| 摘要 |
PURPOSE:To reduce manufacturing cost and prevent the inflow of air from a clearance of a cut edge in an inner part of a side plate produced when the side plate is bent in the shape of v. CONSTITUTION:When a side plate 30 is bent in the shape of v, a cut edge 32 is produced, and turned in an inner side of the side plate to which an overlapping unit 33 is installed so that they may be overlapped. |
