Means for drilling
US4408669A · kind A · utility
68Cited by
5References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1978 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Apr 24, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/66
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Drilling means of the type having a pilot bit, a reamer and a guidemember mounted in the bottom end of the casing tube, and which transmits impacts to the casing. The guide member is snugly enclosed in the thickened mouth portion of the casing tube and has a plurality of channels which are segments of a spiral through which the drilling debris is discharged upwardly to the casing tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.