Self-tapping screw

Details Self-tapping screw Self-tapping screw

1997-09-24

1999-01-26

Wilson, Neil

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

411418, 411420, F16B 2500, F16B 3504

Patent

active

058631658

ABSTRACT:
A self-tapping screw has a thread shaft having a leading end, a wood screw thread provided on the thread shaft and having a plurality of turns, and milling profiles formed on the turns of the wood screw thread and spaced from one another in an axial direction, the milling profiles becoming smaller the further away the milling profiles are from the leading end, some thread turns at a head end of the thread shaft being free of milling profiles.

REFERENCES:
patent: 924273 (1909-06-01), Rehse
patent: 1088892 (1914-04-01), Foreman
patent: 1933332 (1933-10-01), May
patent: 2200227 (1940-05-01), Olson
patent: 3176746 (1965-04-01), Walton
patent: 3390410 (1968-07-01), Bridges
patent: 3942406 (1976-03-01), Egner
patent: 4973209 (1990-11-01), Essom et al.
patent: 5044853 (1991-09-01), Dicke

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