Patent ID: 7036683

Claim:
In a closure device ( 1 ) of plastic, which can be applied over an area of a closed container (B) that can be punctured, wherein the closure device ( 1 ) has a spout-shaped lower element ( 2 ) with a cylindrical pouring spout ( 20 ), and is connectible with the container (B), and a screw cap ( 4 ) which can be screwed on the lower element ( 2 ), a cylindrical piercing element ( 3 ) open at both ends in an axial direction and displaceably seated in the lower element ( 2 ), during an unscrewing movement act of the screw cap ( 4 ) on the piercing element ( 3 ) the piercing element ( 3 ) being moved downward into the container (B) through the area (S) which can be punctured, the improvement comprising: on a cylindrical inner wall ( 30 ) the piercing element ( 3 ) having at least one catch element ( 34 ) acting together with at least one catch rib ( 45 ) or catch groove ( 44 ) of the screw cap ( 4 ), during rotating movement of the screw cap ( 4 ) the piercing element ( 3 ) rotating, and a positive connection ( 24 , 31 ) between the cylindrical pouring spout ( 20 ) of the lower element ( 2 ) and the cylindrical piercing element ( 3 ) moving the piercing element ( 3 ) helically downward during a first unscrewing movement of the screw cap ( 4 ), wherein the positive connection at the cylindrical wall ( 30 ) of the piercing element ( 3 ) includes a slideway which protrudes in a helical manner, the positive connection at the cylindrical pouring spout ( 20 ) includes a helical guide curve cut into a wall of the pouring spout ( 20 ), and each of the slideway and the helical guide curve including a surface that lies flat on top of a corresponding surface of the other of the slideway and the helical guide curve.