US874452A - Muffle-furnace. - Google Patents

Description

No. 874.452. PATENTED DEG. 24, 1907. E. L. STINE. MUFFLB PURNAGB. A PPLIUA'TION FILED M4Y'23, 1906.

3 SHBBTSAHBT 1.

frau

g @nur V ...Lw/...L4

@1,874,452 PATENTED DBG. 24, 1907.

E. L. STINB.

MUPFLB PURNAGE.

APPLICATION FILED MAY 23, 1906.

3 SHEETS-SHEET 2.

/f/c`y,/3.'

DI: d DD DEBBIE E El: DDC :DE

D DEI DE DE) DE DDEE! DCI C] EDEC! DE CCI nl: crm 1:: ik"

l 5.7 gov/VM] No. 874,452. PATENTED DEG. 24, 1907.

E. L. STINE.

MUFFLE FURNACE.

ArPLIoATIoN FILED MAY z3, 190sA s SHEETS-SHEET s.

ky, f.

` will.. www

i, @aff 7740877095665- Uivriiii) sTArEsPATENT OFFICE.

EDWARD L. STINE, OF BUFFALO, NEW YORK,

ASSIGNOR THE REPUBLIC METALWARE COMPANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

MU FFLE-FURNACE To all whom 'it may concern.'

'Be it known that l, EDWARD L. STiNE, a citizen of the United States, residing at `Buffalo, in the county of Erie and State of New York, have inventedv a new and useful Improvement in Muflle-Furnaces, of which the following is a specification.

This invention relates more particularly to the muiile furnaces employed for baking enameled or glazed kitchen utensils and other articles having a similar coating. v

` Oneof the objects of my invention is to improve the construction of the muffley with a view of rendering its walls highly conductive and at the saine timeincreasing their strength, in order to prevent .warping of the same under'the intense heat to which they are subjected..

p The invention has the further object to provide the furnace with an-improved arrangement of air iues for supplying heated air to the iire box to promote combustion.

'In the accompanying drawings consisting 'of' 3-sheets: Figure 1 i's a sectional perspective view of 'a furnace embodying the invention. Fig. 2 is a central longitudinal section thereof.` Fig. 3 isa horizontal section in line 3-3, Fig. 4. Fig. 4 is a transverse section. in line 4 4, Fig. `2. Fig. 5 is an enlarged perspective view of one of the refractory muffle-blocks or bricks. Fig. 6 is a longitudinal section of the same. A

Similar letters of reference indicate corresponding parts throughout the several views. A is. the usual fire-box or combustion chamber, and B the customary longitudinal cold airlines arranged in the lower portions I of its side walls. As shown by dotted lines l and extend nearly to the front end thereof,`

in Fig. 2, these flues communicate with the atmosphere at the rear end of the furnace Specication of Letters Patent. Application filed May 23, 1906. Serial No. 318,412.

vwalls or masonry ofthe furnace.

l end of the furnace, as shown in Fig. 3.

mainor longitudinal portions are in prox- Patented Dec. 24, 1907.

out the length thereof, the same being closed at the rear end of the furnace and its pposite open end being normally closed by the usual sliding door Dl, Figs. Zand 3.

E is the exit flue or passage for the products of combustion arranged between the sides and top of the inuffle and the inclosing This flue communicates with opposite sides of the coinbustion chamber by a series of transverse v passages F located below the bed "or bottom of the inuflle while at its upper rear end it communicateswith the customary chimney flue G.

H, H indicate hot air ilues or passages for supplying heated air to the fire box to promote combustion. These flues extend lengthwise through the lside wallsof the furnace from'its front end nearly to its rear end, as

shown in Fig. 3, thence inwardly adjacent to the closed rear end of the mufHe nearly to the center thereof, thence downwardly to a point below the bottom of the muffle, as shown by dotted lines in Figs. 2 and 4, and thence foi'- wardly into the upper rear portion of .the combustion chamber. The inlet ends of the flues H open into the atmosphere at the ,rmt eir iinity to the hot exit flue E, so that'the cold air in passingl through the same becomes highly heated by the time it reaches the combustion chamber and in this condition-commingles with the-.gases therein, greatly. promoting combustion and producing a high temperature. Owing to the complete combustion thus obtained, slack coal may be burned in the furnace with a natural draft.

