Duct making apparatus and method
US8499604B2 · kind B2 · utility
5Cited by
24References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2009 |
| Grant date | Aug 6, 2013 |
| Priority date | — |
| Expiry date | Sep 27, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49936
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A duct making apparatus bends a metal web to form a duct blank having a lock tab at a forward end and having a Z-fold at a rearward end. Prior to shearing off the duct blank from the metal web, the apparatus bends the duct blank to insert the lock tab into the Z-fold, and further bends the Z-fold to form a clinch tab holding the lock tab into the Z-fold. After shearing off the duct blank from the metal web, the apparatus clinches the clinch tab over the lock tab to form a completed duct blank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.