Flexible duct

Details Flexible duct Flexible duct

1992-07-24

1996-06-18

Scherbel, David

Pipes and tubular conduits

Flexible

Spirally wound material

138134, 138138, 138150, F16L 1108

Patent

active

055268498

ABSTRACT:
A flexible duct and method for making the duct are disclosed. The duct includes an inner wall bonded to an outer wall, so as to sandwich a wire resilient helix and a yarn helix therebetween. The yarn helix is axially displaced from the wire helix so that the turns of the yarn helix are intermediate of the turns of the wire helix. The method of manufacturing the duct includes forming the wire and yarn helix about the inner wall and bonding the outer wall to the inner wall so as to sandwich the helix between the inner and outer walls.

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patent: 4599784 (1986-07-01), Canu, Jr. et al.
patent: 4899787 (1990-02-01), Ouchi et al.

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