Patent ID: 7631529

Claim:
A selective and progressive locking device ( 10 ) for metal containers ( 18 ) to undergo deformation mechanical operations along a side surface extended part and provided on the bottom with a notch ( 20 ), said device comprising: a circular plan support ( 12 ) with an end forming a mouthpiece ( 14 ) to seat a containment body ( 16 ); a shaped and mobile ring ( 22 ) eventually cooperating with a seal or annular membrane ( 24 ) placed at the mouthpiece in which containers ( 18 ) are inserted starting from respective bottom; a centering collar ( 26 ) that defines the mouthpiece in which containers ( 18 ) are inserted and that circumscribes seal ( 24 ); a centering ring ( 30 ) whose anterior front towards containers ( 18 ) shows complimentary conformation to the bottom periphery of containers themselves; a pusher tensioned by a helical spring ( 34 ), disposed along a longitudinal axis of said device ( 10 ); means adapted to realize perfect adherence with the container ( 18 ) bottom provided with a notch ( 20 ); wherein elastic means ( 42 ) are disposed between said containment body ( 16 ) and support ( 12 ), and said centering ring ( 30 ) is provided with a plurality of through holes cooperating with a vacuum to stabilize said containers ( 18 ).