| 摘要 |
PROBLEM TO BE SOLVED: To provide an auxiliary hoisting device which is small in hoisting capacity, short in time required for hoisting, unnecessary for special treatment in movement, and capable of rapidly progressing the work. SOLUTION: An object hoisting wire 19 one end 19a of which is fixed to a top plate 7 is successively wound around two fixed blocks 15a, 15b supported by the top plate 7 forming a top part of a base 3 having three legs and three movable blocks 17a, 17b, 17c supported by a block assembly frame 25. The other end 19b of the wire 19 is wound around a suspended block 47 supported by an accessary 31 to be hoisted above the top plate 7, and fixed to the top plate 7 at the folded-back point, a tetra-pot 61 is hoisted by a hoisting hook 2 fitted to the block assembly frame 25, a base hoisting wire 53 having a slackness while the tetra-pot 61 is hoisted at the specified height L is suspended between the accessary 31 to be hoisted and the base 3, and the hoisted accessary 31 is hoisted by the crane. The hoisting capacity can be only 1/6 of the weight of the tetra-pot 61, and the hoisting distance of the accessary 31 can be only 3L, and the device can also be hoisted by the base hoisting wire 53.
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