Rock drill bit
US4607712A · kind A · utility
19Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1984 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Dec 19, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/56
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Rock drill bit of the impact type comprising a cylindrical body and a front surface provided with fixed peripherally spaced inserts. The head section of each insert comprises a first and a second working surface. The first working surface is arched in the radial direction of the rock drill bit but planar in a direction perpendicular thereto. The second working surface is quarter-spherical and turned towards the center of the rock drill bit. A transition portion extends between the first working surface and the jacket surface of the insert. The transition portion determines the diameter of the bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.