Drill steel removal attachment for rock drilling machine
US4446930A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Oct 25, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/171
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An attachment (15) for a percussive rock drilling machine (12) for withdrawing a drill steel from a drilled hole. The drilling machine is of the kind which is displaceable along a feed beam (14) by a feeding motor. The attachment (15) comprises a spring housing (17) which contains a compressive spring (22) and a stopping member (23), the housing being suspended by flexible means (26, 27) from a yoke-shaped member (18) coupled on to the drilling machine body (19). The stopping member (23) is arranged to abut against a coupling sleeve (32) or the like on the drill steel (16). When retracting the drilling machine (12) by the feeding motorand starting the ordinary percussive action, the impacts directed downwards will be transformed to impacts directed upwards which loosen and withdraw the stuck drill steel (16) from the drilled hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.