Drill screw with protective burrs

Details Drill screw with protective burrs Drill screw with protective burrs

1981-06-30

1983-07-26

Shedd, Wayne L.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

411421, 408230, F16B 2500

Patent

active

043951732

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: 3125923 (1964-03-01), Hanneman
patent: 3738218 (1973-06-01), Gutshall

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