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
1990-10-29
1992-08-18
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
051393794
ABSTRACT:
An improved composite fastener comprised of an improved roofing screw and a roofing washer and useful to fasten a blanket of roofing insulation to a soft substrate. The screw shank has a leading portion and a locking portion. The locking portion has two locking tabs. The washer has an aperture with a margin coacting with the screw when it is driven through the washer. The screw becomes locked to such washer when the screw is driven sufficiently for its head to bear against the washer at which time the locking tabs engage the undersurface of the washer.
REFERENCES:
patent: 1406423 (1922-02-01), Smith
patent: 3357064 (1967-12-01), Munse
patent: 3782437 (1974-01-01), Seckerson
patent: 4763456 (1988-08-01), Giannuzzi
patent: 4881861 (1989-11-01), Hewison
Beach John R.
Hasan Syed R.
Hindman Craig A.
Rathgeber Juergen O.
Santi Ernest S.
Illinois Tool Works Inc.
Lindsey Rodney M.
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