| 摘要 |
A torque wrench is provided of the type which comprises a yieldable beam having a work-engaging head at one end and a force-applying handle at the other end. The wrench is provided with an electrical signal circuit which preferably includes a battery and a buzzer or other signalling device, both of which may be in the handle, a reference-torque contact and an adjustable selection-torque contact. These contacts are normally open but become closed by the bending of the yieldable beam when the selected torque force is reached, thereby actuating the buzzer or other signalling device.
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