US816967A - Core-oven. - Google Patents

Description

PATENTED APR. 3, 1906.

A. B. DAY.

. GORE OVEN.

2 SHBETS-SHBET 1.

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APPLIOATION FILED SEPTJB. 1905.

No. 816,967.l

PATENTED APB.. 3, 1906.

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10 Sana" i N W mba/li .Amm

2 BHEBTS-SHBET 2.

A. B.. DAY. CORE OVEN.

APPLIUATION FILED SEPT. 1s, 1905.

ALFRED B. DAY, "F KNOXVILLE, TENNESSEE.

COiEiE-OVEN..

Specification of Letters Patent.

Patented April 3, 1906.

l Application filed September 18.1905. Serial No. 278,873.,

To all whom it may concern:

Be it known that I, ALFRED B. DAY, a citizen of the United. States, residing at Knoxville, in the county of Knox and State of Tennessee, have invented a new and useful lmprovement in Core-(Wens, of which the folowing is a specification, reference being had to the accompanying drawings. l

My improvement relates to core-ovens in which cores to be used in foundries are placed in a compartment through which products of combustion are passed for the drying or baking of said cores.

The object of the invention is to produce such an oven adapted for economical construction and operation and having a maximum capacity and efficiency and adapted to subject the cores placed therein to substantially uniform heat.

In the accompanying' drawings, Figure l is a front elevation of an oven embodying my improvement. Fig. 2 is a plan of the same oven. Fig. 3 is an elevation of the righthand side of the oven, as shown in Fig. 2. Fig. 4 is an upright section of the furnace and the adjacent portion of the oven-chamber. Fig. 5 is a horizontal section through the furnace and oven-chamber.

For convenience in description the side of the apparatus directed toward the bottom of the sheet in Fig. 2 will be termed the front of the apparatus, while the opposite side (that directed toward the top of the sheet) will be termed the back of the apparatus, while the face or side directed toward the right will be termed the right-hand side and the opposite side the left-hand side of the apparatus. Accordingly, Fig. 1 becomes a front elevation, and Fig. 3 an elevation of the righthand side.

Referring to said drawings, A is the furnace, and Bis the oven-chamber. Said ovenchamber has the right-hand wall 1, the front wall 2, the back wall 3, and the left-hand wall 4 adjacent the furnace. Said chamber also has the horizontal bottom plate 5 and the top plate 6. At the middle of the top plate is a tubular neck 7, adapted to receive a stack for carrying off the products of combustion. The lower edge of the left-hand plate 4 does not extend quite to the bottom plate 5, and. from said lower edge a false floor 8 extends horizontally toward the right-hand wall 1, but stops short of the latter, so that products of combustion may pass from the furnace beneath the plate 4 and said false floor, and

thence into the portion of the oven-chamber above said false floor.

The bottom 9 of the furnace A is preferably in the same plane with the bottom of the oven-chamber B, and the bottom plate 5 of said chamber is preferably extended beneath the furnace to also form the bottom of the furnace, and in the same manner the front wall 1() of the furnace may be a continuation of the front wall 2 of the oven-chamber, and the back wall 1l of the furnace may be a continuation of the back wall 3 of the oven-chamber. The left-hand wall 12 of the furnace occupies the space between said. front wall 10 and back wall l1.

From the bottom 9 of the furnace rises an upright wall 13, extending parallel to and a short distance from the left-hand wall 4 of the oven-chamber, said wall 13 extending from the front wall to the back wall of the frunace and rising approximately to the middle of the height of said furnace.

vWithin the furnace-chamber and approximately half-way between the upper and lower edges of the wall 13 a horizontal shoulderplate 14 extends around the furnace-chainber, said plate being of the width of a brick. Upon said plate is placed the brick lining 15, the portion of said lining adjacent the wall 13 extending as high as the upper edge of said wall and the other portions extending as high as the arch 16, which is also composed of brick and rests at its left-hand side upon said lining 15 and at its right-hand side upon a metallic shoulder 17, applied to the adjacent wall 4 of the oven-chamber. Into the space inclosed by the shoulder-plate 14 is placed a grate 18 for supporting fuel. Immediately above the level of said grate a furnace-door 19 is put into the front wall l0 of the furnace, (the brick lining 15 being omitted opposite said door,) and below said door is placed an ash-door 20.

From the foregoing it will be seen th at an indirect flue 21 is formed. between the wall 13 and the bottom of the furnace and the bottom of the oven-chamber, on the one hand, and the wall 4 and the false iioor 8, on the other hand, and that the products of combustion and heatedv air mingled therewith will rise from the space above the grate 18 into the furnace-space directly beneath the arch 16 and pass thence downward through the upright portion of the flue 21, and thence horizontally through the horizontal portion of said flue into the portion of the oven-cham- IOO IIO

ber above said false floor, and thence diverge to all portions of said chamber, and thence escape through the neck 7. It will also be observed that the right-hand and end portions of the lining 15 and the arch 16 constitute insulation-walls, which retard or preventthe passage of heat, while the portion of the end wall 4 below the arch 15 vand also the false floor 8 are metallic, and therefore permit the passage of a portion of the heat of the products of combustion passing through said flue 21 into the oven-chamber above said false floor. While heat is not thus delivered into said chamber through other portions of its walls, the temperature within said chamber is nevertheless balanced or even from side to side and from end to end of the chamber, for the products of combustion rising from said flue into said chamber do not move so readily to portions of the chamber adjacent the lower portion of said wall 4 and said false floor as to other portions.

