Nut assembly including frame having a flange portion and opposed arms supporting a pivotable nut

A nut assembly comprising a pivotable nut having a threaded through hole and a pin on each side thereof, and a frame having a flange portion formed with a bolt hole and an opposed pair of arms extending from both sides of said flange portion, said arms each being formed with an elongated hole, said nut being formed at one end thereof with an inclined guide surface for pivoting said nut when pushed by a bolt, said nut being pivotably and slidably mounted between said arms with said pins received in said elongated holes formed in said arms,

• wherein said nut is of a longitudinally elongated cubic shape, is formed with the threaded hole extending therethrough substantially in a center thereof from one of its longitudinal sides toward its back side, and is integrally formed on said back side with a ridge having a longitudinally extending apex, and that a non-threaded hole is provided coaxially with said threaded hole where one end of said threaded hole opens at said ridge, said non-threaded hole having an inner diameter substantially equal to or greater than the root diameter of female threads formed in said threaded hole, said threaded hole and said non-threaded hole having colinear axes that intersect said longitudinally extending apex.