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
1993-11-29
1995-01-31
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
411311, 411416, F16B 2500, F16B 3930
Patent
active
053854390
ABSTRACT:
A radial extrusion thread-forming screw (20) comprises a lead thread (36), load-bearing threads (34), and a forming thread (38). The forming thread (38) has a plurality of forming elements (50) that extend outwardly from the forming thread and which are spaced substantially circumferentially equidistant from each other. The forming thread (38) is tapered about its circumference such that the first forming element (50) moves the greatest amount of material and subsequent forming elements (50) move successively less such that each of the forming elements require substantially the same deformation force to move through the workpiece. The forming elements (50) are of a geometry which promotes deformation along slip planes in the material of the workpiece. The lead thread (36) and the load-bearing threads (34) do not have any forming elements (50) located thereon.
REFERENCES:
patent: 3426642 (1969-02-01), Phipard, Jr.
patent: 3527136 (1970-09-01), Wilson
patent: 3831415 (1974-07-01), Skierski
patent: 3935785 (1976-02-01), Lathom
patent: 4040328 (1977-08-01), Muenchinger
patent: 4194430 (1980-03-01), Muenchinger
patent: 4259989 (1981-04-01), Capuano
patent: 5088869 (1992-02-01), Greenslade
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