Tamper evident ring for a container closure

Details Tamper evident ring for a container closure Tamper evident ring for a container closure

1997-08-13

1998-10-13

Cronin, Stephen

Bottles and jars

Closures

Frangible member or portion

B65D 4134

Patent

active

058199659

ABSTRACT:
A container closure assembly including a container neck having a first screw thread, a radially projecting bead located below the first screw thread, and one or more ratchet projections located below the radially projecting bead. The container closure further includes a closure having a skirt portion with a second screw thread complementary to the first screw thread for securing the closure on the container neck. A tamper evident ring is joined to the skirt portion by severable connections and includes a generally annular collar for the neck, an opening or recess formed in the collar, wherein a portion of an edge of the opening or recess is attached to a tab. The tab is inclined radially inwardly and obliquely relative to a central axis of the ring and flexes relative to the collar in a radially outward direction. The ratchet projections allow rotation of the tamper evident ring in a screwing direction on the neck, but block rotation of the tamper evident ring in an unscrewing direction by abutment with the tab, whereby, when the closure is initially screwed onto the container neck, the tab flexes outwardly to allow the tamper evident ring to pass over the bead, and then rotates past the ratchet projections as the tamper evident ring is rotated in the screwing down direction. When the closure is unscrewed from the container neck for the first time, the tab abuts against an underside of the bead and also against the ratchet projections to exert axial and circumferential breaking forces on the tamper evident ring.

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