| 摘要 |
PURPOSE:To obviate the necessity for rivet work, reduce the total weight and cut the cost by caulking the cylindrical projection part of the supporting plate formed through drawing work into a circular hole formed on an outer plate. CONSTITUTION:A supporting plate 1 has, at its center part, a cylindrical part 2, namely the cylindrical projection part shown by a two-point chain line formed through drawing work. A circular hole for insertion of the cylindrical part 2 is formed on an outer plate 4. The cylindrical part 2 having a check valve 3 installed is inserted into the circular hole and caulked, and then the supporting plate 1 is formed integrally with the outer plate 4. |
