Device for moving objects along a predetermined path

A device for moving a curtain between an open and a closed position comprising an elongated rotatable shaft having a circular peripheral surface;

• means for rotating the shaft in one and in an opposite direction;
• and a plurality of suspension means arranged spaced from each other along and suspended on said shaft and each comprising at least two rolls frictionally engaging said peripheral surface and arranged displaced from each other in the circumferential direction of said peripheral surface and a hook-shaped frame extending only partly about said shaft and carrying said rolls with the axes thereof including fixed angles with the longitudinal axis of said shaft, said frame having a lower end portion below and vertically aligned with the shaft axis and ending in a hook so that successive portions of a curtain may be connected to the hooks of successive suspension means and the curtain be moved between an open and a closed position during rotation of said shaft in the one and the opposite direction, the axes of the rolls on successive suspension means including with the shaft axis an angle which increases from one to the next suspension means so that successive suspension means move during rotation of said shaft with increasing speeds.