Connection device and connection assembly

A connection device, configured to bring two plates together, one of the two plates being a fixed plate and the other plate being a movable plate, each of the two plates supporting at least one connection element for a hydraulic, pneumatic and/or electrical circuit, said at least one connection element configured to pair with a complementary connection element on the other plate, the connection device being disposed on one of the two plates and comprising:

• a cylinder body extending along a central axis and comprising a main cavity,
• a shaft movable in translation within the cylinder body along the central axis of the cylinder body,
• a piston, integral with the shaft, movable within the main cavity of the cylinder body and dividing the main cavity between a front chamber and a rear chamber,
• wherein the connection device also comprises:
• a sleeve extending around the shaft, this sleeve being movable along the central axis with respect to the cylinder body between a rear position and a front position,
• locking members housed in the sleeve, each locking member being movable relative to the sleeve between a locking configuration where each locking member is spaced from the central axis and a release configuration where each locking member is closer to the central axis than in the locking configuration,
• the shaft being movable along the central axis between:
• a disconnected position in which the shaft does not oppose the movement of the locking members in their release configuration, and the sleeve is in the forward position,
• and a connected position, in which the shaft opposes the movement of the locking members in their release configuration, and the sleeve is in a rear position,
• through an intermediate position between the release position and the connected position, in which the shaft resists movement of the locking members into their release configuration, and the sleeve is in the forward position.