US 11,781,598 B2
Drive system with full surface drive contact
David C. Goss, Rockford, IL (US)
Assigned to Acument Intellectal Properties, LLC, Sterling Heights, MI (US)
Filed by ACUMENT INTELLECTUAL PROPERTIES, LLC, Sterling Heights, MI (US)
Filed on May 19, 2020, as Appl. No. 16/877,879.
Application 16/877,879 is a division of application No. 15/072,028, filed on Mar. 16, 2016, granted, now 10,697,499.
Claims priority of provisional application 62/135,390, filed on Mar. 19, 2015.
Prior Publication US 2020/0277996 A1, Sep. 3, 2020
Int. Cl. B25B 15/00 (2006.01); F16D 1/10 (2006.01); B21K 1/46 (2006.01); F16B 23/00 (2006.01)
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
OG exemplary drawing
 
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.