Rock drill
US4889200A · kind A · utility
18Cited by
9References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Mar 7, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23B2251/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rock drill is provided in which an optimum support of the carbide cutting tip or of a cross cutting edge is achieved by the drill head being made square or rectangular in cross-section. This results in an optimum strengthening of the cross-section against fracture in the slot root for the cutting tips. Moreover, catching of the drill in fissured rock and under extreme loads such as in reinforcement drill holes is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.