Door assembly allowing sealed transfer between two enclosed volumes

A door arrangement allowing sealed transfer between a first and a second enclosed volume, comprising

• a flange arranged to define a passage opening in the first enclosed volume, the passage opening defining an opening plane and a passage axis perpendicular to the opening plane;
• and
• a door hingedly mounted on the flange so as to move between a closed position, in which the door closes the passage opening, and an open position in which the door is completely clear of the passage opening,
• characterized in that the door is fastened to the flange by a double-joint linkage mechanism comprising a first joint arranged to allow rotational movement of the door about an axis perpendicular to the passage axis to move the door from the closed position to a partially open position in which the door extends in an inclined plane having an angle of inclination of at most 30 degrees with respect to the plane of the passage opening and a second joint arranged to allow rotational movement of the door kept in the inclined plane about an axis parallel to the passage axis, the first and second joints being arranged with the door so that the opening of the door takes place first by the rotational movement about the axis perpendicular to the passage axis so that the door is in the partially open position, then secondly by the rotational movement about the axis parallel to the passage axis so as to move the door from the partially open position to the fully open position.