Patent ID: 8261421
Filing Date: 2012-09-11
Classification: B23P,B25B,G01L,Y10T

Abstract:
1. A method of establishing and checking the axial preload in a tightening portion of at least one shank of the screw or stud type, the method comprising the steps of: providing a shank, a shank gripper member and a tensioner; disposing the tensioner in a rest configuration and bringing the shank gripper member into contact with the tensioner in said rest configuration prior to establishing the preload; tensioning the extension portion of the shank having the tightening portion using the shank gripper member and the tensioner to establish a preload; returning the tensioner to said rest configuration after establishing the preload, the tensioner in said rest configuration being pressed toward one end of the extension portion; and comparing a difference between an initial length and a final length of the extension portion with a threshold.