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Publication numberUS422647 A
Publication typeGrant
Publication dateMar 4, 1890
Filing dateSep 18, 1889
Publication numberUS 422647 A, US 422647A, US-A-422647, US422647 A, US422647A
InventorsHenry T. Smith
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 422647 A
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Description  (OCR text may contain errors)

(No Model.)


Patented Mar. 4, 1890.

w m H MN 6 @513 a ike anal UNITED STATES PATENT ()EEICE.



SPECIFICATION forming part of Letters Patent No. 422,647, dated March 4, 1890.

Serial No. 324,297. (No model.)

To all whom it may concern:

Be it known that I, HENRY T. SMITH, of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in the Art of and Ingots for the Manufacture of Seamless Plated Wire, of which the following is a specification.

Myinvention has for its object the provision of a mode of and ingot for the manufacture of seamless plated wire for the manufacture of watch and other chains, bracelets, rings for parasols, as well as various other articles of jewelry, &c., whereby the said articles of manufacture can be more economically and expeditiously manufactured than heretofore, and whereby, also, the gold plate may be securely fused with or connected to the base metal. S

My invention. comprises the formation of a hollow ingot by connecting athin plate of gold or other high-grade metal with a thick plate of copper or other comparatively base metal by means of hard solder, or in other suitable manner, then forming the plate thus compounded into an ingot by pressing it into a cap or thimble like tube with the gold or highgrade metal on the outside of such ingot, and, finally, spinning, drawing, or rolling down the ingot thus formed into a seamless plated wire or hollow seamless rod or tube.

My invention will first be described in connection with the accompanying drawings, forming apart of this specification, and be subsequently pointed out in the claims.

Of the said drawings, Figure 1 is a plan view of a circular plate of metal, which may in this instance be supposed to be copper. Fig. 2 is a sectional view of the same, showing a thin sheet of gold'soldered to the under side thereof. Fig. 3 represents the sheet after the action of the first set of dies, thereon in the operation of forming the sheet into an ingot. Fig. 4 represents the sheet after the operation of the second set of dies. Fig. 5 represents the completely-formed ingot died up from the sheet.

The same letters of reference designate the same parts in all of the views.

In carrying out my invention I take a thick plate a of comparatively base metal, preferably, though not necessarily of copper, and secure upon one face thereof by means of hard solder or in other suitable manner a thin sheet I) of gold or other comparatively high-grade metal, all as clearly shown in Fig. 2. I then take the blank thus formed and compress or die it up into a cap or thimble like tube or ingot o in such manner that the gold or high-grade metal will be on the exterior and the base metal form the core of the ingot, which may have a small hollow extending from near the cap end through the opposite end, as shown by dotted lines in Fig. 3. l

finally spin or draw down the ingot thus and, secondly, the dieing up of the blank into a cap or thimble like ingot 0, though in so constructing the hollow it may be necessary to pass it through successive dies to give it proper form in order that hollow tubing or wire may be formed therefrom.

I do not fill the hollow which maybe formed or left in the ingot in any manner whatsoever, since such hollow does not interfere with the formation of wire from the ingot;

nor does it act detrimentally in the wire made 8 5 from the ingot, but on the contrary is beneficial, since from this construction it is rendered expedient, by the employment of a mandrel in the hollow of the ingot, or by using other suitable means, to manufacture hollow 9o plated wire-a result that is, for many purposes, very desirable. I

Plated wire thus formed is. particularly well adapted for the manufacture of watch and neck chains and other articles of jewelry. 5

It is a special object of my invention to secure a hollow ingot and to dispense with the supplementary core which has hitherto been used, and which requires a subsequent soldering to the previously-formed shell, the base metal of my ingot forming its own core or filling so far as such thing is needed.

By spinning or drawing down the hollow ingot over a mandrel or arbor a hollow seamless gold-plated tube may be readily formed, which can be manufactured into rings for parasols, bracelets, and a Variety of other artieles, and this is an important feature of the invention and a thing that could not be accomplished heretofore.

Having thus described the nature of myinvention and explained a way of practicing and using the same, I declare that what I claim is- 1. An ingot for the manufacture of scamless plated hollow wire, consisting of a hollow body constructed as described, and composed of copper or comparatively base metal having an exterior of gold or higlrgrade metal, substantially as set forth.

2. The improvement in the art of forming plated hollow wire, consisting in soldering a plate of liiglrgrade metal on a plate of comparatively base metal, dieing up the blank thus formed into a hollow or cup or thimble like ingot, with the high-grade metal on the outside, and then drawing or spinning a wire from such ingot, as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this lath day of September, A. D. 1889.



lftcumn'r W. BURBANK, CHARLES l). Wool).

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4962007 *Nov 15, 1989Oct 9, 1990Verne Q. Powell Flutes, Inc.Flute tubing of laminated metal including a bonded layer of precious metal alloy
Cooperative ClassificationH01L2924/14, Y10S428/927