Patent ID: 7568659

Claim:
Door designed to be inserted between a cockpit and a cabin of an aircraft, said door having a cockpit side and a cabin side, characterised in that it comprises at least one trapdoor capable of firstly closing off a passageway provided through said door and secondly of opening towards the cabin side of this door, the door also comprising a mechanism for locking/unlocking of the trapdoor at least one arranged on the cockpit side of the door and capable of automatically unlocking the trapdoor at least one when the difference between a cockpit pressure corresponding to the air pressure applied against the cockpit side of said door and a cabin pressure corresponding to the air pressure applied against the cabin side of said door, is greater than a predetermined value, characterised in that the locking/unlocking mechanism is mounted on the trapdoor at least one of the door, the locking/unlocking mechanism comprising: a secondary trapdoor comprising a first surface and a second surface, the first surface being subject to the cockpit pressure, a membrane defining a chamber and being provided with a first end and a second end, the first end being fixed to the second surface of the secondary trapdoor, and the second end being fixed to a portion of the trapdoor at least one provided with at least one through orifice, at least a part of the second surface of the secondary trapdoor subjected to cabin pressure, and means of transmission of movement connected firstly to the secondary trapdoor capable of moving when the cockpit pressure and the cabin pressure are different, and secondly to at least one bolt that cooperates with a trapdoor frame provided on the door and defining said passageway, the secondary trapdoor comprising an upper end and a lower end, the lower end being connectedly hinged onto the trapdoor and the upper end being connectedly hinged to the movement transmission means.