Self-drilling screw
AssigneeSFS Stadler AG
InventorWerner Regensburger
Life of this patent
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Abstract
A self-drilling screw includes an axially extending screw shank with a leading end and a trailing end. A drill bit is secured to and extends axially outwardly from the leading end of the screw shank. At least one wing extends laterally outwardly from the drill bit transversely of the axial direction of the screw shank and spaced from the cutting edge at the leading end of the drill bit. The wing has a cutting edge facing toward the leading end of the drill bit. The wing extends outwardly beyond the outside diameter of the screw shank and forms an enlarged bore through which the shank can pass without contact with the surface of the larger bore. Each wing has a break-off groove or notch so that it can separate from the drill bit.
Claims18
Self-drilling screw comprising an axially extending cylindrically shaped screw shank having a leading end and a trailing end spaced apart in the axial direction thereof, a drill bit formed of a plate-shaped piece of material separate from that of said screw shank and secured to and extending axially outwardly from the leading end of said screw shaft, said drill bit having a leading end arranged to engage and cut the surface to be drilled and a trailing end spaced in the axial direction of said screw shank from the leading end of said drill bit and secured to the leading end of said screw shank, said drill bit having at least one wing spaced axially from the leading end thereof and extending laterally outwardly therefrom transversely of the axial direction of and projecting outwardly beyond the outside diameter of said screw shaft, and said wing having a cutting edge thereon facing toward the leading end of said drill bit and extending transversely of the axial direction of said screw shank.
Dependencies are inferred from the claim text.