Capping device intended to be fixed to a neck of a container that includes a dispensing orifice, a helical thread and an engaging flange, the capping device including: - a lower ring intended to be mounted axially fixed on the neck and mobile in rotation around an axis X, said lower ring including a first section that includes some engaging areas (20, 21) each including at least one engaging element that protrudes radially towards the interior of the lower ring and is intended to be arranged below the engaging flange in order to axially retain the lower ring on the neck of the container and a second section, the first section and the second section of the lower ring being articulated with each other so that the second section pivots with respect to the first section between a lowered position in which the second section is intended to be arranged below the engaging flange and a raised position in which the second section is intended to be arranged at least partially above the engaging flange, - a cap including an upper wall and an external peripheral skirt, the external peripheral skirt having a helical thread intended to cooperate with the helical thread of the neck in order to allow the movement of the cap between a closed position and a released position in which the helical thread of the cap is no longer engaged with the helical thread of the neck; • an articulation device including two sheets (11, 12) that connect the outer peripheral skirt and the second section and configured to allow the cap to pivot between the released position and a tilted open position in which the cap is released from the dispensing orifice of the neck; the second section of the lower ring being able to be positioned in the lowered position when the cap is in the tilted open position; the capping device further including a locking device configured to lock the cap when it is in the tilted open position, said locking device including: • a stop that protrudes radially outwards, from the external peripheral skirt, and is arranged circumferentially between the two sheets (11,12) of the articulation device; and • a protruding portion protruding axially from a central portion of the second section of the lower ring, between the two sheets (11,12) of the articulation device; • the stop and the protruding portion being configured in such a way that, when the cap is in the tilted open position and the second section of the lower ring is in the lowered position, the stop abuts against the protruding portion, characterized in that the outer peripheral skirt includes a heel that protrudes axially towards the protruding portion between the two sheets (11, 12), the protruding portion having a radial thickness ε1 greater than a radial thickness ε2 of the first section of the lower ring outside some engaging areas (20, 21) and having recesses that open opposite the heel. - a lower ring intended to be mounted axially fixed on the neck and mobile in rotation around an axis X, said lower ring including a first section that includes some engaging areas (20, 21) each including at least one engaging element that protrudes radially towards the interior of the lower ring and is intended to be arranged below the engaging flange in order to axially retain the lower ring on the neck of the container and a second section, the first section and the second section of the lower ring being articulated with each other so that the second section pivots with respect to the first section between a lowered position in which the second section is intended to be arranged below the engaging flange and a raised position in which the second section is intended to be arranged at least partially above the engaging flange, - a cap including an upper wall and an external peripheral skirt, the external peripheral skirt having a helical thread intended to cooperate with the helical thread of the neck in order to allow the movement of the cap between a closed position and a released position in which the helical thread of the cap is no longer engaged with the helical thread of the neck; • an articulation device including two sheets (11, 12) that connect the outer peripheral skirt and the second section and configured to allow the cap to pivot between the released position and a tilted open position in which the cap is released from the dispensing orifice of the neck; the second section of the lower ring being able to be positioned in the lowered position when the cap is in the tilted open position; • a stop that protrudes radially outwards, from the external peripheral skirt, and is arranged circumferentially between the two sheets (11,12) of the articulation device; and • a protruding portion protruding axially from a central portion of the second section of the lower ring, between the two sheets (11,12) of the articulation device; • the stop and the protruding portion being configured in such a way that, when the cap is in the tilted open position and the second section of the lower ring is in the lowered position, the stop abuts against the protruding portion, characterized in that