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 that is axially subdivided into an anchor section for anchoring the body to the 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 the outside with an anchor member that has an anchoring state and a releasing state, that is associated with a cover mounted on the body so as to have both an actuation end for actuating the anchor member and a drive end, and so as to be movable between an inactivation position towards the drive end and an activation position towards the actuator end, 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 holder means for holding it in the inactivation position, which holder means are 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 communication means for putting the chamber into communication with the well, the cover presenting a section that is greater beside the chamber than its section beside the well.