AN IMPACT MECHANISM ROCK DRILL AND DRILL RIG COMPRISING SUCH IMPACT MECHANISM

摘要

The invention relates to an impact mechanism comprising a housing (32) with at least two stroke adjustment channels (18 19 20); an adjustment arrangement (31) with at least two adjustment pin channels (35 36 37 135 136 137) arranged to interact in a manner that can be selected with the stroke adjustment channels (18 19 20); and a hammer piston (1) that performs reciprocating motion in the housing (32) in order to impact repetitively onto an anvil (2) which hammer piston (1 ) has a stroke length that can be selected with the aid of adjustment pin channels (35 36 37 135 136 137) and the stroke adjustment channels (18 19 20). According to the invention the adjustment arrangement (31 ) comprises an elastic element (48) arranged to maintain the adjustment arrangement (31) in place for the stroke length that has been selected; and an operating means (34) arranged to select adjustment pin channel (35 36 37 135 136 137) and thus the stroke length of the hammer piston (1).