US1193104A - Device for sand molds - Google Patents

Description

C. 0. WOOD.

'DEVICE FOR SAND MOLDS.

' APPLICATION FILED APR. I, 1914.

Patented Aug. 1, 1916.

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DEVICE FOR SAND IVIOLDS.

Specification of Letters Patent.

Patented Aug. 1, 1916..

Application filed April 1, 1914. Serial'No. 828,771.

T 0 all whom it may concern v Be it known that I, CHARLES O. WOOD, a citlzen of the United States, residing at and State of Pennsylvania, have invented certain new and useful Improvements in Devices for Sand Molds; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to a device for sand molds, that is to say, either an automatically adjustable jacket, or a jacket of the non-automatically adjustable type, or a flask. I have discovered that when the inner contacting surfaces of such a jacket are suitably roughened in any convenient manner, the jacket will cause the sand mold to accommodate itself thereto, so as to make a close fit between them.

It is well known that, in practice, the jackets can not be made to exactly fit the molds for which they are intended, and in order to compensate for the slight variations in taper and size, between the jacket and the flask in which the mold has been made, heretofore these jackets have been made adjustable.

I have discovered that when the moldcontacting surfac e s of the acket are roughened in any manner, the jacket, as it is slipped onto the mold, will displace the sand on the surface of the mold, so that said sand will accommodate itself to the slight inaccuracies in the dimensions between jacket and flask, so as to make a tight fit;

or some of the surface sand of the mold vary the dimensions of a jacket to meet cer-' tain foundry conditions, and also to meet the end of an adjacent side.

manufacturing conditions, whereby various dimensions of ackets can be readily assembled from different sizes of jacket sides. Chambersburg, in the county of Franklin Referring to said drawings, in which like parts are similarly designatedFigure l is a perspective view of a jacket embodying my invention. Fig.2 is a detail perspective view, illustrating the use of a filler member. Fig. 3 is a fragmentary view showing another roughening for the jacket face. Fig. 4: is a plan view showing a modified form of jacket. Figs. 5 and 6 are plan views showing diiferent forms of grooves. Fig. 7 is a partial sectional View of another form of jacket or flask having horizontal steps so arranged that the molding device may be drawn out. Fig. 8 is a like view of a horizontally grooved flask side for forming a ribbed surface on the sand mold.

In Fig. 1 I have shown a jacket consisting of long sides 1 and sides 2 shorter than the sides 1. Each side has a flange 3 at one end in which are bolts 4, and the other end is provided with slots 5 arranged for the reception of the bolts 4 in theflange 3 in Nuts 6 hold the jacket sides together at the corners.

The bolt and slot connection at the corners of the flask inwhich the sand mold is made.

The inner faces of the sides 1 and 2 are roughened, in this instance by serrations or corrugations 9 extending from the upper to the lower edge of the jacket face. The serrations or grooves in the sides may be of any shape, and instead of forming V-shaped grooves across the jacket face as in Figs. 1 and 2, they may form rectangular grooves 10, Fig. 5, or curved grooves 11, Fig. 6, producing an undulating surface. These grooves extend across the side of the jacket from the upper toward the lower edge thereof, and are preferably, but not necessarily, perpendicular to these edges.

The cope and drag members of a flask may be constructed in the same manner as the jacket illustrated in the drawings. hen using such a jacket the serrations enter the sides of the sand mold when the jacket has nearly reached the limit of its downward movement when applying it. The sand is displaced on the surface of the mold, without injuring the cavity in the mold, so that it will enter between the serrations,-and it may be, if the discrepancy in shape between the flask and jacket be marked, that the serrations will remove some of the sand from the surface of the mold. The result is that such a jacket will fit its mold snugly and properly support the sand while the metal is being poured into the mold cavity.

From jacket sides such as illustrated in Fig. 1 three different sizes of jackets may be made, one by using two short sides 2 and two long sides 1; as illustrated; another by using four short sides 2, and the third by using four long sides 1. This greatly facilitates manufacturing conditions, as but one set of patterns are required for the three different sizes of jackets, and these same sizes may be combined with longer or shorter sides, so that the number of patterns required for a given set of jackets is very materially decreased. 7 7

As previously stated, the roughness on the faces of the jacketsides may be formed in any suitable manner, and in Fig. 3 I have illustrated a portion of a side provided with points 7. Any other suitable configuration 'may be given to the projections forming the roughness on the face of the jacket side.

