TODAY’S PATENT – AIR VENTILATOR

The AIR VENTILATOR was invented by Byung E. Yoo (Daegu-si) on the 18^th  of June 1985 , bearing patent number US4523434A.

The present invention solves the problems associated with the prior art air ventilator devices as well as other devices by providing a new and useful air ventilator having variable pitch blades.

The air ventilator, in corresponding with the present invention, includes a casing for carrying a motor disposed in a frame. A rotor is mounted on the shaft of the motor. The fan blades are  joined to the rotor through a turning link. The rotating circular plate including sliding slots and a plurality of holes formed thereon and centrifugal weight elements which can be turned around the pin connecting the fixed circular plate with the rotating circular plate are mounted on the shaft of the motor and fixed with the head cap, and all are rotated together according to the rotation of the shaft of the motor. One major of the present invention is to provide an air ventilator which can fully close the air-passage with the adjacent blades coming in contact with each other when the ventilator is not operating and open the air-passage with the angular displacement of the blades caused by the centrifugal force of the rotating blades.