| 摘要 |
PROBLEM TO BE SOLVED: To provide a double porch having a first housing part and a second housing part and a pressure opening part installed therebetween, the pressure opening part being opened by a small force from the outside.SOLUTION: The double porch includes a first housing part and a second housing part having an outer shell sealed along an external joint line and partitioned by an internal joint line, a pressure opening part provided in a non-fusible uneven section between the upper parts or the lower parts thereof, and a disconnection line set from the center lower part of the internal joint line to a position adjacent to the pressure opening part. The first housing part and the second housing part are separated along the disconnection line, and when one housing part is wound, the pressure opening part receives pressure to open.SELECTED DRAWING: Figure 5 |
