Patent ID: 8662806
Filing Date: 2014-03-04
Classification: F16B,Y10T

Abstract:
1. A self-drilling anchor screw, comprising: a shaft member extending along a longitudinal axis of the screw, the shaft member comprising a first end, second end, and a central portion extending between the first and second ends; a drill bit portion at the first end of the shaft member; a threaded shaft portion located along at least part of the central portion of the shaft member; a nut having nut threads adapted to thread onto the threaded shaft portion of the shaft member, and the nut being located on the threaded shaft portion; an expandable sleeve located about the shaft member; and a nut stop portion at the second end of the shaft member, the nut stop portion being adapted to prevent the nut from being unscrewed from the threaded shaft portion at the second end of the shaft member, wherein a largest cross-section dimension of the nut stop portion, as taken perpendicular to the longitudinal axis, is smaller than an outside cross-section dimension of the nut, as taken perpendicular to the longitudinal axis.