Coupling device fitted with instantaneous or quasi-instantaneous anchor means

A coupling device for coupling a duct end to an element of a fluid-transport circuit, the coupling device comprising:

• a tubular body defining a channel, the channel being axially subdivided into an anchor section for anchoring the body to an inside wall of a well of the circuit element and a connection section for connection to the duct end, the anchor section being provided on an outside with an anchor member that has an anchoring state and a releasing state, the anchor member being configured to cooperate with a cover mounted on the body, the cover having an actuation end for actuating the anchor member and a drive end and being movable away from the anchor member to an inactivation position and towards the anchor member to an activation position,
• a resilient return member for urging the cover into the activation position being mounted in a chamber defined by the cover and the body,
• wherein the cover includes a holder device configured to hold the cover in the inactivation position, which holder device is arranged to be declutchable when the cover is moved into a declutching position beyond its inactivation position away from the activation position, and
• wherein the device includes a passage configured to put the chamber into communication with the well, the cover having a cross section beside the chamber that is greater than a cross section beside the well.