Monolithic roof cutting bit insert
US6860344B2 · kind B2 · utility
16Cited by
59References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2001 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Sep 27, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/58
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert presents at least three discrete leading cutting edges for cutting the earth strata. Each cutting edge is stepped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.