The control method for a hammer drill (1) provides the following steps. During basic operation, the motor (5) rotates at an operating speed for the drilling operation with chiseling action in order to rotationally drive the tool holder (2) and to drive the hammer mechanism (6) with a nominal striking power. The torque coupling (21) is monitored with the aid of a sensor (26). If a disengagement of the torque coupling (21) occurs, the striking power of the hammer mechanism (6) is reduced to below 10% of the nominal striking power during a disengagement of the torque coupling (21), and the torque coupling (21) is driven. When the disengagement of the torque coupling (21) ends, the striking power of the hammer mechanism (6) is increased to the nominal striking power and the torque coupling (21) is driven at the operating speed for the drilling operation with chiseling action.

A machine tool device in one embodiment is configured to provide open-loop and/or closed-loop control of at least one machine tool function of a portable machine tool. The machine tool device includes at least one detection unit configured to detect at least one characteristic variable of the machine tool and/or of a processing tool arranged on the machine tool. The machine tool device further includes at least one brake unit, wherein at least one brake function of the brake unit is adapted at least partially automatically, and in particular dynamically, depending on the at least one detected characteristic variable.

The invention relates to a tool apparatus (10) with a drivable tool (1), comprising a shaft (2) which is coupled to the tool (1), further comprising one or plural braking bodies (3) which in particular are arranged distributed around the shaft (2) in the circumferential direction, wherein the tool apparatus (10) is adapted to bring the one or plural braking bodies (3) from a release state into a braking state in the course of a braking procedure, wherein in the braking state the one or the plural braking bodies (3) are in contact with the shaft and thereby exert a braking force upon the shaft (2), so that the shaft (2) and thereby also the tool (1) are braked and wherein in the release state the one or the plural braking bodies (3) are not in contact with the shaft (2).

A hand-held power tool, in particular a saber saw, having at least one holding unit for fastening the hand-held power tool to a holding device, in particular to an arresting cable and/or carabiner clip. The holding unit includes at least one receiving opening for receiving the holding device, and at least one damping element for damping a force transferred from the holding device to the hand-held power tool, in particular to a housing of the hand-held power tool. The damping element includes an at least substantially elastic element that at least partially encloses the receiving opening and receives in a form-fitting manner a fastening part delimiting the receiving opening.

A power tool including a motor configured to produce an output, and a sensor configured to measure an acceleration of the power tool along at least one of three spatial axes and generate an output signal related to the acceleration. The power tool further including a controller configured to receive the output signal related to the acceleration of the power tool from the sensor, compare the acceleration of the power tool to a free-fall acceleration threshold, initiate a timer when the acceleration of the power tool corresponds to the free-fall acceleration threshold, compare the timer to a free-fall timer threshold, and stop the motor from producing the output when the timer is greater than or equal to the free-fall timer threshold.

A safety system, for use with a power tool, includes a sensor assembly and a controller. The power tool includes a base and a moving component that is movable relative to the base. The sensor assembly monitors a predetermined danger zone that is adjacent to the moving component of the power tool. The sensor assembly is configured to generate data relating to the predetermined danger zone. The controller receives the data from the sensor assembly and analyzes the data from the sensor assembly to determine if at least a portion of a hand of the user is present within the predetermined danger zone. The safety system can further include a wearable component including infrared only reflective material that is coupled to the hand of the user. The controller analyzes the data from the sensor assembly to determine if the wearable component is present within the predetermined danger zone.

A safety braking device for a machine tool for braking a processing tool driven by means of an electric motor via an output unit, more particularly an output shaft, includes at least one braking device which is provided to halt rotation of the output unit in a braking process. The braking device has at least a first braking stage and a second braking stage. The disclosure further relates to a machine tool having the safety braking device and to a method for operating a safety braking device.

A circuit for a smart safety system includes an electrical input connection to obtain power from a power source and an electrical output connection to regulate the power to an AC motor. The circuit also includes an adjustable DC power supply. One or more electronic switching devices regulate electricity output to the AC motor. The circuit has one more functional states including: a first state, activated via a first electrical signal, in which electricity is supplied to AC motor to allow normal operation of the AC motor, and a second state, activated via a second electrical signal, in which no electricity is supplied to the AC motor to prevent unintentional operation of the AC motor.

A gearhead for a handheld power tool for machining workpieces, having a housing in which an output that can be connected to a drive of a handheld power tool is accommodated, and also having a tool shaft to which a tool can be coupled, wherein a braking device that can be moved between a braking position and a release position and that acts upon the tool shaft is provided for braking of the tool shaft. A switching device is provided that can be moved between a first switching position, in which the tool shaft is connected to the output in a power transmitting manner and in which the braking device is transferred into the release position, and a second switching position, in which the tool shaft is decoupled from the output and in which the braking device is transferred into the braking position.

Power tools and methods of operating power tools are disclosed herein. The power tools include a motor including a motor shaft configured to rotate about a shaft rotational axis. The power tools also include a sensor assembly configured to generate a differential voltage signal that is indicative of a distance between an individual and a cutting tool being less than a threshold distance. The sensor assembly also is configured to produce a sensor assembly output that is based upon the differential voltage signal. The power tools further include an analysis circuit configured to receive the sensor assembly output and to generate a trigger signal responsive to the sensor assembly output being outside a nominal sensor assembly output range. The power tools also include a mechanical reaction mechanism configured to insulate the individual from the cutting tool responsive to receipt of the trigger signal.