Patent ID: 7758260

Claim:
A barrier device comprising: a cover defining a front aperture; a base joined with a backside of the cover and defining a rear aperture; an annular gap formed between a rear end face of the front aperture and a front end face of the rear aperture; a barrier member movably mounted through the gap between a closed position where the barrier member faces the front aperture and the rear aperture and an opened position where the barrier member is retracted from the front aperture and the rear aperture; and a seal member for sealing the gap, the sealing member being provided over an entire circumference of the gap and formed such that when the barrier member is in the opened position, the seal member seals the gap with a part thereof being in contact with the barrier member, and when the barrier member is in the closed position, the seal member deforms to make contact with a surface of the barrier member.