To provide a come-off prevention device simple in operation of opening a latch port of a hook and capable of ensuring a large effective size of the latch port when a slinging tool is unlatched, with a simple and rational mechanism.SOLUTION: An inner come-off prevention member 4 and an outer come-off prevention member 5 are rotatably fitted to a support shaft member 3, and the outer come-off prevention member 5 is biased to rotate forward. Both the come-off prevention members are groove-shaped in a cross sectional direction, the inner come-off prevention member 4 is stored in a groove of the outer come-off prevention member 5, and a locking piece 54 of the outer come-off prevention member 5 is locked to the inner come-off prevention member 4 from the backside. When the outer come-off prevention member 5 rotates forward, the inner come-off prevention member 4 integrally rotates forward. When the inner come-off prevention member 4 comes into contact with the vicinity of a tip 13 of a hook 1, the outer come-off prevention member 5 covers the tip 13 of the hook 1. When the outer come-off prevention member 5 is pushed in, the inner come-off prevention member 4 integrally rotates backward, and the outer come-off prevention member 5 is layered on the inner come-off prevention member 4 to be held below a neck 11 of the hook 1.SELECTED DRAWING: Figure 1

    【課題】玉掛け用具の掛け外しに際し、フックの掛け口を開く操作が簡単で、掛け口の有効寸法も大きく確保できる外れ止め装置を、簡素で合理的な機構により実現する。【解決手段】支軸部材3に内側外れ止め部材4と外側外れ止め部材5とが回動可能に取り付けられ、外側外れ止め部材5が前方へ回動するように付勢される。両外れ止め部材は横断面溝形をなして、外側外れ止め部材5の溝内に内側外れ止め部材4が収容され、外側外れ止め部材5の係止片54が内側外れ止め部材4に背面側から係止される。外側外れ止め部材5が前方へ回動する際には内側外れ止め部材4も前方へ回動し、内側外れ止め部材4がフック1の先端部13近傍に当接すると、外側外れ止め部材5がフック1の先端部13を覆う。外側外れ止め部材5が押し込まれると内側外れ止め部材4も後方へ回動し、外側外れ止め部材5が内側外れ止め部材4に重なってフック1の首部11下方に保持される。【選択図】図1


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    Title :

    COME-OFF PREVENTION DEVICE FOR HOOK


    Additional title:

    フックの外れ止め装置


    Contributors:

    Publication date :

    2024-05-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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