Three-wheel forklift truck

B - Operations – Transporting – 66 – F

Patent

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Details

B66F 9/075 (2006.01) B62D 7/15 (2006.01)

Patent

CA 2686974

A forklift truck comprises two driven front wheels 12L, 12R and a single driven central rear wheel 14. The truck is operable in a sideways mode (Figures 2A-2C) in which the rear wheel is fixed at an angle substantially- parallel to an axis passing through the two front wheels and the two front wheels are steered in synchronism in opposite directions of rotation. The truck is further operable in a rotational mode in which the centre of rotation C of the truck is disposed inside a notional circle 200 passing through all three wheels. The truck enters the rotational mode from the sideways mode by automatic reversal of the drive direction of the rear wheel, by actuating a changeover valve 40, when the centre of rotation moves from outside to inside the notional circle.

L'invention concerne un chariot élévateur à fourche qui comprend deux roues avant entraînées 12L, 12R et une seule roue arrière centrale entraînée 14. Le chariot peut fonctionner en mode latéral (Figures 2A-2C) dans lequel la roue arrière est fixée en formant un angle sensiblement parallèle à un axe passant à travers les deux roues avant et les deux roues avant sont orientées en synchronisme dans des directions opposées de rotation. Le chariot peut en outre fonctionner en mode rotatoire dans lequel le centre de la rotation C du chariot est placé à l'intérieur d'un cercle théorique 200 passant à travers toutes les trois roues. Le chariot entre dans le mode rotatoire à partir du mode latéral par inversion automatique de la direction d'entraînement de la roue arrière, en actionnant la soupape d'inversion 40, lorsque le centre de la rotation se déplace de l'extérieur vers l'intérieur du cercle théorique.

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