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Publication numberUS450412 A
Publication typeGrant
Publication dateApr 14, 1891
Filing dateSep 22, 1890
Publication numberUS 450412 A, US 450412A, US-A-450412, US450412 A, US450412A
InventorsGeorge E. A. Knight
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 450412 A
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Description  (OCR text may contain errors)


(No Model.)

No. 150,412 Patented Apr. 14, 1891.




SPECIFICATION forming part of Letters Patent No. 450,412, dated April 14, 1891.

Application filed eptember 22,

To all whom it may concern:

Be itknown that I, GEORGE E. A. KNIGHT, of the city of Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Jewelers Stock; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention has reference to an improve ment in the art of manufacturing tubes, bars, rods, and wire for jewelers use in stripes of different metals or metals of different colors.

The invention consists in the peculiar and novel method of producing jewelers stock by forming sheets having strips of different-colored metal extending through the thickness of the sheet, soldered or welded together into tubes, twisting the tubes, and drawing the same into stock of any desired section, as will be more fully set forth hereinafter.

The present invention is an improvement on the invention described in the application for Letters Patent filed by me July 2, 1890, Serial No. 357,549, for an improvement in jewelers stock.

The object of this invention is to produce jewelers stock both surfaces of which are diagonally striped, consisting of diagonal stripes of different color or diagonal stripes of different metal secured together edgeto edge.

The invention described in my previous application required the strips to be secured to a sheet or block of inferior metal, and when rolled out into a thin sheet consisted of a sheet of inferior metal plated with a thin sheet of striped metal, thus forming a sheet of stockplate one surface of which was striped.

I have found in practice that an ingot can be readily formed by securing the different metals or the strips of precious metal of different color together, either by the well-known sweating process or by soldering the strips together. This ingot can be rolled into a sheet and used for all the purposes for which the striped stock-plate described in my pre- 1890. Serial No. 365,732- (No model.)

any desired width and depth, soldered or welded together. Fig. 2 is a perspective view of a sheet formed of strips of dilferent-colored metal. Fig. 3 is a perspective view of a tube formed of a sheet of the striped metal. Fig. 4 is a perspective view of a tube formed of a sheet of the striped metal which has been twisted, showing the stripes of ditferent-colored metal extending through the thickness of the tube. Fig. 5 is a perspective view of a strip of my improved consolidated jewelers stock, showing diagonal stripes of differentcolored metal.

In the drawings, the number 6 indicates a strip of metal of one color and the number 7 a strip of another color. These strips may be all of gold, each strip being of a different color. Red, green, blue, and other colors are readily produced to form these strips. The strips 6 and 7 may also be made of different metals. Gold, silver, platinum, and other metals or compositions of metals may be used to form the strips of the ingot, and these strips may be of uniform width or they may differ in width and may be of any uniform depth. As the strips are firmly secured to one another, they can be rolled, drawn through a draw-plate, and twisted without being distorted or loosened. The prepared stock can be worked into any desired article in the same manner as jewelers stock is now used and a great variety of highly-ornamented articles produced.

I will now more fully describe the process for manufacturing the same. The prepared ingot, (shown in Fig. 1,) consisting of the al ternate strips of different-colored metal firmly secured to one another, I subject to the process of rolling longitudinally with the direction of the strips 6 and 7, by which the thickness is reduced and the length increased without materially altering the width. Then the ingot is thus rolled out or drawn into a sheet of the desired thickness, the sheet (shown in Fig. 2 is formed into a tube, the strips extending through the thickness of the sheet forming the tube as shown in Fig. 3 The joint in the tube may be soldered or welded. To produce a diagonal stripe, the tube is now twisted in the usual manner in a twister-head. The longitudinal stripes are thus placed at any desired angle around the axis of the ICO twisted tube, as shown in Fig. 4. The soformed twisted tube is now drawn through a draw-plate, the area of which isless than the area of the sectional outline of the tube, so as to consolidate and lengthen the tube, and the tube is so successively drawn through draw-plates or elongated and reduced in thickness by rolling until a tube, rod, 01' wire of the desired size and cross-section is produced.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent- 1. The herein-described process for manufacturing diagonally-striped jewelers stock, the same consisting in securing together edge to edge strips or plates of precious metal varying in color to form an ingot, rolling out the ingot into a sheet, bending the sheet into GEO. E. A. KNIGHT. Witnesses:


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3063137 *Oct 26, 1960Nov 13, 1962Leach & Garner CoJeweler's stock
US3171195 *Jun 11, 1962Mar 2, 1965Johnson Matthey Co LtdProduction of composite metal strip
US3184840 *Aug 1, 1962May 25, 1965Texas Instruments IncMethods of making variegated stock
US3465419 *May 22, 1964Sep 9, 1969Engelhard Ind IncMethod of making decorative metal stock
US3667098 *Jul 24, 1969Jun 6, 1972Filigree Arts IncMethod of manufacturing ornamental element
US4891276 *Oct 24, 1984Jan 2, 1990Ursula ExnerArticle of jewelry of platinum and fine gold
US6274250 *Jun 28, 2000Aug 14, 2001Cento Group S.P.A.Process for manufacture of jewelry and jewelry made thereby
US6601301 *Sep 10, 2001Aug 5, 2003Lacchetti GianpaoloJewelry formed by sections of multiply colored elements and process for making the same
US6739052 *Apr 19, 2002May 25, 2004Ronald PrattMethod of making striped metal beads
US8590357 *Nov 11, 2010Nov 26, 2013Mokumeganeya Co., Ltd.Metal manufacturing method, apparatus of the same and metal object
US20110113849 *Nov 11, 2010May 19, 2011Masaki TakahashiMetal manufacturing method, apparatus of the same and metal object
Cooperative ClassificationC22C49/00, Y10S428/927