Break-away safety cap for containers

In a screw-type closure device made of a plastic material of the type having a cap with a skirt the bottom of which is associated with an annular guarantee strip which includes a bead for cooperatively engaging the neck of a container to prevent removal of the cap, the closure device comprising:

• the guarantee strip having a first ring connected to the bottom of the skirt by frangible bridge elements which are separated by spaces and a second ring connected to the first ring by a peripheral zone of reduced thickness whereby the second ring may be turned up inside the first ring, the second ring being divided into at least two independent segments separated by gaps, and the first ring of the guarantee strip having at least one oblique groove of reduced thickness formed therein opposite one of said gaps in the second ring, the bridge elements being ruptured upon the removal of the cap from the container thereby separating the guarantee strip from the skirt of the cap and, the first ring of the guarantee strip being severed along said oblique groove thereby releasing the guarantee strip from the container upon removal of the cap from the container.