Process for manufacture of jewelry and jewelry made thereby

Details Process for manufacture of jewelry and jewelry made thereby Process for manufacture of jewelry and jewelry made thereby

2000-06-28

2001-08-14

Zimmerman, John J. (Department: 1775)

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

C428S607000, C428S598000, C428S672000, C063S004000, C063S038000

Reexamination Certificate

active

06274250

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method for producing semifinished jewelry products from a composite wire, and to a method for making finished articles of jewelry.
The present invention also relates to a process for producing composite wire as well as ornamental articles, in particularly of annular form, or chains made with said articles which can be manufactured from the composite wire by means of a mechanical process and an emptying process.
DESCRIPTION OF THE PRIOR ART
Techniques for producing “hollow” articles, i.e., articles composed of tubular elements in various conformations to form chain links, earrings, charms, and the like in precious metals are well known in the field of goldsmithery.
The most widely used technique used in manufacturing ornamental articles made of hollow wire, mainly for ornamental chains, is one in which there is used a composite wire formed from a support core of a nonprecious metal (iron, copper, or special alloys, such as tombak), on which a lamina of precious metal is folded. The lamina is firmly secured to the support core by engaging the longitudinal edges of the lamina in respective axial grooves formed on the surface of the support cores and subjecting this intermediate semifinished product to a mechanical drawing process in order to obtain the desired diameter. The composite wire obtained by this technique can be used in manual or mechanical processing, just as a solid wire is used, for example, to produce ornamental chains. The internal support cores is subsequently removed (called an emptying process) by subjecting the products to chemical or electrochemical treatment. This technique is described in Italian patent No. 1154682.
In the process described above, it is possible to obtain wire material of a conventional form allowing only for the possibility of changing the cross section. Furthermore, it is not possible with this technique to create a wire comprising more than one type of precious metal. There is a great demand in the field of gold craftsmanship for methods for producing new ornamental shapes and new techniques for making these shapes, which have a high level of flexibility of application and which offer opportunities for creative activity on the part of the designer.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a composite wire of a novel structure that can be used in the field of gold craftsmanship for manufacturing semifinished products to be subjected to an emptying process to produce articles of jewelry having an original configuration.
It is another object of the present invention to provide a composite wire of the above-mentioned type as well as a method for producing such wire which provides the designer with a vast range of possibilities to create articles of jewelry having an original configuration.
These and other objectives of the invention, which will become apparent in the description which follows, are accomplished with the composite wire according to the present invention whose novel feature is that is comprises an elongate support core made of a nonprecious metal that can be removed by chemical or electrochemical means as well as a plurality of elongate sections made of precious metal, of which at least a portion of which is radially engaged in the core.
In one currently preferred embodiment of the present invention, the sections are engaged in grooves having a depth equal to the width of the sections. Alternatively, the sections are incorporated in the core inside grooves which have a depth greater than the width of the sections and which close over them.
The sections can be flat, curvilinear, or C-shaped in form.


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patent: 604599 (1978-09-01), None
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patent: 0638256 (1995-02-01), None
patent: 1154682 (1987-01-01), None
patent: 1-210115 (1989-08-01), None
patent: 1-253435 (1989-10-01), None

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