Sealed connection device between two enclosed volumes with improved security

An assembly including a first enclosed volume and a sealed connection device between the first enclosed volume and a second enclosed volume, the first enclosed volume including a first flange and a first door sealingly closing an opening delimited by the first flange, and the second enclosed volume including a second flange and a second door sealingly closing a second opening delimited by the second flange, the second door being secured to the second flange by a bayonet connection, said connection device being mounted on a wall of the first enclosed volume and comprising:

• first means for securing the first and second flanges to each other,
• second securing and disengaging means intended to sealingly secure the second door and the first door and to disengage the second door from the second flange, the second means including a securing plate mounted movable in rotation on an outer face of the first door about a longitudinal axis and capable of being secured to an outer face of the second door by a bayonet connection, said securing plate being such that a first part of the rotational displacement of the securing plate is intended to secure the first door and the second door and a second part of the rotational displacement of the securing plate is intended to unlock the second door relative to the second flange,
• third means for releasing the first door relative to the first flange,
• fourth means for opening a passage between the first and the second enclosed volume,
• a control ring capable of being rotated about the longitudinal axis, the rotation of said control ring actuating at least the second, third and fourth means,
• the assembly also including means for immobilising the securing plate relative to the first door in a first position in the absence of the second door and in a second position in the presence of the second door in a state wherein the first door and the second door are secured and the second door is unlocked relative to the second flange,
• a first device for actuating said control ring and
• a second device for actuating the first securing means.