Method of removing plugs
US4800637A · kind A · utility
12Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Dec 7, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53122
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A mechanical plug (20) having internal threads (24) and displaceable cone (30) for expanding the plug into secure engagement with a steam generator tube (14) is removed by a method which includes the step of moving the cone (30) upwardly within an internal cavity (22) along tapered surface (26), stretching the plug and thereby reducing its diameter by means of a tube stretcher 40 having an internally and externally threaded adapter (42), a bolt-like expander (50) and a force pad (52), and, pulling the plug from the tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.