Method and apparatus for prestressing fastener holes
US4471643A · kind A · utility
45Cited by
19References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1982 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | Feb 10, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4994
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pull gun (10) is used for pulling a mandrel (12, 150, 180) through an expandable sleeve (74, 144, 180) positioned in a fastener hole. The mandrel expands the sleeve as it moves therethrough causing the sleeve to put the metal which surrounds the hole in a state of compression. The pull gun has alternative extensions or sleeve retainers having general appearances of collet chucks and they are adapted to be positioned adjacent holes being prestressed. The retainers are of relatively small diameter for operation through a drill fixture and in small spaces on a workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.