Patent ID: 7654796

Claim:
An electric fan comprising: a fan base comprising a central tube; a bearing received in the central tube, the bearing having an outer wall with at least one bulwark circumferentially formed thereon, the at least one bulwark abutting against an inner surface of the central tube, a central hole and at least one partition hole defined in the bearing, wherein the at least one partition hole corresponds to the at least one bulwark; and a rotor assembly comprising a fan hub, and a pivot axle joined to the fan hub and pivotably extending into the central hole of the bearing; wherein the at least one partition hole corresponding to the at least one bulwark is so configured that it prevents a radially inward pressure exerted by the central tube on the bearing from being exerted to the pivot axle via the bearing, whereby a friction between the bearing and the pivot axle is reduced; and wherein the at least one partition hole is defined through the bearing and circumferentially around the central hole.