US412566A - Island - Google Patents

Description

(No Model.)

H.. TALLMAN. MOLD FUR INGUTS- No. 412,566. Patented Oct. 8, 1889.

WITNESSES. INVENTEJR.

N. PETERS. Phdlo-Lllhnlnphsr, Wilhiullnn. D C.

UNITED STATES "PATENT OFFICE.

HENRY G. TALLMAN, OF CRANSTON, ASSIGN OR TO CHARLES F. IRONS, OF

PROVIDENCE, RHODE ISLAND.

MOLD FOR INGOTS.

SPECIFICATION forming part of Letters Patent No. 412,566, dated October 8, 1889.

Application filed May 31, 1889. Serial No. 312,798. (No model.)

To all whom it may concern..-

Be it known that I, HENRY O. TALLMAN, of the town of Granstom'in the county of Providence, in the State of Rhode Island, have invented a certain new and useful Improvement in 'Ingot-Molds; and I declare the following to be a specification thereof, reference being had to the accompanying drawings.

Like letters indicate like parts.

Figure 1 is a side elevation of my invention, with the mold shown partially in section on the line a; cc of Fig. 2. Fig. 2 is a top plan of said invention.

My invention relates to the metallic molds used in casting ingots, more especially of gold; and it consists of a solid mold having a central and tapering matrix, an indentation at its top on one side for the crucible to rest in, and a hub integral with said mold, in which hub a handle may be secured, as hereinafter specified.

In the drawings, A represents a solid mold made, preferably, of cast-iron, having a central and slightly-tapering matrix a. On the front top edge thereof is an indentation or recess 17, and on the opposite side is a hub a, cast integral with said mold; The hub a may be centrally bored and'screw-tl1readed, as indicated in dotted lines in Fig. 1, and a handle B, having a screw-threaded end, may be inserted in said hub, as shown. The check-nut (1 serves to prevent the handle from turning out of position.

Molds for casting gold and other ingots have hitherto been made as follows: Two pieces of steel, each having a central longitudinal channel planed therein. A series of holes is bored through these pieces on each side of the channel. The two pieces are then placed with their channeled faces together, and a series of rivets is passed through said holes from side to side, and they are headed by hammering in the usual manner. A plug is driven into the channel or opening thus formed and closes one end of the mold. The handle has usually been attached to the mold by a metallic loop, which, extending from the handle, passes around the mold on the outside and is secured thereto by a set=screw or otherwise.

Great inconvenience and much difficulty have been experienced in the use of ingotmolds thus constructed. The repeated heat ing of a mold so made causes the gradual expansion and consequent lengthening of the rivets by which the two pieces are held together, so that these two halves or pieces of the mold are not kept in perfect contact, but are slightly separated. The melted gold, when poured into the matrix, flows into the cracks or openings thus formed. When the gold cools and solidifies, the ingot cannot be easily taken out, because it is held by the slight ribs on two of its opposite sides, which have been thus formed within the cracks or openings between the two parts of the mold.

Besides this, the grooves or tool-marks left all along the surface of the matrix by the planing operation above mentioned when the channels are made still further tend to hold the ingot frictionally in the mold and prevent its easy removal. It is often, therefore, necessary in the use of a mold of this description to dislodge the ingot by turning the mold upside down and striking heavy blows with it, or sometimes to remove the plug at the bottom of the matrix and force the ingot out by poundinga rod or bar against the inner end of the ingot.

It is the purpose of my invention to avoid these difficulties. As my improved mold is made in one piece cast solid on all sides, with a central matrix formed by casting around a core instead of by riveting together channeled pieces, there are no partsto separate and no harmful expansion or contraction is possible.

In casting my mold I use a smooth steel core, so that the surfaces of the matrix are left smooth and are Wholly free from grooves, tool-marks, projections, or roughness of any kind. The result is that when the melted gold has cooled in the mold and has become solidified the ingot drops easily out of the mold without any hinderance when the mold is inverted, and repeated use does notimpair the usefulness of the mold in this respect. The indentation or notch b is useful to receive the corner or edge of the crucible and to prevent the sidewise displacement of the latter while the molten metal is poured theremuch cheaper in cost as Well as more durable and more easily used.

I claim as a useful and novel invention and desire to secure by Letters Patent 1. The combination of the mold A, having the matrix a, the hub c, the handle B, screwed into said hub, and the check-nut d, substantially as specified.

2. The improved ingot-mold A herein described, having the matrix a, the cruciblenotch 27, the hub c, the handle B, screwed into said hub, and the check-nut d, substantially as shown.

HENRY G. TALLMAN. Witnesses:

DANIEL W. FINK, WARREN R. PERCE.

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