Abstract
A rock drilling rig includes a movable carrier with a boom attached to it and movable in various ways. The free end of the boom is provided with drilling equipment. The drilling equipment is enclosed in a casing that prevents noise generated during drilling from spreading to the surroundings.The casing is arranged to move together with a feed beam and relative to the cradle mounted on the end of the boom.A flexible noise attenuating skirt projects forwardly from a front end of the casing for forming a sealed chamber around a drilling head.
Original language | English |
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Patent number | US6199656B1 |
Filing date | 29/09/99 |
Publication status | Published - 13 Mar 2001 |
MoE publication type | H1 Granted patent |