| 摘要 |
PURPOSE:To contrive reduction of operation force by avoiding an effect of air pressure against the operation force of doors, by so constituting that shafts of the doors, such as a differential door, a floor door and a vent door are installed on their central parts in their width directions so as to let the air pressure act on the doors on both sides of them in their width directions against the shafts. CONSTITUTION:When a negative pressure actuator 32 is driven a main link 15 is turned in the anticlockwise direction, a vent door 3 and a differential door 7 are turned in the clockwise direction and a floor door 5 is turned in the anticlockwise direction respectively, through which an opening of each of the doors 3, 5 and 7 is adjusted and a mode of the same can be varied. In this instance, air pressure acting on both sides of the doors centering around shafts 8-10 of the doors are offset each other. Operation force, therefore, can be reduced by avoiding an effect of the air pressure. |
