Motor-driven screwing and transporting tool for reactor pressure vessel head retaining fastenings
US4047456A · kind A · utility
30Cited by
3References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1976 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Sep 21, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The invention concerns a motor-driven screwing and transporting tool for tightening or loosening the threaded studs and associated tightening nuts of the head bolting of pressure vessels. After the tightening nuts are loosened or before they are tightened, the weight of the studs is taken over by rotating bearings that can be lifted, so that the studs with their tightening nuts can be screwed in or out, the screw threads of the studs being thus weight-relieved. The invention is intended primarily for nuclear reactor pressure vessels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.