US2460218A - Foundry flask - Google Patents

Description

Jan. 25, 1949. w. M. DUNCAN FOUNDRY FLASK Filed Sept. 28, 1945 Patented Jan. 25, 1949 William Mellen Duncan, Alton,

Duncan Foundry and Machine Ill., assigner to Works, Inc.,

Alton, Ill., a corporation of Illinois Application September 28, 1945, Serial No. 619,125

1 claim. (C1. 22-rn This invention relates to foundry asks and sand to be retained therein requires some sort of reinforcement. Numerous methods and devices have been used for this purpose but none have been fully satisfactory.

Heretofore attempts have been made to reinforce sand in a mold by embedding jagger bars The object of this invention is to obviate these defects and to provide an economical and more practical means for retaining molding sand in the cope of the molding flask.

The invention will now be described in more detail with reference to the following drawings, in which:

Figure 1 is a plan View of the cope of a molding flask provided with reinforcement in accordance with this invention;

Figure 2 is a cross section of an entire flask assembly along the indicated line 2 2 of Figure 1;

Figure 3 is a perspective view form of reinforcement; and

Figure 4 is a perspective view ned form of reinforcement.

This invention a plurality of wire grills of metal supported on of a modified of another modiparticles flow freely laterally upon impaction and thus embed the reinforcing metal lattice no lines of cleavage. These grills become an in# tegral part of the mold in which they-are emare arranged'and designed so as The present invention contemplates that the cumulative cross sectional area of the members 5 and 5 does not exceed one-half the total area of the grill l. Such a grill provides sucient cross-section. Ease and practicality of construc- Where the vertical and horizontal members are of dierent cross-sectional area or shape, the diameters of the dimension thereof, as preferably one-fourth lineal dimension of a contiguous opening in the grill.

IB are both square in Where square members are used in building the grill a better approximation of the size of the members to the opening they frame is that wherein the cross corner measurements of the intersectirg members are limited to one-quarter of the maximum lineal dimension of a contiguous opening. This measurement is indicated by line :nof Figurefi.

The spacing of grills I within the cope in order to support the sand to the optimum extent varies with the size and shape of the pattern and flask, as Well as with the conditon of the sand. So long as sufficient space to accommodate the ramming tools is left between the grills they cannot be arranged too closely together. At the other ex,- treme, one grill is better than none. Consequently great latitude of choice exists as to the number and spacing of the grills l'.

The depth of sand in a cope is a function of the pattern shape, as well as the ask size. The larger theflask, the deeper must be the sand above the highest point on the pattern. Without adequate reinforcing the sand mustbe deep enough to form a vnatural arch. The grill makes possible the replacement of the cumbersome arch roof with a light reinforced slab. Much time, labor and material is saved by the lesser amount of sand that must be rammed.r

It is understood, of course, that this invention is not limited to any particular size or shape of the individual grill members, that is, whether or not they are deformed, similar, or unlike, except that such sizes and shapes bear the aforementioned relationships to the apertures they frame.

described the invention, what is ters Patent is:

The combination with a molders ask of a metallic grillcornposed of interwoven wire inembers with diameters not exceeding one-fourth the 10 maximum lineal dimension of a contiguous opening of the grill, said grill extending vertically of the ask and from side to opposite side of the cope portion of the flask and secured thereto, the interstices of said grill being open for the inflow of andfrom both sides of the grill.

WILLIA M MELLEN DUNCAN.

REFERENCES CITED The following references are of record in the 20 file of this patent:

UNITED sTAfrEsPATEN'rs Name,4 Date Meigsf- June 21, 18'10 Bawden July 3, 188s Rileyv June 26, 1888 Beckwithv Sept. 8, 1903 Kramer` Oct. 25, 1932 Welshans Nov. 3, 1942 Stein Nov. 21, 1944 Certificate of Correction Patent No. 2,460,218. January 25, 1949.

WILLIAM MILLEN DUNCAN It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

In the grant, line 1, and in the heading and signature to the printed specification, name of inventor, for William Mellen Duncan read William Millen Duncan;

and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in thePatent Ol'ce.

Signed and sealed this 16th day of August, A. D. 1949.

THOMAS F. MURPHY,

Assistant Uommissz'oner of Patents.

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