Motor-driven screwing and transporting tool for reactor pressure vessel head retaining fastenings
Patent
·
OSTI ID:7279326
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. 21 claims, 6 figures.
- Assignee:
- Kraftwerk Union AG
- Patent Number(s):
- US 4047456
- OSTI ID:
- 7279326
- Resource Relation:
- Patent Priority Date: Priority date 17 Dec 1974, German, Federal Republic of (F.R. Germany)
- Country of Publication:
- United States
- Language:
- English
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