Thin walled attached silver filled gold jewelry
OwnerRobert Groszinventor
Life of this patent
Estimating the term…
Abstract
A silver filled gold jewelry wire item includes an inner precious metal core, such as silver, and an outer gold layer. The outer gold layer has a predetermined thickness of from about 0.0001 inch to about 0.002 inch, preferably no more than 0.001 inch thick, which is much thinner than durable hollow wires of at least 0.004 inch in thickness or greater. A forming process draws a gold sheet strip into an open channel shaped member into which a solid silver core is placed at ambient temperatures. The open channel shaped member is closed by further rollers at ambient temperatures and welding of a seam when closed about the solid core. The resultant solid tubular gold jewelry wire item resists damage from diamond cutting knives, and can be used to create jewelry rope chains, earrings and bangles.
Claims41
A solid tubular gold jewelry wire item comprising a longitudinally extending outer layer of gold and a longitudinally extending inner core of a precious metal, wherein said jewelry wire item has a wall thickness of from about 0.0001 inch to no greater than 0.004 inch in thickness.
A method of making a solid tubular gold jewelry wire item having an outer gold layer of a predetermined thickness and an inner solid precious metal core, comprising the steps of:
- a. rolling a sheet of gold into a thickness of from about 0.009 to about 0.010 inches thick;
- b. trimming said gold sheet and passing said gold sheet through a slitter to trim said gold sheet into a gold strip having a width equal to the circumference of said solid tubular jewelry wire item to be formed;
- c. winding said trimmed gold strip onto a spool;
- d. feeding said trimmed gold strip from said spool through a roll former comprised of a plurality of pairs of rollers and guides in a plurality of roll forming steps further comprising:
- 1) forming said gold strip into a channel-shaped member;
- 2) forming said channel-shaped gold strip into a U-shaped member;
- 3) introducing precious metal core material from a spool onto a center of said U-shaped gold strip;
- 4) feeding said combination of said precious metal core material and said U-shaped gold member through a pair of pressure rollers for putting pressure on respective sides of said U-shaped gold strip, thereby partly closing said gold strip circumferentially around said precious metal core material into a partly-closed gold tube;
- 5) feeding said partly-closed gold tube containing said precious metal core material through a set of rollers for completing said circumferential closing of said gold strip into a gold tube surrounding said precious metal core material, and leaving a seam at a top of said gold tube;
- 6) feeding said cored gold tube through a pair of guide rollers for precisely locating said seam for welding;
- 7) feeding said seam-located cored gold tube through a welder for welding said seam closed;
- 8) feeding said seam-welded cored gold tube through exit rollers;
- and then
- e. feeding said seam-welded cored gold tube through a wire-drawing die at least twice to reduce its diameter and to pressure-lock said core with said gold-tube outer layer, thereby creating a solid wire comprised of a gold outer tube of a predetermined thickness in a secure adhesive contact with said precious metal core material;
- and then
- f. feeding said cored gold wire through diameter-reducing wire drawing dies wherein said gold outer-layer thickness is reduced proportionally to a diameter reduction of said cored gold wire from before to after being subjected to said diameter-reduction wire drawing dies;
- and then
- g. continuing to feed said cored gold wire through said diameter-reducing wire drawing dies until a diameter reduction of said cored gold wire of from about 50% to about 60% has been achieved;
- and then
- h. annealing said cored gold wire at a temperature of about 1200 degrees Fahrenheit.
A solid tubular gold jewelry wire item having an outer precious metal layer of from 0.0001 to about 0.002 inch thickness, and an inner solid precious metal rod core, produced by the process of:
- a) feeding at ambient temperature a solid precious metal rod core into an open longitudinally extending precious metal outer tube;
- b) closing said open longitudinally extending precious metal tube;
- c) feeding said open longitudinally extending precious metal tube having said solid precious metal rod core through a wire drawing die at ambient temperature;
- d) reducing its thickness and pressure;
- e) taking said precious metal core to said precious metal tube;
- and,
- thereby creating a solid wire comprised of said outer precious metal layer in a secure adhesive contact with said precious metal rod core.
A solid tubular gold jewelry wire item comprising a solid longitudinally extended outer layer of a precious metal and a solid longitudinally extended inner core of a soft precious metal soldered to the outer layer, wherein said jewelry wire item has a wall thickness of from about 0.0001 inch to no greater than 0.004 inch in thickness.
A solid gold jewelry item comprising an outer layer of gold and a solid inner layer of a soft precious metal joined to said outer layer, wherein said gold jewelry item includes said outer layer of gold with a wall thickness of from about 0.0001 to no greater than 0.004 inches.
Dependencies are inferred from the claim text.