Roofing fastener and improved screw therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 31, 1992
Issued Date -
N/A
app pub date -
Aug 1, 1991
filing date -
Oct 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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