Patent ID: 8333251
Filing Date: 2012-12-18
Classification: B25D

Abstract:
1. A method for controlling a pneumatically striking hand-held power tool, comprising the steps of: detecting an acceleration along a striking axis of the hand-held power tool; and reducing driving power if the detected acceleration is greater than a threshold value, the threshold value being selected to be greater than maximum acceleration values occurring on a workpiece during a striking operation of the hand-held power tool; wherein the occurrence of a residual strike is detected by checking at least one of the following criteria: first criterion: the acceleration occurs in the striking direction and its magnitude exceeds the threshold value; second criterion: the magnitude of the acceleration exceeds the threshold value twice within a first time span and third criterion: the magnitude of the acceleration exceeds the threshold value twice within a second time span; the driving power being reduced if a residual strike is detected.