| 摘要 |
PURPOSE:To provide a simple and strong casing by forming the side plate, top plate and bottom plate from a single metal plate, and by attaching thereto the back plate and front plate by double-seaming. CONSTITUTION:The heating chamber 1a is formed with a single metal plate in a square-shape. After attaching a separate member 14 for storing electrical parts to a side of it, the front plate 7 and back plate 11 are wound together. The L- shaped flange 15 is provided all around in front of and in the rear of the top plate 2 of the heating chamber 1. The front plate 7 and back plate 11 have flanges 7a, 11a which extend beyond the flange 15 and are slightly bent inwardly. The fastening by tight winding is complted by bending the flanges 7a, 11a together with the L-shaped flange 15, and by folding over the same. |
