Patent ID: 9511489
Filing Date: 2016-12-06
CPC Classification: B25D,E21B

Claim Text:
1. An impact mechanism comprising a housing with at least two stroke adjustment channels; an adjustment pin having longitudinal grooves, arranged along the axis of the adjustment pin and separated around the adjustment pin, said longitudinal grooves forming adjustment pin channels arranged for freely chosen interaction with the stroke adjustment channels; and a hammer piston that performs reciprocating motion in the housing in order to repetitively impact onto an anvil, which hammer piston has a stroke length that can be selected with the aid of said adjustment pin channels and the stroke adjustment channels, and an elastic element arranged to maintain the adjustment pin in position for the stroke length that has been selected; and an operating means arranged to select one of said adjustment pin channels by means of rotation of the adjustment pin and thus the stroke length of the hammer piston.