Diamond mining core drill bit and methods of making thereof
US9689210B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2013 |
| Grant date | Jun 27, 2017 |
| Priority date | — |
| Expiry date | Dec 12, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/48
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A core drill bit includes an elongate hollow cylindrical body having opposite first and second end sections, a plurality of cutting segments with a connecting portion joined to the second end section, a plurality of reinforcing members joined to the second end section between the cutting segments and contacting adjacent cutting segments to offer rotational support thereto, and a plurality of current concentrators disposed on one or both of the second end section and the connecting portion. The cutting segments being capacitive discharge welded to the second end section whereby the surface of the second end section melts during the welding to affix the cutting segments with the tool body. The cutting segments include diamonds dispersed therein with portions having varying diamond concentrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.