Method of prestressing bolts
US4229875A · kind A · utility
5Cited by
4References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1978 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Dec 26, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49874
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A fatigue resistant bolt, and method for making same, is disclosed. Bolts which are tightened to very high loads and are subjected to a dynamic environment are particularly subject to fatigue failure. It has been found that a bolt with fatigue resistant properties may be manufactured if its threads are formed while it is subjected to its design load. In another embodiment of the invention it has been found that the fatigue properties of the fillet at the bolt head and shank juncture may be significantly increased if the fillet is cold worked while the bolt is subjected to its design load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.