| 摘要 |
A device for tightening screw joints, comprising a motor, a torque responsive slip clutch and an output shaft, said slip clutch comprising a coil-type friction spring which by one of its ends positively engages one of the clutch halves and which, due to torsional pretensioning, engages the other clutch half by a radially acting friction grip. An adjustable auxiliary torsion spring is arranged in parallel with said friction spring in such a way as to increase or decrease the friction grip of the latter relative to said other clutch half and, thereby, increase or decrease the output torque level of the device. The device includes an adjusting mechanism for setting the torsion load of said auxiliary torsion spring.
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