The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1986
Filed:
Apr. 24, 1985
Applicant:
Inventor:
Henry A Sygnator, Arlington Heights, IL (US);
Assignee:
Illinois Tool Works Inc., Chicago, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B23G / ; B21K / ;
U.S. Cl.
CPC ...
10 1 / ;
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.