Hollow article with zigzag projections

Details Hollow article with zigzag projections Hollow article with zigzag projections

1986-09-26

1988-06-28

Kittle, John E.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428188, 165133, 165182, 138121, 138173, B32B 320

Patent

active

047538333

ABSTRACT:
A tubular article with circumferential projections having radial or chordal corrugations. The chords have tooth-like formations or are parallel and directed vertically in underground installation. In the last case, the sides of the tube can be devoid of the corrugations, or have them radially or tooth-like. Furthermore, the projections can be skewed and alternating in the opposite directions. Also, the projections can have offset planes. Finally, in case of two corrugations, they are diametrically opposed in a single chordal direction and are represented by rings bent parallel to the applicable load which is adverse with thus prestressed projections.

REFERENCES:
patent: 2667337 (1954-01-01), Chapman
patent: 2876801 (1959-03-01), November
patent: 3122171 (1964-02-01), Britton et al.
patent: 3260652 (1966-07-01), Ritz et al.
patent: 3747352 (1973-07-01), Maroschak
patent: 3866286 (1975-02-01), Pasternak
patent: 3891007 (1975-06-01), Kleykamp
patent: 4085491 (1978-04-01), Mathwig
patent: 4168618 (1979-09-01), Saier et al.
patent: 4232712 (1980-11-01), Squires
patent: 4362187 (1982-12-01), Harris et al.
patent: 4435460 (1984-03-01), Menzel

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