Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1991-08-01
1992-03-31
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
411371, 411531, F16B 3300
Patent
active
051002744
ABSTRACT:
A composite fastener comprised of a roofing screw and a roofing washer. The screw shank has a leading portion, which is threaded, and a locking portion. The locking portion has a substantially frusto-conical part adjoining the leading portion and an additional part adjoining the screw head. The substantially frusto-conical part defines a major diameter where it adjoins the additional part and a minor diameter where it adjoins the leading portion. Two locking tabs extend from the substantially frusto-conical part, in diametric opposition to each other, in such manner that an imaginary cylinder coaxial with the shank and with a diameter equal to the major diameter divides each tab into a proximal part inside the cylinder and a distal part outside the cylinder. The washer has an aperture with a margin that flexes the tabs to allow the tabs to pass through the aperture.
REFERENCES:
patent: 74489 (1868-02-01), Bidwell
patent: 3357064 (1967-12-01), Munse
patent: 3782437 (1974-01-01), Seckerson
patent: 4642012 (1987-02-01), Blucher et al.
patent: 4763456 (1988-08-01), Gianuzzi
patent: 4856951 (1989-08-01), Blucher et al.
patent: 4881861 (1989-11-01), Hewison
patent: 4892429 (1990-01-01), Giannuzzi
Ditka Michael P.
Hasan Syed R.
Buckman Thomas W.
Illinois Tool Works Inc.
Johnson Neal C.
Lindsey Rodney M.
O'Brien John
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