Reversible fan with cylindrical resilient rubber spring

摘要

A fan having reversible blades supported on a ring. The blades have means for holding the blades against rotation around thin central axis so that they can be selectively set to either blow cooling air forward away from the driver or rearward to add to the comfort of the driver. The resilient means urging the blades outward is made up of rubber cylinders that receive the hubs of the blades. One end of the cylinder rests on the fan while the thick end of the cylinder rests on the fan blades. The cylinder has a barrel shaped inside surface which it in giving the sleeved a generally uniform spring rate throughout its entire excursion.