B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
B66C 23/72 (2006.01) B66C 23/62 (2006.01) B66C 23/74 (2006.01) B66C 23/84 (2006.01)
Patent
CA 2217548
A ring-supported lift crane is provided with a counterweight handling system to facilitate repositioning of the crane. The ring-supported crane includes a ring, a crane upper works and a crane lower works, a boom supported on rollers on the ring and a counterweight assembly also supported on rollers on the ring. The counterweight assembly preferably includes a counterweight carrier on which at least one stack of counterweight boxes or units are placed. A counterweight holder is interposed between the at least one stack of counterweight units and the counterweight carrier with a friction reduction device, such as rollers or slider pads, interposed between the counterweight holder and the counterweight carrier. When the ring-supported crane is to be repositioned for a second lift at a construction site, the counterweight holder with the stack of counterweight units is moved off of the counterweight carrier onto a separate counterweight support member, which may be mobile or stationary. This speeds up the relocation process, as the counterweight units do not have to be individually unstacked before the ring and crane can be moved.
Grue montée sur plaque tournante pourvue d'un système de manutention des contrepoids pour faciliter le repositionnement de la grue. La grue à plaque tournante comprend une plaque tournante, une superstructure, des organes inférieurs, une flèche supportée par des galets montés sur la plaque tournante et un ensemble de contrepoids aussi supporté par des galets montés sur la plaque tournante. L'ensemble des contrepoids comporte de préférence un porte-contrepoids sur lequel se trouve au moins une pile de poids unitaires ou des boîtes de poids. Un dispositif réducteur de frottement est intercalé entre au moins une pile de poids unitaires et le transporteur de contrepoids (p. ex. : des galets ou des tampons de glissement intercalés entre le porte-contrepoids et le transporteur de contrepoids). Quand vient le temps de repositionner la grue à plaque tournante sur le chantier de construction pour effectuer un autre levage, le porte-contrepoids et sa pile de poids unitaires sont déposés du transporteur de contrepoids et placés sur un dispositif de soutien distinct, qui peut être mobile ou fixe, ce qui permet d'accélérer le processus de repositionnement, puisqu'on n'a pas besoin de désempiler les poids unitaires un par un avant de déplacer la plaque tournante et la grue.
Dreger Jeffery L.
Lanning John M.
Petzold Terry L.
Cassan Maclean
Manitowoc Crane Group Inc.
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