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METHOD FOR CONTROLLING TENSILE STRESS OF A SHANK, SUCH AS A SCREW OR DOWEL PIN, AND DEVICE FOR CARRYING OUT SAID METHOD

  • US 20090013518A1
  • Filed: 05/25/2005
  • Published: 01/15/2009
  • Est. Priority Date: 06/02/2004
  • Status: Active Grant
First Claim
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1. A method for controlling tensile stress of a rod, such as a screw or pin, by the axial extension of said rod and the positioning of at least one retaining member, before the rod is released, such that the rod is blocked at the two ends of the useful clamping length with a residual clamping tensile force, characterized in that measurements are made which represent the elongation of the rod in the stretched state under a measured extension force and of the rod after release in relation to the rod before extension, by comparing values supplied by at least one sensor during extension and after release with a reference value supplied by this sensor before extension, and, on the basis of these data, a residual clamping force in the useful clamping length of the released rod after extension is calculated.

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