THREADED INSERT FOR SETTING IN DUMMY HOLE OF THREE- LAYERED STRUCTURE Russian patent published in 1996 - IPC

FIELD: mechanical engineering. SUBSTANCE: threaded insert is made up as a cylindric housing with the axial step opening. The height of the top step is 3.0-4.0 mm and its thickness is 0.7-0.9 of the thickness of the wall of the bottom step. A bore is provided at the bottom part of the top step. The width of the bore is 25-40% of the width of the top step. The height of the bore is 1.2-1.5 mm. The bottom step is threaded. The insert is mounted in the dummy hole made in the three-layered structure and a cold stamping is then performed. Being expanded in radial direction the insert forms a toroidal surface. The toroidal surface locks the insert in the structure. EFFECT: enhanced reliability. 5 dwg