is a side elevation of the same; i 4 is a longitudinal section on the line 4 4 of ig. 2. Fig.v 5 is a plan view of the furnace, and Fig. 6 is a sectional view on the line 6 6 of Fig. 4.

In the use of the ordinary furnace for vit- 3 5 rifying the enameling material serious objection has been encountered in that the le th of time re uired to effect the result in sue a furnace l, in addition to vitri 'ng said material, highl heat the material 0 the 40 article being ename ed, and owing to the difference in coefficients of expansion of the enamel and article will tend to crack or crease the enamel in cooling. Furthermore, it has been found very difficult in the usual furnace to accurately control the degree of heat or to maintain uniformity therein when once secured.

With the object of avoiding these defects in the ordinai y construction my furnace comprises a furnace proper consisting in a base 1 and vertically-pro ecting walls 2, supported on said base and spaced apart to provide the interior dimension of furnace required. The upper part or top of the furnac 5 5 is made in a single section comprising a to; plate 3 and depending walls 4 to rest squar-iy 'ment transverse the furnace.

upon the upper ends of the walls 2. By this arran ement the cover of the furnace may be move when desired to permit change in the interior of the furnace.

The structure so far described is composed of any desirable refractory material, the Walls of the opening within the furnace being preferably lined with a suitable non-conducting material 5, as asbestos. The furnace proper is opened at front and rear, the former opening being provided with the asbestos-lined closing-door 6, having the usual mica-covered inspection-opening 7, while the rear furnaceopening communicates directly with what I term a tunnel or he t-air chamber, which extends at right ang es to the length of the fur nace and will be more specifically described hereinafter. The base 1 of the furnace is cen trally and lon itudinally recessed for the reception of the feed-screw 8, having an operating wheel or handle 9 located beyond the furnace and mounted at its rear end in a suitable bearing provided at the end of the recess. Tracks 10 are supported on the furnace-bottom on either side of the plane of the feedscrew, being adapted to movably support a truck 11, from which de ends an arm 12, extending to and having t eaded e agement with the feed-screw, whereby revo ution of said screw will move the truck longitudinally of the tracksthat is, lengthwise of thefurnace.

The heating agent of my improved furnace is the electrical current, and its utilizationin the interior of the furnace is gained through a pluralit of carbon or like conductors mounttieal wall of the furnace, similar carbons 14 also arranged in pairs being mounted for lonitudinal movement in suitable o enings formed in the opposite vertical Wal of the furnace, the arrangement being such that the terminals of said carbons are in direct aline- By preference the o enings in which the carbons 13 and 14 are s idably mounted are formed as recesses 15 in the upper ends of the vertical walls 2,

the recesses eing practically coextensive in pth with the thickness of the carbons, so that when the cover-section of the furnace is in place the lower ends of the walls 4 close the mouths of said recesses and thereb provide the walled openings for the reception of the carbons. Each pair of carbons 13and 14 are connected by a bonding-conductor 16, which is connected directly to a source of electricity.

As the heating medium Within the furnace I arrange a slab or casing 17 of a peculiar nature, such as thoria, magnesia, or kaolin,

I which when cold is substantially non-conducnace these carbons are connected with a source of electricity through a bonding-clamp 20 encircling both carbons and connected to the generator by suitable connections. The

carbons I8 are of a length to project through the cover s'ection's of the furnace and rest upon the resistor therein when desired, though it-is to be understood that the o ening within which said carbons are arrange is of such nature as to permit vertical and horizontal adfustment of the respective psi-rs of carbons to adjust the degree 0 heat as desired. It is to be understood that the strips-13 and 14, totogether with the resistor, constitute oneconductor, the strips 18 constitute the other conductor. The resistor is so positioned within the furnace as to be supported immediately above the plane of the movement of the. truck, so that 21 or other articles to be vitrified will on a proper adjnstment of the truck be positioned immediately beneath andslightly spaced from-said resistor. The tunnel or hot-air chamber, which extends at right angles to the length of the furnace and is in open communication at one end with the rear wall of the furnace, is also formedirr sections, comprising a bottom or base 22, side walls 2%,resting upon said base, and a top-wall or cover 24, resting'loosely on the upper ends of the vertical walls.

is construction provides for the ready asee'ss to the hot-air chamber when desired and use of my improved furnace will be fully obvious from the above description, taken in connection with the drawings, it being noted that the interior of the furnace is readily accessible throu h its sectional construction.

. The passage 0 the current through the carbon-conductors of the resistor described will induce ,a great degree of heat within the furnace, which, operating upon the enameling carried by the articles, will flash or uickly fuse said ename'ling without materia ly increasing the heat of the article.

Having thus described the invention, what is claimed as new is- 1. An electric furnace comprising a furnace proper, horizontally-arranged conductors extending through opposite walls of the furnace, a resistor supported by the inner ends of said conductors, and a conductor sup ported by the furnace and movable in a plane at right air has to the plane of thefirst-mentioned con uctorsf 2. An electric furnace comprising a furnace proper, hori-zontallyarranged conductors extending through opposite wallscf the furnace, a resistor supported by the inner of said conductors, and conductors vertically movable in the furnace and arranged to contact with said resistor.

3. An electric furnace comprising a furnace proper, horizontally-arranged conductors extending through opposite walls of the furnace, a resistor supported by the inner ends of said conductors, and conductors vertically movable in the furnace and arranged to contact with said resistor, all of said con ducto-rs being freely movable into and out of operative osition.

' 4. An eectric furnace comprising a furnace proper, horizontally-arranged conductors extending through opposite walls of the furnace, a resistor supported by the inner ends of said conductors, conductors vertically movable in the furnace and arranged to contact with said resistor, tracks supported within the furnace, a truck movable on said tracks, and means for feeding the truck lengthwise of the furnace.

5. In a dielectric'furnace duplicate conductors extending through the walls of the furnac'e, a resistor supported by said conductors, and an additionalconductor adapted to contact withsaid resistor.

In testimony whereof I affix my signature in presence of two witnesses.

EDWIN A. STOREY.

Witnesses:

M. K. WILLOUGHBY, WILLIAM F. Bormnna.

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