Patent ID: 8549795

Claim:
An apparatus for securing a four-walled access corridor to a high security facility, comprising: a door passage perpendicular to and intersecting the four-walled access corridor, the door passage delineating a secure side portion of the access corridor extending away from the door passage on one side, and a threat side portion of the access corridor extending away from the door passage on the other side; a penetration resistant door disposed within the passage, and oriented with a front surface of the door facing a front wall of the passage and the threat side portion of the access corridor, and a back side of the door facing a back wall of the passage and the secure side portion of the access corridor; a system for translating the door along a major axis of the door passage between an open position in which the access corridor is unblocked, and a closed position in which the door blocks the access corridor, a perimeter of the door extending into the passage beyond all four walls of the corridor in the closed position; and a locking system in the passage configured to push the door, while in the closed position, in a direction perpendicular to the major axis of the passage, and toward the front wall of the passage.