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US 4,067,362 AGranted
Reinforced ribbed tubular structure and method of making same
AssigneeA. O. Smith-Inland, Inc.
InventorRobert M. Jackman
Life of this patent
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AssigneeA. O. Smith-Inland, Inc.
InventorRobert M. Jackman
Estimating the term…
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.
A ribbed tubular structure having an outer surface and reinforcing members secured to said outer surface and forming substantially encircling ribs, said reinforcing members including a series of resin impregnated filaments arranged in an elongated bundle and surrounded by a plurality of filaments helically formed from separate axially spaced filaments separately wound and secured to the bundle and providing a plurality of spaced adjacent convolutions surrounding said elongated resin impregnated filaments.
A ribbed tubular structure, comprising a tubular member of resin impregnated fibrous material forming a pipe of predetermined length having an inner substantially cylindrical surface providing an opening for the passage of matter and an outer substantially cylindrical surface, and a helical reinforcing member bonded to said outer surface substantially over said predetermined length with adjacent convolutions spaced with respect to each other, said reinforcing member including a filament-wound composite of a series of substantially continuous resin impregnated glass filaments arranged in a bundle and surrounded by a helical fiber having spaced adjacent convolutions and providing a reinforcing rib of substantial thickness having a substantially semi-circular outer surface in a collapse resistant and essentially rigid ribbed tubular structure which will flex and distort during handling and placement.
Dependencies are inferred from the claim text.