CPC F16D 1/10 (2013.01) [B21K 1/463 (2013.01); B25B 15/004 (2013.01); B25B 15/005 (2013.01); F16B 23/003 (2013.01); F16D 2001/102 (2013.01)] | 7 Claims |
1. A bit or punch having a center and comprising a drive surface, said drive surface extending from an inner to an outer diameter formed of polygon involutes comprising a plurality of continuous tangent arcs, wherein each arc has a radius within the bit, wherein each arc is convex relative to the center of the bit, wherein each radius is constant but different, and wherein each radius has a center located on locus points of a radius at the center of the bit or punch.
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