Patent ID: 7311022

Claim:
A retention socket for torquing and retaining a fastener, the socket comprising: a body having a plurality of interior faces disposed about a receptacle for receiving a fastener having a plurality of sides, said body having an open end and a closed end and said receptacle having an axis of rotation, at least one interior face having at least two retention ridges separated by a surface forming a concave depression so that at least one of the sides of the fastener, when received in the receptacle, is engageable by both retention ridges and not by the surface, wherein the interior face is generally convex as viewed from an axis of rotation of the receptacle, except for the concave depression formed in the interior face, and each of said retention ridges, being formed as an arcuate linear edge, converges to form an apex proximate the closed end and each retention ridge slopes towards the axis of rotation as they converge.