Method of producing wrist pins or similar articles

Claim 1

THE METHOD OF MAKING A HOLLOW CYLINDRICAL METAL ARTICLE WHICH COMPRISES CUTTING A WORKPIECE FROM A LENGTH OF METAL STOCK, FORMING A PERIPHERAL CHAMFER AT ONE END OF THE WORKPIECE AND AN INDENTATION IN SAID END WITHIN THE CHAMFER, THEN, BY THE ACTION OF A COOPERATING FIXED DIE AND MOVABLE PUNCH, APPLYING PRESSURE TO BOTH ENDS OF THE WORKPIECE WHILE THE LATTER IS WHOLLY CONFINED WITHIN A DIE TO FORM A RELATIVELY DEEP CYLINDRICAL OPENING IN SAID INDENTED FACE BY EXTRUDING THE METAL OF THE WORKPIECE AROUND THE PUNCH IN A DIRECTION TOWARD THE OPEN END OF THE DIE AND OPPOSITE THAT OF THE MOVEMENT OF THE PUNCH, AND THEN TURNING THE WORKPIECE END FOR END AND, BY THE ACTION OF A SECOND DIE AND MOVABLE PUNCH, AGAIN EXTRUDING THE METAL OF THE WORKPIECE AROUND A MOVING PUNCH IN A DIRECTION TOWARD THE DIE OPENING AND OPPOSITE THAT OF THE MOVEMENT OF THE PUNCH TO FORM A DEEP OPENING IN THE OTHER FACE OF THE WORKPIECE, LEAVING A RELATIVELY THIN WEB OF MATERIAL BETWEEN THE BOTTOMS OF SAID OPENINGS, AND SIMULTANEOUSLY INDENTING THE CENTRAL PORTION OF THE FACE OF THE WEB AT THE BOTTOM OF THE FIRST FORMED OPENING.

Claim 2

THE METHOD OF MAKING A HOLLOW CYLINDRICAL METAL ARTICLE WHICH COMPRISES CUTTING A WORKPIECE FROM A LENGTH OF METAL STOCK, FORMING A PERIPHERAL CHAMFER AT ONE END OF THE WORKPIECE AND AN INDENTATION IN SAID END WITHIN THE CHAMFER, THEN, BY THE ACTION OF A COOPERATING FIXED DIE AND MOVABLE PUNCH, APPLYING PRESSURE TO BOTH ENDS OF THE WORKPIECE WHILE THE LATTER IS WHOLLY CONFINED WITHIN A DIE TO FORM A RELATIVELY DEEP CYLINDRICAL OPENING IN SAID INDENTED FACE BY EXTRUDING THE METAL OF THE WORKPIECE AROUND THE PUNCH IN A DIRECTION TOWARD THE OPEN END OF THE DIE AND OPPOSITE THAT OF THE MOVEMENT OF THE PUNCH, AND THEN TURNING THE WORKPIECE END FOR END AND, BY THE ACTION OF A SECOND DIE AND MOVABLE PUNCH, AGAIN EXTRUDING THE METAL OF THE WORKPIECE AROUND A MOVING PUNCH IN A DIRECTION TOWARD THE DIE OPENING AND OPPOSITE THAT OF THE MOVEMENT OF THE PUNCH TO FORM A DEEP OPENING IN THE OTHER FACE OF THE WORKPIECE, LEAVING A RELATIVELY THIN WEB OF MATERIAL BETWEEN THE BOTTOMS OF SAID OPENINGS, AND SIMULTANEOUSLY INDENTING THE CENTRAL PORTION OF THE FACE OF THE WEB AT THE BOTTOM OF THE FIRST FORMED OPENING.