Abstract: The present invention relates to a closing ring closure device for a closing ring with a closing lever and a one-piece or two-piece traction bracket, each of which are pivotably mounted by means of pivot bearings on a pivot bearing base on the closing ring side, wherein the traction bracket and the closing lever are pivotably connected to one another by means of a further pivot bearing. For automation in production technology and for the use of mechanical closing ring closure devices, e.g. on automatic filling lines, it is very advantageous if the two components closing lever and traction bracket are provided with special constructive means which are designed in a mutually coordinated functional mode between the two components as a snap-fit device for fixing the closing ring closure device in wide-open closing lever position.