US1923353A - Core oven - Google Patents

Description

J. B. WILLSEA Aug. 22, 1933.

CORE OVEN 2 Sheets-Sheet 1- Filed Feb. 19, 1931 11v VIENTOR as A TTORNEY Aug. 22, 1933. J: w 1,923,353

CORE OVEN Filed Feb. 19, 1931 2 Sheets-Sheet 2 INVENTOR uana WZZsea A TTORNEY Patented Aug. 22, 1933 CORE OVEN V Jasper B. Willsea, Rochester, N. Y., assignor to Vfillsea Works, Rochester, N. Y., a-

of New York Corporation" Application February 19, 1931. Serial N0.516,98

1 Claim.

This invention relates to improvements in core .ovens of the kind used in connection with furnaces where cores are used in the molds for eastings.

The'principal object of the invention is to provide a core oven of this kind which is simple in construction, economical in use, and in which thecores maybe properly baked in less time than in core ovens as heretofore constructed.

Another object of the invention is to provide a core oven to which the heated air is admitted at a point or points above its floor but below the cores to be baked, the cool air being permitted to flow from the oven through an opening in its floor.

A still further object of the invention is to provide an oven of this kind having improved means for conducting the heat thereto.

To these and other ends, the invention consists Fig. 1 is a transverse horizontal section of a side walls.

core oven constructed according to one embodi- I Fig. 3 is a vertical longitudinal section of the.

same

Fig. 4 is a fragmentary detail section of one of the lateral hot air conductors;

Fig. 5 is a transverse section of the conductor shown in Fig. 4;

Fig. 6 is a transverse sectional view of the hot air chamber showing how the hot air is received from the furnace, somewhat enlarged, and

Fig. 7 is an enlarged fragmentary view showing a detail in the construction of the hot air chamber.

Similar reference characters refer to the same part in all the figures of the drawings. In molding castings of various kinds in furnaces, it is customary to provide for openings and other formations in the resulting castings, which cannot be readily molded in the sand by means of cores of various forms and sizes which are formed factory floor substantially rectangular in shape and having lateral or side walls 2 and 3, a rear wall 4, and closed at the top by a ceiling wall 5. The front of the oven may be closed by hinged doors 6 and l. The side and rear walls and the doorniay be arranged verticallybetween the floor andceiiing, and together with the ceiling are preferably constructed of suitable heat insulating material. The sides, rear and top of the oven are or may be enclosed in an outer wall of brick or other suitable material.

The heat is supplied to the oven from a furnace having an expansion chamber 8 and pref erably located at the rear of the oven. The heated air from the chamber 8 enters a distributing chamber or conductor 9 througha passageway 10. The passageway 10 is-arranged at or adjacent the fioor of the oven so that the hot air enters at a point adjacent thefloorof the oven. The distributing chamber 9 is arranged horizontally along the {floor of the oven adjacent its rear wall and terminates-at points adjacent its It is preferably constructed of sheet material, built up in a plurality of sections '11, 12 and 13, the middle one 13 having communication with the passageway 10.

The front wall of each of the sections 11, 12

and 13 is provided with elongated outletsopenings 14 arranged above the floor but adjacent thereto. The chamber 8 is formed of greater vertical height than lateral thickness, and the outlets 14 therefrom are arranged near the bottom of its front wall so that the air issuing therefrom is of a substantially uniform temperature.

Arranged in the section 13 between its outlet orifices and the passageway 10 is a vertical baffle 15 which prevents the hot air entering from the passageway 10 from passing directly into the oven through the orifices 14. Arranged above and below each of the openings 14 is an outwardly projecting flange 16. The flanges 16 extend throughout the length of the openings and provide means for directing the hot air outwardly into the chamber above thebottom thereof.

passageways has openings or orifices 20 open ing inwardly'and' similar in all respects to the openings 14 in the chamber 9. By this arrangedistribution of the heat secured than where the arrangement is otherwise. The hot air from, the

oven and leading to the open air.

The hot air entering the chamber 9 from the furnace is admitted to the oven at points spaced from but adjacent the floor and directed inwardly so that it may rise directly through the cores or other articles to be baked and which may be arranged on racks 21 or other suitable supports arranged to support them above the floor of the oven.

The heated air rises in the oven, andby giving up some of its heat to the articles therein, its temperature is somewhat reduced as. it rises.

It also takes a certain amount of moisture from the artitcles. As it cools, it acquires more density and has a tendency to fall to permit the hotter air beneath to rise above it, until finally of the oven, and a short distance inwardly from the front of the oven. The opening may be closed by means of a grating 23 which serves to continue the floor thereovera The opening 22 communicates with a passage 24 under. the floor of passageway 10 has a tendency to heat the walls of the chamber to a high temperature not readily withstood by ordinary metals. For this reason, the-chamber is made in sections, and the middle section 13, which receives the hot'air directly from thefurnace and is therefore subjected to the highest temperature, is constructedof one of the more refractory metals or alloys,- such as ascoloy,

which is more capable of resisting the high tem-' perature. There is another advantage in making this chamber in sections. Owing to the high temperature sometimes attained-by ,themiddle section of the chamber, there are vast temperature changes from its coolest to its hottest temperature not'shared fully by the end sections of the chamber, and resulting in considerable expansionfand contraction which, if the chamber were constructed' of one piece, would constantly move its ends toward and-from the-side walls of the oven,

the

resulting in distortion, wear and injury to its walls. To overcome this difiiculty, the middle section 13 is connected with the end sections in such a manner that it may freely expand and contract relatively thereto.

Referring to Fig. '7, it will be noted that the ends of the sections 11 and 12 are bent inwardly and then outwardly to form loops 25 having substantially parallel walls which form guideways for the opposite ends of the middle section 13. By this construction, the middle section, which heats more rapidly than the end sections, may expand freely, toward they end sections without imparting any movement to the end sections or in anyway impairing its connection with them.

In operation,,the heated air from the furnace enters the chamber 9 through the passage 10 in which it rises and expands, and flows through the orifices or openings 14 and into the passageways 1,8 and 19 and out through the openings therein. The air is directed inwardly from these openings and ascends through the contents of the oven on account of its temperature. The cool air collects on the bottom of the oven and flows out through the opening 22 assisted by the pressureof the 1 incoming air.

Although only. one embodiment of the invention is illustrated and described herein, it will be understood that this application is intended to cover such changes orv modifications as come within the spirit of the invention or scope of the following claim.

I claim:

A core oven comprising a floor, rear, side and top walls, an elongated chamber arranged on the 1 floor adjacent therear wall and terminating at points adjacent the side walls of the oven, a source of heated air, a passageway connecting an intermediate point of said chamber with said source of heated air, openings in the front. wall of said; chamber spaced from but adjacent its bottom and arranged at spaced intervals substantially throughout its length to conduct heated air there- ,fromto the oven and from points below the cores to be baked, a bathe in said chamber in front of 1 said passageway, and an outlet opening in the floor of the oven.

JASPER, B. WILLSEA.

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