Anti-loosening device for drum tension bolt

摘要

An anti-loosening device includes a main body and an O-ring, which serves as an elastic member attached to the main body. The main body includes a fitting hole, into which the bolt head of a tension bolt is to be fitted, and eight holding sections, which laterally hold the bolt head fitted in the fitting hole. The holding sections are configured to open about the center line of the fitting hole and to laterally hold the bolt head fitted in the fitting hole.