Mine roof drill bit and cutting insert therefor
US5375672A · kind A · utility
36Cited by
10References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1992 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Oct 22, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/58
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An insert for use in a roof bit for drilling bolt holes in a mine roof includes a pair of cutting edges interconnected by a chisel edge. Each cutting edge is formed by an intersection of front and side faces of the insert. Each side face further includes at least one chamfer intersecting the respective cutting edge and the chisel edge to divide that cutting edge into inner and outer sections, each of which being sharper than the chisel edge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.