In Fig. 2 I have illustrated a filler 8 inserted between the ends of the adjacent jacket sides 1 and 2 at a corner of the jacket.

Such fillers 8 may be of various thicknesses,

of sheet or cast iron, wood, or other suitable material, or may be cast in place and formed of soft metal, as Babbitt metal.

In Fig. 4, I have shown a modification in which the flanges 3 are not at right angles to their sides but are inclined thereto at about 45.

Fig. 7 illustrates a tapered jacket or a tapered flask whose face has longitudinal steps 12 so arranged that the mold device may be drawn from the sand mold. If the flask have such steps on its inner face, then the sides of the sand mold, when the flask has been withdrawn, will be stepped, so that a smooth-faced jacket can be used With such stepped mold. If the face of the sand mold be smooth as when made in a smooth-faced flask, then, in order to get a proper fit and seating of the jacket to support the sand during the pouring of the metal, the jacket face will be roughened by forming such steps 12 thereon.

In Fig. 8 I have shown a flask side 2 having longitudinal grooves 13 on its face or sand-contacting surface, the dimensions of which grooves are such as to produce the same effect as the roughened faces heretofore described. Such a flask cannot be withdrawn from the mold, but must be opened,

2'. e. will be of the .type known as snapflasks.

I am aware that snap flasks have heretofore been made with longitudinal grooves in their sand containing faces, but these grooves were dimensioned, intended and used for a different purpose, namely, in place of sand strips. In applying a smooth-faced jacket to the mold made in such a known snap-flask, sand ribs left by such a mold are shaved off, and not re-distrihuted between the face of the mold and jacket. This is probably due to the fact that the body of sand contained in such ribs is too great for proper distribution between the face of the sand mold and jacket. The result is that when applying the jacket, either the mold cavity will be destroyed when too near the side of the mold by the large body of sand of such a sand rib being forced inward, or the rib will shave ofl or break down before the jacket gets close to the mold face, and when it does so, the relation of the ribs to their interspaces is such that there will not be suflicient sand to fill up the interspaces and compensate for the discrepancies between the dimensions of the mold and the jacket. At any rate, practical trials prove that such molds cannot be used with jackets with the degree of certainty that would warrant their commercial use. On the other hand, I have discovered that by forming the ribs much smaller and so dimensioning them that when a smooth-faced flask is applied the small ribs will distribute themselves properly within the interspaces, they will also compensate for the irregularities for which this invention is intended. Furthermore, substantially no sand will be shaved off but practically all of the sand of these ribs will be redistributed, to enable the jacket to give the mold that proper and necessary support for the casting operation.

I claim 1. Ina sand mold device, a side made in asingle piece and having serrations formed therein only on its sand mold contacting face integral with said side and arranged to permit the drawing of said device from the sand.

2. A sand mold device Whose sides have their sand mold contacting faces provided with integral, longitudinal ribs arranged step-wise.

3. A sand mold device, one or more of whose sides has serrations only on the sand mold contactingside, said serrations being integral with the side, the sides having adjusting means torigidly connect them together, said adjusting means permitting the adjustment of one side with respect to the other.

4:. A sand mold device having metal sides whose inner sand mold contacting faces are roughened longitudinally of the faces and arranged to permit the device to be drawn from a sand mold Without destroying the impressions made by said roughened faces.

5. In a sand mold device having a side having its sand mold contacting face provided with a series of substantially longitudinal ribs arranged step-wise.

G. A sand mold device having inclined sides, each side of which has a flange at one end provided with bolts, and slots at the other end, the slots in the end of one side registering with the bolts of an adjacent side, and a filler between the flanged and slotted ends.

7. A sand mold device having inclined roughened sides, a flange at one end of each side having a bolt therein, the other end of each side having a slot arranged to register with the bolt of an adjacent side, and a filler between the ends so connected.

8. A tapered sand mold device having permanently connected inclined solid sides provided with roughened sand mold contacting faces integral with said sides and arranged to permit the device to be drawn or lifted from the mold without changing the configuration of the surface imparted to the mold by said roughened faces.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

CHARLES O. WOOD.

Witnesses:

CHAS. J. ZULLINGER, CLAY L. HENNINGER.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O.

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