J. Holland. Draw Plate

(No Model.) J. HOLLAND. DRAW PLATE. 1 I _ No. 285,896. ‘ Patented octz‘zf 1'883. UNITED STATES arnnr tries. 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, 11883.‘ Application ?led October 3, 1882. (N0 model.) To all whom it may concern. In the accompanying drawings, Figui e I rep Be it known that I, JOHN HOLLAND, a citi resents my draw-plate in front elevation. Fig. 50 zen of the United States, residing at linciu~ II is a central section through line as 00 of Fig. nati, Ohio, have invented certain new and use I. Fig. III is a similar section of the partially ful Improvements in.Draw-l?lates, of which ?nished plate. \ the following is a speci?cation. 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 10 phide of iridium combined with other metals. a .ring or ?ange, a, which, when the bushing Prior to my invention draw-plates have 13 is inserted, projects up around it. The been made of tempered steel or chilled iron bushing or draw-eye is dressed and ?nished 60 for ordinary use, and for line 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 ?ange a is spun down‘ upon it, short time and its work is never perfect. It ?rmly 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. \Vhen 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 ‘ In use the plate is heated by friction. The from an alloy of iridium oriridium 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 ?ve to ten per cent, by these defects rubies and other precious stones weight, of platinum, and when iron is used 75 have been used; but, in addition to being very alone from ten to twenty per cent. of iron. costly, they have not su?icient strength to I prepare the alloy by ?rst 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 ?ssures in them, which render them worthless. weight of phosphorus, and when the iridium 80 By my invention all these defects are remcdi ed, has fused 1. 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 admntages 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 8% » phide of iridium,when fused, molded, and ?n~ 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 4.0 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 propersize, using ceiving a high polish, thereby reducing fric a plumbago or metal, core. The labor of drill tion and preventing “scratching,’7 so that ing the hole is thus saved, and the plate is plated wire and tubes may be drawn. Be dressed and ?nished 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 drawplates for every pur 95. would fuse the ductile metals° pose; but- I do not limit myself to them alone, 285,896 as other metals, especially copper, silver, and A,v and jointly ‘therewith a bushing, B, made nickel, alloyed with iridium in the same man of iridium or iridium alloy, substantially as 10 ner, make excellent draw-plate metal. speci?ed. I claim as my invention— I 1. As a new article of manufacture, a draw- JOHN HOLLAND‘ 5 eye or bushing for draw-plates, oonsi sting \Vitnesses: Wholly or mainly of iridium. ALFRED B. BENEDfO/T, 2. A draw-plate consisting of a metal plate, , G120. J. lVIURRAY. .

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