To provide a boom supporting base 1 capable of dispersing a load applied from a derricking cylinder and reducing the weight of a pin supporting structure 10 and the number of components.SOLUTION: The boom supporting base 1 supports a boom and a derricking cylinder 5 for raising and lowering the boom. The pin supporting structure 10 by which a base end part of the derricking cylinder 5 is supported by a pin is provided on the boom supporting base 1. The pin supporting structure 10 includes a fitting frame 20 of a thick plate and a bottom receiving plate 30 to which the fitting frame 20 is fixed. The bottom receiving plate 30 includes a horizontal plate and an inclined plate on which a convex arch shape is formed. When a load applied from the derricking cylinder 5 is transmitted to the boom supporting base 1, the load is transmitted to the arch-shaped bottom receiving plate 30 through the fitting frame 20 so that it can be transmitted over a wide area of the bottom receiving plate 30 on the boom supporting base 1. Accordingly, since a load can be effectively dispersed and the pin supporting structure 10 can be constituted by a plate material including the fitting frame 20, the weight of the pin supporting structure can be reduced.SELECTED DRAWING: Figure 1

    【課題】起伏シリンダから加わる負荷を分散でき、ピン支持構造10の重量軽減と部品点数減少ができるブーム支持基台1を提供する。【解決手段】ブームとブームを起伏動させる起伏シリンダ5を支持するブーム支持基台1であって、起伏シリンダ5の基端部をピン支持するピン支持構造10がブーム支持基台1上に設けられており、ピン支持構造10は、厚板製の取付フレーム20と取付フレーム20が固定された底受板30からなる。底受板30は、水平板と傾斜した板からなる上に凸のアーチ形である。起伏シリンダ5により加えられる負荷をブーム支持基台1に伝える際、負荷が取付フレーム20を介してアーチ形の底受板30に伝えられるので、ブーム支持基台1上の底受板30で広い面積に伝達できる。このため、負荷分散が効果的に行え、ピン支持構造10を取付プレート20を含む板材で構成できるので、軽量化が行える。【選択図】図1


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    Titel :

    BOOM SUPPORTING BASE


    Weitere Titelangaben:

    ブーム支持基台


    Beteiligte:

    Erscheinungsdatum :

    04.06.2020


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    B66C Krane , CRANES / E02F Baggern , DREDGING



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