Countersink roof bit drill and method for using the same
US7708087B2 · kind B2 · utility
1Cited by
26References
46Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 10, 2007 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Apr 10, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0086
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roof bit drill has a central shaft with a front end and a back end. The drill also has a base secured about the central shaft proximate to the front end, wherein the base has clearance channels extending axially therethrough. At least one cutting element is arranged on the base in a convex cutting pattern to permit loosened material to be evacuated. The roof bit drill may further include a drill depth locator to identify when the drill has been advanced within a mine roof to a predetermined depth. A method for using the roof drill bit is also disclosed herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.