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    • 6. 发明专利
    • Lamina-shaped borepiece for self-boring fastening elements
    • CZ289542B6
    • 2002-02-13
    • CZ244896
    • 1995-02-13
    • SFS IND HOLDING AG
    • PALM ERICH
    • F16B13/13F16B19/08F16B19/10F16B25/10
    • The present invention relates to a lamina-shaped borepiece (4) for self-boring fastening elements, such as rivets, screws, dowels and the like. The borepiece includes two cutting edges (5, 6), which together enclose an angle of less than 180 degrees, and with a groove on each opposing side of said lamina borepiece, each of said grooves (7, 8) running adjacent and substantially parallel to said cutting edges (5, 6) when viewed in the drilling direction, wherein a front edge of each groove (5, 6) is defined by a respective foremost cutting edge and a rear edge of each groove is defined by a single linear edge parallel and spaced apart from said respective foremost cutting edge, wherein a first indent (9) and a second indent (10) each with a set-back cutting edge (11, 12) is provided, in each instance, in the region of both foremost cutting edges with a first delimitation of these indents (9, 10) being defined by a surface aligned parallel to the longitudinal center axis (15) of the borepiece (4), in each instance, and a second delimitation, having a surface with an edge which forms the set-back cutting edge (13, 14) and perpendicular to the longitudinal center axis, and that the indents (9, 10) are formed within the region of the grooves (7, 8).