To provide a crane comprising a lifting body comprising a boom and a gib coupled to a tip end part of the boom, capable of preventing overturn of the crane and reducing a load applied to an operator in a lodging work, when releasing a moment limiter function and lodging the lifting body on the ground.SOLUTION: A crane 1 comprises an upper turning body 4, a boom 16, a gib 18, and an operation regulation part 703. The operation regulation part 703 can be switched between a normal operation mode and a lodging permission mode of the crane 1. The operation regulation part 703 regulates a lifting operation of the boom 16 and an erecting operation of the gib 18 when a gib boom angle condition which is established when a gib offset angle θm which is an angle defined by an extension of a center line of the boom 16 and a center line of the gib 18 is larger than an offset limit angle θs which is formed of a preset acute angle, is not established in executing the lodging permission mode.SELECTED DRAWING: Figure 1

    【課題】ブームと当該ブームの先端部に接続されたジブとを含む起伏体を備えるクレーンにおいて、モーメントリミッタ機能を解除して起伏体を地上に倒伏させる際に、クレーンが転倒することを防止し倒伏作業における作業者の負担を低減する。【解決手段】クレーン1は、上部旋回体4と、ブーム16と、ジブ18と、動作規制部703と、を備える。動作規制部703は、クレーン1の通常作業モードと倒伏許容モードとの間で切換え可能とされる。動作規制部703は、ブーム16の中心線の延長線とジブ18の中心線とによって画定される角度であるジブオフセット角度θmが予め設定された鋭角からなるオフセット限界角度θsよりも大きい場合に成立するジブブーム角度条件が、倒伏許容モードの実行中に成立していない場合、ブーム16の起伏動作およびジブ18の起立動作を規制する。【選択図】図1


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    Title :

    CRANE AND POSTURE CHANGE METHOD OF CRANE


    Additional title:

    クレーンおよびクレーンの姿勢変更方法


    Contributors:

    Publication date :

    2020-01-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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