Capping device intended to be fixed on a neck of a container that includes an orifice and an engaging collar, the capping device including: - a cap including an upper wall and an outer peripheral skirt, the outer peripheral skirt having a helical thread intended to cooperate with a helical thread formed on the neck to allow: • an unscrewing of the cap around an axis X to move the cap from a closed position in which the upper wall closes the orifice of the neck and the outer peripheral skirt surrounds said neck towards a released position in which the cap is no longer engaged with the neck; and • a screwing of the cap onto the neck to move the cap from the released position to the closed position; - a lower ring axially fixed to the neck and rotatably movable on the neck around said axis X, said lower ring including a first section that includes engaging elements that radially project into the lower ring and are intended to be arranged below the engaging collar 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 to each other so that the second section rotates with respect to the first section between a lowered position in which the second section is intended to be arranged below the engaging collar and a raised position in which the second section is intended to be arranged at least partially above the engaging collar; - a hinge device that attaches the cap to the second section of the lower ring and is configured to allow the cap to rotate between the released position and an open tilted position in which the cap is released from the orifice of the neck; - the lower ring being configured so that the second section rotates with respect to the first section from the lowered position to the raised position during the movement of the cap from the closed position to the released position and from the raised position to the lowered position during movement of the cap from the released position to the tilted open position; - the first section of the lower ring including a front area that is diametrically opposite to the second section and two engagement areas (20, 21) that are each arranged between the front area of the first section and the second section; being the capping device being characterized in that the engaging elements are arranged only in the two engagement areas (20, 21) to allow a radial movement of the lower ring capable of facilitating the passage of a part of the second section on each side of the engaging collar during the movement of the second section between the lowered position and the released position. - a cap including an upper wall and an outer peripheral skirt, the outer peripheral skirt having a helical thread intended to cooperate with a helical thread formed on the neck to allow: • an unscrewing of the cap around an axis X to move the cap from a closed position in which the upper wall closes the orifice of the neck and the outer peripheral skirt surrounds said neck towards a released position in which the cap is no longer engaged with the neck; and • a screwing of the cap onto the neck to move the cap from the released position to the closed position; • an unscrewing of the cap around an axis X to move the cap from a closed position in which the upper wall closes the orifice of the neck and the outer peripheral skirt surrounds said neck towards a released position in which the cap is no longer engaged with the neck; and • a screwing of the cap onto the neck to move the cap from the released position to the closed position; - a lower ring axially fixed to the neck and rotatably movable on the neck around said axis X, said lower ring including a first section that includes engaging elements that radially project into the lower ring and are intended to be arranged below the engaging collar 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 to each other so that the second section rotates with respect to the first section between a lowered position in which the second section is intended to be arranged below the engaging collar and a raised position in which the second section is intended to be arranged at least partially above the engaging collar; - a hinge device that attaches the cap to the second section of the lower ring and is configured to allow the cap to rotate between the released position and an open tilted position in which the cap is released from the orifice of the neck; - the lower ring being configured so that the second section rotates with respect to the first section from the lowered position to the raised position during the movement of the cap from the closed position to the released position and from the raised position to the lowered position during movement of the cap from the released position to the tilted open position; - the first section of the lower ring including a front area that is diametrically opposite to the second section and two engagement areas (20, 21) that are each arranged between the front area of the first section and the second section;