| 摘要 |
An unscrewing-preventing system is descrive, comprising, in a sequence, a screw (1) with reductions and a nut (2) with tightening chambers for stem and screw reductions, wherein the screw (1) has a cylindrical non-threaded reduction chamfered at its opposite end with respect to its head, and the nut (2) is internally composed of a threaded part and at least one smooth part for a corresponding coupling with the screw (1) and an unscrewing-preventing action obtained by a friction existing between the non-threaded parts of screw (1) and nut (2). |
