Patent attributes
A torque-indicating wrench comprises a wrench body including a head to engage and turn a workpiece, and a stem having two outer longitudinal wall segments. A strainable body made of a material with an elasticity modulus smaller than that of the stem has a gage carrying major wall which is disposed on the outer longitudinal wall segment such that the strainable body is stretchable relative thereto. A restraining member is disposed to restrain the strainable body from moving away from the outer longitudinal wall segment while permitting a stretching movement of the strainable body. A strain gage unit is attached to the gage carrying major wall to detect change in resistance values corresponding to stretching deformation of the strainable body for processing by a processing circuit so as to obtain a value of torque applied to the workpiece.
