| 摘要 |
<p>A dispensing cap constitutes a one-piece moulding of polymeric material including a first circular section tubular portion (2) of relatively large diameter for connection to a beverage container and a second circular section tubular portion (6) of relatively smaller diameter. One end of the larger tubular portion (2) is connected to one end of the smaller tubular portion (6) by a resilient, annular integral web (4), in which one or more flow openings (18) are formed. The width of the web (4) is greater than the difference between the radii of the larger and smaller tubular portions. The other end of the smaller tubular portion (6) is closed. The smaller tubular portion carries a peripheral flange (20) whose radius is equal to or greater than that of the first tubular portion (2). The two tubular portions are coaxial and relatively movable in the axial direction between an open position, in which the smaller tubular portion is located outside the larger tubular portion and the flow openings are unobstructed, and a closed position in which the said one end of the smaller tubular portion is located within the said one end of the larger tubular portion and the peripheral flange (20) is in sealing engagement with the said one end of the larger tubular portion, whereby the flow openings (18) are prevented from communicating with the atmosphere.</p> |
