Abstract: The invention relates to a pneumatically operated drill hammer, comprising a piston and a distributor axially arranged relative to each other in a housing, the piston being arranged to be moved axially between a first position and a second position. The drill hammer further includes a pneumatic drive system, including a drive chamber, a return chamber and a plurality of channels for distribution of drive gas in said drive system. The return chamber is arranged at a lower side of the piston and the drive chamber is arranged at an upper side of the piston, wherein the drive chamber is defined by a variable space enclosed by at least the housing, the piston and the distributor. The drive chamber includes at least one inlet port and at least one exhaust port arranged at a circumference of the drive chamber.

Abstract: The invention relates to a pneumatically operated drill hammer, comprising a piston and a distributor axially arranged relative to each other in a housing, the piston being arranged to be moved axially between a first position and a second position. The drill hammer further includes a pneumatic drive system, including a drive chamber, a return chamber and a plurality of channels for distribution of drive gas in said drive system. The return chamber is arranged at a lower side of the piston and the drive chamber is arranged at an upper side of the piston, wherein the drive chamber is defined by a variable space enclosed by at least the housing, the piston and the distributor. The drive chamber includes at least one inlet port and at least one exhaust port arranged at a circumference of the drive chamber.

Abstract: A breaker tool has a chassis carrying a motor, an impact mechanism operating in a certain working direction, an enclosure rigidly connected to the chassis and surrounding at least the motor, and a handle device including two handles protruding from opposite sides of the enclosure and are vibration damped relative to the chassis via swing arms, where the swing arms are arranged to accomplish a flexible parallel movement providing coupling between the chassis and the handle device. The handle device includes a bridge to which the handles are secured. The swing arms are pivotally connected to the bridge via first pivots and to the chassis via second pivots, where at least one of the first and second pivots is a torsion pivot that provides a limited torsion damped oscillation of the bridge relative to the chassis in a direction substantially parallel with the working direction.

Abstract: A breaker tool has a chassis carrying a motor, an impact mechanism operating in a certain working direction, an enclosure rigidly connected to the chassis and surrounding at least the motor, and a handle device including two handles protruding from opposite sides of the enclosure and are vibration damped relative to the chassis via swing arms, where the swing arms are arranged to accomplish a flexible parallel movement providing coupling between the chassis and the handle device. The handle device includes a bridge to which the handles are secured. The swing arms are pivotally connected to the bridge via first pivots and to the chassis via second pivots, where at least one of the first and second pivots is a torsion pivot that provides a limited torsion damped oscillation of the bridge relative to the chassis in a direction substantially parallel with the working direction.