US935990A - Core-oven. - Google Patents

Description

J. J.'JOHNSON.

i GORE OVEN.

APPLICATION FILED 11315.26, 1909.

2 SHEETS-SHEET 1.

J. J. JOHNSON.

CORE OVEN.

APPLICATION FILED FBB.26, 1909.

Patented 0011.5, 1909.

2 SHEETS-SHEET 2.

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'UNITED STATES PATENT OFFTCE.

JOSEPH J. JOHNSON, OF NEWARK, NEW JERSEY.

CORE-OVEN.

To all whom it may concern:

Be it known that I, JOSEPH J. JOHNSON, a citizen of the United States, and a resident of Newark, in the county oi Essex and State of New Jersey, have invented a new and Improved Core-Oven, of which the following is a full, clear, and exact description.

This invention relates to ovens, and particularly to core ovens which are used for drying or baking cores used in molding.

The object of the invention is to produce an oven oi this class which will be simple in construction, the temperature of which can be nicely regulated, and which will have a construction which will enable the oven to be kept constantly iilled.

More speciiically the invention contemplates the use of a plurality of shelves which extend across the interior of the oven so as to support cores which are drying, and these shelves project at the sides of the oven so as to receive green cores which are to be dried or baked. lVhen the cores on the interior are completely dried or baked, the shelves are advanced so that the green cores pass into the interior oi' the oven, while the baked cores pass out of the oven at the other side. In this way cores can be quickly removed without the loss oi a substantial amount of heat, and the output of an oven oi' certain capacity is greatly increased.

A further object oi the invention is to construct the oven in such a way as to control the circulation oi the gases of combustion, and to provide a more direct outlet for the gases, which is to be used to give an increased drait when the fire is being started.

The invention consists in the construction and combination of parts to be more fully described hereinafter and particularly set forth in the claims.

Reference is to be had to the accompanying drawings forming a part of this speciiication, in which similar characters of reierence indicate corresponding parts in all the figures. Figure 1 is a vertical longitudinal section through an oven constructed according to my invention; Fig. 2 is a side elevation oi a portion .of the interior of the oven, and iurther illustrating its construction; Fig. 3 is a vertical cross section through the oven taken substantially on the line 3 3 of Fig. l; and Fig.,4 is a plan showing one of the shelves, one corner being broken away.

Referring more particularly to the parts,

Specification of Letters Patent.

Application filed February 26, 1909.

Patented Oct. 5, 1909. Serial No. 480,173.

1 represents the body or case of the oven, which is of box form and constructed of iron. This body is elongated so that it is rectangular in plan, and in one end on the bottom 2 of the oven, there is provided a iire pot 3 having a grate 4 upon which a iire may be built. This iire pot is built of fire brick, or similar material, and is provided with corner posts 5 which support a cover 6. The gases of combustion escape from the fire pot between the posts and around the edges of the cover 6, -as will be readily understood. Near the middle point of the body it is provided with a transverse main baiile or baiiie wall 7. This wall extends from the bottoni 2 to a point near the cover 8 of the body. Near the upper edge of the iire pot, the bailie 7 is provided with a draft opening 9 which is closed by a damper door 10 attached by a hinge connection 11, and operated by means of a crank l2 on the exterior of the body, as indicated in Fig. 3. The cover 8 is an outer cover, and beneath this cover .S there is an inner or under cover 13 which consists oi a horizontal plate extending completely across the interior of the body, and extending from the end wall 14 adjacent to the lire pol toward the end wall 15 remote from the fire pot. The cover S is provided with an Opening near the wall lst, at which a stack 16 is attached. Under this stack 16 an opening 17 is formed in the inner cover 13, and this opening 17 is adapted to be closed or partially closed by a sliding damper 18, the handle 19 oi which projects out through the end wall 14 of the body. The inner cover' 13 does not reach to the end wall 15, and at its extremity it is connected to a downwardly extending end baiile or baille wall 20 which lies near the wall 15. The wall 2() extends to a point near the bottom 2. ln this way a vertical duct 2l is formed for the gases of combustion near the end wall l5 remote from the iire pot, and the upper extremity of this duct 21 communicates with a duct 22 which is formed between the inner cover 13 and the outer cover 8. This duct leads the gases to the stack or stove pipe 16. The sides of the oven are provided with a plurality of rectangular openings 23, and these openings are preferably arranged in pairs so that there are two openings on each side at the same level. In the illustration I have shown four of these pairs of openings on each side. Near the lower edges oi` these openings, angle brackets 24 are attached, the bodies of which project horizontally from the sides, as indicated in Fig. 3. Adjacent to these angle brackets, doors 25 are provided which are attached by hinge connections 26. On the adjacent faces of the baffle walls, and on the inner face of the end Wall 14, guide cleats 27 and 28 are provided. These guide cleats are arranged in pairs. The guide cleats 27 are provided with anti-friction rollers 29, having gudg'eons 30 which run in longitudinal grooves 31 formed 'in the cleats, as shown. The cleats 28 are provided with depressed faces or recesses 32 which receive gudgeo'ns 33 of similar anti-friction rollers 34. These antifiiction rollers 34 have V-shaped faces 35 which receive Vthe V -shaped grooves 3G whichare formed in edge rails 37 formed on shelves 3S. These shelves are adapted to receive the cores, and they are formed of gratings, as indicated in Fig. 4. Each shelf is of, rectangular form and of a length substantially twice the width of the oven. Each shelf is provided with a vertically extending web 39 which has substantially the same dimensions as the openings 23 in the sides o'f the oven. rIhe side edges of the shelves are received between the rollers 29 and 34,

as indicated in Fig. 1, the shelves being in- 30 serted at the doors 25. The shelves normally have an alternate arrangement, as indicated in Fig. 3, so -that adjacent shelves project at opposite sides of the oven. On the side where the shelf projects from the oven, the door 25 is let down so that it rests upon adjacent angle@ brackets 24. At this time the vertical web 39 of the bracket is disposed at the opening 23 in the wall which is produced by opening the door, so that the 40 shelf itself forms a clo'sure'at this point.

