| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus which does not mar external appearance when vertical and horizontal muntins are coupled together. SOLUTION: The vertical and horizontal muntins 1, 2 each formed of a square cylindrical body, are partially cut out to form notches 3, 4. Specifically, the notch 3 is formed by partially cutting out a facing surface piece 1a opposed to a facing surface piece 2a of the horizontal muntin 2, and side surface pieces lb, 1b which are adjacent to the facing surface piece 1a and opposed to each other. The notch 4 is formed by partially cutting out the facing surface piece 2a, and side surface pieces 2b, 2b which are adjacent to the facing surface piece 2a and opposed to each other. A projection 5 for engaging with an inner side of the horizontal muntin 2 when the notches 3, 4 are fitted into each other, is formed on the vertical muntin 1. Further, the projection 5 is formed by pressing an intermediate location of each of the side surface pieces 1b, 2b, of the vertical muntin 1, which is extended from the notch 3 in the depth direction from the inside, and an engaged portion 6 with which the projection 5 engages is protruded on an internal surface of the side surface piece 2b of the horizontal muntin 2.
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