Patent ID: 8376163

Claim:
A beverage container comprising a receptacle which has a central axis and is sealed by a lid of resilient material, the receptacle including a neck defining an opening and the lid including a closure plate, integral with which is a depending skirt extending around the outer surface of the neck, the skirt carrying an annular flange, which is in sealing engagement with the underside of a downwardly directed annular shoulder on the outer surface of the neck, wherein the annular flange is connected to the skirt by a hinge connection, the annular flange is elongate in axial sectional view, the end surface of the free end of the annular flange is in sealing engagement with the underside of the shoulder, and the internal surface of the skirt carries an annular protuberance which is in sealing engagement with one side surface of the annular flange, the other side surface being in sealing engagement with the outer surface of the neck, whereby an annular chamber is defined by the inner surface of the skirt, the said one side surface of the annular flange, the protuberance and the hinge, a gas passage being provided which extends between the annular chamber and atmosphere, characterised in that the said one side surface of the annular flange includes an annular portion which extends downwardly and inwardly and is in contact with a corresponding annular portion of the surface of the annular protuberance.