Patent ID: 7192233
Filing Date: 2007-03-20
Classification: F16B

Abstract:
1. A looseness preventive nut for threadedly engaging with a bolt, said nut being configured in a non-engaging state so that one and only one uniformly thick plate-shaped lateral groove extending in a radial direction of said nut perpendicular to a centerline of said nut such that at least a part of a threaded portion is cut, and extending beyond the centerline of said nut, wherein the centerline of said nut aligns with a moving direction of said bolt when said bolt is being threaded into said nut; a neutral plane of said lateral groove is perpendicular to the centerline of said nut, said lateral groove is formed at a position slightly lower than a substantially middle point of said nut in the height direction, one flat bearing surface of said nut is parallel with the radial direction and the other one bearing surface of said nut is an inclined bearing surface having an inclination angle (θ) of 1° to 2° towards said flat bearing surface measured from one edge of said nut to an opposite edge of said nut across the centerline of said nut; and the extension of a neutral line of said lateral groove and the extension of a neutral line of said inclined bearing surface intersect each other.