US352475A - Adolphus john lustig - Google Patents

Description

( No Model.)

A. J. LUSTIG.

PROCESS OP MANUFACTURING GOMPOND 4METAL PLATES 0F @i Patented Nov'. 9, 1886.

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NITED STATES PATENT OFFICE.

ADOLPHUS JOHN LUSTIG, OF NEW YORK, N. Y., ASSIGNOR OF ONE-FIFTH TO LOUIS KAHN, OF SAME PLACE.

PROCESS OF MANUFACTURING COMPOUND METAL PLATES F PRECIOUS METALS.

SPECIPICA'JIONforming part of Letters Patent No. 352,475, dated November 9, 1886.

Application filed March 23, 1886. Serial No. 196,212.

To all whom it may concern.-

Be it known that I, ADoLPHUs J oHN LUs- TIG, of the city of New York, in the county and State of New York, have invented a new and Improved Process of Manufacturing Compound Metal Plates outv of Precious Metals, of which the following specification is a full, clear, and exact description.

This invention relates to an improved pro- Io cess of manufacturing compound metal plates out of precious metals.

The invention has reference more particularly to the processes in which one stratum of molten metal is cast against one stratum of solidhighly-heated metal; andit consistsin the elements of improvement hereinafter more fully pointed out. v Y

The accompanying drawings illustrate an apparatus for carrying my process into effect. In the drawings, Figure l is a perspective view of the mold. Fig. 2 is an upright section online :v x, Fig. l; Fig. 3, a horizontal section on line y y, Fig. l. Fig. 4 is a horizontal section of the furnace, with the mold therein shown in plan. Fig. 5 isa section through the product.

I propose to use the following-described method of uniting either two graded metals, one graded and one ungraded, such as gold and 3o silver, gold and composition, silver and copper, and, lastly, one stratum of gold, one of silver, and one of gold.

The plate a, of the higher grade of gold or silver that is to be compounded, is made of a 3 5 breadth somewhat smaller than the recess provided for it in the receiving-mold A, in order to allow room for expansion at its sides, as shown at c, Fig. 3. The plate a is made high enough to allow for expansion and the adjustment of a guard-bar, Z), on the top of the plate, so as to prevent any inflowing metal to flow upon the plate and cut it out. The plate a is straightened out so as to be perfectly true, and so as to rest on all its parts on a wroughtiron plate, d, that holds a stratum of asbestus, e, in place, the asbestus within the ingot-mold being for the purpose of throwing the heat of the inflowing metal upon the plate a to be compounded. After having made sure of the 5o perfect level of the plate, the same is rubbed (No modi-l.)

on its free side with sand-paper, for the purpose, first, of preparing a roughened holding-ground for theliquid metal, and, secondly,

of ridding the surface of the plate of all oxidized metal. Upon this roughened surface dried borax rubbed in water is put, and the whole subjected to a sufficient heat to melt the borax in such a way that the whole surface of the plate presents a glazed surface. Should there be any spots left where there is no borax, 6o the operation should be repeated.

Another Way to prepare the gold plate, which as a commercial plate contains copper, would be to subject the plate, after roughening with sand-paper, to sufficient heat to oxidize the copper contained on the surface, and then plunge the plate into diluted sulphuric acid, and repeat these operations until there is no copper in the surface. The traces of sulphate of copper are then neutralized with cya- 7C nide of potassium, and after a final rinsing with hot water pure olive-oil is poured upon this prepared surface and the same desiccated.

Instead of using animal oil for coating the mold, I may use pure graphite to cover the bottom and sides of the exposed part of the mold A, for the following purposes: to stop the pores of the cast-iron, to prevent friction, to .deo'xidize those parts of the metals poured into the mold that have become oxidized, and also to prevent radiation. The prepared plate a is then put into the mold in an upright position, Fig. 2, and the guard-bar bis put upon the top of the plate. The mold isput into a furnace, B, and heated to 1,5000 Fahrenheit. In the meantime the metal to be compounded with the plate is molten, and is then poured, preferably in two streams, into the mold, while the same is still in the furnace, against the exposed and prepared surface of plate a. 9o

It is well known that fourteen-karat gold melts at 1,925", while eightkarat melts at 1,6000, but must be brought to about 2,500O to pour well. A unionwill be effected when the gold plate is brought to 1,8000 Fahrenheit by the heat of the molten metal poured into the mold, and still sufficient heat left in the liquid metal to keep it perfectly liquid at least fifteen seconds, so as to be able to enter into the pores of the 'solid plate, out of which the air has been loo 2o on while the inoldbis in the furnace.

forced, either previously toputting :itinto the mold by melting the boi-ax on it-and leaving it on or by the heat of the furnace. It is evident that the quantity of the liquid metal in 5 relation to the plate a to be compounded and the bulk of the mold is of importance, because it is prudent to stop the active heat of the furnace previous to pouring, and consequently a large percentage of heat is lost ro through radiation, partly of the inilowing metal, as also through radiation at the sides of the mold, though this latter radiation is partly counteracted by the asbestus lining of the mold.

As it is of importance to prevent the descent of cold airinto the moldchamber, and thereby \coolthe plate and oXidize not only the falling metal, butalso the top ofthe metal within the mold, I provide a cover, f, which is to be put This coyer is to remain in place while pouring.

The furnace should be constructed in such a Way as to be able to heat the mold not only on the bottom and from the bottom, but the operbottom and increase the samein the middle of thetop of that part of the mold against which theplate rests.

"A furnace construct-ed for this purpose is shown in Fig. 4, Where B represents a section of the furnace, with openings B B to pass the metal to be cast into the mold A. These openings are provided with suitable doors to close the same when required, and the top of the furnace consists of a movable cover to lallow the mold to be inserted'or removed.

B2 B3 B4 are branches of gaspipes arranged at different heights to be able to direct the gasfianie to any part of the back 4,of the mold it may be found desirable.

I claim as 'niy invention- The process of producing compound metal plates, which consists in roughening one plate, oxidizing it, placing it in diluted sulphurc acid, pouring oil uponit, placing itinto a mold, and pouring liquid metal upon and alongside of it while the mold :is heated, substantially as speci tied.

ADOLPHUS Witnesses:

Louis KAHN, Mosns KAHN.

JOHN LUSTIG.

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