To provide a jib raising/lowering mechanism having a compact structure for raising/lowering a gib, which compensates for the length of the boom of a crane truck.SOLUTION: A bib raising/lowering mechanism raises/lowers the gib which is raisably/lowerably coupled to the boom of a crane truck in use, meanwhile, stored along a lower surface of the boom at least temporarily in nonuse. The gib raising/lowering mechanism comprises: a slide bracket disposed around the gib so as to be slidable along a longitudinal axis with respect to the gib; a tension rod structure one end of which is coupled to the slide bracket and the other end of which is coupled to the boom in use; and a gib raising/lowering cylinder structure disposed on a side surface of the gib and along the longitudinal axis. The gib raising/lowering cylinder structure is disposed on the side surface of the gib such that one end of this cylinder structure is coupled to the jib and the other end of it is coupled to the slide bracket.SELECTED DRAWING: Figure 7

    【課題】クレーン車のブームの長さを補うジブを起伏させるコンパクトな構成のジブ起伏機構を提供する。【解決手段】ジブ起伏機構は、使用時にはクレーン車のブームに起伏可能に連結され、不使用時には少なくとも一時的に前記ブームの下面に沿って格納されるジブを起伏させる。前記ジブ起伏機構は、前記ジブに対して長手軸に摺動可能に前記ジブの周囲に配設されたスライドブラケットと、一端部が前記スライドブラケットに連結されており、他端部が使用時に前記ブームに連結されるテンションロッド構造体と、前記ジブの側面に長手軸に沿って配設されたジブ起伏シリンダ構造体を備えている。前記ジブ起伏シリンダ構造体は、一端部が前記ジブに連結され、他端部が前記スライドブラケットに連結されており、前記ジブの側面に配置されている。【選択図】図7


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    Title :

    GIB RAISING/LOWERING MECHANISM AND CRANE TRUCK WITH JIB RAISING/LOWERING MECHANISM


    Additional title:

    ジブ起伏機構およびジブ起伏機構を備えたクレーン車


    Contributors:

    Publication date :

    2020-04-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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