Patent ID: 7153214

Claim:
A driver to transmit force from a tool to a workpiece, the tool having a square tang with a C-ring circumscribing the square tang, said driver comprising: a. a body having a first end, a generally cylindrical second end and a central longitudinal axis extending between said first and said second ends; b. a first bore formed in said first end and generally centered about said central longitudinal axis, said first bore having a first end proximate said body first end and a second end distal from said body first end; and c. a second bore formed in said generally cylindrical body second end and generally centered about said central longitudinal axis, said second bore having, a first bore portion having a first end distal from said body second end and adjacent to said first bore second end, a second end proximate to said second body second end, and a plurality of sidewalls being generally parallel to said central longitudinal axis and defining a generally square cross-section transverse to said central longitudinal axis, a generally cylindrical second bore portion having a first end intermediate said first bore portion first end and said first bore portion second end, and a second end proximate to said cylindrical body second end, said generally cylindrical second bore portion having a diameter that is larger than a width across two opposing sidewalls of said generally square first bore portion so that said generally cylindrical second bore portion forms arcuate recesses in each of said plurality of first bore portion sidewalls, and a tapered third bore portion intermediate said first bore portion and said generally cylindrical second bore portion, a wall of said tapered third bore portion being angled sufficiently to compress the C-ring on the tool tang when the tool tang is inserted into said second bore.