TH6576A - The process for producing bimetallic coins and medals. - Google Patents

Abstract

This invention concerns a process for producing bimetallic coins or medals by joining a ring-shaped rim to a flange. The flange, which consists of discontinuous grooves on its outer edge, is placed within the ring-shaped rim. Crimping of the ring-shaped rim onto the flange results in a single operation, using a stamping die that activates the insertion of the ring-shaped rim into the discontinuous grooves on its outer edge, and then stamps the finished piece—for example, creating the coin's surface.

Claims (12)

1. The process for producing bimetallic coins or medals involves using a ring consisting of an inner opening and an insert of the appropriate size to fit into that opening. One ring and the insert form a connector. The insert is positioned in the ring's outer opening and is crimped, at least partially, by the connector, by inducing plastic deformation of part of the ring's insert material in the space between them. Finally, the coin is formed by stamping. A distinctive feature is the use of a rectangular ring with an initial thickness thicker than the insert. The crimping of the insert and the coin forming process occur in a single operation using a die that induces the plastic deformation of the ring material into the insert, and the stamping of the insert to create the coin's surface. 2. The process under claim 1 is characterized by the initial thickness of the ring used being 0.05 to 0.3 millimeters greater than the initial thickness of the inserted portion. 3. The process under claim 1 or 2 is characterized by the connection consisting of a continuous groove created on the perimeter of the inserted part. 4. The process under claim 3 is characterized by the fact that the connection consists of a series of discontinuous grooves created on the perimeter of the inserted part. 5. The process under claim 3 or 4 is characterized by the creation of discontinuous grooves during the process, forming grooves along the axis of the inserted part. 6. The processes described in claims 1 through 5 are characterized by the option of a gap between the inserted part and the ring between 0.5 and 2 tenths of a millimeter. 7. A coin or medal consists of a ring with an internal opening and an insert positioned within that opening. The insert is connected to the opening via a distinctive connector. The ring has an initial rectangular cross-section and is thicker than the initial thickness of the insert. The connection is achieved by the plastic deformation of the ring material into the insert. 8. The coin or medal under claim 7 is of a special nature in that the connection consists of discontinuous grooves created on the outer perimeter of the insert, which are filled with a plastically deformed ring material into the insert during the connection of the ring-insert assembly. 9. Coins or medals under claims 7 or 8 are characterized by the initial thickness of the ring being 0.05 to 3/10ths of a millimeter greater than the thickness of the flan (metal piece used to stamp the medal). 10. Coins or medals under claims 7 through 9 shall have the special characteristic that the initial space between the ring and the insert shall be between 0.05 and 0.2 millimeters. 11. Coins or medals under claims 7 through 10 have a special characteristic in that the inserted portion consists of 6 to 8 grooves on its outer perimeter, each groove having a maximum appropriate depth of approximately 0.2 millimeters. 12. Rings and inserts used in the production of coins or bimetallic coins shall have a special characteristic in that the ring shall have an initial cross-section of a rectangle and a thickness greater than the initial thickness of the insert, which is appropriately greater than 0.05 to 0.3 millimeters. (12 claims, 3 pages, 3 images)