Boom lift vehicle and method of controlling lifting functions

B - Operations – Transporting – 66 – F

Patent

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Details

B66F 17/00 (2006.01) B66F 11/04 (2006.01)

Patent

CA 2554838

A tower boom path (38) is controlled in a boom lift vehicle (10) such that the tower boom nose pin (22) follows a predetermined path. The boom lift vehicle includes a telescoping lift tower boom (18) pivotally coupled at one end to a vehicle base (12). A main boom (24) is pivotally coupled to the tower boom nose pin at an opposite end of the tower boom. Raising and lowering of the tower boom between a fully retracted position and a raised position is effected by pivoting the tower boom relative to the vehicle base and telescoping the tower boom. The raised position is defined according to any position up to a maximum angle of the tower boom relative to the vehicle base and a maximum boom length. In order to reduce vehicle weight and expedite the tower boom lift function, pivoting of the tower boom relative to the vehicle base and telescoping of the tower boom are performed simultaneously so that the tower boom nose pin follows the predetermined path.

Sur un véhicule à flèche de levage (10), le trajet de levage d'une préflèche (38) est commandé de telle sorte que l'axe de nez de flèche (22) suive un trajet prédéterminé. Le véhicule à flèche de levage comprend une préflèche de levage télescopique reliée par l'une de ses extrémités à une base de véhicule (12). Une flèche principale (24) est couplée pivotant à l'axe de nez de flèche à l'extrémité opposée de la préflèche. L'abaissement et le relevage de la préflèche entre une position de rappel complet et une position de sortie complète s'obtiennent en faisant pivoter la préflèche par rapport à la base de véhicule (12) et en sortant ou en rentrant les éléments télescopiques de la préflèche. Pour réduire le poids du véhicule et accélérer la fonction de relevage de flèche, on fait simultanément pivoter la préflèche par rapport à la base et entrer ou sortir les éléments télescopiques de ladite préflèche de telle sorte que l'axe de nez de flèche suit un trajet prédéterminé.

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