PROBLEM TO BE SOLVED: To enable a shift from an inside holding posture to an overhanging posture of a jib and a shift from the overhanging posture to the inside holding posture while maintaining connection between a boom and the jib, and achieve simplification and weight saving of a connection structure of the jib and the boom.SOLUTION: A derricking member 1 comprises a boom 34 and a jib 36. A first support part 74 of the boom 34 has a first restraint part 92 for restraining a first retaining part 91 so as to inhibit displacement of the jib 36 in a direction in which a jib foot pin 38 is disengaged from a first recess 80 while allowing movement of the first retaining part 91 along a first circular arc Aat the time of rotation of the jib 36 around the jib foot pin 38 held by the first recess 80. A second support part 75 of the boom 34 has a second restraint part 97 for restraining a second retaining part 96 so as to inhibit displacement of the jib 36 in a direction in which an inside holding pin 40 is disengaged from a second recess 84 while allowing movement of the second retaining part 96 along a second circular arc Aat the time of rotation of the jib 36 around the inside holding pin 40 held by the second recess 84.SELECTED DRAWING: Figure 3

    【課題】ブームとジブの連結を維持しながらジブの内抱姿勢から張出姿勢への移行及び張出姿勢から内抱姿勢への移行を可能としつつ、ジブとブームの連結構造の簡素化及び軽量化を図る。【解決手段】起伏部材1は、ブーム34及びジブ36を備え、ブーム34の第1支持部74は、第1凹部80に保持されたジブフットピン38を中心としたジブ36の回動時に第1円弧A1に沿った第1抜止部91の移動を許容しつつジブフットピン38が第1凹部80から離脱する方向へのジブ36の変位を阻止するように第1抜止部91を拘束する第1拘束部92を有し、ブーム34の第2支持部75は、第2凹部84に保持された内抱ピン40を中心としたジブ36の回動時に第2円弧A2に沿った第2抜止部96の移動を許容しつつ内抱ピン40が第2凹部84から離脱する方向へのジブ36の変位を阻止するように第2抜止部96を拘束する第2拘束部97を有する。【選択図】図3


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    Title :

    DERRICKING MEMBER OF CRANE


    Additional title:

    クレーンの起伏部材


    Contributors:

    Publication date :

    2017-11-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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