| 摘要 |
PROBLEM TO BE SOLVED: To provide an unbulky cracker capable of improving strength of a front end part of a cylinder body. SOLUTION: In the cracker, a lid is provided at a front end opening of the cylinder body 1 structured from a sheet becomes a released state by explosion of an explosive 4 in the cylinder body. The lid is structured by a pair of flaps 10, 11 formed from a front end edge of the cylinder body 1 folded at folding lines 20, 21 and overlapped. The front end part of the cylinder body 1 is formed in a flat shape of which short axis is in a predetermined direction. In the plurality of flaps 10, 11, a tip end 10a of the flap 10 which is positioned inside supports an inner surface of the cylinder body 1 and works as a strut for an external force in the short axis direction working from a side. COPYRIGHT: (C)2007,JPO&INPIT
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