Fastener assembly for a roof membrane
AssigneeElco Industries, Inc.
InventorsErnest W. Reinwall, Robert A. Hagan
Life of this patent
Estimating the term…
Abstract
An assembly for fastening a flexible membrane to a layer of insulation on a roof deck includes a plastic disc and a threaded screw which, when tightened, clamps the disc to the membrane. Angularly spaced pins are formed integrally with and depend from the underside of the disc and bite into the membrane to help prevent edgewise tearing of the membrane when wind uplift forces are exerted on the membrane. The pins preferably are formed between the ends of radially extending and angularly spaced ribs which depend from the underside of the disc to resist upward flexing of the disc.
Claims10
An assembly for fastening a flexible roof membrane to an underlying structure comprising an upper layer of insulation and a lower roof deck, said assembly comprising a disc made of plastic and having upper and lower sides, a tubular hub depending from the lower side of said disc near the center thereof and shaped to penetrate said membrane and said insulation, a screw extending through said hub and adapted to be threaded through said insulation and into said deck, said screw having a head engageable with said disc and operable to clamp said disc downwardly against said membrane when said screw is tightened, a plurality of angularly spaced and radially extending ribs depending from the lower side of said disc to reinforce the disc against upward flexing, said disc being characterized by the provision of a plurality of cleats spaced angularly around said hub and projecting axially from the lower side of said disc to a depth below the lower surfaces of said ribs, said cleats being shaped to bite into said membrane and preventing said membrane from being pulled edgewise from beneath said disc when wind uplift forces are exerted on said membrane.
An assembly for fastening a flexible roof membrane to an underlying structure comprising an upper layer of insulation and a lower roof deck, said assembly comprising a disc made of plastic and having upper and lower sides, a tubular hub depending from the lower side of said disc near the center thereof and shaped to penetrate said membrane and said insulation, a screw extending through said hub and adapted to be threaded through said insulation and into said deck, said screw having a head engageable with said disc and operable to clamp said disc downwardly against said membrane when said screw is tightened, a plurality of angularly spaced and radially extending ribs depending from the lower side of said disc to reinforce the disc against upward flexing, said disc being characterized by a plurality of pins spaced angularly around said hub and alined angularly with said ribs, said pins being located between the ends of said ribs and projecting axially from the lower side of said disc to a depth below the lower surfaces of said ribs, said pins being shaped to penetrate said membrane when said screw is tightened and preventing said membrane from being pulled edgewise from beneath said disc when wind uplift forces are exerted on said membrane.
Dependencies are inferred from the claim text.