To provide a boom device and a crane capable of preventing a boom from falling off.SOLUTION: A crane is equipped with a boom device with a telescopic boom that can be extended and retracted in several stages. The telescopic boom includes a second boom part 22 formed in a rectangular tube shape, and a third boom part 23 formed in a rectangular tube shape and disposed inside the second boom part 22. The third boom part 23 includes a protrusion part 40 that protrudes from the lower surface of the third boom part 23. The second boom part 22 includes a receiving part 30 formed on a surface facing the lower surface of the third boom part 23 out of the inner surfaces of the second boom part 22 and having a space capable of receiving the protrusion part 40. The third boom part 23 is prevented from falling off the second boom part 22 by dropping the protrusion part 40 into the space held by the receiving part 30 when the telescopic boom is extended by displacing the third boom part 23 relative to the second boom part 22.SELECTED DRAWING: Figure 12

    【課題】ブームの脱落を防止することが可能なブーム装置とクレーンを提供する。【解決手段】クレーンが、複数段階に伸縮可能な伸縮ブームを備えるブーム装置を備え、伸縮ブームは、角筒状に形成された第二ブーム部22と、角筒状に形成され且つ第二ブーム部22の内部へ配置される第三ブーム部23を備え、第三ブーム部23は、第三ブーム部23の下面から突出する突出部40を備え、第二ブーム部22は、第二ブーム部22の内面のうち第三ブーム部23の下面と対向する面に形成され且つ突出部40を受け入れ可能な空間を有する受け止め部30を備え、第二ブーム部22に対して第三ブーム部23を相対変位させることで伸縮ブームを伸長させた状態で受け止め部30が有する空間へ突出部40が落下することで、第三ブーム部23の第二ブーム部22からの脱落を防止する。【選択図】図12


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    Title :

    BOOM DEVICE, CRANE EQUIPPED WITH BOOM DEVICE


    Additional title:

    ブーム装置、ブーム装置を備えるクレーン


    Contributors:
    WANG JIAN (author)

    Publication date :

    2024-05-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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