Self-drilling fastener and method of making same

Details Self-drilling fastener and method of making same Self-drilling fastener and method of making same

1974-11-08

1976-01-20

Parsons, Jr., Marion

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

10 10R, 408230, F16B 2500

Patent

active

039330753

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.

REFERENCES:
patent: 2136458 (1938-11-01), Olson
patent: 3238836 (1966-03-01), Johnson
patent: 3318182 (1967-05-01), Carlson
patent: 3507183 (1970-04-01), Thurston
patent: 3738218 (1973-06-01), Gutshall
patent: 3779664 (1973-12-01), Caley et al.
patent: 3789725 (1974-02-01), Lindstrom

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