| 摘要 |
<p>A shaft extends across the air discharge opening and is rotatably mounted. A drive are operatively connected to the shaft for rotating the shaft on its axis. Discs are disposed in spaced relationship on the shaft such that for each disc, the distance between at least one point on its periphery and the axis of the shaft is larger than the distance between another point on its periphery and the axis of the shaft. A pair of adjacent louvre blades extend across the air discharge opening, each louvre blade having two edges and pivotally mounted in the air discharge opening about its first edge. A biasing spring urges the louvre blade second edges toward each other to cause an engaging relationship between the discs and the pair of louvre blades such that as the discs rotate, the blades are caused to pivot about their first edges thus causing a change in the direction of airflow emanating from the discharge opening.</p> |
