| 摘要 |
PURPOSE:To fix the flange part and cover to improve quality by inserting a bar body being formed with the tapered surface which is widened toward the end into a rivet and expanding the other end toward the outside in the radius direction by applying a force toward the one end from the other end of rivet. CONSTITUTION:A cylindrical rivet 4 having a protrusion 4a protruded toward outside of radius direction from the holes bored at the one end is inserted into said hole 11a formed at the flange portion 1a of main body tank 1 and the hole 2a formed at the cover 2. Next, the flange portion 1a and cover 2 are fixed by expanding the other end of rivet toward external side of radius direction by applying a force by pulling and pressing, in the direction toward the one end from the other end of rivet 4, a bar body 5 which is inserted into said rivet 4 and is formed with the tapered portion 5a widened toward the end having the diameter larger than the internal diameter of rivet. |
