Apparatus for reinforcing a duct
US4237940A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Jan 5, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L9/003
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A duct reinforcement and a method for building the reinforcement including a special tool for use in a preferred method are disclosed. The duct reinforcement includes a support washer on each of two opposing sides of the duct to be supported and a stiff wire extending through the sides of the ducts and both washers. The portion of the wire protruding beyond each support washer on the outside of the duct forms a hook with a tip of the wire substantially opposed to the outer face of the respective support washer. A preferred form of the support washer forms a volcano-shaped contour surrounding the washer hole on the outer face so that the tip of the wire makes contact with the washer inside the crest of the volcano-shaped contour. A preferred arrangement includes a rubbery seal between each support washer and the respective side of the duct to prevent leakage from the duct.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.