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
1986-11-24
1988-06-07
Gall, Lloyd A.
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
411533, F16B 2500, F16B 4300
Patent
active
047493224
ABSTRACT:
A threaded fastener unit comprising a preassembled fastener for use in association with thin metal panels having a head with a clamping surface thereunder, a shank and a drill point, said shank having an upper unthreaded shank portion, a lower threaded shank portion with an annular shoulder therebetween and a washer, said threaded shank portion having a plurality of helical thread convolutions for forming complementary threads and extruding a portion of a panel, and said shoulder being adapted to deform the extruded panel portion for gripping the screw and resisting retrograde rotation of the screw.
REFERENCES:
patent: 1251676 (1918-01-01), McCaffray
patent: 3661046 (1972-05-01), Waud et al.
patent: 3993397 (1976-11-01), Gutshall
patent: 4235147 (1980-11-01), Weidner
patent: 4292007 (1981-09-01), Wagner
patent: 4312616 (1982-01-01), Waller et al.
patent: 4435112 (1984-03-01), Becker
patent: 4589809 (1986-05-01), Moore et al.
patent: 4615655 (1986-10-01), Dixon
Buckman Thomas W.
Gall Lloyd A.
Illinois Tool Works Inc.
Roche David I.
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