| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain hole and a cap of a simple construction, where a process liquid is completely drained in a painting process, without having to reduce the work effective area of a lower-side plate reduced. SOLUTION: A welding margin 6 is provided at the end part of a lower-side plate 5, and a notch 9 is provided at a butt part of a flat part 8 against left and right side plates 3 and a back plate 4. The welding margin 6 is welded to a main body 2, and the lower-side plate 5 is fitted to the body 2, with a drain 10 of a box 1 formed with the notch 9. Related to a cap 11, a cover part 12 which covers the drain hole 10 is provided with a rib 13 making contact with the inside of the body 2 and a hooking piece 16 comprising a claw 14, for hooking with the end part of the drain hole 10. |
