| 摘要 |
PURPOSE:To permit to reverse the ventilating direction and keep the same property in both of the ventilating directins by a method wherein a runner is moved to an arbitrary position between front and rear guiders and the ventilating property is affected only by a distance between the outer periphery of the runner and the tongues of respective guiders. CONSTITUTION:In case the runner 11 is moved into the direction of the front guider 12 or to a position 11A, the shortest distance 11 between the outer periphery of the runner 11 and the tongue t of the front guider 12 becomes smaller than the distance 12 between the rear guider 13 and the tongue s while air flows into the direction shown by an one-dot chain line arrow sign A when the rotating direction of the runner 11 is the direction shown by an natural line arrow sign (a). When the runner is moved to the position 11B, the distance 11 becomes larger than the distance 12, and, therefore, the direction of the flow is reversed to the direction shown by a broken line arrow sign B. In this case, the ventilating property is affected only by the relations of the shortest distance 11 and the distance 12 between the outer periphery of the runner 11 and the tongues (t), (s), therefore, only the ventilating direction is reversed but the ventilating property may be kept in constant. |