The side walls and the arch of the muffle 'Q i are constructed of blocks or bricks d of refractory material, as fire-clay, laid incourses like ordinary bricks. The blocks are preferably provided with tongues ol1 and grooves d2 for interlocking them, those shown in the drawings (Figs. 5 and 6) having tongues at one end and one side and grooves in the remaining end and side. Heretofore, the iniillle has been built np of comparatively thin and long'blocks or slabs, but this construction is objectionable becauseof the narrow contact or supporting edges of contiguous s'labs. and their consequent liability to warp and become displaced in a short time by constantA exposure to the intense heat,

amaca To overcome this obj'ection, l employ com-` i, with the atmosphere and leading to the comparatively thick blocks, as shown, which afbustion chamber, substantially as set forth. 'ford a wide base or bearing surface for the 2. In a mule furnace, the combination of same. ln order to permit the necessary l the combustion chamber, a mufiie arranged conduction or penetration of the heat from l above said chamber lengthwise of the furthe exit flue into the mutlie, each block is nace and separated from the furnace-Walls provided with one or more recesses, cavities by an intervening longitudinal exit-flue for or depressions d extending inwardly from its face nearly to its back. This construel closed at its top and sides to isolate its intion, while producing a strong and stable l terior from said flue, and hot air'flues armuftle which elfectually resists warping of ranged in the side walls of the furnace lengththe blocks, renders the backs of the blocks wise of the muflle and adjacent to said exit sulliciently thin to allow the heat to pass through them. Satisfactory results have been obtained by` the use of blocks nine inches long, four inches wide and four inches thick.

l indicates the horizontal series of blocks o r kickers which span the exit flue E on lopposite sides of the muflle and'serve to retard the escape of the products of combustion into the chimney. These blocks form a tight partition between the upper ,and lower f portions'of the llue except at the front end of ,j the furnace, where a number of openings or passages i are formed for the escape of the products of combustion, as shown 1n Fig. 3. 'llie outer ends of these kickers are preferably embedded in the side walls of the furnace, while their innei ends rest'upon ledges or supports y' formed on ory carried by the ad L jacent courses of blocks, as shown in Figs. 1 & 1l. By this construction the kickers are iirmly supported at their inner as Well as their outer ends and eli'ectually prevented from sagging out of place and allowing the heat to escape too freelyl and ultimately,

` droppingintothe passages F and clogging l cesses terminating short of their backs, the

" closed backs of the blocks forming the inner the same.

l claim as my invent-ion: l. In a muflie furnace, the combination of the combustion chamber, a mulle arranged above said chamber lengthwise of the furnace and separated from the furnacawalls by an intervening longitudinal exit-flue for the products of combustion, and a hot air flue arranged in the side wall of the furnace lengthwise of the muflie and adjacent to said exit-flue, said hot air flue communicating i flue, said hot air flues extending from the front end of the furnace throughout Vthe l length of the exit flue and communicating at their rear ends with the combustion chamber, substantially'as set forth.

3. In a mufle-furnace, the combination of the combustion chamber, a mufle arranged above said chamber lengthwise of the furnace and separated from the furnace-walls by an intervening exit flue for the products l of combustion, and longitudinal'hot air iues arranged in the side walls of the furnace ad i jacent to said exit iiue and extending from l the front end of the furnace throughout the length of said exit| line and thence inwardly g and downwardly adjacent to the closed rear end of the mutlie and into the combustion chamber, substantiallyas set forth. 4. In a muflie furnace, the combination of j the combustion chamber, and a muflie sepal rated from the furnace-Walls by an intervenl ing flue for the products of combustion, the walls of the muttle being constructed of coml paratively thick refractory bloc-ks laid in l courses and provided in their inner sides which face the interior of the muiiie with rewall of said flue' and preventing communica i tion between the same and the muffle, sub- 1 stantially as set forth. l Witness my hand this Sthdayof May, 1906. l y i EDWARD L. STINE. s i Witnesses:

C. F. GEYER, E. M. GRAHAM.

the products of combustion,` the munie being I

Images