To provide a telescopic boom capable of reducing the entire length of a boom in a fully contracted state.SOLUTION: An expansion mechanism of a telescopic boom comprises: a bracket 60 provided on the inner surface of an intermediate boom 32; an extending sheave 52 rotatably provided on the bracket 60; an extending wire, one part of which is supported by a base end boom, and the other part of which is supported by a tip boom, having the intermediate part wrapped round the extending sheave 52; and a fixing mechanism 70 which fixes the bracket 60 to the intermediate boom 32; where the fixing mechanism 70 is provided at a position which is offset to the tip side of the intermediate boom 32 with respect to the rotation center of the extending sheave 52.SELECTED DRAWING: Figure 4

    【課題】全縮状態におけるブームの全長を小さく抑えることができる伸縮ブームを提供する。【解決手段】伸縮ブームの伸縮機構は、中間ブーム32の内面側に設けられるブラケット60と、ブラケット60に回転自在に設けられる伸シーブ52と、一端部が基端ブームに支持されるとともに他端部が先端ブームに支持されて、その中間部が伸シーブ52に掛け回される伸ワイヤと、ブラケット60を中間ブーム32に固定する固定機構70とを有し、この固定機構70は伸シーブ52の回転中心に対して中間ブーム32の先端側にオフセットした位置に設けられている。【選択図】図4


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    Title :

    TELESCOPIC BOOM


    Additional title:

    伸縮ブーム


    Contributors:

    Publication date :

    2019-05-16


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / B66C Krane , CRANES / E02F Baggern , DREDGING



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