Self-drilling screws

Details Self-drilling screws Self-drilling screws

1975-12-05

1977-06-14

Frazier, Roy D.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

85 47, 408224, F16B 2500

Patent

active

040289877

ABSTRACT:
A self-drilling thread-forming screw having a first portion which is screw-threaded and adapted to form a screw-thread in the material within which the screw is to be engaged, a head at one end of the first portion, and at the other end of the first portion a second portion of generally smaller cross-sectional size than the first portion and having a drill point at the entering end thereof, and a pair of diametrally opposed wings outstanding from the second portion and each tapering inwardly towards the first portion from a front cutting edge.

REFERENCES:
patent: 1408793 (1922-03-01), Anderson et al.
patent: 1418485 (1922-06-01), Smith
patent: 2388482 (1945-11-01), Haynes
patent: 2543206 (1951-02-01), Smith
patent: 3125923 (1964-03-01), Hanneman
patent: 3195156 (1965-07-01), Phipard
patent: 3241426 (1966-03-01), Gutshall
patent: 3318182 (1967-05-01), Carlson
patent: 3395603 (1968-08-01), Skierski
patent: 3578762 (1971-05-01), Siebol et al.
patent: 3827331 (1974-08-01), Muenchinger

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