Patent ID: 7549687

Claim:
A dismounting device for a heavy load hoisting sling, comprising: a base including at its upper end a crane engagement portion to be engaged with a hook of a crane or with a hook block; a lever holder pivotally connected at a substantial center thereof to a first shaft affixed to the base below the crane engagement portions; a link lever including a proximal end swingably mounted on a second shaft affixed to the base below the first shaft, and a distal end to be releasably engaged with a distal end of the lever holder, in which one end of a sling including the other end to be hung on the hook of the crane or on the base so as to be engageable with a heavy load, is releasably hung on the link lever; and releasing means for lowering a proximal end of the lever holder to raise the distal end of the lever holder, thereby releasing the distal end of the link lever from the distal end of the lever holder and further comprising a handle that protrudes from the distal end of said lever holder which can be gripped by a human worker, wherein said releasing means comprises: a slider vertically movably provided on said base to engage with the proximal end of said lever holder, thereby urging the proximal end of said lever holder in a direction to push down the same; locking means provided on said base and engaged with said slider to thereby temporarily lock said slider in a raised state; and unlocking means for unlocking the temporarily locked slider; wherein when the weight of the heavy load is applied to the link lever through said sling, there is maintained a state where the distal end of said link lever is engaged with the distal end of said lever holder; and wherein said slider is configured to raise the distal end of said lever holder to thereby release the distal end of said link lever from the distal end of said lever holder when the temporarily locked slider is unlocked by said unlocking means and the weight of the heavy load is not applied to said link lever through said sling.