Patent ID: 8899157

Claim:
An aerial transport installation with back-and-forth movement comprising: two carrying-hauling ropes extending in two individual closed loops between two end terminals separated from one another by an intermediate station, vehicles suspended on the two carrying-hauling ropes by non-detachable fixed grips to perform back-and-forth runs between the end terminals and the intermediate station by means of a geared motor, a first bull-wheel in one of the end terminals, a second bull-wheel in the other end terminal, a common double pulley in the intermediate station, wherein the double pulley of the intermediate station is provided with a first groove having a first groove root diameter D 1 and a second groove having a different second groove root diameter D 2 , such that a ratio of the first and second groove root diameters D 1 /D 2 is equal to a ratio L 1 /L 2 where L 1 is an axial distance separating the centers of the first bull-wheel and of the double pulley, and L 2 is an axial distance separating the centers of the second bull-wheel and of the double pulley.