| 摘要 |
A power tool for tightening screw joints includes a rotation motor and a device for initiating a braking torque to the motor when, in operation, a predetermined tightening condition has been reached. A release coupling includes a first coupling part which is supported by a support shaft being rotationally connected to the motor and a second coupling part which is rotationally connected to an output shaft. The first coupling part is displaceable from a first position to a second position or positions where it is out of engagement with the second coupling part and torque transmission to the output shaft is interrupted. Applying a braking torque to the motor causes the first coupling part to be displaced from the first position to the second position or positions.
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