Self-drilling screw

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation

Patent

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Details

4113871, F16B 2500

Patent

active

061427195

ABSTRACT:
A self-drilling screw including a drilling section (1; 4) adjoining a thread section (2; 5) of the screw and formed of first (11; 41) and second (12; 42) parts arranged one after another, within the drilling section (1; 4) having first and second cutting edges (15, 16; 45, 46) a radial extension of which is symmetrical with respect to the longitudinal axis of the screw, in the first, in a drilling direction, part of the drilling section (1; 4), with at least a portion of the second part (12, 42) of the drilling section (1, 4), which is located between the first part (11, 41) and the thread section (2; 5), having in a region of one of the first cutting edges (15; 45), a radial extension (R1; R3) corresponding, at most, to a half of a root diameter (D1; D3) of the thread section (2; 5), and with the second cutting edge (16, 46) having in the second part (12, 42) of the drilling section (1, 4), a radial extension (R2; R4) which is smaller than a half of a pitch diameter (D2; D4) of the thread section (2, 5) and corresponds at least to the half of the root diameter (D1; D3) of the thread section (2; 5).

REFERENCES:
patent: 3395603 (1968-08-01), Skierski
patent: 3517581 (1970-06-01), Stokes
patent: 3578762 (1971-05-01), Siebol
patent: 3665801 (1972-05-01), Gutshall
patent: 4028987 (1977-06-01), Wilson
patent: 4125050 (1978-11-01), Schwartzman
patent: 4222689 (1980-09-01), Fujiwara
patent: 4407620 (1983-10-01), Shinjo
patent: 4586862 (1986-05-01), Yamasaki
patent: 4645396 (1987-02-01), McCauley et al.
patent: 5120172 (1992-06-01), Wakai

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