| 摘要 |
<p>A lock nut characterized in that a plurality of flexible vanes are formed by forming an elastic plate material to have a concave-shape at a central cross section such that its outer peripheral side plate portion is polygonal in shape like nut and its lower, flat plate portion is divided in a circumferential direction of a central nut hole of a nut, warping respective tips of the flexible vanes toward inside of a concave-shaped cross section to provide a nut thread in which the vane tips engages a bolt for integration therewith, and forming downwardly extending portions downwardly of roots of the respective flexible vanes in a fastening direction so that contact pressures on the downwardly extending portions cause the flexible vanes to be flattened relative to the bolt to fasten the nut.</p> |
