US1518188A - Method of and apparatus for casting - Google Patents

Description

Dec. 9, 1924. 1,518,188

E. o. EKSTEDT METHOD OF AND APPARATUS FOR CASTING Filed Oct. 4, .1922

INVENTOR W/WEY,

Patented Dec. 9, 1924.

UNITED STATES ERNEST D. EKSTEDT, OF EAST ST. LOUIS, ILLINOIS.

METHOD OF AND APPARATUS FOR CASTINGL.

Application filed October 4, 1922. Serial No. 592,303.

To all whom it may concern:

Be it known that I, ERNEST D. EKSTEDT, a citizen of the United States, residing at the city of East St. Louis, in the county of St. Clair and State of Illinois, have invented certain new and useful Improvements 'in Methods of and Apparatus for Casting, of which the following is a specification.

The object of this invention is to obviate the necessity of the use of a drier in pre paring sand-molds for irregular-shaped objects. The driers themselves are an item of expense and the time and labor in using them involve further expenditure of money, which is rendered unnecessary by the present invention.

A further object of this invention is to improve the art of forming cores without the use of supporting devices to maintain their form while drying.

More particularly, this invention embodies the conception of forming cores to be used in casting metal, said cores to be dried without the use of such supporting devices, as above mentioned, and in such manner that breakage of the cores will be prevented while drying.

In the accompanying drawings forming part of this specification, in which like numbers of reference denote like parts wherever they occur,

Figure l is a plan view of a drier;

Figure 2 is a side elevation of a sand-core broken by its own weight after an attempt to dry the same without the use of a drier and without the use of this invention; and

Figure 3 is a side elevation illustrating this invention.

hen by the use of patterns a sand-core has been made in order to mold or cast in metal the counterpart of the subject-matter of Figure 2 or other irregular-shaped casting, it is necessary, in order to prevent its breaking of its own weight as shown in Fgure 2, to inclose the same in a two-piece drier 1, such as shown in Figure 1. If this is not done, there is no position in which the form shown in Figure 2 or the like, made of sand, can be laid or placed where it will not lose its shape or break of its own weight in the manner shown in Figure 2. For the reasons of expense given above it is desirable to depart from the practice of using a drier.

The use of a drier necessarily involves the manufacture of that element for each core which is made. Inasmuch as cores vary considerably in configuration and many of them are of complicated shapes, it is obviously extremely expensive to manufacture driers to fit various molds and to manufacture them in such manner that they will be easily attached to the core and to be of such a close fit as to maintain the shape of the core.

The applicant is not aware of any known process of forming cores wherein the cores are dried without the use of such drier as above mentioned.

The herein-described method of forming the sand-core makes it unnecessary to use the drier of Figure 1 or any other, and allows the sand, forming the core shown in Figure 3, to be baked just as formed and without the use of a drier or similar means.

The form depicted in Figure 3 is only one of many forms in the production of which this improved method is beneficial. The common characteristic of the forms that will be most benefited by this method are those in which the weight is irregularly distributed.

By comparison of Figures 2 and 3 it will be perceived that the line 2 in each is the same. When this invention is used the cores 3 are united by a union 4 having a depending pedestal or base 5, the said base 5 and all parts of the union 4 being formed of the same material as the cores 3, namely, green sand to be baked. After the baking of a core like Figure 3 the union 4 is knocked away, leaving only the core proper 3, which is to be used in the molding operation. Forms like Figure 3 can be baked without a drier. The connection between the inner ends of the cores 3 and the union 4 is so intimate that there is no tendency to break at the junction between them or at the point 6 or elsewhere, and the provision for the base 5 resting at a point even with the edges 7 of cores 3 prevents sagging in the middle.

While only two cores are shown in Figure 3 yet the same principle can be utilized in forming a stick containing a larger plu- 1 rality of such cores, which principle is that of uniting any plurality of irregular-shaped cores together by means of unions of the same material and having extensions or bases interspersed between them like base 5 and adapted to rest upon the same level as the cores to be dried. 7

Having thus described this invention, I hereby reserve the benefit of all changes in form, arrangement, order, or use of parts, as it is evident that many minor changes may be made therein without departing from the spirit of this invention or the scope of the following claims.

I claim:

l. The herein-described method of forming green sand cores for drying consisting in uniting a plurality thereof together with green sand and forming a base at such juncture adapted to rest on the same level as the cores.

"2. The herein-described method of forming green sand cores for drying consisting in uniting a plurality thereof together with green sand of the same texture and forming a base at such juncture adapted to rest on the same level as the cores.

3. The herein-described method of preparing green sand cores for drying conslstlng in forming therewith a green sand

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