Importance

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Abstract

A torque wrench for additional tightening inspection can measure a precise torque value by simply tightening the tightening bolt additionally. When the inspection bolt is tightened, the rotation of the wrench is detected before the rotation of the bolt due to the torsion of the wrench itself. The intersection P between a torque gradient line M obtained at that time and a torque gradient line N of a rotating state after the rotation of the bolt makes a measuring point. The torque value at this intersection P is determined to obtain a torque measurement. Here, the torque gradient line N is obtained by connecting several points each corresponding to a torque value of 90% of the torque value TA at the intersection PA with a referential torsional torque gradient line L.

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First Claim