Measuring and testing – Dynamometers – Responsive to torque
Patent
1980-04-18
1982-05-11
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
81479, 200 56R, 340688, B25B 23142
Patent
active
043287093
ABSTRACT:
A device is used for indicating a preset torque on a conventional torque wrench. The device has a front part and a back part, which are held together by a U-shaped bracket. The bracket serves to secure the front part and back part of the device on opposite sides of the torque wrench's dial. The device includes a battery which is electrically connected to a copper plate on the back part of the device. This copper plate electrically connects to the pointer of the torque wrench by way of the indicating plate and rod. When the pointer is deflected an amount determined by the positioning of the device on the indicating plate, the pointer will contact and electrically connect to a resilient terminal on the device. This contact will connect the battery to a circuit in the device, causing the device to generate an audible and turn on a light. A test switch is included and used for bypassing the pointer arm in determining that the circuit is still operative. An additional terminal is used for indicating that the preset amount of torque has been exceeded. This overtorque terminal is electrically connected to the pointer only when the pointer has been deflected past the preset amount. When this happens, the circuit will generate an audible signal distinctively different from the audible signal which occurs without the overtorque terminal being electrically connected to the pointer.
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