Patent ID: 7891274
Filing Date: 2011-02-22
Classification: B25B,F16B,Y10T

Abstract:
1. A fastener system comprising: a fastener having a head and a shank wherein the head is constructed having driver engageable surfaces and said driver engageable surfaces define multiple wings radially extending from a central core; a driver having a bit end constructed with mating surfaces for engagement with the driver engageable surfaces of the recess in the fastener head and said mating surfaces define multiple projections radially extending from a central core matching the wings; wherein each of said projections are constructed with a cross sectional shape comprising an installation surface, a tip portion and a removal surface that define the projection, and wherein each of the projections are connected by a transition surface extending between the installation and removal surfaces of adjacent projections and where the transition surface conforms to a circumference of the central core; wherein the cross sectional shape comprises a projection having a width and a height and the ratio of the projection height to the projection width is equal to or less than 0.5; and further wherein the driver engageable surfaces of the fastener head are constructed to receive the mating surfaces of the driver.