Method of manufacturing a drill screw

Details Method of manufacturing a drill screw Method of manufacturing a drill screw

1983-07-14

1985-08-06

Combs, E. Michael

B23G 900, B21K 156

Patent

active

045326630

ABSTRACT:
A drill screw having protective burrs on the cutting edges. These burrs preserve the sharpness of the cutting edges against heavy plating buildup which can have detrimental effects on performance. Further, whereas conventional burrs on the drag surfaces can be reinforced and serve to thicken the dimension of the point across the chisel, the burrs of the present invention are formed on the cutting edge in such a way that they are spaced from the chisel. Drilling can, therefore, begin immediately and continued penetration of the workpiece pushes the burrs into the material being drilled causing them to break off.

REFERENCES:
patent: 3738218 (1973-06-01), Gutshall
patent: 3780389 (1973-12-01), Lindstrom
patent: 3933075 (1976-01-01), Peterson
patent: 4138754 (1979-02-01), Baer

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