DISPENSING CAPS FOR LIQUID CONTAINERS

摘要

A dispensing cap for a beverage container constitutes a one-piece moulding of plastic material including a first circular section tubular portion (2) with first radius for connection to the mouth of the container and a second circular section tubular portion (6) with a second smaller radius. One end of the first tubular portion is connected to one end of the second tubular portion by a resilient annular integral web (4), in which one or more flow openings (18) are formed. The width of the web is equal to or greater than the difference between the first and second radius. The other end of the second tubular portion (6) is closed. One of the web (4) and the internal surface of the first tubular portion adjacent the said one end thereof is connected to a projecting annular first sealing flange (20). The first and second tubular portions (2, 6) are co-axial and relatively movable in the axial direction between an open position, in which the second tubular portion (6) is located outside the first tubular portion (2) and the flow openings are unobstructed, and a closed position, in which the said one end of the second tubular portion is located within the said one end of the first tubular portion and the sealing flange (20) is in sealing engagement with the other of the web (4) and the internal surface the first tubular portion (2), whereby the flow openings (18) are prevented from communicating with the interior of the first tubular portion by the sealing engagement of the first sealing flange (20) with the other of the web (4) and the internal surface of the first tubular portion (2). The said other end of the said second tubular portion (6) carries a radially projecting circumferential flange (16). One or more flow opening (17) are formed in the circumferential flange. The moulding further includes two half shells (42) of semi-cylindrical shape, the upper edge of each of which is integral with and sealed to the circumferential flange (16) and the lower edge of which forms a sliding seal with a first tubular portion (2). Each side edge of each half shell forms a seal with a side edge of the other half shell, whereby defined within the two half shells (42) there is a liquid flow space with which the flow openings (18, 17) in the web (4) and in the circumferential flange communicate.