Nut assembly for fastening an instrument to a member to the back of which hands cannot reach, has ridge with hole having inner diameter equal to or greater than that of female threads of nut threaded hole

摘要

A nut (5) is pivotally and slidably mounted between the opposed arms of a frame. A ridge (14) at the back side of the nut has a hole (21) coaxial with the threaded hole (2) of the nut. The ridge hole has an inner diameter substantially equal to or greater than the root diameter of the female threads of the threaded hole.