Anti-stripping sheet metal screw

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...

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Details

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

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