Patent ID: 8365933

Claim:
A closure system that comprises a dispensing closure ( 200 ) and a spout ( 600 ) of a container or for a container, on which the dispensing closure ( 200 ) can be attached, wherein the dispensing closure ( 200 ) is designed as a rebounding closure, wherein the spout ( 600 ) comprises an essentially cylindrical dispensing element ( 610 ) with a dispensing opening ( 620 ), the outside of which is provided with at least one threaded segment ( 622 ), and the dispensing closure ( 200 ) comprises an essentially cylindrical snap-on pipe ( 220 ), the inner side of which is provided with at least one threaded segment ( 222 ) for interacting with the at least one threaded segment ( 622 ) of the dispensing opening ( 620 ), characterized in that the outside of the dispensing element ( 610 ) is provided with at least one forcing device ( 640 ), which is designed to engage at least one recess ( 240 ) of the snap-on pipe ( 220 ) so as to force the dispensing closure ( 200 ) to move in an axial direction when turning the dispensing closure ( 200 ) attached to the spout ( 600 ), so that the at least one threaded segment ( 222 ) of the snap-on pipe ( 220 ) is pressed over the at least one threaded segment ( 622 ) of the dispensing element ( 610 ), thereby releasing the dispensing closure ( 200 ) from the spout ( 600 ); and wherein the at least one recess ( 240 ) comprises a first side ( 250 ) and a second side ( 260 ), which converge at a vertex ( 242 ) or vertex area, wherein the gradients of the first and second side of the recess ( 240 ) are designed in such a way that a gradient on one of the first and second sides is smaller at least at one point than the gradient on the other of the first and second sides at a point lying at the same axial height.