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TIGHTENING DEVICE FOR AUTOMATICALLY TIGHTENING BOLTS AND THE LIKE

  • US 3,693,726 A
  • Filed: 09/17/1970
  • Issued: 09/26/1972
  • Est. Priority Date: 09/17/1970
  • Status: Expired due to Term
First Claim
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1. A tightening device for automatically tightening the threads of a threaded connection, which threads are adapted to be tightened in such a manner that a yielding of the material occurs in the parts containing the threads, characterized in that the device includes measuring means operable to determine the approach to the yield point by measuring the change of the tightening torque in dependence on the change of the relative rotation of the threads, and means operatively associated with said measuring means for turning off the tightening device when the yield point is substantially reached.

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