As already indicated, the flue leading from the furnace into the oven-chamber is indirect and of considerable length. This construction malres possible the completion of the process of combustion before the gases enter the main portion of the oven-chamber.v Consequently none of the cores in the ovenchamber are subjected to the intense heat of the flames, the cores on the lower shelves being subjected to practically the same temperature as those on the upper shelves. Yet while the process of combustion is completed in said flue, a portion of the heat is transmitted by conduction through the walls of said flue into the oven-chamber.

The several walls of the apparatus are preferably formed of plates of cast-iron, and the meeting edges of said plates are preferably joined by flanging one of said edges and laying the iiange against the adjacent plate and passing bolts or rivets C through the flange and plate.

The outside walls of the furnace are preferably extended above the arch 16, so as to form above said arch and within said walls a receptacle for holding a charge of molders sand to be thoroughly dried and at all times vready for use by the molders.

To receive the cores, suitable shelves or supports are placed within the oven-chamber and suitable doors are provided to afford access to the cores while resting upon said supports or shelves. For this purpose the drawings show rotary doors combined with semicircular shelves or racks extending into the oven-chamber when the doors are closed with one side directed outward and extending outside of said chamber when the doors are closed with the other side directed outward. In the front wall 2 of said chamber are placed an upright series of horizontal elongated rectangular doors 22, each having a central upright hub 23, and said wall 2 having between said doors and immediately above the upper and immediately below the lower of said doors and axially in line-with said hubs a bearing 24. A shaft or pintle 25 extends through said bearings and hubs and forms a `rjournal for said doors. The edges of each of said doors at one side of its hub are provided with a ange 26, which overlaps the outer face of the wall 2, while a portion of said door at the opposite side of said hub has along its edges a similar flange 27, overlapping the inner face of said wall 2 when said door is in its normal position, (when the shelf is turned inward.) From the lower edge of each door a semicircular shelf or rack 28 extends horizontally into the oven-chamber. Upon these shelves the cores are placed. It will be seen that each door may be rotated to bring the shelf into or outside of said chamber and that the opening in which it is set may be closed by said door when the shelf is outside'of and also when it is within said chamber and that the flanges 26 and 27 will form stops for an aid in closing said opening when the door is in either of said positions. In the back wall 3 of the oven-chamber another set of doors 22, having similar hubs 23 and having similar shelves 28, are secured by a similar pintle 25, extending through said hubs and similar bearings 24. The shelves attached to said front and said back doors extend approximately to the middle of said chamber. Into the right-hand wall 1 of the oven-chamber are placed an upright series of doors 29, similar to but smaller than the doors 22, and said doors 29 have hubs 23, and a pintle 25 extends through said hubs and bearings 24, and said doors 29 have fianges 26 and 27 like the flanges on the doors 22, and applied to the lower edges of said doors 29 are correspondingly small semicircular shelves 30, which approximately fill the horizontal space between said right-hand wall and the front and rear shelves 28. By this arrangement of the doors and shelves in three walls of the apparatus space is eoonomized and the ovenchamber is given a maximum capacity.

I claim as my invention- 1. In an apparatus of the nature described, the combination of front, rear, top, bottom, right-hand, and left-hand walls forming an oven-chamber, one of said walls having an outlet for'the products of combustion, said left-hand wall extending downward nearly to the bottom wall, a false floor extending from the lower edge of said left-hand wall toward said right-hand wall and filling the space between the front and rear walls, and a furnace located beside said chamber and having a flue extending downward to and communicating with the space beneath said false floor, substantially as described.

2. In an apparatus of the nature described, the combination of front, rear, top, bottom, right-hand, and left-hand walls forming an IOO IIO

oven-channber7 one oi said walls having an l front and rear walls being extended laterally outlet for the products of combustion, said left-hand wall extending downward nearly to the bottom wall, and a furnace located beside said chamber and having a flue extending downward to and coininnnicatinwr with the space beneath the lower edge o" said lefthand wall, substantially as described.

3. In an apparatus ofthe nature described, the combination ol front7 rear, top, bottom, right-hand, and left-hand walls forming an oven-chamber, one of said walls having an outlet for the products of combustion, said left-hand wall extending downward nearly to the bottom wall, the lower portions of said beyond said left-hand wall, walls located between said extended portions of said front and rear walls, forming, with said extensions, a furnace-chamber having a Ilue extending downward to the space beneath said lefthand wall, substantially as described.

In testimony whereof I have signed my name, in presence ol two witnessesJ this 11th day of September, in the year 1905.

ALFRED B. DAY.

Witnesses:

CHARLEs H. SMITH, Crans KEER.

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