Patent ID: 7189239

Claim:
A saw blade comprising a blade body having a longitudinal axis; a cutting means disposed at a first end of said blade body; a prearranged hub section having an outer periphery located at a second end of said blade body, said prearranged hub section comprising an elongated slot formed in said hub section which extends from said outer periphery along a longitudinal axis to a U-shaped cutout forming a hub center, said hub center being along said longitudinal axis; a plurality of slots, each of said slots having a generally rectangular elongated blade driving enabling section having one end which terminates in an expanded bulbous blade driving disabling section in a position opposed to the hub center, the respective generally rectangular elongated blade driving enabling section being disposed in a pattern along a radius centered at the hub center; said respective generally rectangular elongated blade driving enabling section of each slot being configured for engaging with at least one of a plurality of rectangular driving lugs terminating in a substantially rectangular outer end arranged in a pattern and a plurality of rectangular driving lugs terminating in a substantially circular outer end arranged in a pattern to drive said saw blade in response to a driving force therefrom and wherein said respective expanded bulbous blade driving disabling section of each slot is substantially oval shaped or substantially oval shaped having an indentation extending substantially perpendicular to the substantially oval shape and in a direction away from the hub center and dimensioned for disengaging from a plurality of circular driving pins arranged in a pattern disengaging over a predetermined range of a plus angle and a minus angle a driving force therefrom along a locus of points which avoids driving said saw blade in response to a driving force therefrom.