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Tension control of fasteners

  • US 4,179,786 A
  • Filed: 06/02/1978
  • Issued: 12/25/1979
  • Est. Priority Date: 08/09/1976
  • Status: Expired
First Claim
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1. Apparatus for tightening seriatim a multiplicity of substantially identical joints having components including at least one threaded fastener to substantially the same final desired stress value, below the yield point of any component that can be correlated with stress, appearing in the fastener, comprisinga powered instructable tool, capable of terminating tightening in response to an instruction which varies from one fastener to the next, for applying torque to the fastener and tightening the same;

  • means for sensing the torque applied to the fastener at various angles of advance;

    means responsive to the torque and angle sensings for determining, while tightening below the yield point of any joint component that can be correlated with stress, a tightening parameter value, variable from one fastener to the next, sufficient to tighten each fastener to the final desired stress value; and

    means for instructing the tool to terminate tightening of each fastener in response to the determined tightening parameter value.

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