An electric portable power tool, having a housing, a shaft, a control cam, an electric drive accommodated in the housing to drive the drive shaft, and an output unit that is positively connected with the drive via a mechanical shut-off clutch to transfer torque from the drive to an insertion tool connected with the output unit. The mechanical shut-off clutch comprises a control ring that is axially mounted against the force of the return spring and at least one switch element that is run on the control cam. The control cam is delimited at one end by a first switching contour for providing a release torque of the shut-off clutch and by a boundary contour at another end. The control cam is associated with a second switching contour for providing a pre-torque which is less than the release torque.

An electric power tool in one aspect of the present disclosure includes a motor, an impact mechanism, and a control circuit. The control circuit executes a motor control process. The motor control process includes limiting an output of the motor in response to establishment of a preset condition. The preset condition is based on a load applied to the motor.

A tool includes a first output from a gear system, the first output along a first axis and a second output from the gear system, the second output along a second axis. A first torque limiter is attached to the first output along the first axis and a second torque limiter is attached to the second output along the second axis. A first tool bit is attached to the first torque limiter along the first axis and a second tool bit attached to the second torque limiter along the second axis.

A power tool, including a support structure, a pivot bearing arranged on the support structure, a shaft mounted on the support structure via the pivot bearing, a rotatable tool coupled to the shaft, in particular a saw blade, milling cutter or grinding wheel, a strain gauge arrangement for detecting a mechanical quantity which depends on a force emanating from the tool, and a control device which is adapted to recognize an event and/or a state of the power tool according to the detected mechanical quantity. The strain gauge arrangement is arranged on a stationary structure section coupled in a force-transmitting manner to the pivot bearing and is not arranged on the pivot bearing.

A power tool, including a support structure, a pivot bearing arranged on the support structure, a shaft mounted on the support structure via the pivot bearing, a rotatable tool coupled to the shaft, in particular a saw blade, milling cutter or grinding wheel, a strain gauge arrangement for detecting a mechanical quantity which depends on a force emanating from the tool, and a control device which is adapted to recognize an event and/or a state of the power tool according to the detected mechanical quantity. The strain gauge arrangement is arranged on a stationary structure section coupled in a force-transmitting manner to the pivot bearing and is not arranged on the pivot bearing.

A method for controlling or regulating a hand-held power tool, in particular a screwdriver, preferably a rotary impact screwdriver. The method includes: application of a first torque, in particular torque impulse, to a screw in a first direction of rotation, and application of a second torque, in particular torque impulse, to the screw, in a second direction of rotation opposite to the first direction of rotation.

An object of the present invention is to provide a tool system allowing a tool to be controlled on a work object basis before the work is started. A tool system includes a portable tool and an identification unit. The tool includes a driving unit to operate with power supplied from a battery pack. The identification unit identifies, by a contactless method, a current work object, to which the tool is set in place, out of a plurality of work objects.

An object of the present invention is to provide a tool system allowing a tool to be controlled on a work object basis before the work is started. A tool system includes a portable tool and an identification unit. The tool includes a driving unit to operate with power supplied from a battery pack. The identification unit identifies, by a contactless method, a current work object, to which the tool is set in place, out of a plurality of work objects.

A screw driving device includes: a case; a motor provided with a rotor; an output member capable of driving in rotation an element for driving an element to be screwed; a transmission connecting the rotor to the output member, the transmission including at least one additional gear train capable of being engaged/disengaged; an motor controller. The device includes an element for engaging the additional gear train, which is capable of being in at least: an engagement state in which the additional train is engaged, and a disengagement state in which the additional gear train is not engaged. A reduction ratio of the transmission between the rotor and the output member is different according to whether or not the additional gear train is engaged, the reduction ratio being greater when the additional gear train is engaged.

A ratchet tool provided, including: a driver body, including a handle and a working rod connected with the handle, at least one of the handle and the working rod being integrally formed with a first blocking structure; at least one sleeve member, being disposed around and unidirectionally rotatable about the driver body, integrally formed with a second blocking structure, at least one of the first and second blocking structures being configured as a ratcheting structure, the second blocking structure being releasably stuck with the first blocking structure in a rotation direction; wherein when there is a relative torque greater than a predetermined torque between the at least one sleeve member and the driver body, at least one of the first blocking structure and second the blocking structures deforms and the second blocking structure is slidable over the first blocking structure in the rotation direction.