Roof bit
US4492278A · kind A · utility
38Cited by
4References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1984 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Jul 27, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/38
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cutter bit wherein the dust collection openings are formed diametrically opposite each other, on an axis transverse to the longitudinal central axis of the bit body, and at least partly in the tapered dust control surfaces. The junctions of the heel surfaces and dust control surfaces define a pair of crown lines being parallel to one another and in planes which intersect the carbide insert in oblique fashion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.