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Tension control of fasteners

  • US 4,219,920 A
  • Filed: 04/19/1979
  • Issued: 09/02/1980
  • Est. Priority Date: 04/19/1979
  • Status: Expired due to Term
First Claim
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1. A method of monitoring the tightening of joints including at least one threaded fastener, comprisingtightening the fastener;

  • sensing the torque applied to and the angle of advance of the fastener;

    terminating tightening in response to a first tightening parameter and calculating the stress in the joint;

    calculating the stress in the joint from a second tightening parameter derived from the sensed values of torque and angle; and

    comparing the calculated stress from terminating tightening with the first tightening parameter with the calculated stress from the second tightening parameter.

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