Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Impact driven fastener – e.g. – nail – spike – tack – etc. – Including integral locking means
Patent
1979-01-09
1981-06-09
Bilinsky, Z. R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Impact driven fastener, e.g., nail, spike, tack, etc.
Including integral locking means
10140, 411387, 408 26, 408220, B23G 506
Patent
active
042715547
ABSTRACT:
An elongated rectilinear tool for formation of a threaded hole in ductile metal by the coining or flowing of the metal. The tool typically is employed to form through threaded holes in a piece of ductile metal, and features a working end having a boring tip or drill point and a spade section having a flat shank with grooves in its lateral edges. The spade section holds the drill point and extends back a short distance from the working end. The diameter of the tool then enlarges slightly at a small inclined section which is followed by a longer coining tap section. The coining (flowing) of metal forms a thread on the previously smooth wall of the drilled hole, with peaks or crests, and roots. The lateral grooving of the spade section tracks, i.e. fits, into the fully formed threading as the present tool is screwed out. If the lateral grooves or notches for the spade section were not provided, then during removal of the tool from the threaded hole, the spade section of the drill portion would shear away the crests of the threads.
REFERENCES:
patent: 2654284 (1953-10-01), Schevenell
patent: 2684492 (1954-07-01), Miner et al.
patent: 2705419 (1955-03-01), Barth
patent: 3258797 (1966-07-01), Budd
patent: 3429171 (1969-02-01), Feher
patent: 3507183 (1970-04-01), Thurston
Allen-Stevens Corp.
Bilinsky Z. R.
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