| 摘要 |
The present invention provides a locking device for preventing loosening that facilitates a locking operation for preventing loosening of a nut coupled to a bolt and can loosen a nut easily even if the helical ridge of a bolt has been contaminated. For the purpose, the locking device composed of a bolt and a nut according to the present invention comprises: a bolt having a coupling groove in which a helical ridge is removed from the surface of a helical ridge at a constant angle of rotation; a nut having a plurality of coupling holes punched on an outer circumference surface so that one among the coupling holes can correspond to the coupling groove; and a coupling member inserted through the coupling hole to engage with the coupling groove. The coupling holes are punched toward the axis of the bolt to be perpendicular to the coupling groove. The coupling member is a headless wrench bolt being screwed along an internal thread formed on the coupling hole. The coupling member is composed of an elastic pin having one side end longer than the other and spread outward at ordinary times to insert and fix both ends thereof in the coupling hole placed on the coupling groove and the adjacent coupling hole respectively. As configured above, a locking operation for preventing loosening of a nut coupled to a bolt is facilitated and a nut can be loosened easily, even if the helical ridge of a bolt has been contaminated. |
