Device for drawing billet and bar stock

Claim 1

IN AN APPARATUS FOR THE DRAW-FORGING OF ELONGATED DUCTILE METAL STOCK WHEREIN TWO PAIRS OF DIE JAWS ARE SWINGABLY MOUNTED FOR ECCENTRIC SYMMETRICAL DISPLACEMENT TRANSVERSE TO SAID STOCK BY A DRIVE MEANS, THEREBY DEFORMING SAID STOCK TRANSVERSELY WHILE FORCING MATERIAL THEREOF FORWARDLY AND THEREAFTER RETURNING TO RESPECTIVE STARTING POSITIONS FOR REPETITION OF THE DRAWING OPERATION, SAID PAIRS OF JAWS BEING ANGULARLY OFFSET THROUGH AN ANGLE OF ABOUT 90* ABOUT THE AXIS OF SAID STOCK, THE IMPROVEMENT WHICH COMPRISES: RESPECTIVE DIE FACES ON EACH OF SAID JAWS HAVING A RIDGE CONFRONTING SAID STOCK AND LONGITUDINALLY SUBDIVIDING THE RESPECTIVE FACE INTO A MAIN-SHAPING SURFACE AND A SMOOTHING SURFACE SUCCESSIVELY ENGAGEABLE WITH SAID STOCK, SAID MAIN-SHAPING SURFACES OF THE JAWS OF EACH PAIR HAVING A DISTANCE OF CLOSED APPROACH LESS THAN THE CORRESPONDING FINAL DIMENSION OF SAID STOCK AND SAID SMOOTHING SURFACES OF THE JAWS OF EACH PAIR HAVING A DISTANCE OF CLOSEST APPROACH EQUAL TO SAID FINAL DIMENSION; AND MECHANISM FOR ALTERNATELY DISPLACING SAID PAIRS OF JAWS REPEATEDLY FOR THE DRAW-FORGING OF SUCCESSIVE PORTIONS OF SAID STOCK, THEREBY INITIALLY EXPANDING SAID STOCK BEYOND SAID FINAL DIMENSION UPON EACH ENGAGEMENT OF SAID JAWS WITH SAID STOCK FOR SUBSEQUENT COMPRESSION OF THE STOCK TO SAID FINAL DIMENSION BY SAID JAWS.