Patent ID: 6609867
Filing Date: 2003-08-26
Classification: F16B,Y10S

Abstract:
An anti-loosening nut assembly comprising an upper nut and a lower nut, one of the nuts having around a threaded bore thereof a protrusion shaped to fit into a recess that is formed in the other nut around a threaded bore thereof, the protrusion of the one nut having an outer periphery tapered such that its diameter decreases outwards in axial direction towards the other nut, and one of the outer periphery of the protrusion and an inner periphery of the recess being formed slightly eccentric with respect to the corresponding threaded bore, with the other of the peripheries being formed coaxial with the corresponding threaded bore,wherein the upper nut comprises at least one lateral lug that protrudes sideways therefrom so as to bear against a lower end portion of a fastening tool such as a box wrench and thereby limit axial movement of a fastening tool such as a box wrench.