| 摘要 |
A base has at its upper end a crane engagement portion with which a hook of a crane is engaged. Pivotally engaged with a first shaft affixed to the base below the crane engagement portion, is a substantial center of a lever holder. Swingably mounted on a second shaft affixed to the base below the first shaft is a proximal end of a link lever, and this link lever has a distal end releasably engaged with a distal end of the lever holder. One end of a sling including the other end to be hung on the hook of the crane so as to be engageable with a heavy load, is releasably hung on the link lever. Further, releasing means lowers a proximal end of the lever holder to thereby release the distal end of the link lever from the distal end of the lever holder. In hoisting a heavy load, it is enough to attain a required minimum of size increase of a dismounting device for a heavy load hoisting sling, so as to ensure a strength corresponding to a weight of the heavy load.
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