Method for fastener tensioning

Details Method for fastener tensioning Method for fastener tensioning

G - Physics

05

D

341/108.1

G05D 15/01 (2006.01) B25B 23/145 (2006.01) G05D 17/02 (2006.01)

Patent

CA 1093188

7894 IR-TH METHOD FOR FASTENER TENSIONING Abstract of the Disclosure A fastener tensioning system for use with torque produc- ing power tools, such as, nut runners or the like. The system includes apparatus to rotate the fastener and deter- mine when the fastener has been driven to its yield point in tension, and, thereafter, the fastener is backed out a precise amount of rotation to establish a level of tension in the fastener below the yield point. The method of this invention improves upon the conventional turn-of-the-nut method for fastener tensioning; in that, the precise fastener rotation is started from a relatively well-known and well- defined point as opposed to a arbitrary predetermined low level of torque. In addition, the method assures by inspec- tion the proper condition of the bolt and thread prior to making the final tensioning step.

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