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 arranged between the first boom 21 and the second boom 22, and contacted with an inner surface of the first boom 21 and an outer surface of the second boom 22. In the first boom 21, a center part 21d of an upper plate 21a at a position in s shaft direction corresponding to parts which the slide plates 31 and 32 contact with the entire length of the extendable boom 20 extended has a thinner plate thickness than the plate thickness of the other part in the first boom 21, and is formed to be easily extendable in a direction crossing the shaft direction 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1ブーム21と第2ブーム22との間に配置され、第1ブーム21の内面と第2ブーム22の外面とに接触したスライドプレート31,32と、を備え、第1ブーム21のうち、伸縮ブーム20の全長を伸ばした状態でスライドプレート31,32が接触する部分に対応した軸方向の位置における上板21aの中央部分21dが第1ブーム21の他の部分に比べて板厚が薄く、第1ブーム21の軸方向に対して交差する方向に伸び易く形成されている。【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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