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
1990-09-10
1991-11-12
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
411417, F16B 2500
Patent
active
050643274
ABSTRACT:
A blank and fastener formed from the blank for a thread-forming fastener which provides axially aligned driving. A tip portion of the blank is formed in a conical shape at an oblique angle to the shank portion of the blank. The blank formed as such is then formed with threads, however, the tip portion is formed with threads only about a portion of its outer surface. The resulting threaded fastener forms threads on an inside surface of a pilot hole in a workpiece in which it is inserted. The threaded fastener so formed minimizes driving effort and maintains proper alignment when the fastener is initially inserted and driven into an unthreaded pilot hole in a workpiece and also prevents cross-threading when the fastener is removed and reinserted into the workpiece.
REFERENCES:
patent: 3438299 (1969-04-01), Gutshall
patent: 3724315 (1973-04-01), Sygnator
patent: 4042342 (1977-08-01), Muenchinger
patent: 4789288 (1988-12-01), Peterson
patent: 4915560 (1990-04-01), Peterson et al.
patent: 4952110 (1990-08-01), Avgoustis et al.
Research Engineeering & Manufacturing, Inc.
Wilson Neill R.
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