| 摘要 |
A tightening torque measuring unit ( 4 ) has an inner shaft ( 31 ) connectable to a first output shaft ( 12 ) of a tightening device main body ( 1 ) and an outer shaft ( 32 ) connectable to a second output shaft ( 13 ) of the body. The inner shaft ( 31 ) is provided with a tightening socket ( 21 ), and the outer shaft ( 32 ) with a reaction force receiver ( 22 ). The outer shaft ( 32 ) has strain gauges ( 47 ), and an indicator ( 5 ) for converting an amount of strain detected by the gauges into a corresponding tightening torque value. Since the reaction force receiver ( 22 ) can be attached to the measuring unit ( 4 ), the tightening reaction force is prevented from acting to knock down the receiver ( 22 ), enabling the unit ( 4 ) to measure tightening torque, with the device main body ( 1 ), the measuring unit ( 4 ) and the socket ( 21 ) positioned in alignment with the axis of the nut to be tightened.
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