| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint from which any one can easily make a blind without techniques and tools to enable many people to easily make the blind without special technique and tools and save energy, while many people spend their comfortable lives to be useful for prevention of global warming and destruction of global environment. SOLUTION: The joint has apertures 2, 3, 4, 5, 6, 7 whose top portions are closed and a through aperture 8, wherein the portion forming the foremost aperture 2 and the portion forming the rearmost aperture 8 lack the lower part and upper part respectively, and the wall 9 is formed by cutting out one half side portion from the center portion under the portion forming the apertures 3, 4, 5, 6, 7, 8 so that a part of the apertures of the middle portion is exposed as vertical long holes 3', 4', 5', 6', 7', 8' at the wall 9.
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