In operating the oven, the melders stand on opposite sides and operate the shelves. Then the cores on a certain shelf have been baked, the shelf is slid longitudinally on the rollers so that the part of the shelf which has been within the oven projects from the oven, and the part which has been projecting from the oven moves into the interior of the oven. In this way the baked coresare carried out of the oven into reach of the attendant, who removes the baked cores 'and places green cores on the projecting part'of the shelf. On the side of the oven opposite tothe projecting shelf, the doors -25 'are'held closed by suitable catches 40. The outersides of the doors are provided with suitable handles 41 forxraising and lowering them. IViththis 'arrangement it should'be understood that the webs of the shelves efectually close the opening when the door is let down for a shelf to project. `The'movement of removing the baked cores :also "advances the unbaked :cores into the oven, vsothatthereis no opportunity forav substantial loss of heat from the oven in this operation. Indeed, it should appear that the Ioven is in continuous operation up toitsl full capacity at every moment.

Referring to Fig. 1, the normal course of the gases of combustion is indicated by the arrows. These gases pass up through the slots in the shelves, the principal portion of the gases passing up directly over the fire pot so as to pass over the upper edge of the main baflie 7 descending -on the right side 75 of this battle so as to pass under the lower edgeof the ba'flie 20. kThe gases then pass up through the duct 21, through the duct 22, and to the stack 16.

The compartment which is formed in the body bythe baffle 7, directly over the fire pot may be considered as the first compartn'ient where the heat will tend to be greatest, while the compartment at the right of the baffle 7 may be considered'as the second com- 85 partment. If the temperature in the second compartment 'should tend to be low, it ymay be raised by opening or partially opening the damper door 10 sothat some of the gases of combustion will pass into it directly from the fire pot. v'It should be understood that the damper 18 is normally closed. In starting up the 'fire in order to give a more direct route for the gases of combustion, and to obviate the necessity of the circuitous path described through the oven, the damper 1S should be opened and the damper 10 closed; the gases will vthen pass from -the iire pot 3 directly vertically through the opening 17 to thestack 16.

The lower Aportion of the second compartment on the bottom 2, may be utilized to bake cores which require a longer time than usual, and access may be had to this compartment through a side door 42, as shown in Fig. 1. In order togive increased width to the shelves, their edgesv extend beyond 'the edges of the openings 23, as indicated in Fig. 2,r so that when the shelves are withdrawn into the interior, short slots 43 are 110 formed vin the sides near the closed doors 25, but these slots, it will be observed, are

substantially closed by the ends of the shelves which lie adjacent to them, 4as will appear from an inspection of Fig. 3.

Having thus described my invention, I claim as new and desire to secure by Letters Patent,-

1. In an oven of the class described, in combination, a body having oppositely disposed openingsk on the sides thereof, shelves mounted to slide in said body having webs on the interior of said body adapted to close said openings, brackets attached to said body on the outer side thereof-adjacent the lower edges of said openings, and swinging doors normally fclosing said openings and adapted to swing down to a horizontal-position restingon said brackets,v said doors being adapted in their horizontal position to support the projecting parts of said shelves, said shelves being of substantially twice the width of said body.

2. In a core drying oven of the class described, in combination, a body having a fire pot therein, a main baiiie wall mounted in said body and dividing the interior thereof into compartments, said baffle wall having an opening therethrough through which gases of combustion may pass directly over said fire pot through the compartment remote therefrom, and a plurality of shelves mounted in said body and adapted to receive the cores.

3. In an oven of the class described, in combination, a body having a fire pot therein, a substantially vertical battle wall adjacent to said fire pot and dividing the interior of said body into a first compartment over said lire pot and a second compartment beyond said fire pot, said baffle affording means for normally guiding the gases of combustion from the fire pot, through said first compartment and then through said second compartment, said baffle wall having an opening therethrough adj acentto said lire pot which may admit gases of combustion directly from said fire pot through said second compartment, and a damper for regulating the flow of gases through said opening.

4. In an oven of the class described, in combination, an elongated body of substantially rectangular form, a fire pot mounted in said body near one end thereof, a verti cally extending main baffle adjacent to said fire pot and dividing said body into a first compartment over said tire pot and a second compartment beyond said fire pot, a second batiie extending downwardly from the upper portion of said body, said baiiie being arranged so that the gases of combustion pass over the edge of said first baffle and under the edge of said second baflie, and a plurality of shelyes secured in said body and adapted to receive cores.

5. An oven of the class described, having an elongated substantially rectangular body, a fire pot mounted in said body at one end thereof, a main baffle extending upwardly adjacent to said fire pot and dividing the interior of said body into a first compartment over said fire pot and a second compartment beyond said fire pot, said main baffle being arranged so that the gases of combustion passing up through said first compartment will pass over the upper edge thereof and downwardly through said second compartment, and a second baffle extending downwardly from the upper portion of said body to a point near the bottom thereof and adapted to have the gases pass under the lower edge thereof, said second bafie forming a duct with an end wall of said body remote from said fire pot to conduct the gases upwardly, said body having a second duct formed near the cover thereof communicating with said first duct and having an exit opening communicating with said second duct.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH J. JOHNSON.

IVitnesses F. D. AMMEN, EVERARD B. MARSHALL.

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