Self-drilling screw

Details Self-drilling screw Self-drilling screw

1981-09-22

1984-11-06

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408213, 408228, 411387, F16B 2500

Patent

active

044809514

ABSTRACT:
A self-drilling screw includes an axially extending screw shank with a leading end and a trailing end. A drill bit is secured to and extends axially outwardly from the leading end of the screw shank. At least one wing extends laterally outwardly from the drill bit transversely of the axial direction of the screw shank and spaced from the cutting edge at the leading end of the drill bit. The wing has a cutting edge facing toward the leading end of the drill bit. The wing extends outwardly beyond the outside diameter of the screw shank and forms an enlarged bore through which the shank can pass without contact with the surface of the larger bore. Each wing has a break-off groove or notch so that it can separate from the drill bit.

REFERENCES:
patent: 2621548 (1952-12-01), Williams
patent: 2732869 (1956-01-01), Stearns
patent: 3699841 (1972-10-01), Lanius, Jr.
patent: 3869219 (1975-03-01), Wilson et al.
patent: 3916757 (1975-11-01), Wilson
patent: 3997279 (1976-12-01), Porter
patent: 4028987 (1977-06-01), Wilson
patent: 4257307 (1981-03-01), Regensburger
patent: 4347027 (1982-08-01), Brindle

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