Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Patent
1986-11-19
1988-06-07
Gall, Lloyd A.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
411311, 411399, 411412, F16B 502, F16B 3930
Patent
active
047493194
ABSTRACT:
A sheet metal screw is disclosed having an enlargement in the form of a helical ramp on the shank adjacent the head, which ramp extends for only about 180 degrees for providing an interfering fit with a workpiece to obtain an anti-stripping action while permitting the screw to provide an effective clamping action.
REFERENCES:
patent: D31749 (1899-10-01), North
patent: 1238636 (1917-08-01), Christofferson
patent: 1953305 (1934-04-01), MacLean
patent: 2037586 (1936-04-01), Olson
patent: 2096040 (1937-10-01), Hosking
patent: 2169408 (1939-08-01), De Vellier
patent: 3812639 (1974-05-01), Sygnator
patent: 4490082 (1984-12-01), Barth
patent: 4516893 (1985-05-01), Barth
patent: 4518294 (1985-05-01), Barth
Buckman T. W.
Gall Lloyd A.
Illinois Tool Works Inc.
Roche D. I.
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