Abstract: An annular frame has an outer and an inner wall defining a space therebetween and a plurality of wheels rotatably mounted on said walls. Carriages for carrying material to be cooled are located in said space adjacent each other. Each carriage has a pair of aligned pins fixedly connected thereto and turnably mounted in the frame, and a pair of levers fixedly connected at one end to the pins and extending transverse to the pins axes. Roller followers are fixedly mounted at the other ends of the lever. A pair of annular guide rails support the plurality of the wheels rotably mounted on the walls of the frame and are engaged by the roller followers. Each guide rail has in a zone of unloading of the carriages a downwardly curving portion. During riding of the roller followers over this portion the respective carriages tilt about the axes of the pins to thereby discharge the material from the carriages.