Bolt with integral locking member
US6164886A · kind A · utility
6Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1999 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Aug 24, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S411/972
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A high strength bolt fastens a baffle plate and a former plate of a pressurized water nuclear reactor pressure vessel together. The bolt has a head portion and an integral locking member extending from the head portion for engaging one of the structural members to lock the bolt with the structural member. The integral locking member portion has a lower yield stress than the yield stress of the shank. A lower yield stress may be obtained by selective annealing. The locking member is less susceptible to stress corrosion cracking in high temperature, high pressure water of commercial nuclear power reactors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.