Patent ID: 7213312

Claim:
Assembly device, for containers made of paper material, comprising: a main fastening element ( 5 ) irremovably connectable to a first laminar element ( 2 a ), said first laminar element ( 2 a ) being an interior side of the container ( 1 ) and allowing the coupling of said first laminar element ( 2 a ) with at least a second laminar element ( 2 b ) of the container ( 1 ), said second laminar element ( 2 b ) being an exterior side of the container ( 1 ); a complementary fastening element ( 6 ) activable on the second laminar element ( 2 b ) in operative conditions and destined to engage at least partially with the main fastening element ( 5 ); a main active portion ( 5 b ) of the main fastening element ( 5 ), said main active portion ( 5 b ) presenting mechanical fastening means extending towards the exterior side of the container ( 1 ) in assembling conditions and destined to engage with the complementary fastening element ( 6 ), said mechanical fastening means comprising a thread ( 9 ), said main active portion ( 5 b ) being shaped according to a prismatic body having a longitudinal axis transverse to the plane of lay of the first laminar element ( 2 a ), said prismatic body comprising at least a locking body ( 7 ) extending outwardly from said prismatic body and destined to be irremovably engaged with the first laminar element ( 2 a ) in operative conditions; and a complementary active portion ( 6 b ) of the complementary fastening element ( 6 ), the complementary active portion presenting interconnection means extending towards the interior side of the container ( 1 ) in assembling conditions and destined to engage the mechanical fastening means of the main active portion ( 5 b ), said interconnection means comprising a hollow prismatic body having in its interior a helical groove ( 10 ) counter shaped relative to the thread ( 9 ).