Patent ID: 7188549

Claim:
An axial-force-detective fastening tool, comprising: a tool body; a socket body rotatably supported with the tool body and having a nut receiver, configured to receive a nut in the nut receiver, turn the nut around an axis of the socket body, and fasten the nut to a bolt; a driver installed in the tool body, configured to drive and rotate the socket body; an ultrasonic sensor supported with the tool body, configured to be movable along the axis of the socket body, be brought into contact with a front end of the bolt in the nut receiver, emit ultrasonic waves to the bolt, and receive the ultrasonic waves reflected from the bolt, so that an axial force acting on the bolt is detected according to the emitted and received ultrasonic waves; a biasing device configured to push the ultrasonic sensor to the front end of the bolt; and an inner socket having a stopping part, nonrotatably supported with the tool body, concentrically arranged in the socket body, configured to stop the rotation of the bolt by holding, with the stopping part, an engaging part formed at the front end of the bolt, and configured to movably support the ultrasonic sensor.