| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent breakage at the time of removing an inner case from an outer case to improve removal operation by providing a plurality of holes which are opened by applying pressure to a tab from opposite ridges on a top plate of the inner case. SOLUTION: When a product is necessary, a lid of an outer case C is opened. Then a part of U-shaped perforations is pressed to push down a hole forming piece 3b to open a hole. Since a part below the hole forming piece 3b is hollow, the pushed piece 3b may not come into a head of the product at the time of opening the hole, so that the product may not be damaged. By lifting this part with a finger inserted in it, an inner case B is taken out of the outer case C. At the time of taking out the inner case B, since a fold line of the hole forming piece 3b is located on a ridge of a top plate, a point of application of force functioning to the top plate of the inner case B is close to a side of the inner case, so that force functioning to the top plate is largely dispersed to a perpendicular side. Thus the top plate is not likely to flex nor be broken.</p> |
