(57) Improved security closure device for containers of the kind comprising a stopper
(1) having a thread (2) for its cooperation with the neck (12) of a container, this
neck having in turn a corresponding thread (5), corresponding means being provided
on said elements of the stopper and of the neck, which in the operating position of
the closure device create a difficulty against the opening, which cannot be overcome
by children, essentially characterized in that the stopper body comprises in diametral
areas of its internal side wall and in parallel direction some projections (3) decreasing
to one of their ends, which in the position of complete screwing of the stopper are
facing by their projecting ends against second projections (6) of similar configuration,
provided in the external wall of the container neck (12), these two kinds of projections
operating as retaining means of which the interaction causes the stopper to be blocked.
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