APPARATUS AND METHOD FOR DETERMINING TORQUE PRESENTING DIGITAL TORQUE READOUT AND AUTOMATIC CYCLING AND TERMINATION OF WRENCH OPERATION IN A TORQUE WRENCH SYSTEM

摘要

-48-APPARATUS AND METHOD FOR DETERMINING TORQUE,PRESENTING DIGITAL TORQUE READOUT AND AUTOMATICCYCLING AND TERMINATION OF WRENCH OPERATION IN ATORQUE WRENCH SYSTEMAbstract of the Disclosure:Apparatus and a method are presented fordetermining the torque load applied to a fasteningelement by a fluid powered wrench, and displaying adigital readout of the torque. The operatingpressure of the wrench, after compensation for thetemperature of the pressure transducer, is convertedto a torque measurement by a programmedmicroprocessor and the torque value is displayed on adigital readout. The system is useable with andadjusts for wrenches of several sizes by an inputselector switch connected to the microprocessor.Apparatus and method are also presented for automaticcycling of a ratcheting hydraulic powered wrench andautomatic termination of the tightening process whena predetermined torque has been delivered to thefastening element.