| 摘要 |
PROBLEM TO BE SOLVED: To permit the widening of selecting range of materials as well as the manufacturing of an inner box for a cooker with an excellent productivity without necessitating much expense. SOLUTION: An oblique cut-and-bent part 25 is formed on the jointing part 21 of a main panel 12 (the jointing part of one side inner box constituting component), while a hole 30 shorter than the actual length B of the cut-and-bent part 25 but longer than the projected length C of the cut-and-bent part against the original surface before the cut-and-bent work is formed on the jointing part of the upper panel 13 (the jointing part of the other side inner box constituting component). These components are engaged and the cut-and-bent part 25 is pressurized toward the direction of the hole 30 whereby the inner box can be manufactured by the assembling of the inner box constituting components and a plastic work.
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