Patent ID: 7661485
Filing Date: 2010-02-16
Classification: B25D

Abstract:
1. A hammer drill comprising: an electric drive motor having a motor shaft; a tool shaft driven in rotation by the electric drive motor; a hammer action; wherein the tool shaft is driven by a first single-stage gear unit directly by the motor shaft of the electric drive motor and wherein the hammer action is driven by a second single-stage gear unit directly by the motor shaft of the electric drive motor; wherein the first single-stage gear unit connecting the motor shaft and the tool shaft is an angular gear unit and is comprised of a pinion, disposed on the motor shaft and provided with a spur gearing, and further comprised of a crown gear, disposed on the tool shaft and meshing with the pinion; wherein an axis of rotation of the hammer action is substantially parallel to the motor shaft and wherein the second single-stage gear unit connecting the motor shaft and the hammer action is a spur gear unit; and wherein the spur gearing of the pinion meshes with the crown gear and also a spur gear of the spur gear unit of the hammer action.