Replacement of mains
US4505302A · kind A · utility
59Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1983 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Jan 21, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T225/371
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A mole 1 for replacing an existing main, for example a cast iron gas main, with a new main. The mole 15 is of steel and is inserted into and along the existing main 94. The mole 51 has a front portion comprising a head 52 and a cylindrical body portion and a rear portion 53 having a clamp 54 for clamping a new main to the mole 51. The head 52 has a cutting face 55 for engaging the internal wall of the existing mole 51 therealong. The new main which in use is clamped to the mole 51 is towed along behind the mole 51 to replace the fractured old main 94.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.