US728011A - Flask for molding and casting. - Google Patents

Description

No. 728,011. PATENTED MAY 12. 1903.

J. C. REED.

PLASK FOR MLDING AND CASTING.

APPLIQATION FILED MAR. ze, 1902.

No MODEL.

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nur STATES- Patented May 12, 190s. I

2 ATENT FFICE.

FLASK Fou MOL'DING AND CASTING.

SPECLTFICATION forming part of Letters Patent No. 728,011, dated May 12, 1903.

Application filed March 28, 1902. Serial No. IOOA7S. V(Nomodel.) Y l To @ZZ lwhom it matg/concerm Beit known that I, JOHN C. REED, a citizen of the United States, residing -at'Alleghen'y,v

in the county of Allegheny and State of Penusylvania, have invented certain new and useful Improvements in Flasks for Molding and Casting; and I do hereby declarethe following to be a full, clear, and exact description of the -invention, such as will enable others skilled in the art to which it apperfains to make and use the same. A

This invention has relation vto flasks for molding and casting,and particularly to ii'ask's` in it is proposed to employ two separate plat-f terns to form the mold-cavity for a single tub and to so gate the mold that the metal poured into boxes at the top of the ask will enter the cavity at its lowest point and rise therein without beingcaused to first fall down through the mold-cavity.

It may be here briefly stated that in pour-` ing the metal into the highest part of the mold or in admitting it at a point or points wheret-"lrs to flow downward through the mold-cavity to reach the lowest point the molten metal invariably pursues a shifting course, and as it deviates from side to side it leaves on one side or the other a thin film of metal in contact with the sand. This film as deposited instantly curves outwardly from the surface of the sand, carrying portions of the latter with it and producing porosity, roughness, and other imperfections in the casting, all of which I avoid by the molding processand apparatus described in my previous applications, in which it is proposed to adinit the metal to the mold-cavity at its lowest point through gates formed in the sand at the sides of the mold-cavity and to cause it to rise uniformly through the cavity to the highest point thereof.

In describing the apparatus for carrying into effect the process of lling the moldcavity throughgates formed in the sand outside the cavity and leading from the gateboxes to the lowest point of the cavity I have heretoforeA illustrated and described a flask the cheek and vcope parts of which are composed each of a large single-piece casting having a plain interior surface formed by unbroken walls and constituting a receptacle for the sand, which is packed around the pattern.y Such cheek and cope parts or sections ot the iiask are of large dimensions, so as t0 leave space enough between their walls and the pattern for the formation of the gates in the sand and are consequently very heavy andf cumbersome to handle and require a great deal more sandto fill them than is necessary for the formation'of a suitable mold.

The object of my present improvement is todecrease the size 'and weight of the fiask and adapt it for'the reception of a minimum quantity of sand without impairing its use fulness; and to this end my improvement consists in constructing the cheek and cope parts of thevflask much narrower than heretofore and in some cases much shorter and in forming interiorly-recessed offsets at suitable points for the reception of the sand in which the gates are to be made,-so that the gates leading to the bottom of the mold-cavity vor to communicating sprues will be entirely 'outside the main body of the sand. When, as heretofore, the gates have been formed in the body of the sand inside the plane of the interior surface of the flask, it has been necessary to run them at an angle or ohliquely. instead of vertically, owing to the shape of the flasks and the insufficiency of thickness of the'walls of packed sand, thus interfering with the perfectly free and unimpeded flow of the metal. With my improved structure, however, the gates, not being in the main body ot' sand, but outside it and through separate projecting portions, may berlin vertically and given such capacity as to admit of the perfectly free iiowing of metal, so desirable and generally necessary for the complete, easy, and uniform filling of the moldcavity.

In the accompanying drawings, Figure l is a side elevation of a ask embodying my invention; Fig. 2, a plan view of the cheek por tion, and Fig. 3 a transverse sectional view of the flask on the line a: m of Fig. l.

A designates the follow-board, upon which the pattern rests while the sand is being IOO packed around its outer surface. This base is fianged at D to receive and support the cheek part E of the flask7 which is correspondingly anged at D.

F designates the cope, and G G the gateboxes, forming part of the same.

For the purposes of my invention the cheek and cope sections are made of as small dimensions as may be required for the reception of sufficient sand to form the mold. The walls of the cheek are inclined inwardly from the bottom, so as to be approximately parallel with the walls of the pattern and further diminish the width and length of the flask and decrease the quantity of sand necessary to fill the flask when the pattern is in place.

To provide for the gates, the cheek part of the flask is formed with the hollow offsets 7L h, of which there are preferably four, two on each side. The inner recessed portions of tllese offsets open into the hollow portion of the flask, and in the bodies of sand rammed therein the gates 't' z' are formed, leading from the gate-boxes vertically to the horizontal passages or sprnes 7c 7c, which communicate with the mold-cavity at its lowest part-that is, at the part forming the rim of the tub. The quantity of sand thus packed into the offsets of the fiask is comparatively small, while the formation of the gates in the projecting sand columns does not impair the strength or compactness of the body of sand packed around and upon the pattern. As the mold is in itself smaller than those formed without the offsets and as the quantity of' sand required is greatly diminished, the weight and bulk of the filled fiasks are greatly decreased, renderingiteasier to handle and transferthem to different parts of the foundry and less liable to injury than flasks of other construction.

The cope preferably used consists of a single casting having cast integral therewith the gate-boxes, which extend out beyond the side walls d of Ithe cope and coincide at their eX- tended ends with the offsets h, formed on the cheek. These boxes are sufficiently high to give the metal the required hydrostatic rise in the mold-cavity to fill it.

The walls of the cope are contracted, so as to diminish thearea and capacity of the sandholding space of the cope, and thus greatly reduce the quantity of sand required to fill the cope. The cope is formed with the usual bars or partitions e, constituting supports for the sand.

Having described my invention, I claiml. A flask for molding and casting bathtnbs,comprising a cheek part having converging walls with laterallyprojecting offsets, adapted for the reception of the sand in which the gates are formed, a cope, and gate-boxes extending over the offsetsof the cheek part,the cheek and cope parts being packed with sand, to form a casting-space conforming to the exterior of a tub, and having gates extending from the gate-boxes, through the sand contained in the recesses of the cheek part, and communicating with the casting space or cavity through sp1-ues at the lowest part of said cavity, substantially as described.

2. A fiask for molding bath-tubs, comprising a cheek part having converging walls and laterallyprojecting offsets communicating with theinterior of the cheek part, and a cope, consisting of a convergent exterior wall of less width and length than the upper opening of the cheek part, and gate-boxes extending laterally above the offsets of the cheek part.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN C. REED.

Vitnesses:

W. L. CASE, J. C. LANGFITT.

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