Attachment for a percussive rock drilling machine.

摘要

An attachment for a percussive rock drilling machine (12) of the kind being displaceable along a feed beam (14) by a feeding motor. The attachment (15) is arranged for enabling withdrawal of drill steels (16) which are stuck in the drilled hole. The attachment (15) comprises a spring housing (17) which contains a compressive spring (22) and a stopping member (23), said 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 said feeding motor and 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).