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:
Jan. 20, 1976
Filed:
Nov. 08, 1974
Roy E Peterson, Rockford, IL (US);
Elco Industries, Inc., Rockford, IL (US);
Abstract
A self-drilling fastener includes a shank having a drill tip integrally formed on one end thereof and a head on the other end. The drill tip is defined by two concave grooves formed one on each side of the shank and intersecting with two planar heels formed on the end of the shank to define two cutting edges. Each of the cutting edges is formed with a positive rake angle along the entire length thereof with the rake angle increasing in magnitude upon progressing outwardly along the cutting edge and toward the periphery of the shank. The axes of the grooves are straight and form an acute included angle bisected by the axis of the shank. The heels also intersect at an angle bisected by the axis of the screw, the edge of intersection of the heels defining a chisel edge at the tip of the shank. A peripheral edge is formed where each heel intersects with the surface of the shank, and the grooves intersect the peripheral edges at points not beyond the points of maximum progression of the peripheral edges toward the other end of the shank.