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
1987-01-27
1988-11-01
Wilson, Neill R.
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
411353, 411533, 411544, 52410, F16B 3300, F16B 4300
Patent
active
047815035
ABSTRACT:
A fastener assembly for securing roofing on soft insulation material to a solid base is formed of an axially elongated screw and a large surface washer. The screw has an elongated shank with a cutting tip at one end and a screw head at the other. A self-cutting thread is formed on the shank. The shank has a thread-free section extending from the screw head. The thread-free section has a diameter not greater than the diameter of the opening in the washer into which the screw is inserted. The washer has a countersunk area around the screw opening to receive the screw head in a recessed manner. The shank of the screw, at a spaced distance from the screw head and in the axially extending region of the thread-free section has a stop or similar member which forms a support for the washer. With the assembly secured to the solid base, the washer is tiltable relative to the screw. Accordingly, the fastener assembly can be stepped on without any damaging transfer of stress from the washer to the screw.
REFERENCES:
patent: 2922456 (1960-01-01), Kann
patent: 3118718 (1964-01-01), Babey
patent: 3221588 (1965-12-01), Wieber
patent: 3415064 (1968-12-01), Talobre
patent: 4095430 (1978-06-01), Hannan
patent: 4157725 (1979-06-01), Stanaitis
patent: 4380413 (1983-04-01), Dewey
patent: 4462730 (1984-07-01), Knohl
patent: 4545270 (1985-10-01), Dewey
patent: 4630984 (1986-12-01), Reinwall et al.
SFS Stadler AG
Wilson Neill R.
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