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
Reexamination Certificate
2008-05-27
2008-05-27
Saether, Flemming (Department: 3677)
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
Reexamination Certificate
active
11511638
ABSTRACT:
A self-tapping screw includes a head, a shaft, a tapered end and a rounded distal tip. A thread includes a thread start on the tapered end. The axial position of the thread start and a first full thread, the radius of the round distal tip and the diameter of the tapered end at the thread start are controlled in relation to the screw size for consistent, improved screw performance.
REFERENCES:
patent: 413968 (1889-10-01), Rogers
patent: 449887 (1891-04-01), Rogers
patent: 1827615 (1931-10-01), Heyman
patent: 3438299 (1969-04-01), Gutshall
patent: 3942405 (1976-03-01), Wagner
patent: 5234301 (1993-08-01), Grossberndt et al.
patent: 5294227 (1994-03-01), Forster et al.
Bechtel, Jr. Frank W.
Day Timothy L.
Downey Joseph F.
Glynn Michael P.
Croll Mark W.
Donovan Paul F.
Illinois Tool Works Inc.
Saether Flemming
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