Patent ID: 8156820
Filing Date: 2012-04-17
Classification: B23P,B25B,F16B

Abstract:
1. Device for tightening a first nut placed on a threaded end, which threaded end extends through a hole in at least a first fixed body and is screwed into a threaded hole in a second fixed body, or extends through a hole in a second fixed body and is screwed into a second nut, which device is provided with gripping means co-acting with the first or the second nut, wherein processing and control means are provided for processing a signal generated by sensor means subject to the force exerted in axial direction of the threaded end on the surface of the first fixed body by the bolt head or the first nut, or on the surface of the second fixed body by the second nut, and for controlling the device in a manner such that the first or the second nut is tightened subject to the force exerted in axial direction of the threaded end on the surface of the first fixed body by the first nut or on the second fixed body by the second nut, which sensor means are received in an annular body arranged around the threaded end between the first nut and the first fixed body or between the second nut and the second fixed body, wherein the sensor means are received in an annular part of an assembled nut which is adapted for tightening of this nut in axial direction of the threaded end in the absence of a torque exerted on the threaded end.