(No Model.) J, HOLLAND, DRAW PLATE No. 285,896, Patented Oct. 2, 1883.

UNITED STATES PATENT OFFICE.

JOHN HOLLAND, OF CINCINNATI, OHIO, ASSIGNOR TO THE AMERICAN IRIDIUM COMPANY, OF SAME PLACE. DRAW, PLATE.

SPECIFICATION forming part of Letters Patent No. 285,896, dated October 2, 1888. Application filed October 3, 1882. (No model.) To all uhon, it nagy concern, In the accompanying drawings, Figue Irep Be it known that I, JOHN HOLLAND, a citi resents my draw-plate in front elevation. Fig. Zen of the United States, residing at Cincin II is a central section through line acac of Fig. nati, Ohio, have invented certain new and use I. Fig. III is a similar section of the partially ful Improvements in Draw-Plates, of which finished plate. N. the following is a specification. A represents a plate of brass or soft steel, My invention relates to plates for drawing which has a cavity turned or bored out to re Wire tubes, &c.; and it consists in making ceive the iridium bushing B. Around the 55 the draw-eye of iridium phosphide or phos cavity in plate A a groove is turned, leaving O phide of iridium combined with other metals. a ring or flange, ct, which, when the bushing Prior to my invention draw-plates have B is inserted, projects up around it. The been made of tempered steel or chilled iron bushing or draw-eye is dressed and finished for ordinary use, and for fine light Work in substantially the manner that ruby bush rubies, diamonds, and other precious stones ings are now prepared, and when inserted in have been used. The steel plate lasts but a the plate A the flange ( is spun down upon it, short time and its work is never perfect. It firmly embedding it in the plate A. The per cannot be tempered or chilled after the draw forations through the bushing and plate regis eyes are formed, because the holes would not ter with each other, of course. 65 keep their shape. When the plate is chilled, The plate or metal from which I form my the outer surface of the metal only is very bushing is prepared for some uses by the pro hard, while the interior, where the bearing of cess described in Letters Patent No. 241,216, the draw-eye comes, is comparatively soft. granted to me May 10, 1881, but preferably 7o In use the plate is heated by fiction. The from an alloy of iridium or iridium phosphide temper is thereby drawn, and the wire drawn and iron or platinum, or iridium, iron, and 25 through is never of uniform gage, owing to platinum, using, when platinum and iridium the expansion of the metal. To overcome only are employed, from five to ten percent., by these defects rubies and other precious stones Weight, of platinum, and when iron is used have been used; but, in addition to being very alone from ten to twenty per cent. of iron. 75 costly, they have not sufficient strength to I prepare the alloy by first placing the irid stand heavy work, and many of them, after ium in a crucible and subjecting it to a high being drilled, are found to have cracks and heat, then adding to it about one-fourth its fissures in them, which render them worthless. weight of phosphorus, and when the iridium By my invention all these defects are remedied, has fused then add the other metal and stir and I am enabled to produce draw-plates until thoroughly mixed, when the metal is which have all the advantages of the jewel poured into molds of the desired shape. For and steel plates combined. small draw-plates I prefer to cast the metal in I have discovered that iridium or the phos thin sheets, cut it into pieces by means of 85 phide of iridium, when fused, molded, and fin copper disks and diamond dust or corundum, ished for a draw-plate, has all the hardness and drill the pieces in the same manner as required, combined with the requisite strength rubies are drilled; but for the larger plates for all kinds of work, and is capable of re the holes are cast to near the proper size, using ceiving a high polish, thereby reducing fric a plumbago or metal core. The labor of drill- go tion and preventing “scratching, so that ing the hole is thus saved, and the plate is plated Wire and tubes may be drawn. Be dressed and finished as ruby and diamond 45 sides, it does not expand perceptibly when plates are. heated, and has no “temper’ to be drawn, I have found that the alloys above described but retains its original hardness at a heat that will answer for draw-plates for every pur- 95. would fuse the ductile metals, pose; but I do not limit myself to them alone, as other metals, especially copper, silver, and A, and jointly therewith a bushing, B, made nickel, alloyed withiridium in the same man- of iridium or iridium alloy, substantially as IO ner, make excellent draw-plate metal. specified. I1. claimAs a asnew my article invention- of manufacture, a draw- . JOHN HOLLAND. eye or bushing for draw-plates, consisting Witnesses: wholly or mainly of iridium. ALFRED B. BENEDfCT, 2. A draw-plate consisting of a metal plate, GEO. J. MURRAY.