Method of forming blanks with internal and external torque engaging means

Claim 1

THE METHOD OF FORMING A HEADED ARTICLE HAVING A TOOL RECEIVING SOCKET IN THE HEAD THEREOF, AXIALLY EXTENDING WRENCH ENGAGING SERRATIONS ON THE EXTERIOR SURFACE OF THE HEAD THEREOF, AND A WASHER FLANGE AROUND THE BASE OF THE HEAD, SAID METHOD COMPRISING: (A) EXTRUDING A CYLINDRICAL WORKPIECE WHILE SUPPORTING THE SIDES OF SAID WORKPIECE AGAINST LATERAL DEFORMATION TO FORM A REDUCED SHANK PORTION AND AN UNWORKED HEAD PART, (B) PLACING SAID SHANK PORTION IN A HOLDING DIE, (C) APPLYING ENDWISE OVER SAID HAED PART AN EXTRUDING PRESSURE TO EXTRUDE THE SAME AND FORM WRENCH ENGAGING SERRATIONS THEREON HAVING A CREST DIAMETER SUBSTANTIALLY EQUAL TO THE DIAMETER OF SAID UNWORKED HEAD PART AND A LENGTH LESS THAN THE LENGTH OF SAID HEAD PART, (D) WITHOUT MOVING SAID WORKPIECE ADVANCING INTO SAID HEAD PART A RECESS FORMING PRESSURE AREA OF SUBSTANTIALLY SMALLER TRANSVERSE DIMENSION THAN THE ROOT DIAMETER OF THE EXTRUDED SERRATIONS ON SAID HEAD PART WHILE SIMULATANEOUSLY SUPPORTING THE OUTER SIDES OF SAID HEAD PART THROUGHOUT THE ENTIRE SERRATED PORTION THEREOF AGAINST SUBSTANTIAL LATERAL DEFORMATION, (E) CONTINUING THE APPLICATION OF SAID LAST MENTIONED PRESSURE WHILE CLOSELY SUPPORTING THE OUTER SURFACES OF SAID SERRATIONS AGAINST DEFORMATION SO AS FULLY TO FORM A WRENCH RECEIVING RECESS EXTENDING COAXIALLY INTO THE END OF SAID HEAD PART AND TO CAUSE LATERAL OUTWARD FLOW OF METAL ABOUT THE BASE OF SAID HEAD PART AND TO FORM A WASHER FLANGER HAVING A SURFACE FACING AWAY FROM SAID HEAD PART WXTENDING AT RIGHT ANGLES TO THE AXIS OF SAID SHANK.

Claim 2

THE METHOD OF FORMING A HEADED ARTICLE HAVING A TOOL RECEIVING SOCKET IN THE HEAD THEREOF, AXIALLY EXTENDING WRENCH ENGAGING SERRATIONS ON THE EXTERIOR SURFACE OF THE HEAD THEREOF, AND A WASHER FLANGE AROUND THE BASE OF THE HEAD, SAID METHOD COMPRISING: (A) EXTRUDING A CYLINDRICAL WORKPIECE WHILE SUPPORTING THE SIDES OF SAID WORKPIECE AGAINST LATERAL DEFORMATION TO FORM A REDUCED SHANK PORTION AND AN UNWORKED HEAD PART, (B) PLACING SAID SHANK PORTION IN A HOLDING DIE, (C) APPLYING ENDWISE OVER SAID HAED PART AN EXTRUDING PRESSURE TO EXTRUDE THE SAME AND FORM WRENCH ENGAGING SERRATIONS THEREON HAVING A CREST DIAMETER SUBSTANTIALLY EQUAL TO THE DIAMETER OF SAID UNWORKED HEAD PART AND A LENGTH LESS THAN THE LENGTH OF SAID HEAD PART, (D) WITHOUT MOVING SAID WORKPIECE ADVANCING INTO SAID HEAD PART A RECESS FORMING PRESSURE AREA OF SUBSTANTIALLY SMALLER TRANSVERSE DIMENSION THAN THE ROOT DIAMETER OF THE EXTRUDED SERRATIONS ON SAID HEAD PART WHILE SIMULATANEOUSLY SUPPORTING THE OUTER SIDES OF SAID HEAD PART THROUGHOUT THE ENTIRE SERRATED PORTION THEREOF AGAINST SUBSTANTIAL LATERAL DEFORMATION, (E) CONTINUING THE APPLICATION OF SAID LAST MENTIONED PRESSURE WHILE CLOSELY SUPPORTING THE OUTER SURFACES OF SAID SERRATIONS AGAINST DEFORMATION SO AS FULLY TO FORM A WRENCH RECEIVING RECESS EXTENDING COAXIALLY INTO THE END OF SAID HEAD PART AND TO CAUSE LATERAL OUTWARD FLOW OF METAL ABOUT THE BASE OF SAID HEAD PART AND TO FORM A WASHER FLANGER HAVING A SURFACE FACING AWAY FROM SAID HEAD PART WXTENDING AT RIGHT ANGLES TO THE AXIS OF SAID SHANK.