To provide an improved counterweight device for a mobile lift crane.SOLUTION: A lift crane 410 comprises: a counterweight support frame 432 that is included in a rotating floor 420; a counterweight unit 435 that includes a trolley 470 and is supported on the counterweight support frame so as to be movable with respect to the rotating floor; and a counterweight moving device that moves the counterweight unit closer to or further away from a boom 422. The counterweight moving device includes at least one motor that drives a gear 474 coupled to the trolley. The gear engages a pair of teeth 436 on the counterweight support frame to move the trolley with respect to the rotating floor when the motor rotates the gear.SELECTED DRAWING: Figure 24

    【課題】改良した移動式吊り上げクレーンのカウンタウエイト装置の提供。【解決手段】吊り上げクリーン410は、回転床420に含まれるカウンタウエイト支持フレーム432と、トロリー470を含み回転床に対して移動可能な形態でカウンタウエイト支持ムレームに支持されたカウンタウエイトユニット435と、カウンタウエイトユニットをブーム422に近づけたり遠ざけたりするように動かすカウンタウエイト移動装置とを備える。カウンタウエイト移動装置は、トロリーに結合された歯車474を駆動する少なくとも1つのモーターを含み、モーターが歯車を回転させたときに歯車がカウンタウエイト支持フレーム上の1組の歯436に係合してトロリーを回転床に対して移動させるようになっている。【選択図】図24


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    Title :

    LIFT CRANE WITH MOVABLE COUNTERWEIGHT


    Additional title:

    可動のカウンタウエイトを備えた吊り上げクレーン


    Contributors:

    Publication date :

    2021-05-27


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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