| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint nut for ceiling allowing easy checking of fastening, excellent in the strength, and manufacturable at low cost. SOLUTION: The joint nut 1 for ceiling is formed from a round pipe into a ring shape and provided with a pair of threaded holes 2 on the two sides about the axis. Because of ring shape, the joint nut 1 allows easy checking of fastening of an anchor bolt 4 with a hung bolt 5, and also excels in the strength owing to its continued structure in one string. This can be manufactured from metal pipe through one series of processings using a machine tool such as a turret lathe, which allows suppressing the cost.
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