Patent ID: 8444360
Filing Date: 2013-05-21
Classification: F16B,Y10T

Abstract:
1. A self-drilling screw ( 10 ), comprising a shaft ( 11 ) defining a longitudinal axis (L) of the screw ( 10 ) and carrying, at least in some regions thereof, a thread ( 13 ); a head ( 15 ) provided at one end of the shaft ( 11 ); and a drilling tip ( 12 ) provided at another, opposite end of the shaft ( 11 ) and having a diameter (D), the drilling tip ( 12 ) having at least one first cutting edge ( 21 ), at least one second cutting edge ( 22 ), a first chip channel ( 24 ) associated with the at least one first cutting edge ( 21 ), beginning at a first start point ( 26 ) at a free end ( 14 ) of the drilling tip ( 12 ), and located on a first side of the drilling tip ( 12 ), and a second chip channel ( 25 ) associated with the at least one second cutting edge ( 22 ), beginning at a second start point ( 27 ) at the free end ( 14 ) of the drilling tip ( 12 ), and located on a second side of the drilling tip ( 12 ) opposite the first side, and the drilling tip ( 12 ) having a center (Z) located on the longitudinal axis (L) of the screw ( 10 ), the first start point ( 26 ) being spaced by a first distance from the center (Z) of the drilling tip ( 12 ) and the second start point ( 27 ) being spaced by a second distance from the center (Z) of the drilling tip ( 12 ) different from the first distance and on the same side of the center, with the mean value (X) of the first distance and the second distance being equal to from 0.01 to 0.15 of the diameter (D) of the drilling tip ( 12 ), and a distance (Y) between the first and second start points ( 26 , 27 ) being equal at most to 0.12 of the diameter of the drilling tip.