Abstract: An impact screwdriver having a housing includes an impact mechanism including a hammer interacting with an anvil for driving a tool, wherein the hammer is arranged on a drive shaft so as to be axially movable and preloaded in the axial direction, and wherein the hammer is driven by the drive shaft via a driver and is preloaded counter to the force of a spring element in order to trip and to transmit a rotary impulse to the anvil when a particular rotation angle is exceed, wherein the hammer and the anvil are mounted in a manner electrically insulated from one another and are connected to a voltage source, and wherein a sensor is provided for monitoring a current flow between the hammer and anvil during contact thereof for determining a contact duration between the hammer and anvil.

Abstract: An impact wrench and a method for operating an impact wrench are disclosed. In an embodiment, an impact wrench includes a housing, a motor-driven input shaft, an output shaft for mounting a tool and a hammer mechanism for transmitting a torque and coupling the input shaft to the output shaft, wherein a first bearing torque, which acts against a rotational direction of the output shaft, is present between the output shaft and the housing, wherein a second bearing torque, which acts against a rotational direction of the input shaft, is present between the output shaft and the input shaft when the input shaft is not coupled to the output shaft by the hammer mechanism, and wherein an absolute value of the first bearing torque is smaller than an absolute value of the second bearing torque.

Abstract: An impact screwdriver having a housing is disclosed comprising an impact mechanism including a hammer interacting with an anvil for driving a tool, wherein the hammer is arranged on a drive shaft so as to be axially movable and preloaded in the axial direction, and wherein the hammer is driven by the drive shaft via a driver and is preloaded counter to the force of a spring element in order to trip and to transmit a rotary impulse to the anvil when a particular rotation angle is exceeded, wherein the hammer and the anvil are mounted in a manner electrically insulated from one another and are connected to a voltage source, and wherein a sensor is provided for monitoring a current flow between the hammer and anvil during contact thereof for determining a contact duration between the hammer and the anvil.