To ensure fixing of a counterweight on a swivel base, and to make compact an operation area of the swivel base during work.SOLUTION: A counterweight attaching/detaching device 60 comprises: first and second engaging arms 73, 74 that can rotate to a retreating attitude where they are retreated to the lateral side of a swivel base 31 and an engaging attitude where they project behind the swivel base 31 to be engaged with a counterweight 40; an elongation cylinder 75 that is provided between the engaging arms 73, 74, contracted to rotate the engaging arms 73, 74 to the retreating attitude, elongated to rotate the engaging arms 73, 74 from the retreating attitude to the engaging attitude, and further elongated to lift the counterweight 40 by the engaging arms 73, 74; a locking mechanism 63 for locking the first engaging arm 73 in a lifting attitude where the counterweight 40 is lifted; and a rotation regulation member 76 that regulates rotation of the second engaging arm 74 to the retreating attitude when the first engaging arm 73 is in the lifting attitude.SELECTED DRAWING: Figure 9

    【課題】カウンタウエイトを旋回台上に確実に固定し、作業時における旋回台の動作領域をコンパクトにする。【解決手段】カウンタウエイト着脱装置60は、旋回台31の側方に退避した退避姿勢と旋回台31の後方に突出してカウンタウエイト40に係合する係合姿勢とに回動可能な第1係合アーム73及び第2係合アーム74と、係合アーム73、74間に介在され、縮小して係合アーム73、74を退避姿勢に回動させ、伸長して係合アーム73、74を退避姿勢から係合姿勢に回動させ、更に伸長して係合アーム73、74にカウンタウエイト40をリフトアップさせる伸縮シリンダ75と、カウンタウエイト40をリフトアップしたリフトアップ姿勢に第1係合アーム73をロックするロック機構63と、第1係合アーム73がリフトアップ姿勢であるときに、第2係合アーム74が退避姿勢へ向けて回動することを規制する回動規制部材76とを備える。【選択図】図9


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    Title :

    COUNTERWEIGHT ATTACHING/DETACHING DEVICE


    Additional title:

    カウンタウエイト着脱装置


    Contributors:

    Publication date :

    2020-02-27


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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