Method for the manufacture of non-allergy creating precious meta

Details Method for the manufacture of non-allergy creating precious meta Method for the manufacture of non-allergy creating precious meta

1987-09-21

1990-02-20

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

420587, 420588, 420589, 420590, C22B 1100

Patent

active

049023420

ABSTRACT:
A method and an apparatus for the manufacture of non-allergy creating objects, especially objects of metal for direct contact with the skin of a human body, for instance jewelery, watches, glasses etc. whereby completely pure metals, especially precious metals like gold, silver, platinum, palladium, rodium etc. are alloyed with optimum pure zinc, copper, aluminum, nickel or chrome, and whereby any and all treatments both in hot and cold stage are made without access of air and without any contact with extraneous substances like salts or acids. Preferably all melting and heating is made under a protective gas. An apparatus for executing the method according to the invention may comprise a movable table (61) for advancing a cold worked object (66) through a heating channel in counter current to a heating gas or a protective gas (70), and in which the heating channel (63) is directly connected to a cooling channel (68) which makes use of the exhaust gases from the heating channel (71, 73) as cooling and protective gas during the cooling operation, whereby the advancing of the object (66) through the cooling channel is made concurrently with the flow of cooling and protective gas.

REFERENCES:
patent: 3613209 (1971-10-01), Piquerez

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