| 摘要 |
PROBLEM TO BE SOLVED: To dispense with adhesion and obtain a display plate only by a blanking process by meshing two fixed pieces cut in each of two floor plates extended through a bottom back bend line on the lower edge of a back plate with each other to mutually fix the floor plates, and fixing a back plate in its bent state. SOLUTION: In the case where there is one back vertical bend line 7, the respective surfaces divided by the back bend line 7 are taken as (a) back plate 8 and (b) back plate 9 from left, and in an overlap area of (a) base plate 3 and (b) base plate 4 extended from left through the bottom back bend line 2 on the lower edges of the (a) base plate 3 and (b) base plate 4, semi-circular slits curved outward are formed to provide fixed pieces. Both ends of the fixed pieces are punched in a small circle to prevent tear, and (a) fixed piece 5 and (b) fixed piece 6 are taken from left. A projecting piece 10 is extended from the floor back bend line 2 to protrude the floor plate side for the thickness of the sheet, and the projecting piece 10 is a little projected, whereby the bending angle easy to be rounded is square so that it is hard to fall backward at the completion of assembling.
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