PROBLEM TO BE SOLVED: To prevent beforehand a contracting rope from being extended more than allowable level and broken, which is caused by excessive tension acting on the contracting rope, and to prevent beforehand a contracting sheave from being damaged.SOLUTION: In a boom telescopic mechanism, damper means 12 that extends by receiving tension acting on a contracting rope 7 which is not less than a set value to suppress the tension acting on the contracting rope 7 within an allowable range, is provided between a mounting position of the contracting rope 7 and a proximal end part of the contracting rope 7 in a tip of a boom 2 on a proximal part side. Lock pin plunging detection means 41 for detecting plunging of a lock pin 35 into a lock pin hole 36 is provided to prevent contraction operation of a boom 3 in an intermediate position by an actuator 9 while the lock pin 35 plunges into the lock pin hole 36.SELECTED DRAWING: Figure 1

    【課題】縮小用ロープに過大なテンションが作用することで生じる縮小用ロープの許容以上の伸びや破断および縮小用シーブの損傷を未然に防止する。【解決手段】基部側のブーム2の先端における縮小用ロープ7の取付位置と縮小用ロープ7の基端部との間に縮小用ロープ7に作用する設定値以上のテンションを受けて伸縮することで縮小用ロープ7に作用するテンションを許容範囲内に抑制するダンパー手段12を設ける。また、ロックピン用穴36に対するロックピン35の突入を検知するロックピン突入検知手段41を設け、ロックピン35がロックピン用穴36に突入している間、アクチュエータ9による中間位置のブーム3の縮小動作を阻止する。【選択図】図1


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    Title :

    BOOM TELESCOPIC MECHANISM


    Additional title:

    ブーム伸縮機構


    Contributors:

    Publication date :

    2016-08-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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