Metal working – Method of mechanical manufacture – Electrical device making
Patent
1982-03-26
1984-05-08
Combs, E. Michael
Metal working
Method of mechanical manufacture
Electrical device making
10 27R, 228115, H01R 4304, B21K 162, B23K 2002
Patent
active
044466188
ABSTRACT:
A process for the production of bi-metallic contact rivets with especially thin precious metal layers. The process includes the insertion of two wire segments of congruous diameter but of different length and different composition into a guide bush which fits these; arranging the wire segments between an ejector pin displaceable lengthwise in the guide bush, and an abutment with a cross-sectional surface which is larger than the cross-sectional surfaces of the wire segments, which abutment is arranged coaxially to the ejector pin outside the guide bush and initially abutting the adjacent one end surface of the guide bush; while pushing forward the ejector pin in the guide bush, the abutment is simultaneously withdrawn away from the guide bush, the velocity of the abutment being smaller than that of the ejector pin; thereby upsetting the wire segments in accordance with the decreasing distance between the adjacent surfaces of the ejector pin and of the abutment, and forming a blank of a cylindrical shape; the contact rivet head is formed by cold press-working at that end of the blank where the short wire segment is found, the rest of the blank serving as the rivet shaft.
REFERENCES:
patent: 3371414 (1968-03-01), Gwyn
patent: 4073425 (1978-02-01), Bollian
patent: 4232812 (1980-11-01), Shibata
patent: 4373369 (1983-02-01), Schey
Combs E. Michael
Dr. Eugen Durrwachter Doduco KG
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