Patent ID: 7090575

Claim:
An air passage opening and closing device for controlling an air flow for air-conditioning a vehicle compartment comprising: a casing of an air conditioner for a vehicle which has an opening portion through which air flows, forms air passages and is provided with at least an evaporator; and an opening and closing door which opens and closes the opening portion and mixes air from the evaporator with hot air or switches an air discharging mode at least between a face mode and a foot mode; wherein on a portion of an end side of the opening and closing door, corresponding to an edge portion of the opening portion, an elastically deformable lip seal for closing a gap formed between the opening and closing door and the edge portion of the opening portion when the opening portion is closed by the opening and closing door is provided, and on a tip of the lip seal a plurality of extending portions are provided; and wherein an extending dimension of the extending portions is more than or equal to substantially 1 mm and less than or equal to substantially 3 mm, a dimension in a width direction orthogonal to the extending direction in the extending portions is more than or equal to 2 mm and less than or equal to 14 mm, and a gap distance between adjacent extending portions is more than or equal to 1 mm and less than or equal to 4 mm.