BOLT FOR MOUNTING IN DEAD OPENING Russian patent published in 2000 - IPC

FIELD: machine engineering, possibly locking of joints operating in conditions of high and long-period vibration. SUBSTANCE: bolt includes head with cavity, threaded stem with main thread, through axial hole with additional thread in stem, locking screw mounted in hole and fixing member placed in head of bolt. Additional thread is made on part of stem length. Locking screw has faceted head, threaded portion, cylindrical portion and thrust cone. Springy washer is placed between head of screw and bottom of cavity of bolt head. There is cross hole in head of screw; diametrical holes are provided in head of bolt. Fixing member bent by means of plastic deformation is arranged in two mutually opposite diametrical openings and it is also placed in hole of screw head. Holes in head of bolt may be in the form of grooves. Head of screw is higher than end face of bolt head by value no less than thickness of socket-type nut wrench. Additional thread in stem of bolt and thread of locking screw are made along their portions at side of head. EFFECT: lowered number of operations and tool kinds at mounting bolt, enhanced reliability of locking. 4 cl, 7 dwg