Method and apparatus for measuring the residual tension in a stud or a bolt
Patent 4333351 Issued on June 8, 1982. Estimated Expiration Date: 
February 25, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 25, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3382709 3759090 3969960 InventorApplicationNo. 06/124301 filed on 02/25/1980US Classes:73/761, Threaded fastener stress411/14Including gauge meansExaminersPrimary: Ciarlante, Anthony V.Attorney, Agent or FirmInternational ClassesG01L 5/24 (20060101)G01L 1/25 (20060101) AbstractA method and apparatus for determining the residual force or tension in a bolt or stud is presented. The bolt or stud in a previously tightened joint is stressed by the imposition of a pulling force, the resulting strain on the bolt is measured to develop a force-strain relationship, and the measured force-strain relationship is compared to previously determined force-strain relationships for the joint to determine the residual force or tension in the bolt or stud. | |
