| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the operating efficiency of the manufacture without lessening tightness of the closure and visuality. SOLUTION: A case is composed of a front board 21, back board 22, reverse board 23, and two lateral boards 27, 27 which together form a thin box body having one side open. A lid body comprising a top lid board 26 which closes the open side and a lid-board extension 25 which adjoins the top lid board extends from the box body. The edge of the reverse board 23 on the side of the lid body is withdrawn in position by a certain distance toward the inside from the edge of the front board 21 on the side of the lid body and the edge of the reverse board 23 on the side of the lid body forms a main hinge of the lid body. On the other hand, the top lid board 26 has an L-shaped cross section in side view and the two end parts of the top lid board are provided with triangular corners 29, 29 which can be put in sliding contact with the inner surfaces of the lateral boards 27, 27 respectively.</p> |
