Two-ply duct core

Details Two-ply duct core Two-ply duct core

1978-04-27

1980-05-27

Footland, Lenard A.

Pipes and tubular conduits

Flexible

Spirally wound material

138133, 138138, F16L 1108, F16L 1116

Patent

active

042045622

ABSTRACT:
A collapsible tubing is disclosed wherein a first flexible strip is helically wound with adjacent edges of adjacent wraps in edge lapping relation, a forming or reinforcing element such as a wire is helically wound in overlying centered relation to lapping edges of the first strip and a second flexible strip is helically wound about the first strip covering and encasing the first strip and reinforcing wire, the second strip having adjacent edges of adjacent wraps in lapping relation symmetrically disposed in staggered relation to the lapping edges of the underlying first strip.

REFERENCES:
patent: 1478083 (1923-12-01), Whitmarsh
patent: 2640500 (1953-06-01), Hamblin
patent: 3525656 (1970-08-01), Kennedy

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