| 摘要 |
A pneumatic power nut runner with a rotation motor which is connected to a drive train including a torque responsive release clutch ( 10 ) and a disengageable torque non-responsive clutch ( 11 ), a pressure air inlet valve ( 12 ), and an activation mechanism ( 49, 50 ) for automatic power shut-off at the attainment of a desired maximum torque level. The activation mechanism ( 49, 50 ) comprises a transversely displaceable latch element ( 49 ) provided with a blind bore ( 54 ) for permitting closure of the inlet valve ( 12 ) and a depression ( 55 ) for allowing engagement of the torque non-responsive clutch ( 11 ), wherein a transverse displacement of the latch element ( 49 ) at the attainment of the desired torque level results in a freeing of the inlet valve ( 12 ) for displacement toward closed position and a forcing of the torque non-responsive clutch ( 11 ) out of engagement.
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