Self-drilling screw

Details Self-drilling screw Self-drilling screw

1979-06-25

1982-04-06

Britts, Ramon S.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

411311, 411416, F16B 2500

Patent

active

043233260

ABSTRACT:
A self-drilling screw having a single screw thread or a plurality of screw threads of the same angle and height, wherein at least one cutting edge of a drill shape is formed by form rolling at an end face of a forward end of the screw thread at a tapering forward end portion of the self-drilling screw, the cutting edge having a lead angle distinct from that of other portions of the self-drilling screw. The self-drilling screw is formed at the root of the screw thread with elevated areas and depressed areas or major diameter areas and minor diameter areas of polygonal configuration in a zone of a shank extending across the boundary between a parallel portion and a tapering portion to reduce the transverse cross sectional area of the screw thread.

REFERENCES:
patent: 1336773 (1920-04-01), Caldwell
patent: 1651796 (1927-12-01), Arenz
patent: 2314391 (1943-03-01), De Vellier
patent: 2959086 (1960-11-01), Gerlach et al.
patent: 3233500 (1966-02-01), De Vellier
patent: 3246556 (1966-04-01), Phipard, Jr.
patent: 3426642 (1969-02-01), Phipard, Jr.
patent: 3861269 (1975-01-01), Laverty
patent: 3942405 (1976-03-01), Wagner
patent: 4027573 (1977-06-01), Laverty

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