Reinforced flexible duct with integral molded liner

Details Reinforced flexible duct with integral molded liner Reinforced flexible duct with integral molded liner

1977-09-19

1980-04-08

Aegerter, Richard E.

Pipes and tubular conduits

Distinct layers

With spiral seam

138125, 138127, 138129, 138122, 138133, 138154, 138174, F16L 1108, F16L 1112

Patent

active

041967550

ABSTRACT:
The reinforced flexible duct consists of a single- or double-ply reinforcing fabric, a wire helix, and a continuous extruded liner. The fabric, wire helix, and extruded liner are continuously helically wound on a mandrel. The freshly extruded liner adheres to itself, to the helically wound wire, and to the reinforcing fabric to form a continuous reinforced flexible duct. Optionally, a narrower continuously extruded and wound scuff strip can be wound over the wire helix.

REFERENCES:
patent: 1974285 (1934-09-01), Maclachlan
patent: 2748805 (1956-06-01), Winstead
patent: 2884957 (1959-05-01), Happis et al.
patent: 3047026 (1962-07-01), Kahn
patent: 3275038 (1966-09-01), Roberts et al.
patent: 3548882 (1970-12-01), Rinker
patent: 3554237 (1971-01-01), Pelley et al.
patent: 3916953 (1975-11-01), Nagayoshi et al.

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