Abstract: A safety braking device for a machine tool for braking a processing tool driven by 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.

Abstract: A safety brake device for braking a machining tool includes at least one brake device configured as an at least two-part claw clutch. The claw clutch includes a first claw-clutch part, and a second claw-clutch part. The first claw-clutch part is arranged on the output shaft so as to allow no relative rotation, the second claw-clutch part is configured to allow no relative rotation with respect to the power tool, each claw-clutch part has a respective plurality of toothing elements, the respective plurality of toothing elements are configured to engage with one another during a braking operation to stop rotation of the output shaft, and a maximum angular spacing ?max of mutually adjacent toothing elements of at least one of the first plurality of toothing elements an the second plurality of toothing elements is determined depending on a maximum rotational speed of the output shaft.

Abstract: In a method for identifying a deflection or a breakdown of a machine tool, in particular a hand-held machine tool, with an oscillating output movement, in particular a linearly oscillating output movement, at least one physical characteristic of the machine tool, in particular of a motor, a powertrain component, and/or a machining tool of the machine tool, is detected continuously or periodically by means of a detection unit. The method further includes detecting a deflection or a breakdown of the machine tool with an analysis unit on the basis of at least two values, which are identified at different times, of the characteristic of the machine tool, wherein each of the at least two values of the characteristic are associated with at least one respective substantially identical value of a discrete position characteristic of the oscillating output movement, in particular the linearly oscillating output movement, of the machine tool.

Abstract: A frequency interference prediction system, used to electronically detect signals transmitted from one or more devices at a specified frequency. For each of the detected signals, the frequency interference prediction system detects the packet error rate, signal strength, and frequency channel and records the time the signal was detected. The frequency interference prediction system determines whether there is interference on the frequency channel at the time the signal was detected based on the packet error rate, signal strength, and frequency channel. The frequency interference prediction system then predicts whether there will be interference on the signal at a future time based on the determination that there was interference on the frequency channel and the times the signals were detected.

Abstract: 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.

Abstract: In a method for identifying a deflection or a breakdown of a machine tool, in particular a hand-held machine tool, with an oscillating output movement, in particular a linearly oscillating output movement, at least one physical characteristic of the machine tool, in particular of a motor, a powertrain component, and/or a machining tool of the machine tool, is detected continuously or periodically by means of a detection unit. The method further includes detecting a deflection or a breakdown of the machine tool with an analysis unit on the basis of at least two values, which are identified at different times, of the characteristic of the machine tool, wherein each of the at least two values of the characteristic are associated with at least one respective substantially identical value of a discrete position characteristic of the oscillating output movement, in particular the linearly oscillating output movement, of the machine tool.

Abstract: A frequency interference prediction system, used to electronically detect signals transmitted from one or more devices at a specified frequency. For each of the detected signals, the frequency interference prediction system detects the packet error rate, signal strength, and frequency channel and records the time the signal was detected. The frequency interference prediction system determines whether there is interference on the frequency channel at the time the signal was detected based on the packet error rate, signal strength, and frequency channel. The frequency interference prediction system then predicts whether there will be interference on the signal at a future time based on the determination that there was interference on the frequency channel and the times the signals were detected.

Abstract: A safety brake device for a power tool includes a decoupling device, configured to decouple an output unit from a drive unit during a braking operation thereby reducing at least one of a rotational mass and rotational energy of the output unit, and a brake device with a first brake device part and a second brake device part. The first brake device part is arranged on the output unit so as to allow essentially no relative rotation, and the second brake device part is configured to allow essentially no relative rotation with respect to the power tool. The first brake device part and the second brake device part are configured to interact mechanically with one another during a braking operation to stop rotation of the output unit. The first brake device part of the brake device is embodied in one piece with the decoupling device.

Abstract: A frequency interference prediction system, used to electronically detect signals transmitted from one or more devices at a specified frequency. For each of the detected signals, the frequency interference prediction system detects the packet error rate, signal strength, and frequency channel and records the time the signal was detected. The frequency interference prediction system determines whether there is interference on the frequency channel at the time the signal was detected based on the packet error rate, signal strength, and frequency channel. The frequency interference prediction system then predicts whether there will be interference on the signal at a future time based on the determination that there was interference on the frequency channel and the times the signals were detected.

Abstract: A machine tool device for a portable machine tool in one embodiments includes at least one coupling unit which couples a machining tool and at least one drive unit configured to drive the coupling unit. The machine tool device includes a recuperation unit which provides, in at least one deactivated state of the drive unit, electrical energy which supplies at least one functional unit from a kinetic energy of at least the coupling unit.

