Patent ID: 7431638

Claim:
An air passageway opening/closing device provided with: two adjacent air passageways and door means moving in a direction of arrangement of the two air passageways for opening/closing the two air passageways, wherein the door means is constructed by a plurality of sheet members superposed in a direction of flow of air in the two air passageways; the plurality of sheet members have openings for being aligned with at least one of the two air passageways to open the at least one of the two air passageways and passageway blocking parts located on two sides of the direction of door movement of the openings; outside dimensions in the direction of door movement of the plurality of sheet members and the lengths in the direction of door movement of the openings differ from each other by predetermined amounts; as soon as a smaller sheet member among the plurality of sheet members has moved in the direction of door movement by a predetermined amount, the smaller sheet member and an adjacent larger sheet member start to move together; opening ranges of each of the two air passageways are determined by only a position of movement of the opening of the smallest sheet member, and blocking ranges of the two air passageways are determined by superposing the passageway blocking parts of the plurality of sheet members in a stepwise offset state; and a drive force in the direction of door movement is applied only to the smallest sheet member among the plurality of sheet members.