| 摘要 |
<p>PROBLEM TO BE SOLVED: To disperse stress generating in a blade part and to improve intensity of the blade part further, in respect to a ceiling fan.SOLUTION: A ceiling fan includes a plurality of reinforcement parts 23 which extend from a root part 12 to the middle of a vane part 13, and in which a horizontal cross-sectional shape is a concave shape. An end part on the root side of the vane part 13 of a second dent part 22 is located closer to a tip of the vane part 13 as heading toward an upstream side 11c from a downstream side 11b. A dimension from an end part on the downstream side of the blade part 11 toward the upstream side at the root side of the vane part 13 of the second dent part 22 is larger than the dimension from an end part of the upstream side 11c of the blade part 11 toward the downstream side 11b at a first dent part 21. The length of the reinforcement part 23 becomes longer as heading toward the upstream side 11c from the downstream side 11b, and also a dimension of the reinforcement part 23 in a rotational direction 11a of the blade part 11 at the vane part 13 is smaller in the upstream side 11c than in the downstream side 11b.</p> |
