JP2609503B2 - Money material - 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

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a currency, a medal, a substitute currency, and a speculative machine in which an inner disk of a first metal or a first alloy is pressed into a center hole of an outer ring of a second metal or a second alloy. The present invention relates to a two-part currency material for chips and the like.

[0002]

2. Description of the Related Art Heretofore, money has mainly been produced as a single solid piece of metal having a uniform composition. Currency may be manufactured by changing the type of metal or metal alloy, but these are mainly laminated materials, and the manufacturing method is, for example, a method of pressing a steel core material on both sides with a brass layer. More recently, the production of coins using laminated materials comprising a metal inner disk surrounded by a ring of another metal or other alloy has also increased. For example, the 500 lira coin of Italy consists of a gold copper alloy inner disk, around which a blue-gray silver-gray chrome steel outer rim is pressed concentrically. Particular care must be taken to produce a large number of parts of concentrically laminated members at a reasonable cost with a coining machine accelerated with current technology. Thus, a special step is required to achieve sufficient adhesive bonding during coining between the inner and outer disks.

[0003] US Pat. No. 3,499,739 suggests that the outer ring should be slightly thicker than the inner ring. The intention is to press the outer rim against the edge of the inner disk during the coining operation to achieve a positive connection between the disk and the ring. JP-A-58-3743 suggests forming an annular groove on the inner disk or outer ring. During assembly, the two parts are placed on one another and then the inner material is pressed into the grooves of the outer ring or special tools are used.

[0004] EP-A-0 080 437 discloses a structure in which an inner edge of an outer ring is wedge-shaped and an edge bead is formed on an inner disk. Thus, during the coining operation, material flows from the bead into the tapered inner edge of the outer ring. At the same time, a number of projecting teeth are formed on the inside of the outer ring and pressed into the inner ring during coining. As a result, after coining, the outer ring and the inner disk cannot rotate with respect to each other.

[0005] EP-A-0 160 343 takes this idea and uses a very similar outer rim. E
In the case of the currency known from PA-0 280 615, the ball is introduced into the outer ring and then the ball is plastically reshaped to form the inner disk. EP-A-0
In the case of 415 892, a circumferential groove is formed on the inner edge of the outer ring so that the material of the inner disk flows during the coining operation.

[0006]

SUMMARY OF THE INVENTION US-A-3 499
The teaching of 739 was found to be inappropriate for practical use,
Also, JP-A requires special tools for assembly,
The teachings of EP-A 0 080 437, 0 160 343 and 0 415 892 have the disadvantage that the inside of the outer ring needs to have a complex geometry.

[0007]

SUMMARY OF THE INVENTION By making the shape of the outer edge of the inner ring a suitable shape that can be easily implemented,
It has surprisingly been found that the two parts can be reliably prevented from rotating or the inner ring from falling out of the outer disk. For this purpose,
It is sufficient to form recesses in the outer edge of the inner disk that are obliquely oriented with respect to each other. The depressions can also have a serpentine groove shape. This prevents the material in the outer part from flowing into the recesses in the inner part.

According to another aspect of the invention, the outer ring and inner disk of the concentric composite material forming the currency have significantly different electrical conductivities. This means that the maximum specific electrical resistance is 25 μΩ. This is best achieved by using a copper currency material of cm in areas of good electrical conductivity. Specific electric resistance is at least 70 μΩ. Chromium steel or chromium magnetic steel having a low electrical conductivity is preferably selected as a material having poor electric conductivity.
The portion having poor electrical conductivity may be a laminate of layers of ferritic steel and austenitic steel. As a result, the following items are achieved.

[0009]

The present electronic money tester utilizes the interaction of electromagnetic fields of different frequencies with various metals of the money. As the currency passes through the coil system of the currency testing device, the currency emits a duplicate characteristic signal if the outer ring of the laminate material is a portion of good conductivity, or the portion of good conductivity is the inner disk. , A single characteristic curve is emitted. Hereinafter, the present invention will be described with reference to the drawings.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Currency is an outer ring 2 having a central hole (FIG. 1).
, And the contour of the center hole corresponds to the contour of the inner disk 1 (FIGS. 2, 3). The inner ring 1 is non-positively connected to the outer ring 2 by press fitting into the center hole of the outer ring 2.

In order to improve the adhesion of the two parts 1, 2 according to the invention, a number of oblique depressions 5 are formed in the outer edge 4 of the inner disk 1 (FIG. 2). In the embodiment shown in FIG. 3, the depressions are joined to form a curved groove 5a extending around the outer edge 4 of the inner disk 1. The compression of the two parts 1, 2 causes the material to flow into the depressions 5, 5a, creating a positive connection of these parts 1, 2 in addition to the non-positive connection.

[0012]

The flow of material during compression of the two parts 1, 2 is clearly facilitated by the fact that the depressions 5, 5a according to the invention are positioned obliquely. This is because the depressions 5, 5a gradually become filled with other parts of the material without depressions.

[Brief description of the drawings]

FIG. 1 is a perspective view of an outer ring of money.

FIG. 2 is a perspective view showing one structure of an inner disk.

FIG. 3 shows an embodiment showing a variant of FIG. 2;

[Description of Signs] 1 inner disk 2 outer ring 4 outer edge 5 hollow

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Angelica Kolp-Teleps, Germany, d-5880 Rue Denscheid am Billichro, Germany 24 (72) Inventor Ulrich Wybner, Germany, d-5980 Verdor, Borgherastrasse 28 (56) References JP-A-58-3743 (JP, A)

Claims (4)

(57) [Claims] An internal disk of a first metal or a first alloy is pressed into a center hole of an outer ring of a second metal or a second alloy. A money material comprising two parts, wherein a recess (5) is formed in an outer edge (4) of a disk (1), and the extending direction thereof is oblique to each other. 2. A two-part money stock according to claim 1, wherein the diagonally extending depression is a meandering groove (5a) extending around the outer edge of the inner disk (1). 3. Material of inner disk (1) and outer disk (2)
Has a specific electrical resistance of at least 45 μΩ. A money material comprising two parts according to claim 1 or 2, wherein the money material is different from each other. 4. The two parts according to claim 3, wherein the part having a low specific electrical resistance is made of chromium steel, chromium / nickel steel, or a laminate of austenitic steel and rust-resistant ferritic steel. Money material consisting of.