Patent ID: 9463562
Filing Date: 2016-10-11
CPC Classification: B25D

Claim Text:
1. Motor driven hammer comprising: a housing, a motor having a motor shaft and being arranged in the housing, a hammer mechanism including a cylinder in which a ram is arranged, the ram being slidable along a longitudinal axis of the cylinder and a tool holder which may support a tool bit so that the tool bit is aligned with the longitudinal axis of the cylinder, wherein the motor is coupled with the hammer mechanism, so that rotation of the motor shaft results in a reciprocating movement of the ram within the cylinder, the ram applying impacts on a tool bit supported by the tool holder during the reciprocating movement wherein, the ram is made at least partially of a paramagnetic material, a ferromagnetic material or a permanent magnet material, a coil arranged within the housing adjacent to the cylinder, a control unit connected with the coil, and wherein the control unit is adapted to apply a current to the coil so that the coil applies a force to the ram in the direction of the longitudinal axis of the cylinder during the reciprocating movement of the ram.