Patent ID: 7666072

Claim:
Device for constricting a tube ( 2 ) filled with filling, which device comprises several pairs ( 3 , 4 ) of displacement members ( 31 , 32 , 41 , 42 ), in which a) the displacement members of each pair ( 3 , 4 ) overlap one another to enclose an opening ( 33 , 43 ), b) both displacement members ( 31 , 32 , 41 , 42 ) adjoin the enclosed opening ( 33 , 43 ) at two overlap points ( 34 , 35 , 44 , 45 ) per pair, c) the displacement members ( 31 , 32 , 41 , 42 ) are designed for a linear constriction movement that alters the size of the openings ( 33 , 43 ), and d) the openings ( 33 , 43 ) lying one behind the other in the axial direction of the tube together enclose a passage, characterized in that the openings ( 33 , 43 ) are not congruent with the passage, and in that the overlap points ( 34 , 35 , 44 , 45 ) are spaced apart from the passage during the greater part of the constriction movement.