Closure device for bags or pouches

Claim 1

A closure device operable between an open and a closed position for sealing a bag or a pouch comprising a first panel, a second flexible panel, a hinged connection between adjacent edges of said two panels, a lip at an end of said first panel in facing relationship to said hinged connection, a free end on said second panel opposite said hinged connection, said second panel having a dimension between said hinged connection and said free end which is greater than the distance between said hinged connection and the inside of said lip, said free end adapted to be received in tight abutting engagement with the inside of said lip when said closure device is moved to the closed position whereby said second panel is placed under stress, by reversing the position of its center relative to its ends, wherein said second panel has an intermediate hinge parallel to said hinged connection with said first panel and said second panel is movable about said hinges between an open position in which said intermediate hinge is remote from said concave face of said first panel and a closed position in which said intermediate hinge is adjacent said concave face of said first panel and said free edge of said second panel is engaged within said lip of said first panel, so that a portion of the bag or pouch positioned between the inside of said lip and said free edge of said second panel is sealed by the force exerted by said second panel against the inside of said lip.