Patent ID: 7296968

Claim:
A fan acceleration structure of a shredder comprising a motor with at least one projecting drive shaft; a fan further comprising a hub, mounted coaxially on said drive shaft with at least one rotational bearing, a plurality of fan blades attached to said hub, and a sun gear, having gear teeth on an outer diameter, attached coaxially to said hub; a ring drive gear, having gear teeth on an inner diameter thereof, a ring gear hub fixedly attached to said drive shaft, and at least one side shaft, fastened to said ring gear hub, parallel to and radially offset from said drive shaft; and at least one connection gear, having gear teeth on an outer diameter, each mounted coaxially on one said side shaft with at least one rotational bearing; wherein the ring drive gear is driven by the motor shaft, the connection gear teeth engage with and are urged to rotate by the ring drive gear teeth, the connection gear teeth in turn engage with the sun gear teeth urging the fan to rotate at an accelerated speed compared to the motor.