Drive system with full surface drive contact
A drive system with full surface drive contact. The drive system tends to maximize the surface contact pattern or area at typical bit-recess reaction (drive) torque values, thereby tending to minimize bit-recess surface contact stresses, coating damage, recess ream and premature bit fatigue failure.
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.
2. A bit or punch as recited in claim 1 , wherein the bit or punch comprises a plurality of flutes, each flute comprising surfaces which are formed of polygon involutes.
3. A bit or punch as recited in claim 1 , wherein the bit or punch comprises a plurality of flutes, each flute comprising surfaces which are formed of polygon involutes.
4. A bit or punch as recited in claim 3 , further comprising a wall between each flute, said wall being flat.
5. A bit or punch as recited in claim 3 , further comprising a wall between each flute, said wall being concave circular.
6. A bit or punch as recited in claim 3 , further comprising a wall between each flute, said wall being convex vertex.
7. A bit or punch as recited in claim 3 , further comprising a wall between each flute, said wall being concave vertex.