| 摘要 |
A framework for an electrical switchboard comprises four angled uprights, and top and bottom angled crossbars. The uprights and crossbars each have the same cross section and are formed of sheet metal folded into four parts. The first part is contiguous with and perpendicular to the second part having the same width as the first part. The third part is narrower than the first part and is contiguous with and perpendicular to the second part, and is also contiguous with and perpendicular to a fourth part. The first and third parts are located on the same side of the second part, while the second and fourth parts are located on opposite sides of the third part. |
