PROBLEM TO BE SOLVED: To provide an extendable boom, which can prevent or suppress stress at a corner part of an outer boom from being enhanced.SOLUTION: An extendable boom 20 comprises: a first boom 21 formed in a tube shape; a second boom 22, stored inside the first boom 21 with the entire length of the extendable boom 20 contracted, which protrudes from the first boom 21 in a shaft direction of the first boom 21 with the entire length of the extendable boom 20 extended; and slide plates 31 and 32 supported on a support member 40 fixed to the second boom 22 and contacted with an inner surface of the first boom 21. The support member 40 comprises an inclination deforming part 41 that inclines the slide plates 31 and 32 following inclination of the inner surface of the first boom 21 caused by outward convex deformation of the first boom 21.SELECTED DRAWING: Figure 4

    【課題】伸縮ブームにおいて、外側ブームの角部の応力が高くなるのを防止又は抑制する。【解決手段】伸縮ブーム20は、筒状に形成された第1ブーム21と、伸縮ブーム20の全長を縮めた状態で第1ブーム21の内側に収容され、伸縮ブーム20の全長を伸ばした状態で第1ブーム21の軸方向に第1ブーム21から突出する第2ブーム22と、第2ブーム22に固定された支持部材40に支持され、第1ブーム21の内面と接触したスライドプレート31,32と、を備え、支持部材40は、第1ブーム21の外方への凸状の変形による第1ブーム21の内面の傾きに倣ってスライドプレート31,32を傾かせる傾き変形部41を備えている。【選択図】図4


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    Title :

    EXTENDABLE BOOM


    Additional title:

    伸縮ブーム


    Contributors:

    Publication date :

    2018-05-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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