Flexible duct and method of making same
US6158477A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1998 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Dec 18, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L11/088
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A flexible duct and method for making the duct are disclosed. The duct includes an inner wall bonded to an outer wall, with a wire resilient helix and a scrim sandwiched therebetween. The scrim is in the form of a helical tape embedded between the outer wall and the inner wall, and preferably consists of a bonded yarn constructed in a layered or interwoven square or other uninterrupted geometrical pattern. The presence of the scrim provides the duct with high tensile strength and excellent tear resistance in all directions, especially in the helical direction. The method of manufacturing the duct includes the steps of helically forming the wire and scrim about the inner wall and bonding the outer wall to the inner wall to as to sandwich the helix and the scrim between the inner and outer walls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.