| 摘要 |
A spigot for dispensing viscous contents of a container having a filling and dispensing spout comprises an integral elastomeric member having a recessed, transverse diaphragmic wall adapted to fit within the spout and form a seal therewith; an annular radial flange at the outer end of the transverse wall having an arcuate slit therethrough extending a significant angle therearound; and a manipulatable lever on the transverse wall for flexing portions of the wall and the slit portions of the flange to move said portions away from the spout to open the slit and provide a large area dispensing opening through the spigot, the tranverse wall and flange automatically and resiliently snapping back toward spout sealing position upon release of the manipulatable lever. To ensure the integrity, or if sterile, the sterility of the contents until such time as they are to be dispensed, an overlay of thermoplastic or other material may be sealed across and to the flange to cover over and close the slit and facilitate use of the spigot as a drip free shipping cap for a filled container. To minimize passage of atmospheric gases through the spigot, or through any elastomeric closure for the spout, whereby to prevent oxidation of packaged product, an overlay may be provided of gas barrier material and the recess or hollow defined by the transverse wall may be filled with a gas scavenger material or inert gas; or gas barrier material may be placed around the entirety of the spout and closure and sealed to the container.
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