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    WINDMILL BLADE
    43.
    发明专利
    WINDMILL BLADE 失效

    公开(公告)号：JPS59221474A

    公开(公告)日：1984-12-13

    申请号：JP9580783

    申请日：1983-06-01

    Applicant: TORAY INDUSTRIES

    Inventor： TANAKA SEIJI ,  OGASAWARA MASASHI ,  NISHI YASUHIRO

    IPC: F03D3/06 ,  F03D1/06 ,  F03D3/00

    Abstract: PURPOSE:To prevent the broken pieces of the blade from being scattered to distant places by arranging linear materials or the like along the lenghwise direction in the cavity of the windmill blade. CONSTITUTION:A plurality of cores 2A, 2B, made by expansion molding of urethane and having the substantially same section as the section of the cavity, are provided in the cavity of the windmill blade 1 with equal intervals. A rope 3, penetrating through the cores and stretched in the lengthwise direction of the windmill blade 1, is bound by a thread 5 onto the surface of stiffening plates 4 arranged at both end surfaces of the windmill blade 1 and both binding parts are adhered by resin. The rope 3 is provided with a flexibility, meeting to the centrifugal force due to the rotation and the deflection due to the air force caused by the rotation, as well as a strength capable of withstanding against a scattering force in case the windmill blade is broken.

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