Counter-balanced, multiple cable construction crane

Details Counter-balanced, multiple cable construction crane Counter-balanced, multiple cable construction crane

1991-11-18

1993-10-19

Mitchell, David M.

Traversing hoists

With haul-in line

212196, 212262, B66C 2376

Patent

active

052537714

ABSTRACT:
The invention is a counter-balanced, multiple cable construction crane. The apparatus for hoisting payloads comprises a crane having a lifting segment and a counter-balanced segment. The lifting segment comprises an end effector and three cables. One end of each cable attaches to a different winding device located on the lifting segment, and the other end of each cable attaches to a different point on the end effector, such that the three cables have a theoretical point of convergence, this point corresponding with a center of mass of the payload. Three controls command rotation of the winding device to a predetermined position. Accordingly, the crane provides precise and autonomous positioning of the payload without human guidance. Two controls position the counter-balancing segment to offset the overturning moment which arises during the lifting of heavy payloads.

REFERENCES:
patent: 3107791 (1963-10-01), Michael
patent: 3567040 (1971-03-01), Thomson
patent: 3685669 (1972-08-01), Morrison
patent: 3945508 (1976-03-01), Colin
patent: 4155463 (1979-05-01), Buzzichelli et al.
patent: 4664271 (1987-05-01), Evans
patent: 4932541 (1990-06-01), Belsterling

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