Importance

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Abstract

After a heavy load hoisted up by a hoisting member is downed on the predetermined place, the hoisting member can be automatically dismounted from the heavy load by using the dismounting device. The hoisting member consists of a upper hoisting member and a lower hoisting member. The upper hoisting member is arranged between a base of the dismounting device and a hook of a crane. The lower hoisting member has a foundation and secured to the base, a mid portion engaged with a hoisting member engagement portion of the heavy load, and a front end fitted or inserted onto a mast erected on the base. In operation, a slider up-and-down slidably mounted on the mast is pushed up by a resilient body, in its no load condition, to a level where its top end reaches at least a top end of the mast. The slider is adapted to conquer resilient force of the resilient body while the slider hoists the base. When the heavy load hoisted is downed on the predetermined position, a slider downing device is made inoperative and the slider is pushed up by resilient force of the resilient body, resulting in sweeping aside the ring of the hoisting member or wire engaged with the mast. Then the crane raises the base of the dismounting device, thereby the lower hoisting member passes through the engagement portion and separated from the heavy load.

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First Claim