FI101360B - Two-part topic for coins, medals, chips, game chips and the like - Google Patents

Abstract

The invention relates to a bimetallic blank for coins, medallions, tokens, gaming chips and the like, consisting of an inner disc (1) of a first metal or of a metal alloy which is pressed into the central aperture of an outer ring (2) of a second metal or of a second metal alloy, the disc (1) being provided with obliquely extending indentations (5) on its outer edge (4). <IMAGE>

Description

, 101360

Two-piece blank for coins, medals, tokens, chips and the like

The invention relates to a two-part blank for coins, medals, tokens, chips and the like, consisting of an inner disc of a first metal or an alloy pressed into the central opening of an outer ring of a second metal or an alloy. More specifically, the invention relates to a two-part blank for coins, medals, tokens, chips and the like according to the preambles of claims 1 and 2.

In the past, coins have been made mainly of a single piece of solid metal of uniform composition. In addition, coins were made of various metals and alloys. In this case, it is mainly a question of layer composite working materials, such as those produced, for example, by layer coating with a brass coating on both sides of the steel core. In the recent past, combinations of working materials consisting of a disc of one metal surrounded by an outer ring of another metal or another alloy also became increasingly available for the production of coins. Thus, an East 20 Lira 500 lira coin is formed from an inner disc made of a gold-colored copper alloy. Concentrated around this inner disc is a squeeze; *! outer ring in bluish radiant silver-gray chrome steel.

Today's high-speed coin-operated machines, which produce these combinations of consumables at a tolerable cost, even in large quantities of 25 pieces, require special attention in the manufacture of components of such a concentric combination of consumables. The special measures are: T: thus necessary in order to obtain a good adhesive connection between the inner disc and the outer ring when minting.

U.S. Patent No. 3,499,739 proposes that the outer ring 30 be selected to be somewhat thicker than the inner disc. Therefore, the outer ring is pressed over the edges of the inner ring to obtain: V a disc-shaped joint between the disc and the ring. In JP 58-3 743, the proposal includes the provision of an inner disc or, alternatively, an outer ring. with a circumferential groove. For interconnection, the two components are nested with a special tool to press the material of the inner disc into the groove in the outer ring or vice versa.

It is known from EP-A-0 0 0 43 437 to form the inner edge of the outer ring wedge-shaped and to provide the inner disc with an edge flange. In a coinage operation, the substance can then flow from this bead over the tapered inner edge of the outer ring. At the same time, a plurality of protruding teeth are further formed on the inner edge of the outer ring, which are pressed into the inner disc when minting money. This eliminates the possibility of the outer ring and the inner disc rotating relative to each other.

EP-A-0 160 343 deals with this idea in a very similarly formed outer ring. In connection with the coin known from EP-A-0 280 615 10, a ball is introduced into the outer ring and is then plastically molded into an inner disc. EP-A-0 415 892 provides an inner circumferential edge of the outer ring with a continuous circumferential groove into which the material of the inner disc then flows during the minting operation.

While the method of U.S. Pat. No. 3,499,739 has proved to be insufficient for practical use and the method of the above-mentioned JP publication requires a special tool for interconnection, complex geometric shape.

It has now surprisingly been shown that a simple suitable shaping of the outer edges 20 of the inner disc will certainly prevent both parts from twisting and the inner disc from falling off the outer ring after minting. For this, it is sufficient to provide the outer edge of the inner disc with recesses in a diagonally oriented arrangement. These recesses can be formed as a helical groove. In this way, the flow of the substance of the outer part into the recesses of the inner part is facilitated. More specifically, the two-part blank according to the invention is characterized by what is stated in the characterizing parts of independent claims 1 and 2. Preferred embodiments of the two-part blank according to the invention are non- ·. ·. subject to independent claims 3 and 4.

According to an embodiment of the invention, it is made in such a way that the outer ring and the inner disc of the concentric coin-operated combination differ considerably in their electrical conductivity. This is best achieved by using a copper-coin working material with an electrical resistance of up to 25 μ Ω · cm as the electrically highly conductive part. Chromium or chromium-nickel steel with a specific electrical resistance of at least 70 μ Ω · cm is selected as the poorly conductive part 35. The less electrically conductive 3 101360 part may also be a layer structure of ferritic or austenitic steel. In this way, the following is achieved:

Modern electronic coin testing devices utilize the principle of electromagnetic interaction between electromagnetic fields and coin metals with different frequencies in different ways. Characteristic dual signals are achievable as the coins pass through the coil systems of the coin probes, insofar as the much better conductive portion of the working material combination forms the outer ring, or alternatively a single signal having a characteristic curved shape when the much better conductive portion forms the inner disc.

The invention will now be described with reference to the drawing.

According to Fig. 1, the coin consists of an outer ring 2 with a central opening, the outline of which is the inner disc of Figs. 2 or 3, respectively, by pressing the inner disc 1 into the central opening of the outer ring in a force-fitting manner.

In order to improve the adhesion of both parts 1, 2 according to the invention, several oblique recesses 5 are arranged in the outer edge 4 of the inner disc 1 (Fig. 2). In the embodiment according to Figure 3, the recesses are connected in a helical groove 5a extending around the outer edge 4 of the inner disc 1. Substance flows into these recesses 5, 5a when the parts 1, 2 are crossed together. This effect results not only in a force-closed but also in a form-closed connection of the parts 1,2.

As a result of the oblique position of the recesses 5, 5a according to the invention, the inflow of material is considerably facilitated during the compression of the two parts 1, 2, since the recesses 5, 5a are gradually filled with the material of the second part without recesses.

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Claims (5)

A bifurcated blank for coins, medals, host chips, chips and the like, consisting of an inner sheet of a first metal or metal alloy, which sheet is formed with recesses at its outer edge and pressed into the central opening of an outer ring of a second metal or metal alloy, characterized by the recesses (5) at the outer edge of the inner disc (1) extending obliquely directed relative to each other. 2. Bifurcated blank for coins, medals, host chips, chips and the like, consisting of an inner sheet of a first metal or metal alloy, which sheet is formed with recesses at its outer edge and pressed into the central opening of an outer ring of a second metal or metal alloy, characterized in that a winding or path-shaped latch (5a) extends around the outer edge (4) of the inner disk (1). 15 3. A material according to claim 1 or 2, characterized in that the materials in the inner disc (1) and the outer ring (2) differ in specific electrical resistance with at least 45 μ Ω * cm. Blank according to claim 3, characterized in that the electrically inferior conductive part consists of chromium or chromium-nickel frame or a laminate of an austenitic and a ferritic stainless steel. • · · • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·