Roofing fastener, improved screw therefor, and improved washer therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 18, 1992
Grant Date -
N/A
app pub date -
Oct 29, 1990
filing date -
Oct 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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International Classification(s)
Cited Art Landscape
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