A reaction arm mounting assembly comprises a first part and a second part, the first part being configured for attachment to a power tool and the second part is mounted on the first part. The mounting of the second part on the first part: permits sliding motion between the first and second part along an axis common to the first and second parts in a first sliding region and prevents rotation between the first and second member in the first sliding region; and permits rotation between the first and second members in a second sliding region.

A power machine tool (1) of the present disclosure includes a housing (10) and a control board (20), a power device (30), a bearing set (40), a transmission mechanism (50) and a torque axle (60) disposed in the housing (10). The power device (30) is disposed in the housing (10) via the bearing set (40) and transmits a torque via the transmission mechanism (50). The torque axle (60) is connected to a rear side of the power device (30) and rotates with the power device (30). In addition, a torque sensor (2) is arranged on the rear side of the power device (30) to detect the torque of the power machine tool.

A power machine tool (1) of the present disclosure includes a housing (10) and a control board (20), a power device (30), a bearing set (40), a transmission mechanism (50) and a torque axle (60) disposed in the housing (10). The power device (30) is disposed in the housing (10) via the bearing set (40) and transmits a torque via the transmission mechanism (50). The torque axle (60) is connected to a rear side of the power device (30) and rotates with the power device (30). In addition, a torque sensor (2) is arranged on the rear side of the power device (30) to detect the torque of the power machine tool.

A control method is provided for a hand-held power tool (1), which includes a motor (5) for rotationally driving a tool holder (2) about a working axis (12), including the following steps: detecting a rotary motion of the hand-held power tool (1) about the working axis (12); detecting a rotary or pivoting motion about a transverse axis (18) extending transversely to the working axis (12); triggering a safety function for reducing the torque output of the motor (5) when the rotary motion about the working axis (12) exceeds a limiting value, and suppressing the safety function when the rotary or pivoting motion about the transverse axis (18) is greater than a threshold value.

The present disclosure relates to a metal finishing tool comprising a tool body having a handle section, a motor housing, and an L-shaped support arm that extends laterally from the motor housing to an elbow and longitudinally from the elbow to an arm end. The metal finishing tool further includes a motor and a drive train located within the tool body that are operatively coupled to drive a spindle and rotatable drum, which are coupled to the support arm. The spindle extends from a spindle base proximate to the arm end of the support arm to a spindle end that is free, and the spindle's axis intersects the motor axis of the tool body. The spindle and drum are balanced across the motor axis of the tool, thereby minimizing any torque load exerted by the rotating drum when the tool is in use.

A reaction arm mounting assembly comprises a first part and a second part, the first part being configured for attachment to a power tool and the second part is mounted on the first part. The mounting of the second part on the first part: permits sliding motion between the first and second part along an axis common to the first and second parts in a first sliding region and prevents rotation between the first and second member in the first sliding region; and permits rotation between the first and second members in a second sliding region.

A power screwdriver has a gear housing with forwardly extending output shaft and a peripheral external spline with teeth lying on a first diameter. The gear housing has a peripheral groove with groove bottom arranged rearward of the external spline. The groove bottom lies on a second diameter smaller than the first diameter. The support bracket has a fastening portion with an annular fastening flange with internal spline and a support foot arranged laterally offset from the output shaft and placed against an external counter bearing for diverting reaction torques. Internal and external splines cooperate to rotationally fix the support bracket relative to the gear housing. A locking element on the fastening flange can assume a blocking setting or a release setting. In the blocking setting, the locking element extends partially or completely into the groove and locks the support bracket to the gear housing in longitudinal direction.

A power tool includes a housing, an auxiliary handle, and a vibration damping assembly. The auxiliary handle includes a front end and a gripping portion. The vibration damping assembly includes a mass member and an elastic element. The auxiliary handle further includes an end cap arranged at a rear end of the gripping portion where the rear end is far away from the housing relative to a front end of the gripping portion. An accommodating cavity for accommodating the vibration damping assembly is formed around the gripping portion. The elastic element is arranged between a mass member and a cavity wall of the accommodating cavity. A ratio of a natural frequency W1 of the vibration damping assembly to a rotation frequency W2 of an output shaft in rotation is greater than or equal to 0.7 and less than or equal to 1.3.

A control method is provided for a hand-held power tool (1), which includes a motor (5) for rotationally driving a tool holder (2) about a working axis (12), including the following steps: detecting a rotary motion of the hand-held power tool (1) about the working axis (12); detecting a rotary or pivoting motion about a transverse axis (18) extending transversely to the working axis (12); triggering a safety function for reducing the torque output of the motor (5) when the rotary motion about the working axis (12) exceeds a limiting value, and suppressing the safety function when the rotary or pivoting motion about the transverse axis (18) is greater than a threshold value.

A power tool includes a housing, a motor, an output shaft, a working head, a transmission assembly, an auxiliary handle, and a vibration damping assembly. The auxiliary handle includes a front end mounted at a position of the housing adjacent to the working head, and further includes a gripping portion extending along a center line. The vibration damping assembly includes a mass member and an elastic element. The auxiliary handle further includes an end cap arranged at a rear end of the gripping portion where the rear end is far away from the housing relative to a front end of the gripping portion. An accommodating cavity for accommodating the vibration damping assembly is formed around the gripping portion when the end cap is combined with the gripping portion. The elastic element is arranged between the mass member and a cavity wall of the accommodating cavity, and a ratio of a natural frequency W1 of the vibration damping assembly to a rotation frequency W2 of the output shaft in rotation is greater than or equal to 0.7 and less than or equal to 1.3.