F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/107
F16B 25/00 (2006.01)
Patent
CA 1166877
A B S T R A C T Disclosed is a drill screw for fastening a structural member on a harder supporting member. comprising a head and a shank joining the head and having a self-cutting machined thread which is flattened with decreasing depth of thread and decreasing outer diameter in a drilling section followed by the tapered drill bit. The axial length of the drilling section is approximately equal to the thickness of the structural member to be fastened. The axial position and length of a thread principal portion is disposed nearer to the head and formed with full depth of thread and full outer diameter being dimensioned such that with the drill screw in its condition of being fully threaded in the supporting member is threadedly connected to the thread principal portion. Two dia- metrically opposed chip grooves are furthermore provided in the drilling section and the drill bit, the grooves having an approximately rectangular base cross sectional area. A transverse cutting edge extends at the free end of the drill bit between the chip grooves. The chip groove areas are disposed to the rear when looking in the direction of threading-in of the screw furthermore forming cutting edges with the portions of the drilling section that were left untouched between the chip grooves, and the drill bit, and with the conical basic shape of the drill bit being furthermore preferably modified by the flats extending from the transverse cutting edge. The screw is particularly characterized in that in each chip groove the bottom is filled by a flute, the outer surface of which forms a transverse surface extending between the groove side walls and forming two inner edges with them. The transverse cutting edge extends between the inner edges disposed to the rear in the direction of threading-in of the screw.
378803
Itw-Ateco G.m.b.h.
Meredith & Finlayson
LandOfFree
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