Tamper evident tube closure with twist-away centering
Disclosed herein is a tamper evident closure for a container having a cap on a spout. The inverted cap can be used as a tool for removing a twist away element. Both, the cap and the spout have conic guiding surfaces, which center the cap in respect to the spout, while it is removed towards and onto the spout. The initial opening of the tamper evident closure is therefore easier.
1. A tamper evident closure for containers, wherein the closure comprises a spout with a twist away element and a removable cap, wherein the cap comprises a wrench or a socket, such that the cap can be used as a tool for twisting away said twist away element and thereby creating a opening in the spout, wherein the wrench or socket is, while the spout is closed by the cap, on a side of the cap opposite the spout, such that the cap is to be inverted when being used as a tool for twisting away the twist away element, wherein the closure comprises a centering-aid, which centers the cap while it is moved, with the wrench or socket first, towards and onto the spout, characterized in that the centering-aid comprises a first guiding surface on the spout and a second guiding surface on an inner surface of the cap and inwardly extending into the cap such that the wrench or socket is an inward continuation of the second guiding surface, wherein the first guiding surface rotatably mates with the second guiding surface, once the cap is pushed completely with the wrench or socket first onto the spout.
2. The closure according to claim 1 wherein the first guiding surface and the second guiding surface are substantially conic.
3. The closure according to claim 1 wherein the first guiding surface is formed on an outer surface of the spout between a rim at a distal end of the spout and the container.
4. The closure according to claim 1 wherein the twist away element has the form of a pin or a star.
5. The closure according to claim 1 wherein the wrench or socket matches at least at some points the form of the twist away element, such that transmission of a torque is possible.
6. The closure according to claim 1 wherein the spout comprises a first thread and the cap comprises a second thread, wherein the first thread and the second thread are designed to match each other, and the first thread is an outside thread and the second thread is an inside thread.
7. The closure according to claim 1 wherein the outer diameter of the cap is substantially larger than the diameter of the spout and the wrench or socket, wherein the cap has a circular recess around the socket.
8. The closure according to claim 1 wherein the spout is designed as cannula.
9. The closure according to claim 1 comprising a predetermined breaking line between the spout and the twist away element, which predetermined breaking line is arranged substantially inside the spout or countersunk in respect to a rim at the distal end of the spout.
10. The container, comprising a closure according to claim 1 .
11. The closure according to claim 1 , wherein a symmetry axis of the socket coincides with a symmetry axis of the cap.
12. The closure according to claim 1 , wherein the first guiding surface and the second guiding surface are substantially spherical.
13. The closure according to claim 1 , wherein the second guiding surface is formed on an inner surface of the cap such that the socket is an inward continuation of said second guiding surface.
14. The closure according to claim 1 , wherein the twist away element has a multi-fold symmetry.
15. The closure according to claim 14 , wherein the twist away element has a three-fold, four-fold, five-fold, six-fold, seven-fold or eight-fold symmetry.
16. The closure of claim 7 , wherein the circular recess is open toward the same side as the socket.
17. A tube comprising the closure of claim 1 .