Doubled-walled corrugated synthetic resin pipe

Details Doubled-walled corrugated synthetic resin pipe Doubled-walled corrugated synthetic resin pipe

1982-06-21

1984-12-11

Shepperd, John W.

Pipes and tubular conduits

Flexible

Corrugated

138154, 138173, 138150, F16L 1111

Patent

active

044872321

ABSTRACT:
A double-walled corrugated synthetic resin pipe comprises a straight inner pipe, and a corrugated outer pipe surrounding the inner pipe, and joined integrally thereto. The inner pipe is formed by a spirally wound flat strip of a synthetic resin having adjoining turns joined to each other along their adjoining edges, and has a generally even outer surface. The outer pipe is formed by a spirally wound corrugated synthetic resin strip also having adjoining turns thereof joined to each other along their adjoining edges. The outer pipe has a corrugation defined by a ridge portion, a groove portion, and an intermediate portion, and the groove portion has an inner surface joined to the outer surface of the inner pipe.

REFERENCES:
patent: 1287945 (1918-12-01), Ford
patent: 2890723 (1959-06-01), Evert
patent: 2898941 (1959-08-01), Kilcup
patent: 3204666 (1965-09-01), Lindsay et al.
patent: 3330303 (1967-07-01), Fochler
patent: 3477891 (1961-11-01), Hawerkamp
patent: 4129152 (1978-12-01), Davis
patent: 4303104 (1981-12-01), Hegler et al.

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