Cutter, a stopper means and a method of preventing mud from entering into a cutter
US5984024A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1998 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Apr 22, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention relates to a cutter for a raise boring head. The cutter is rotatable about a center axis and mounted, via a shaft of the cutter, in a saddle secured to the raise boring head. The shaft has ends that are secured to the saddle by a fastening mechanism. Bearings are provided between the shaft and a hub of the cutter in order to make it possible for the hub to rotate relative to the shaft. Seals are provided between the shaft and the hub, and the bore which is provided for introducing lubrication into the interior of the cutter. An expansion plug is mounted in the bore. The expansion plug is designed to accommodate the lubrication that enters into the bore from the bearings. A stopper is provided in the bore. The stopper encases a part of the fastening mechanism and is arranged to prevent mud from entering the orifice of the bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.