| 摘要 |
PURPOSE:To form a bottom plate for a case to a flat tabular shape, and to facilitate even polishing by parting the bottom plate and peripheral side plates, separately manufacturing these bottom plate and side plates and fitting and combining projections and grooves in these bottom plate and side plates. CONSTITUTION:A bottom plate 1 is a tabular article, the periphery thereof has a groove 21, while side plates 2 are tabular articles, lower surfaces thereof have projections 22 fitted into the groove 21 in the bottom plate 1. The projections 22 in the four side plates 2 are engaged with the peripheral groove 21 in the bottom plate 1 in succession, and combined, thus manufacturing a baking case. The base 11 of the bottom plate 1 differs from the base of a board- shaped bottom plate and is the same as the surface of the tabular article, thus extremely facilitating the polishing of the surface of the base 11. The groove is formed through cutting, but width thereof is narrowed, and cut surfaces need not be polished, thus easily manufacturing the baking case easily at low cost. |
