Patent ID: 7946794
Filing Date: 2011-05-24
Classification: F16B

Abstract:
1. A quick fastening nut: comprising: a circular base and a hexagonal body arranged coaxially with the circular base, and a coaxial non-circular through hole which extends through the hexagonal body and the circular base, which has a main segment and a gradation in the vicinity of the circular base that defines an expansion having arched internal radial inwardly extending protuberances which are configured to facilitate initial connection of the nut to a threaded member and a cutting of a thread in a wall portion of the through hole, wherein the main segment of the non-circular through hole has an essentially triangular cross-section as taken normally to an axis of the through hole, wherein the essentially triangular cross-section of the main segment of the non-circular hole has three straight sides and three rounded corners which each respectively merge smoothly with two of the straight sides, and wherein the three rounded corners each have a center of curvature which is coincident with the axis of the through hole and orbit around the threaded member when the nut is screwed onto the threaded member; and wherein the protuberances are positioned radially outward of an imaginary line drawn between the ends of each of the rounded corners of the main segment which has the essentially triangular cross-section.