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1. (WO2017032423) DRILLING SCREW

Pub. No.:    WO/2017/032423    International Application No.:    PCT/EP2015/069658
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Fri Aug 28 01:59:59 CEST 2015
IPC: F16B 25/00
F16B 25/10
Applicants: EJOT BAUBEFESTIGUNGEN GMBH
Inventors: KETTNER, Tobias
Title: DRILLING SCREW
Abstract:
The invention relates to a drilling screw, in particular a two-steel screw, comprising a head part and a cutting part, wherein the head part is produced of a corrosion-resistant material and has a screw head and a shaft segment and wherein the cutting part is produced of a hardenable or hard material, wherein an intermediate segment composed of a corrosion-resistant material is arranged between the shaft segment and the cutting part and is welded to the shaft segment, wherein the cutting part has a stud-like protrusion or a cup-like cut-out and wherein the intermediate segment has a cup-like cut-out or a stud-like protrusion, wherein the cup-like cut-out or the stud-like protrusion has, in the cross-section thereof, a driving profile having plurality of driving segments, wherein the stud-like protrusion is arranged in the cup-like cut-out and wherein the intermediate segment is permanently connected to the cutting part by means of extrusion in such a way that the stud-like protrusion of the cutting part axially undercuts the the intermediate segment in the region of the cup-like cut-out at least in some segments or that the stud-like protrusion of the intermediate segment axial undercuts the cutting part in the region of the cup-like cut-out at least in some segments.