Patent ID: 6761229
Filing Date: 2004-07-13
Classification: B25B

Abstract:
A retrofit system, for an impact tool of the type comprising a body and an output shaft adapted to be coupled to a fastener, said retrofit system comprising:a shaft extension having a first end and a second end, said first end being adapted to be coupled to the output shaft and said second end being adapted to be coupled to the fastener; a torque transducer coupled to said shaft extension; and means for processing the output of the torque transducer to obtain torque on the fastener, wherein said means for processing comprises: means for generating a torque pulse signal based on the output of the torque transducer; means for subtracting a torque signal from the torque impulse signal to generate a difference signal; means for integrating the difference signal to obtain a fastener angular velocity signal; means for integrating the velocity signal to obtain a fastener angular displacement signal; and means for converting the angular displacement signal to the torque signal representing torque on the fastener.