SAFETY DEVICE FOR REDUCED-VIBRATION PNEUMATIC HAMMERS

A pneumatic hammer having a vibration attenuating hollow cylindrical member axially movable in a housing body, a striking piston axially movable within the cylindrical member, a stationary sealing sleeve engaging a portion of the outer surface of the cylindrical member, inlet air control means including an inlet passage in the wall of the cylindrical member, a slidable pressure ring cooperating with a pressure spring for urging the cylindrical member into a rest position in which the inlet air control means are disconnected from the inlet air channel and are connected instead to an outlet air channel in the housing body. Upon lifting the cylindrical member via a working tool, the passage to the outlet air channel is closed and the passage from the inlet air channel to the inlet air control means is opened and a normal operation of the hammer is initiated.