Patent ID: 7226262

Claim:
In a drive socket of a threaded male fastener which is driven by a key wrench driver having a plurality of flat surfaces and a plurality of corners at intersections between the plurality of flat surfaces, the improvement comprising: a plurality of rounded lobes defined in the drive socket, said plurality of rounded lobes being positioned about a center of the drive socket of the fastener, said plurality of rounded lobes including contact surfaces, the plurality of rounded lobes receiving a set of alternating ones of said plurality of flat surfaces of the key wrench driver; a plurality of flat non-contact sections defined in the drive socket, said plurality of flat non-contact sections being positioned about the center of the fastener and including non-contact surfaces, each non-contact section being located between adjacent rounded lobes and substantially opposite one of the rounded lobes, and the plurality of corners of the key wrench driver remaining out of contact with said plurality of flat non-contact sections; and curved recesses defined in the drive socket, said curved recesses transitioning between the flat non-contact sections and the adjacent rounded lobes, and the plurality of corners of the key wrench driver remaining out of contact with said curved recesses.