Patent ID: 7104008

Claim:
A door system comprising: a compartment formed with a first wall defined by a first pair of substantially parallel, coplanar panels spaced from one another so that opposed edges of the panels in the first pair of panels define a first gateway and a second wall defined by a second pair of substantially parallel, coplanar panels spaced from one another so that opposed edges of the panels in the second pair of panels define a second gateway opposed to the first gateway and internal surfaces of the compartment defining a generally polygonal shape in plan view; and a barrier apparatus which is housed in the compartment, the barrier apparatus including: a swivel panel with opposite first and second ends and opposite first and second surfaces extending between the ends, the swivel panel being mounted to swing back and forth to assume a first position where the first surface of the swivel panel faces the first gateway, a second position where the second surface of the swivel panel faces the first gateway, and a third position between the first and second positions; first and second door panels provided at the opposite first and second ends of the swivel panel, the door panels being mounted on the swivel panel such that both door panels respectively open the gateways when the swivel panel assumes the first position and the second position, and such that the door panels respectively close the gateways when the swivel panel assumes the third position, the door panels being interrelated with the compartment to keep substantially air-tight sealing therebetween while the swivel panel is swinging between the first and second positions; and a driving mechanism which operatively swings the swivel panel back and forth between the first and second positions, wherein each of the door panels has an arc shape in plan view, and wherein each of the first and second door panels maintains substantial air-tight sealing contact with at least one of the edges of a respective one of the first and second gateways in all swinging positions of the swivel panel.