Synthetic resin pipe for underground use

Details Synthetic resin pipe for underground use Synthetic resin pipe for underground use

1985-01-30

1986-12-16

Bryant, III, James E.

Pipes and tubular conduits

Flexible

Corrugated

138121, 138105, 138133, 138173, 138174, 138129, F16L 1108

Patent

active

046289666

ABSTRACT:
A pipe made of a synthetic resin and suitable for underground use which has an improved strength and reliability. In a first embodiment, a helical reinforcing rib is provided by extruding together with a band of resin material which forms the main body of the pipe a corrugated tube. By passing the corrugated tube through the extrusion die, the danger of the wall thickness of the main body of the pipe being reduced is eliminated. In a second embodiment, the reinforcing rib is formed by helically winding a reinforcing member having at least an outer coating of either the same material which forms the main body of a straight-wall pipe or a material having a high fusibility therewith. In this case also, the reinforcing rib can be made from a corrugated tube having a semicircular cross-section.

REFERENCES:
patent: 3047026 (1962-07-01), Kahn
patent: 3495628 (1970-02-01), Boender
patent: 4140154 (1979-02-01), Kanao
patent: 4291728 (1981-09-01), Cothran
patent: 4304266 (1981-12-01), Kutnyak et al.
patent: 4350547 (1982-09-01), Kanao
patent: 4510004 (1985-04-01), Hawerkamp

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