Patent ID: 6044541
Filing Date: 2000-04-04
Classification: A44C,B44B,Y10T

Abstract:
A method of making a bimetallic coin, token, or medal, comprising the steps of:(a) providing an outer member from a first metal alloy, said outer member including:(i) generally parallel, opposed face sections spaced apart a predetermined distance corresponding to the initial thickness of said outer member;(ii) an inner plain edge devoid of teeth and grooves, the edge defining an opening in said outer member; and(iii) an outer edge;(b) providing a core member from a second metal alloy different from said first metal alloy, said second metal alloy being harder than said first metal alloy by a predetermined relative amount, said core including:(i) generally parallel, opposed face portions spaced apart a predetermined distance corresponding to the initial thickness of said core member, each face portion having a peripheral rim which extends a predetermined distance above its respective face portion;(ii) a peripheral edge extending outwardly between the rims, said outer edge having a predetermined cross-sectional shape;(iii) there being a predetermined spacing between the peripheral edge of said core member and said inner edge of said outer member, adapted to allow a closely spaced but free placement of the core member in said opening;(c) placing said core member in the opening; and(d) plastically bonding the core member and the outer member together by plastically deforming by pressure the core member and the outer member to cause said outwardly extending peripheral edge of said core member to penetrate radially into the inner edge section of said outer member.