Ram boring machine with impact blade piston
US4732222A · kind A · utility
42Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Sep 23, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/1658
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a ram boring machine for laying pipelines without trenching, a double blade that is axially moveable against a compression spring is housed in an impact tip and projects through slots in the impact tip. The double blade is struck by a striker piston and moves, during the breaking-up of an old pipe laid in the ground, substantially independently of the ram boring machine or of its housing. In this way substantially all the impact energy of the piston is used for the benefit of the breaking-up operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.