PURPOSE: To make a torque wrench convenient for a tightening operation so that the operation can be achieved easily and efficiently.
CONSTITUTION: A head 2 is provided to which a fastener drive 1 is freely rotatably supported and which has a ratchet mechanism causing stepped rotation of the fastener drive 1 in a predetermined direction by rotating back and forth relative to the drive 1, and an air drive source 5 is provided which is connected to the head 2 and which causes stepped rotation of the fastener drive 1 in the predetermined direction via the ratchet mechanism. Further, a handle 6 is provided which is connected to the head 2 to allow the operation of rotating the head 2 back and forth relative to the fastener drive 1 to cause stepped rotation of the fastener drive 1 in the predetermined direction via the ratchet mechanism, and which is equipped with an idle mechanism which, when torque at the operation for the back-and-forth relative rotation exceeds a predetermined value, gives the operation a predetermined play.
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CHIBA NOBUKATSU
NAGAKI YASUHARU
HONMA MITSUHARU
NAGAKI SEIKI KK