Patent ID: 8281944

Claim:
An anti-tamper closure for containers having a neck and a mouth with an outer thread on the neck and with a projection disposed below the thread, the closure comprising: an outer capsule comprising an outer cap and an outer skirt, and an inner pre-threaded element suitable for closing the mouth of the container, comprising an inner cap having an inner thread suitable for engaging the outer thread of the container and an inner annular element, in which: the outer cap is connected to the inner cap in a manner such as to allow the closure to be opened and closed normally, the outer skirt is connected to the outer cap by outer connection means which, after initial opening, render the outer skirt free to rotate and to translate relative to the outer cap, the inner annular element is connected to the inner cap by inner connection means which, after initial opening, render the inner annular element free to rotate and to translate relative to the inner cap, the inner annular element is connected to the outer skirt with respect to translation by retaining means projecting inside the closure, and the outer skirt extends longitudinally towards the container beyond the retaining means.