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
1995-02-28
1997-02-04
Wilson, Neill R.
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
411420, 411426, F16B 2500, F16B 3504
Patent
active
055991491
ABSTRACT:
A self-tapping screw fastener includes a shank having first and second ends and a head disposed at the second end of the shank. The shank has a tapered portion of a predetermined axial length adjacent the first end, and the tapered portion terminates at the first end in a substantially circular end surface having a first diameter. The shank also has a substantially cylindrical portion having a second diameter extending from the second end to the tapered portion. A thread extends helically along a circumferential outer surface of the shank from a location near the head substantially to the first end such that the thread at least partially covers the cylindrical and tapered portions of the shank. The ratio of the axial length of the tapered portion to the diameter of the end surface exceeds substantially 1.5, and the diameter of the end surface is less than but substantially equal to the diameter of the cylindrical portion of the shank.
REFERENCES:
patent: 2165011 (1939-07-01), Rosenberg
patent: 2232337 (1941-02-01), Meersteiner
patent: 2278411 (1942-04-01), Braendel
patent: 2293930 (1942-08-01), Braendel
patent: 2823574 (1958-02-01), Rosan
Anchor Bolt and Screw Company drawing dated Jan. 14, 1982, Drawing No. ABM 5307, 1 sheet.
Anchor Bolt and Screw Company
Wilson Neill R.
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