Patent ID: 8220650

Claim:
A drinking cap for a beverage container, comprising: a one-piece moulding of polymeric material defining the drinking cap and including a first tubular portion adapted to connect to a mouth of the beverage container and having a first circular section, a second tubular portion situated at least partially within the first tubular portion and having a second circular section smaller than the first circular section, and a resilient, annular, integral web connecting the first tubular portion with the second tubular portion, wherein said web includes one or more flow openings, the second tubular portion has one end thereof being closed, said one piece moulding drinking cap further comprises a first sealing annular flange connecting the web and an internal surface of the first tubular portion, the first and second tubular portions are coaxial and relatively movable in an axial direction between an open position, in which the flow openings are unobstructed, and a closed position, in which the first sealing flange is in a sealing engagement with the web and the internal surface of the first tubular portion, whereby the flow openings are prevented from communicating with atmosphere by the sealing engagement of the first sealing flange with the web and the internal surface of the first tubular portion, wherein the first sealing flange is integrally connected to an external surface of the web at a point intermediate its ends, as seen in an axial sectional view, or to the internal surface of the first tubular portion whereby, when the cap is in the closed position, a free edge of the first sealing flange defines a substantially line seal with the internal surface of the first tubular portion or the external surface of the web.