DE379263C - Covering the edges of aluminum-plated sheet iron coin plates with the cover metal - Google Patents

Description

GERMAN EMPIRE

ISSUED AUGUST 20, 1923

REICH PATENT OFFICE

PATENT LETTERING

- JVr 379263 - CLASS 49 i GROUP 5

(L 52454 l \ 4gi)

Max Loß in Reichenbrand b. Chemnitz.

Coating the edges of aluminum-plated sheet iron coin plates

with the cover metal.

Patented in the German Empire on February 24, 1921.

The aim of the present invention is to eliminate this when using aluminum-clad f

Iron sheet for making coins ^: Invention.

the evil was inevitable up to now, The basis of the procedure is the

that supply to the Münzrande the iron core \ note that the strength of the iron

days and is exposed to rusting. \ welded aluminum layer it

possible to bring the aluminum layer over the edge of the coin plate by means of a corresponding pressing and upsetting process. The invention consists in that one after the other j on both sides of the wafer by pressing the edge ■ pointed outward inlet; is continuously stretched out, so that the cover layers unite at the outermost pointed edge, whereupon the pointed edge is again compressed ίο cylindrically. In the drawing, the individual stages of the process are shown on an enlarged scale.

The coin plate p (Fig. Ι) punched out of the aluminum -plated iron sheet with the iron core b and the aluminum overlay α, α on both sides is tapered outwards on a press using the stamps 0, u (Fig. 2) on the upper edge stretched out. | For this purpose, the coin plate is immovable in the template i / at half of its sheet thickness. placed, while the upper punch 0 has a corresponding recess for the upper edge to be stretched outwards. Through the pressure of the press, the upper punch 0 compresses the plate and presses the metal into the upper edge recess, whereby the aluminum layer also stretches accordingly and the edge remains covered with aluminum at this point. In order to also get the aluminum layer on the lower edge, the above-described procedure is repeated (AbI). 3), with the only difference that the | Die u must be turned out according to the extended 1 upper edge in order to secure an immovable position of the plate for the j second pressing. The effect of the] pressure of the upper punch 0 is then the same as before, so that the lower edge is also pressed into the recess of the upper punch 0 and thus the aluminum layer unites at the pointed edge. The iron core h of the coin plate p is then surrounded on all sides by the aluminum layer α .

Now around the pointed edge of the coin

to eliminate again and the necessary cylindrical shape of the 'coin plate for

5u to restore the later coinage the plate is made cylindrical again on the well-known coin edge upsetting machines.

The coin edge upsetting machine consists of a steel disk r rotatable about an axis (Fig. 4), which is provided with a groove «the thickness of the coin plate or the edge to be upset, in which the coin plate is pressed against the edging hook k by turning the slider , whereby the edge, depending on the setting of the upsetting jaw, compresses accordingly.

The edge of the coin plate, which is pointed outwards, is pressed together, and thus the coin plate gets its original cylindrical shape again, only with the difference that now the aluminum layer covers the edge and the iron core is now made of aluminum on all sides is included. This plate can now be used on the well-known minting presses receive the embossing.

The larger coins are often strengthened a little bit at the edge when upsetting to cause the platelets to rest only on the edge and thus to protect the embossing. This reinforcement also happens by upsetting the edge of the coin on the edge upsetting machine. When these coin plates are minted, the reinforced Edge then compressed a little again, whereby the aluminum overlay is at the edge somewhat compacted and thus made completely durable.

The pending procedure can also be applied to all 8g coated with other metals new iron plates, provided the plating has the necessary strength.

Claims (1)

Patent claim: Process for coating the edges of aluminum-plated sheet iron coin plates with the cover metal, characterized in that the edge is stretched out one after the other on both sides of the plate (b) by pressing so that the cover layers (a, o) are at the tip of the Unite the edge, whereupon the pointed edge is compressed again in an Indian fashion. ioo 1 sheet of drawings.