Patent ID: 8291795
Filing Date: 2012-10-23
Classification: B25B,F16B

Abstract:
1. 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 central portion and a plurality of wings radiating outwardly from the central portion, each of the 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 wing, and wherein the driving surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the fastener; a driver having a bit end, the driver having a central longitudinal axis, wherein the bit end is constructed having a central portion and a plurality of lobes radiating outwardly from the central portion, each of the 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 lobe, and wherein the driving surfaces of the lobes are constructed in parallel alignment with the central longitudinal axis; an interference interface further including: further wherein the driving surfaces of the fastener head are constructed to receive the driving surfaces of the driver bit end in a mated engagement and the first and second interface surfaces are constructed to form a frictional engagement when the fastener head and driver bit end are in the mated engagement, wherein the driving surfaces of the fastener head are constructed in a recess extending into the fastener head, and the recess is adapted to receive the driving surfaces of the bit end, and wherein the first and second interface surfaces are tapered at first and second angles respectively and wherein the first angle is larger than the second angle.