| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow passage open/close device provided at an air supply/exhaustion flow passage for ventilation and the like capable of securely preventing flow in a direction opposite to an exhaustion direction with a simple structure. SOLUTION: The flow passage open/close device has a flow passage open/close wing 2 to be closed for an air flow in a direction from a flow entry 107 to a flow out-port 106, frame parts 1, 3 for rotatably holding the flow passage open/close wing, a rotation shaft 22, a first wing part 21 formed at a side for the rotation shaft and a second wing part 23 formed at a side opposite to the first wing part with the rotation shaft in between. At least one of the first wing part or the second wing part has a first engaging part 25. The frame part has a second engaging part 32 for restricting rotation of the flow passage open/close means in which the flow passage open/close means contacts with the first engaging part when the flow passage is closed. COPYRIGHT: (C)2005,JPO&NCIPI
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