Patent ID: 6923238

Claim:
A door adapted to at least partially cover a doorway in a wall, the door having an opened position and a closed position, comprising: a first door panel adapted to be mounted for translation in front of the doorway; a second door panel adapted to be mounted for translation in front of the doorway, wherein the first door panel has a first open position in front of the second door panel, the second door panel has a second open position adjacent the doorway between the first panel and the wall, and the door is in the opened position when the first door panel and the second door panel are in the first open position and the second open position respectively, the first and second door panels respectively having a first closed position and a second closed position relative to the doorway and being arranged to telescope to position the door in the opened or closed position; a main drive mechanism providing power for driving the first panel between the first open position and the first closed position; and an auxiliary drive mechanism coupling the first door panel and the second door panel, the auxiliary drive mechanism using the power provided by the main drive mechanism to drive the second door panel such that the first and second door panels have a first state of movement wherein movement of the first door panel is independent of movement of the second door panel, and the first and second door panels have a second state of movement wherein movement of the second door panel is dependent upon movement of the first door panel, wherein upon movement of the first door panel away from its closed position, the auxiliary drive mechanism urges the second door panel to move toward the second open position before the first door panel reaches the first open position.