HIGH SECURITY FASTENER

摘要

A security fastener for installation on a wheel having a recess hole extending from a recess entrance of a first diameter comprising an end portion concentric with a longitudinal axis of the fastener, the end portion configured to mate with a corresponding element of the recess hole, an intermediate skirt portion having a side wall region with a diameter within about 6 millimeters of the diameter of the recess entrance, a drive portion having a tapered outer surface and a plurality of circumferentially spaced longitudinally extending key-receiving grooves in the tapered outer surface arranged in a lock pattern to which a driving torque may be applied, the tapered outer surface sloping downward and outward away from the longitudinal axis of the fastener from a top surface to the skirt portion at a taper angle of at least 11 degrees.

主权项

1. A security fastener for installation on a wheel having a recess hole extending from a recess entrance of a first diameter, comprising:
a threaded end portion concentric with a longitudinal axis of said fastener; said threaded end portion configured and arranged to mate with a corresponding threaded element of said recess hole of said wheel when said fastener is installed in said recess hole; an intermediate skirt portion concentric with said longitudinal axis of said fastener and configured and arranged such that a side wall region of said skirt portion will extend within said recess hole when said fastener is installed in said recess hole; said side wall region of said intermediate skirt portion having a diameter within about 6 millimeters of said first diameter of said recess entrance; a drive portion having a tapered outer surface and a plurality of circumferentially spaced longitudinally extending key-receiving grooves in said tapered outer surface arranged in a lock pattern to which a driving torque may be applied; said drive portion configured and arranged such that said lock pattern will be exposed outside, at or inside said entrance to said recess hole when said fastener is installed in said recess hole; said tapered outer surface sloping downward and outward away from said longitudinal axis of said fastener from a top surface substantially perpendicular to said longitudinal axis of said fastener to said skirt portion at a taper angle from said longitudinal axis of at least 11 degrees.