Crane with redundant hoist arrangement and method of using same

Details Crane with redundant hoist arrangement and method of using same Crane with redundant hoist arrangement and method of using same

B - Operations, Transporting

66

D

B66D 1/36 (2006.01) B66C 17/04 (2006.01) B66D 1/26 (2006.01) B66D 1/38 (2006.01) B66D 1/54 (2006.01)

Patent

CA 2108822

The disclosure involves a crane having a main hoist drum and an auxiliary hoist drum for handling a load under normal and emergency (the latter actual or simulated) conditions, respectively. The latter condition involves a main hoist which is inoperative because of a failure or by intent. The auxiliary hoist drum is wrapped with about twice the length of cable as the main drum and can move the load up or down, irrespective of load position if and when the main hoist becomes inoperative. Also disclosed is a novel method for moving a load. Steps include maintaining one drum in a non-rotating mode and rotating the other drum. An improved crane load block is also disclosed to have "floating sheaves" which help prevent excessive fleet angles.

Cette invention concerne une grue équipée d'un tambour de treuil principal et d'un tambour de treuil auxiliaire destinésà la manutention de charges en conditions normales et d'urgence respectivement (les conditions d'urgence pouvant être réelles ou simulées). Les conditions d'urgence supposent que le treuil principal est inopérant en raison d'une panne ou d'une intervention volontaire. Le tambour du treuil auxiliaire porte environ le double de la longueur de câble enroulée sur le tambour principal et peut lever et abaisser la charge sans égard à sa position dès que le treuil principal cesse de fonctionner. Cette invention propose également une méthode novatrice de manutention qui suppose le blocage d'un des treuils pendant que l'autre est entraîné. Elle concerne également un moufle amélioré comportant des "réas flottants" qui aident à prévenir les angles de déviation du câble excessifs.

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