Shaft bearing in a rock and ground-drilling machine
US5795079A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1996 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Jun 7, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B3/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rock or ground-drilling machine includes a gear housing (14) in which there is journalled a shaft (31) which surrounds a drill string (23) in the manner of a sleeve and which is affixed to the drill string by means of a chuck (7) connected to the shaft (31). the chuck is operated by means of pressure fluid delivered to the chuck (27) through the medium of a commutator (36) acting between the gear housing (14) and the shaft (31). the shaft (31) is journalled in the gear housing (14) by means of one single rolling bearing (39). the commutator (36) lies resiliently against the gear housing (14) and is flexible in response to sideways movement of the shaft (31).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.