A lift crane includes a carbody and movable ground engaging members mounted on the carbody. A rotating bed is rotatably connected to the carbody and includes a counterweight support frame including a rack coupled directly to a lower surface of the rotating bed. A boom is pivotally mounted to the rotating bed. A counterweight unit includes a trolley, the counterweight unit being in a movable relationship with respect to the rotating bed. A counterweight unit movement device is configured to move the counterweight unit toward and away from the boom. Other embodiments include a counterweight support beam movably connected to the rotating bed, the counterweight support beam including another rack coupled to a lower surface of the counterweight support beam. A counterweight support beam movement device is connected between the counterweight support beam and the counterweight support frame.

    L'invention concerne une grue de levage comprenant une carrosserie et des éléments mobiles venant en contact avec le sol montés sur la carrosserie. Une superstructure rotative est raccordée rotative à la carrosserie et comprend un cadre de support de contrepoids comprenant une crémaillère accouplée directement à une surface inférieure de la superstructure rotative. Une flèche est montée pivotante sur le plateau rotatif. Une unité de contrepoids comprend un chariot et est en relation mobile par rapport à la superstructure rotative. Un dispositif de déplacement d'unité de contrepoids est conçu pour déplacer l'unité de contrepoids en direction de la flèche et l'éloigner de celle-ci. D'autres modes de réalisation comprennent une poutre de support de contrepoids raccordée mobile à la superstructure rotative, la poutre de support de contrepoids comprenant une autre crémaillère accouplée à une surface inférieure de la poutre de support de contrepoids. Un dispositif de déplacement de poutre de support de contrepoids est raccordé entre la poutre de support de contrepoids et le cadre de support de contrepoids.


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    Title :

    LIFT CRANE WITH IMPROVED MOVABLE COUNTERWEIGHT


    Additional title:

    GRUE DE LEVAGE À CONTREPOIDS MOBILE AMÉLIORÉ


    Contributors:

    Publication date :

    2015-07-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66C Krane , CRANES



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