Patent ID: 7644627
Filing Date: 2010-01-12
Classification: F16B,Y10T

Abstract:
1. A method of measuring a load in a fastener, comprising the steps of: providing a thread-forming fastener including a head for engagement by a tool for applying a torque to the fastener, and a body portion extending from the head and including thread-forming portions; coupling an ultrasonic transducer with the fastener, for making ultrasonic load measurements in the fastener; electrically connecting an apparatus to the ultrasonic transducer for supplying signals to the ultrasonic transducer and for receiving signals from the ultrasonic transducer; monitoring the signals received from the ultrasonic transducer, providing an accurate measurement indicative of the load in the fastener; adjusting the measurement indicative of the load to compensate for effects of heating of the fastener resulting from forming a thread in a mating component during installation; and imparting torque to the fastener and removing torque from the fastener in response to the measurement of the load in the fastener.