| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat insulation lunch box in which the top surface of a lid member, which covers the upper part of a food container in the lowest stage, is formed like a spherical surface and the food container in the upper stage can be put on this top surface with good stability. <P>SOLUTION: The top surface 41 of a heat insulation lid 12 of the vacuum heat insulated structure of a first food container 2 is formed in the form of a spherical surface which swells a little upward centering around a center line 29, and a second food container 3 is put on the top surface 41. A first downward rib 35 facing downward is provided at the center of the bottom 33 of the second food container 3 and a second downward rib 36 is provided on the outside thereof. An upward projection 32, which is engaged by insertion into the first downward rib 35, is provided at the center of the top surface 41. Further, a gap 42 is formed between the downward rib 35 and the top surface 41 and the rib 36 is in contact with the top surface 41. By engaging the rib 35 with the upward projection 32, the second food container 3 put on the top surface 41 is prevented from slipping off. By protecting the side of the lower end 40 of the rib 35 by the gap 42, the scratch or the like of the rib 35 can be prevented. <P>COPYRIGHT: (C)2012,JPO&INPIT |
