Patent ID: 6786690
Filing Date: 2004-09-07
Classification: F16B,Y10S

Abstract:
A locking fastener, comprising:a bolt; a washer in which a base portion has a bolt through-hole that is slightly larger than a nominal diameter of the bolt, a conical barrel member whose diameter decreases toward an upward position in a bolt axial direction is formed around said bolt through-hole so as to stand therefrom, and a continuous slit for a notched circle is formed in said base portion and said conical barrel member; and a nut in which a conical hole portion is formed over a female screw portion that is screwed with a screw portion of said bolt, said conical hole portion being constructed in a manner such that a diameter of an inner periphery of a half portion which does not face said washer is set to be smaller than that of an outer periphery of a front edge portion of said conical barrel member, a diameter of an opening of a half portion on the side which faces said washer is set to be smaller than that of an outer periphery of a root portion of said conical barrel member, a height is slightly higher than that of said conical barrel member of said washer, a tapered surface of a same inclination angle as that of said conical barrel member of said washer is formed, and a part of said conical barrel member of said washer is constructed as a thick portion which is slightly decentered from a center of a circle of said bolt through-hole.