Patent ID: 8206034

Claim:
An opening mechanism for use with a fluid filled collapsible container, the mechanism comprising: a) an outlet spout adapted to be joined to a wall of the collapsible container, the outlet spout having an inside surface; b) a perforator for opening the collapsible container through the outlet spout; and c) a driver having a passage therethrough, the driver comprising i) a screw thread, and ii) a spigot extending forward of the screw thread, and engageable with the perforator, the spigot having an outer circumferential surface, the driver adapted to be received within the outlet spout and screw threadedly engageable therewith for advancement by relative rotation thereof to drive the perforator through the outlet spout to thereby open the collapsible container and permit fluid to be dispensed through the passage; wherein a circumferential flexible seal is provided within the outlet spout to engage with the spigot to reduce leakage of fluid between the outlet spout and the spigot as the collapsible container is opened; and wherein the circumferential flexible seal is a fin seal, and extends from the inside surface of the outlet spout, and the circumferential flexible seal is adapted to contact around the entire outer circumferential surface of the spigot, and to deform as the driver is advanced toward the collapsible container.