Abstract: A machine tool device includes at least one motorized machining tool, at least one, particularly capacitive, sensor unit, configured to detect at least one foreign body in at least one detection area around the machining tool, and at least one closed-loop and/or open-loop control unit configured to trigger at least one action depending on at least one signal from the sensor unit. The sensor unit includes at least one antenna configured to emit at least one electrical and/or magnetic field, which defines the at least one detection area, and/or to detect the at least one foreign body depending on at least one change in the at least one electrical and/or magnetic field.

Abstract: A machine tool device includes at least one motor-driven machining tool; at least one sensor unit, in particular a capacitive sensor unit, which is configured to detect at least one foreign body in at least one detection area around the machining tool; and at least one open-loop and/or closed-loop control unit configured to trigger at least one action in accordance with at least one signal from the sensor unit. The sensor unit includes at least one antenna configured to emit at least one electric and/or magnetic field defining the at least one detection area and/or to detect the at least one foreign body in accordance with at least one change in at least one electric and/or magnetic field.

Abstract: 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.

Abstract: A frequency interference prediction system, used to electronically detect signals transmitted from one or more devices at a specified frequency. For each of the detected signals, the frequency interference prediction system detects the packet error rate, signal strength, and frequency channel and records the time the signal was detected. The frequency interference prediction system determines whether there is interference on the frequency channel at the time the signal was detected based on the packet error rate, signal strength, and frequency channel. The frequency interference prediction system then predicts whether there will be interference on the signal at a future time based on the determination that there was interference on the frequency channel and the times the signals were detected.

Abstract: A safety brake device for braking a machining tool includes at least one brake device configured as an at least two-part claw clutch. The claw clutch includes a first claw-clutch part, and a second claw-clutch part. The first claw-clutch part is arranged on the output shaft so as to allow no relative rotation, the second claw-clutch part is configured to allow no relative rotation with respect to the power tool, each claw-clutch part has a respective plurality of toothing elements, the respective plurality of toothing elements are configured to engage with one another during a braking operation to stop rotation of the output shaft, and a maximum angular spacing ?max of mutually adjacent toothing elements of at least one of the first plurality of toothing elements an the second plurality of toothing elements is determined depending on a maximum rotational speed of the output shaft.

Abstract: A safety brake device for a power tool includes a decoupling device, configured to decouple an output unit from a drive unit during a braking operation thereby reducing at least one of a rotational mass and rotational energy of the output unit, and a brake device with a first brake device part and a second brake device part. The first brake device part is arranged on the output unit so as to allow essentially no relative rotation, and the second brake device part is configured to allow essentially no relative rotation with respect to the power tool. The first brake device part and the second brake device part are configured to interact mechanically with one another during a braking operation to stop rotation of the output unit. The first brake device part of the brake device is embodied in one piece with the decoupling device.

Abstract: 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.

Abstract: A portable circular saw has a sole plate, a housing, and a drive unit which is arranged at least partially in the housing and to which a tool receptacle for an interchangeable saw blade is assigned. The drive unit is configured to drive the interchangeable saw blade in rotation about an associated axis of rotation, and the portable circular saw is guidable along a workpiece by means of the sole plate. The saw further includes a securing device having at least one sensor element. The securing device is configured to detect at least one breaking of the portable circular saw into the workpiece during a sawing operation and, upon detecting any breaking into the workpiece, to brake and/or switch off the drive unit.

Abstract: The disclosure relates to a circular saw, in particular a hand-held circular saw, having a housing and a drive unit, at least some sections of which are arranged in the housing and with which a tool holder for an exchangeable saw blade is associated. The drive unit is designed to rotationally drive the exchangeable saw blade about an associated axis of rotation. In the circular saw, a blade guard is associated with the exchangeable saw blade. The blade guard is mounted in the housing for rotation about the associated axis of rotation and extends around a cutting point of the exchangeable saw blade at least during a sawing operation in such a way that contact with the cutting point can be at least substantially prevented.

Abstract: A machine tool device for a portable machine tool in one embodiments includes at least one coupling unit which couples a machining tool and at least one drive unit configured to drive the coupling unit. The machine tool device includes a recuperation unit which provides, in at least one deactivated state of the drive unit, electrical energy which supplies at least one functional unit from a kinetic energy of at least the coupling unit.