| 摘要 |
A fan having a hub, a plurality of arms extending radially outwardly of the hub, blade structures, one secured to each arm, each comprising resilient trailing portions which decamber as rotational speed increases, and a reinforcing cap secured to each arm and blade which has a decamber-limiting portion extending partially coextensively with the trailing blade portion at an acute angle thereto, and two integrally formed upstanding lips, one disposed along each opposed radially spaced edge of the cap and of the decamber-limiting portion thereof which reduce metal fatigue in the cap.
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