Abstract: A fan constructed according to the present invention has a base supporting a vertical tube having a movable vertical rod inside. The lower end of the rod is hingedly connected to a means for attaching the device to a moving part of a rocking chair, such as a rocker, seat or leg. An endless belt is connected to the top of the vertical rod for oscillating movement therewith, the belt being held in a vertical loop by a pair of wheels or gears mounted within the tube. A top wheel movable with the belt engages a set of gears in such a manner as to transform oscillatory motion of the belt into rotation of a horizontal shaft in a single direction. A set of fan blades is mounted on the horizontal shaft.