Cutters
US4442891A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1982 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Mar 1, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T409/304424
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention provides a cutter device for use especially in an underground pipeline or passageway such as a sewer which has been lined with a rigid resin lining, the cutter device serving to cut the lining where it covers lateral connections which must be re-opened. The cutter device according to the invention provides a cutter with a cutting bit which can be moved in an orbital fashion to enable the line of action of the cutter bit to maintain its angularity with respect to the angularity with which the lateral meets the main pipeline or passageway. The cutter bit preferably is a rotatable cutter bit, but in the alternative it may be for example a jet of liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.