| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical firework composed by improving weak points of a conventional cylindrical firework where the firework itself is bulky and inconvenient to handle although it is small in size, contains a small quantity of explosive and blasts out a small flame, the blasted-out flame is constant and monotonous from the start to the end of the blasting out, and the size of the flame can not be increased. SOLUTION: The whole or an upper end of a conventional firework formed into a cylindrical shape is formed into a nearly conical shape to eliminate its upper lid and gas pressure is prevented from acting on the upper lid by constituting it like that; a large cylindrical firework is formed by eliminating the risk of damage caused by it; and a large flame can be blown up by increasing the gas pressure in the cylindrical body. COPYRIGHT: (C)2007,JPO&INPIT
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