Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc.
Patent
1995-02-15
1996-10-15
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
411480, 411487, 411902, 470 34, F16B 1500, F16B 1502
Patent
active
055648762
ABSTRACT:
A corrosion-resistant, headed fastener, such as a nail for exterior applications, is made from a carbon steel wire pre-coated with a protective, metallic layer having corrosion-resistant properties, the protective, metallic layer being discontinuous at a region on a leading end of the pre-coated wire. After at least part of a protective, metallic cap having corrosion-resistant properties is disposed near the leading end of the pre-coated wire, at least part of the protective, metallic cap is welded to the leading end of the pre-coated wire, so as to cover the region where the protective, metallic layer is discontinuous, by impact welding, as the fastener is formed from the precoated wire in such a manner that the fastener is formed with a shank and with a head, which is formed by deformation of the leading end of the pre-coated wire. The welded part of the protective, metallic cap provides the fastener with corrosion resistance at the region where the protective, metallic layer is discontinuous, and the protective, metallic layer provides the remaining portions of the fastener with corrosion resistance. The protective, metallic layer is made from chromium, nickel, zinc, aluminum, or an alloy comprising zinc and aluminum, preferably from zinc or such an alloy. The protective, metallic cap is made from chromium, nickel, zinc, aluminum, or an alloy comprising zinc and aluminum, preferably aluminum, which can be visually differentiated from zinc or such an alloy.
REFERENCES:
patent: 2718647 (1955-09-01), Raible
patent: 3983304 (1976-09-01), Sekhon
patent: 4802807 (1989-02-01), Offenburger et al.
patent: 5178903 (1993-01-01), Lat et al.
Illinois Tool Works Inc.
Wilson Neill R.
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