Patent ID: 6120225
Filing Date: 2000-09-19
Classification: F16B,Y10T

Abstract:
Lamina-shaped borepiece for self-boring fastening elements, the borepiece including a first frontmost cutting edge and a second frontmost cutting edge which together enclose an angle of less than 180.degree., and with a groove on each opposing side of said lamina borepiece, each of said grooves running adjacent and parallel to a respective one of said first and said second frontmost cutting edges when viewed in the drilling direction, wherein a front edge of each groove is defined by a respective frontmost cutting edge and a rear edge of each groove is defined by a single linear edge parallel and spaced apart from said respective frontmost cutting edge, wherein a first indent and a second indent each with a set-back cutting edge is provided, in each instance, in the region of both frontmost cutting edges with a first delimitation of these indents being defined by a surface aligned parallel to the longitudinal center axis of the borepiece, in each instance, and a second delimitation, having a surface with an edge which forms the set-back cutting edge and perpendicular to the longitudinal center axis, and that the indents are formed within the region of the axial extension of the grooves.