Process for the production of chains and other ornamental items made of a lined tube bar and of similar objects
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United States of America Patent
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Jan 22, 1991
Grant Date -
N/A
app pub date -
May 23, 1989
filing date -
Sep 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for the production of an elongated composite member of circular cross section, comprising producing a hollow metal tube having an inside diameter, inserting in the hollow tube an elongated core of circular cross section of a light-weight, tough and ductile material having an outer diameter substantially smaller than the internal diameter of the tube, and reducing the diameter of the tube until said tube is firmly bonded to the outer surface of the core. Thereafter, the diameter of the tube and core together is reduced. The core is of aluminum and the tube is of copper alloy. The composite thus produced is formed into a jewelry chain and then gold plated.
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