Patent ID: 9604329
Date: 2017-03-28
CPC Classifications: B23P

Claim:
1. A tightening system for tightening a fastening member, the system comprising: a driving section which produces torque for tightening the fastening member; an extension bar which is coupled to the driving section and rotated by the torque; a spindle to which the torque is transmitted via the extension bar and which is connected to the extension bar such that the spindle moves forward or backward in a rotational axis direction of the extension bar with respect to the extension bar; a socket which is provided at a tip of the spindle and engages in the fastening member; a spindle case which houses the spindle and makes helical spline engagement with the spindle along a rotational axis direction of the spindle; an outer case which houses the spindle case; and a switch for switching between a state where the spindle case is held to the outer case and a state where the spindle case is separated from the outer case, wherein the switch is an electromagnetic clutch which is integrally mounted in the outer case,