Patent ID: 6929525

Claim:
A decorative vent attachment comprising a base having a rack and a boring for airflow to blow through; two semicircle-shaped swinging means each having a hemicycle edge, each swinging means has a wheel-shaped connector adjacently connected to the edge of said base; said connectors each having a wheel gear in which said two wheel gears bite and turn each other respectively to open and close said boring intermittently; a fan module having a shaft mounted on the center of said rack, matching said boring; a small wheel gear attached to said fan module shaft; a big wheel gear attached to said rack mounted deviating from the center of said rack, to bite and turn with said small wheel gear; and a cam adjacently mounted to said big gear wheel, in which the distance from the edge of said cam to the center of said big gear wheel is larger than the distance from the edge of swinging means to the center of said cam, when said swinging means are being closed; allowing airflow to turn said fan module, making said small gear wheel to drive said big wheel gear to turn said cam, wherein said cam intermittently pushes the hemicycle edge of one of said swinging means, to make two swinging means forming an open-closed action.