| 摘要 |
PURPOSE: A method for manufacturing a parasol with no umbrella ribs is provided to prevent damage(corrosion), make transportation and storage easier because it can be folded compactly and consider an effective product cycle. CONSTITUTION: Heat treatment or scratching is performed on a disc material along a line shown so as to fold a diagonal line(1) and a diagonal line of an inner square(3). The inner square(3) is also heat-treated or scratched so as to be folded. Then, by die-cutting a fourth of a regular square, i.e., a left bottom face, excepting an adhesive surface(7) and bonding an awning(4) and an awning(6), an equiangular triangle dome is formed. At this time, when an iron supporting part(10) is bonded to the adhesive surface(7), awnings are formed on the lower bases of three side-equiangular triangular dome and are used as a parasol by standing a pillar on a pillar supporting drum(8).
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