Mechanically fastened center vacuum roof drill bit
US4603751A · kind A · utility
21Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1984 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | Feb 16, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/60
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Disclosed according to the invention is a center vacuum roof drill bit. The roof drill bit has a body having an axis of rotation, a seat transverse to the axis of rotation, a periphery and a forward working end. The roof drill bit has at least one flat-like insert positioned on the seat. There is also means for releasably clamping the insert, the means clamping the insert near the periphery only of the body. In other embodiments of the roof drill bit, there is a second flat-like insert and, additionally, provisions are made for self centering the insert or inserts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.