Patent ID: 8616097

Claim:
A fastener system comprising: a fastener having a head and a shank, the fastener having a central longitudinal axis, wherein the head is constructed having a recess, the recess having a central portion and a plurality of fastener recess wings radiating outwardly from the central portion, each of the fastener recess wings having an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward-most portion of the fastener recess wing, and wherein the fastener driving surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the fastener; a driver having a driver bit end, the driver having a central longitudinal axis, wherein the driver bit end is constructed having a central portion and a plurality of driver lobes radiating outwardly from the central portion, each of the driver lobes having an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward most portion of the driver lobe, wherein the driver driving surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the driver, and wherein the fastener recess is adapted to receive the driver bit end such that the fastener driving surfaces receive the driver driving surfaces in a mated engagement; and an interference interface including: a driver interference contour formed in at least one of the non-driving transition contours of the driver lobes, wherein the driver interference contour is tapered inward, toward a tip of the driver, with respect to the central longitudinal axis of the driver at a driver taper angle; and a fastener interference contour formed in at least one of the non-driving transition contours of the fastener recess wings, wherein the fastener interference contour is tapered inward, toward a bottom of the recess, with respect to the central longitudinal axis of the fastener at a fastener taper angle, wherein the driver taper angle is larger than the fastener taper angle, and wherein the driver interference contour and the fastener interference contour are constructed to form a frictional mated engagement at the interference interface when the fastener recess and driver bit end are in the mated engagement.