Synthetic resin pipe

Details Synthetic resin pipe Synthetic resin pipe

1998-05-22

2000-02-15

Kashnikow, Andres

Pipes and tubular conduits

Flexible

Corrugated

138110, 138155, 138177, F16L 9127

Patent

active

060241306

ABSTRACT:
A pipe having a substantially square cross section portion and a substantially circular cross section portion are disposed alternately in the axial direction of the pipe. The thickness of the circular portion is set uneven in the circumferential direction. In particular, the thickness of the portions of the circular portion that correspond to the corner portions of the square portion is set larger than the thickness of the portions that correspond to the central portions of the respective sides of the square portions. Accordingly, a pipe having corner portions with increased pressure deformation resistance is obtained. Also, the pipe is capable of being manufactured in a high efficiency manner.

REFERENCES:
patent: 2146352 (1939-02-01), Rohrer
patent: 2397655 (1946-04-01), Francis
patent: 3076669 (1963-02-01), Schlein
patent: 3603905 (1971-09-01), Schuttloffel
patent: 3693664 (1972-09-01), Schmunk
patent: 5664606 (1997-09-01), Anderson
patent: 5792532 (1998-08-01), Pfleger
patent: 5799703 (1998-09-01), Kanao et al.
patent: 5832960 (1998-11-01), Amatsutsu et al.
patent: 5839477 (1998-11-01), Murayama
patent: 5939160 (1999-08-01), Kline et al.

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