Screw-on stopper cap, having a tamper-proof band

Claim 1

A screw-on stopper cap for a bottle with a neck which has threads and a counter-ring arranged beneath the threads, the cap comprising: a top portion; an annular side skirt formed integrally with said top portion and having internal threads which communicate with the threads of the neck; an annular anti-tamper collar disposed beneath a bottom surface of said skirt and including a downwardly extending section and a plurality of inwardly facing articulated tabs of constant cross section which are integrally connected to a bottom of said section, said tabs comprising a first curved part connected to the bottom of said section and a second rectilinear part which is joined to said first part by a joining portion and contiguous with an inner surface of said section; and a plurality of breakable bridges connected at one end to the bottom surface of said skirt and at another end to a top portion of said section; wherein when the cap is unscrewed from the bottle the joining portion between said first part and said second part abuts against the counter-ring of the neck, thereby applying a force to the inner surface of said section which breaks said bridges.