US2467246A - Grid casting mold - Google Patents

Description

April 12, 1949. H. c. WINKEL GRID CASTING MOLD Filed Deb,

i J V m/I11 Patenteci Apr. 12, 1949 UNITED STATES PATENT OFFICE GRID CASTING MOLD Herbert C. Winkel, Maywood, Ill.

Application December 26, 1944, Serial No. 569,715

4 Claims. 1

My invention relates to grid casting molds.

This application is a continuation-impart of my co-pending application Serial No. 432,993, filed March 2, 1942, which has become Patent No. 2,365,740 which is a division of my co-pending application Serial No. 354,495, filed August 28, 1940, which has become Patent N 0. 2,278,815.

One of the objects of my invention is to provide a grid casting mold of the type having two mold sections having provisions for preventing the formation of a fin at the parting line at certain parts of the periphery of the grid, such as the edges of the grid locating lugs.

Further objects and advantages of the invention will be apparent from the description and claims.

In the drawings, in which my invention is illustrated,

Figure l is a plan or face view of a mold section which cooperates with a similar mold section for forming the grid;

Fig. 2 is a section on the line 22 of Fig. 1 on an enlarged scale;

Fig. 3 is a section of Fig. 1 on an enlarged scale;

Fig. 4 is a section on the line l4 of Fig. 1;

Fig. 5 is a perspective view of the springpressed plug shown in Fig. 4; and

Fig. 6 is a sectional view on the line 6-6 of Fig. 1.

Referring to the drawings in detail, the construction shown comprises a mold section or plate I, the left-hand end of which is shown in Fig. 1, having a grid forming recess 2 therein cooperating with a similar grid forming recess 3 in the other mold section 4 to complete the grid forming recess 2. The two mold sections 1 and 4 are provided with complemental filling opening recesses 5 into which the molten metal is poured, which flows into the grid-forming cavity. The mating sections l and 4 are formed with cooperating grid-like recesses 6 and I for forming the strands of the grid and with cooperating recesses 8 and 9 forming compression chambers to assist in insuring that the mold cavities are completely filled with molten metal, as described in detail in the above parent application Serial No. 354,495, which has become Patent No. 2,278,315.

The mold is also shown provided with a number of projecting recesses 90 and H for forming grid lug cavities. For certain purposes, it is extremely desirable to have the periphery of these grid lugs, or at least certain portions thereof, definitely defined. The periphery of these grid lugs may, for example, be used in positioning the grid definitely in trimming the flash or fin from the periphery of the grid. In molding the grids, a fin or flash of greater or lesser extent will be formed along the periphery of the grid. In order to eliminate this fin on the periphery of the lugs, spring-pressed plugs l2 and I3 are provided, slidably mounted in recesses in one of the mold sections I and spring-pressed against the adjacent parting surface of the other mold section 4. In Figs. 4 and 5 are shown one of these springpressed plugs [2 in which a portion M of the grid lug forming cavity is formed in the face of the plug. In this form of plug, it is necessary that the cylindrical plug should not be free to rotate in the cylindrical recess in which it is mounted. To prevent any rotation, the plug I2 has secured to its inner face a pair of guide pins l5 which are guided in guide openings in the mold section I. In order to press the plug toward the other mold section, a coil compression spring "5 is provided surrounding a stop pin ll secured to the plug, the spring bearing against the inner surface of the plug l2 at one end and against a shoulder [8 formed in the mold section I. The stop pin is provided with a head It to prevent the plug from being forced out of the recess in the mold section when the mold sections are separated.

In Fig. 6 is shown a fin-preventing springpressed plug construction similar to that just described which is not provided with a complemental recess I4 for cooperation with the lu forming recess II in the mold section. In this form, the portion of the grid lug in engagement with the face 20 of the spring-pressed plug l3 will have a thickness equal only to the depth of the lug-forming recess II in the mold section. In this form there is no need for the rotation preventing guide pins as it is immaterial whether or not the plug slips rotarily in the cylindrical recess.

Further modifications will be apparent to those skilled in the art and it is desired, therefore, that the invention be limited only by the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A grid casting apparatus comprising two cooperating mold sections having complemental grid-forming recesses and parting surfaces engageable with each other and bounding said recesses, one of said mold sections having a flashpreventing plug mounted thereon having an end face portion having spring-pressed sealing engagement with the bounding parting surface of the other section to prevent flash formation between the plug and parting surface and a second end face portion spaced from the opposing surfaces of said other section to enable molten metal to enter between said opposing surface and the second end face portion, said plug having a slide portion of uniform cross section slidably fitted in the mold section adjacent the periphery of the grid forming recess.

2. A grid casting apparatus comprising two co operating mold sections having complemental grid-formingand lug-forming recesses and parting surfaces engageable with each other and bounding said recesses, one of said mold sections having a flash-preventing plug mounted thereon having an end face portion having spring-pressed sealing engagement with the bounding parting surface of the other section to prevent flash formation between the plug and parting surface, said plug having a slide portion of uniform cross section slidably fitted in the mold section adjacent the periphery of the grid forming recess, said 'tl'ri section having a lug bounding recess exoutwardly from the grid forming recess ng a surface opposite an end face portion of plug and spaced therefrom to enable molten Renter between said end face portion and face.

Agrid casting apparatus comprising two coat g mold sections having complemental H rfa'ces engageable with each other and said recesses, one of said mold sections h ving flash-preventing plug mounted thereon end face portion having spring-pressed "agement with the bounding parting pf the other section'to prevent flash forbe een the plug and parting surface, said ga slide portion of uniform cross sec- 1y fitted in the mold section adjacent hery of the grid formin recess, said having a lug bounding recess exing and lug-forming recesses and partv tending outwardly from the grid forming recess opposite an end face portion of the plug, said plug having a lug bounding recess in the end face opposite said first lug bounding recess.

4. A grid casting apparatus comprising two cooperating mold sections having complemental grid-forming and lug-forming recesses and parting surfaces engageable with each other and bounding said recesses, one of said mold sections having a flashpreventing plug mounted thereon having an end face portion having spring-pressed sealing engagement with the bounding parting surface of the other section to prevent flash formation between the plug and parting surface, said plug havin a slide portion of uniform cross section slidably fitted in the mold section adjacent the periphery of the grid forming recess, said other section having a lug bounding recess eX- tending outwardly from the grid forming recess opposite an end face portion of the plug, said plug having a lug bounding recess in the end face opposite said first lug bounding recess, said mold section and plug having means for preventing rotation of said plug in said section.

HERBERT C. WINKEL.

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

UNITED STATES PATENTS Number Name Date 2,134,829 McWane Nov. 1, 1933 2,161,522 McWane June 6, 1939 2,194,092 Lund Mar. 19, 1940 FOREIGN PATENTS Number Country Date 353,497 Great Britain July 22, 19 31 146,721 Germany Dec. 15, 1903

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