Tubular plastics objects

Details Tubular plastics objects Tubular plastics objects

1983-05-05

1986-01-28

Bryant, III, James E.

Pipes and tubular conduits

Spirally seamed

138122, 138129, 428192, F16L 916

Patent

active

045664960

ABSTRACT:
The formation of tubular objects by spirally winding and seaming a relatively rigid strip of plastics material. A sealing flap (15, 215) along one longitudinal edge (5, 25) of the strip, and an engaging surface (16, 216) along the other edge (11, 211) positioned close to but separate from the interlocking portions (8 and 12, 28, 212) of these longitudinal edges. The provision of these sealing flaps and engaging surfaces permit the interlocking portions at the edges to be designed independent of the ability of these interlocking portions to create a fluid seal. This results in optimum operation of these interlocking portions to, for example, permit relatively rapid changes in the diameter of the tube as it is formed, as well as subsequent to its formation.

REFERENCES:
patent: 2739089 (1956-03-01), Hageltorn
patent: 4062380 (1977-12-01), Hofle
patent: 4209043 (1980-06-01), Menzel

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