Pipes and tubular conduits – Reinforced – Corrugated
Patent
1976-02-02
1978-01-10
Artis, Henry K.
Pipes and tubular conduits
Reinforced
Corrugated
138121, 138153, F16L 914
Patent
active
040673626
ABSTRACT:
A pipe made of fiberglass or the like includes a helical reinforcing member bonded to its outer surface substantially over its length with adjacent convolutions spaced with respect to each other. The reinforcing member or rib includes a filament-wound composite of a series of continuous resin impregnated glass filaments arranged in a bundle and surrounded by a helical fiber having spaced adjacent convolutions. An alternative construction further includes a core of paper or plastic or metal within the bundle to increase the rib height. An auxiliary bundle forming apparatus is employed with a filament winding machine so that the same winding machine and additional lengths of continuous glass fibers drawn from a common storage station may be utilized to form both the fiberglass pipe and the reinforcing rib. A spiral guide may also be used with the auxiliary bundle forming apparatus and the filament winding machine to add an inexpensive elongated core to the bundle forming a reinforcing rib of increased height.
REFERENCES:
patent: B530263 (1976-03-01), Gilbu
patent: 2151307 (1939-03-01), Smith
patent: 3063303 (1962-11-01), Cadwallader
patent: 3168910 (1965-02-01), Galloway et al.
patent: 3483896 (1969-12-01), Grosh
patent: 3498038 (1970-03-01), Shulver
patent: 3644866 (1972-02-01), Dearduriff
patent: 3726321 (1973-04-01), Phillips et al.
patent: 3991550 (1976-11-01), Cohen
A. O. Smith-Inland, Inc.
Artis Henry K.
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