Patent ID: 7077255

Claim:
A pneumatic power nut runner comprising: a rotation motor; a drive train connecting the motor to an output shaft including a torque responsive release clutch and a disengageable torque non-responsive clutch; wherein the release clutch comprises a driving clutch half and a driven clutch half; wherein the torque non-responsive clutch comprises an axially immovable clutch half and an axially displaceable clutch half, and an activating mechanism including a latch element which is movably supported on either one of said driving and driven release clutch halves for displacement in a direction transverse to the rotation axis of the clutch upon relative release movement between the driving and the driven release clutch halves; wherein a first cam means is arranged between one of said driving and driven release clutch halves and the latch element for accomplishing said transverse displacement of the latch element; and wherein a second cam means is arranged between the latch element and the axially displaceable clutch half of the torque non-responsive clutch for accomplishing disengagement of the torque non-responsive clutch at release of the release clutch and a consequent transverse displacement of the latch element.