B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 50/04 (2006.01) B29C 33/42 (2006.01) B65D 55/06 (2006.01)
Patent
CA 2121279
A closure has a central portion with a periphery and a skirt extending from the periphery, a tear strip extending from the skirt, a tamper evident band extending from the tear strip and a movable flange extending from the band. The flange is hinged so that the tamper evident band has equally spaced windows in it to make it flexible so that it can be stretched over the ring with a very small tolerance or even a negative tolerance relative to the ring. Once the flange has overridden the ring, a free edge of the flange moves inward to rest against an outer surface of the neck beneath the ring. The closure can then not be removed from the container without first severing the tabs as the flange will not override the ring during removal of the closure. The tabs are severed by manually grasping a handle of the tear strip and removing the tear strip. When the tear strip is removed, the closure functions in a conventional manner for opening and closing the container. The screw thread on the closure is made up of elongated bubbles located end to end. A core for a mold to make the closure containing the bubbled screw threads can be manufactured using a ring-shaped electrode having a cylindrically-shaped inner surface. The electrode is connected to a high voltage source and mounted in an electrical discharge machine, there being a contact point on said inner surface for each bubble to be formed in said screw thread. With previous devices, the closure contains conventional screw threads and dusting is a major problem or, the flange does not contain windows and cannot be manufactured on a large scale with appropriate tolerances.
Pano Cap (canada) Limited
Schnurr Daryl W.
LandOfFree
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