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
1988-05-13
1990-06-05
Wilson, Neill R.
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...
411908, 411959, 439535, 439650, F16B 39282, H02G 308
Patent
active
049309609
ABSTRACT:
A mounting screw for mounting an electrical wiring device having non-metallic components, to an electrical outlet box and combination of root electrical wiring device and screw. The screw includes a head and a shank, with a lip projecting downwardly from the bottom surface of the screw head spaced from and encircling the shank, and a series of ribs extending radially outward between the shank and the lip. Advantageously the mounting screw is in combination with an electrical wiring device having non-metallic mounting straps so that when the screw is installed by a power tool, the lip-and-ribs arrangement on the screw bites into the mounting strap material to produce resistance to the turning of the power tool signaling the operator that the screw is secure.
REFERENCES:
patent: 2800829 (1957-07-01), West
patent: 3269250 (1966-08-01), Curtiss
patent: 3526703 (1970-09-01), Tucker
patent: 3825051 (1974-07-01), Sigmund
patent: 4223711 (1980-09-01), Tabor
patent: 4518294 (1985-05-01), Barth
patent: 4764066 (1988-08-01), Terrell et al.
AKKO Catalog Sheet for Flanged Head Fasteners: Eskay Catalog Sheet for ES-Grip Low Torque, Heavy Duty Tapping Screw for Light Gauge Metals and ES Drill Sheet Metal Screws, ES-Dril #1 and ES Dril #2.
Maclean-Fog Catalog Sheet for Flanged Head Fasteners. Excerpt (p. 78), from Machine Design, 11/19/87.
Excerpt (p. 57), from Fastening, Joining and Assembly Components Reference Issue.
Slater Electric Inc.
Wilson Neill R.
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