Pipes and tubular conduits – Spirally seamed
Patent
1993-10-21
1994-07-19
Simone, Timothy F.
Pipes and tubular conduits
Spirally seamed
138122, 138129, 138150, F16L 916
Patent
active
053299736
ABSTRACT:
A rigid polyvinyl chloride pipe comprises a strip member A that comprises a rigid polyvinyl chloride strip 1 with a U-shaped cross section consisting of an intermediate portion 1a of a predetermined width having a generally flat surface on at least one lateral side and two ribs 1b that extend from opposite sides of the intermediate portion 1a in a generally perpendicular direction with respect to the intermediate portion, with a layer of flexible synthetic resin 2 highly fusible to the rigid polyvinyl chloride resin being fused integrally to substantially the entire outer surface of the lateral side of both ribs 1b. The strip member A is wound spirally to be positioned in such a way that the U-shaped concave portion 3 of the rigid strip 1 is open radially outward and that the flexible synthetic resin layer 2 is interposed between the mating surfaces of two adjacent ribs 1b so that the ribs 1b are fused together by means of the flexible synthetic resin layer 2 in such a way that the width (w) of the flexible synthetic resin layer 2 is generally equal to or smaller than the width (W) of the ribs 1b as they are joined together.
REFERENCES:
patent: 1294465 (1919-02-01), Horvath
patent: 3273600 (1966-09-01), Swan
patent: 3280851 (1966-10-01), Habdas
patent: 3340901 (1967-09-01), Lombardi
patent: 3926223 (1975-12-01), Petzetakis
patent: 4121624 (1978-10-01), Chen
patent: 4383555 (1983-05-01), Finley
patent: 4928735 (1990-05-01), Richards
Simone Timothy F.
Till Terrence R.
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