Quadrant punch for turret punch presses and the like

Claim 1

IN A TURRET TYPE PUNCH PRESS OR THE LIKE, A NIBBLING QUADRANT PUNCH FOR KNOCKING OUT ROUND HOLE OF GREATER DIAMETER THAN THE WIDTH OF THE PUNCH, SAID PUNCH COMPRISING A PUNCH MOUNTED FOR AXIAL MOVEMENT RELATIVE TO A FEMALE DIE, SAID PUNCH HAVING A RELATIVELY FLAT DOWNWARDLY-DIRECTED CUTTING SURFACE AND A PLURALITY OF ARCUATED SHAPED SIDE SURFACES, EACH SURFACE HAVING A DEFINING RADIUS WHICH IS GREATER IN LENGTH THAN ONE-HALF OF THE WIDTH OF THE PUNCH, AND A PLURALITY OF GENERALLY CYLINDRICALLY SHAPED ALIGNING HEELS MOUNTED WITHIN THE PUNCH FOR AXIAL MOVEMENT PARTIALLY INDEPENDENT THEREOF, AT LEAST A FEW OF SAID HEELS HAVING AN ARCUATELY SHAPED SIDE SURFACE FORMING PART OF THE PUNCH SIDE SURFACES, SAID HEELS BEING SPRING BIASED DOWNWARDLY IN ADVANCE OF THE PUNCH CUTTING SURFACE SO AS TO EXTEND INTO THE FEMALE DIE WHEN NOT ENCOUNTERING MATERIAL THEREON, SO THAT AFTER A SERIES OF STROKES AND MOVEMENT OF THE BLANK ON THE DIE A HOLE IS KNOCKED OUT HAVING A DIAMETER GREATER THAN THE WIDTH OF THE PUNCH AND HAVING A CIRCUMFERENCE DEFINED BY THE ARC OF THE PUNCH SIDE SURFACES.