To provide a safety mechanism temporarily fixing a hook opening closing member while keeping the hook opening of a hook open to reduce the burden of slinging work and automatically closing the hook opening with start of hoisting as it is.SOLUTION: A detachment prevention device 101 includes a hook opening closing member 5 connected to a support shaft member 4 arranged in front of and above a tip part 13 of a hook 1 and rotated in the longitudinal direction to open/close a hook opening 10, and an energization member 6 mounted on the support shaft member 4 to rotate the hook opening closing member 5 forward. When external force does not act, the hook opening closing member 5 closes the hook opening 10. When the hook opening closing member 5 is pushed toward a neck part 11 of the hook 1, the hook opening 10 is opened. The detachment prevention device includes hook opening temporary fixing means magnetically attached to a position in which the hook opening 10 is opened by the hook opening closing member 5 by means of a magnet 7. When the load of a suspension cargo is applied to the hook 1, a magnetically attached portion is separated so that the hook opening closing member 5 returns to a position of closing the hook opening 10.SELECTED DRAWING: Figure 4

    【課題】フックの掛け口を開いたまま掛け口封鎖部材を仮止めして玉掛け作業時の負担を軽減し、さらにそのまま吊り上げを始めると掛け口が自動的に閉じる安全機構を設ける。【解決手段】フック1の先端部13よりも前方かつ上方に配された支軸部材4に連結され前後方向に回動して掛け口10を開閉する掛け口封鎖部材5と、支軸部材4に装着されて掛け口封鎖部材5を前方に回動させる付勢部材6と、を具備し、外力が作用しないときは掛け口封鎖部材5が掛け口10を塞ぎ、掛け口封鎖部材5がフック1の首部11側へ押し込まれると掛け口10が開くように構成された外れ止め装置101において、掛け口封鎖部材5が掛け口10を開いた位置に磁石7によって磁着される掛け口仮止め手段を設ける。さらに、フック1に吊り荷の荷重が加わると磁着箇所が離別して掛け口封鎖部材5が掛け口10を塞ぐ位置に復帰する構成を付加する。【選択図】図4


    Access

    Download


    Export, share and cite



    Title :

    HOOK DETACHMENT PREVENTION DEVICE


    Additional title:

    フックの外れ止め装置


    Contributors:

    Publication date :

    2023-04-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



    Anti-detachment hook structure for a car cover

    ZHENG SHIQI | European Patent Office | 2025

    Free access

    HOOK FALLING PREVENTION DEVICE

    NARASAKO KOICHI / ITASAKA YOSHIKADO | European Patent Office | 2016

    Free access

    BICYCLE WHEEL DETACHMENT PREVENTION DEVICE

    TAKAO HIROSHI | European Patent Office | 2020

    Free access

    ELEVATOR ROPE DETACHMENT PREVENTION DEVICE

    HONDA HIDEHITO | European Patent Office | 2019

    Free access

    SWING PREVENTION DEVICE OF SUSPENSION HOOK

    KOIZUMI YUKIO | European Patent Office | 2017

    Free access