Core bit having axial conical core breaker
US4207954A · kind A · utility
23Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1978 |
| Grant date | Jun 17, 1980 |
| Priority date | — |
| Expiry date | Mar 31, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/46
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling tool comprising a body having a leading face with a central recess providing the body with an annular leading cutting edge such that during drilling a central core is formed, and a central cone positioned axially in the recess for breaking up the core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.