Apparatus for making a double-walled structure
US5881442A · kind A · utility
8Cited by
13References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1997 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Oct 22, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53357
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
In an apparatus for producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically wound together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.