(57) Opening/closing device (1) for a container (100) for pourable products, having at
least one perforable portion (101), said opening/closing device comprising a collar
(2) combinable with said container at said perforable portion, a cap (3) constrainedly
movable by first guiding means (40), which are interposed between said cap (3) and
said collar (2), on the outer surface (2a) of said collar (2), and a cutting element
(5) constrainedly movable by second guiding means (60), which are interposed between
said cutting element (5) and said collar (2), inside said collar (4) for severing
said perforable portion, said device (1) further comprising pushing means (7) for
said cutting element (5), which are actuated by said cap (3) during at least its first
displacement on said outer surface (2a) of said collar (2), for promoting the displacement
inside said collar of said at least one cutting element in the direction of said perforable
portion, wherein said cap (3) is provided with at least one through hole (32) for
pouring said pourable product and with at least one lid (10) integrally constrained
to said cap and adapted to seal, or open, the passage of said at least one through
hole (32), said first guiding means (40) only rotatably constraining said cap (3)
to said collar (2), characterized further comprising means (11) for limiting the rotation
of said cap with respect to the outer surface (2a) of said collar (2) between a first
assembled position (P1) for said opening/closing device and a second locked position
(P2) of said cap (3) on said collar (2), and in that by comprising a retaining ring
(80) integrally constrained at the lower end of said cap by a plurality of frangible
bridges, said frangible bridges being severed at least when said cap is displaced
from said first assembled position
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