Reinforced flexible duct with integral molded liner
AssigneeAutomation Industries, Inc.
InventorsThomas A. Kutnyak, Marvin A. Koerber
Life of this patent
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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.
Claims11
A reinforced duct comprising, a helically wound member defining a pitch, a helically wound internal liner layer having a width in the axial direction of said duct greater than one pitch length, said liner layer being of polymer composition material, a helically wound web of fabric material overlying a portion of said liner layer and leaving a trailing edge margin of the liner layer convolutions uncovered by said web, successive convolutions of said liner layer overlapping and adhered to said uncovered trailing edge margin, said web having a width in the axial direction of said duct greater than one pitch length, said helical member overlying said web, said liner layer and said overlapping relationship of successive convolutions thereof providing a continuous smooth bore for said duct.
Dependencies are inferred from the claim text.