Bottles and jars – Closures – Cap type
Patent
1994-08-02
1995-10-31
Shoap, Allan N.
Bottles and jars
Closures
Cap type
215218, 215223, 220240, 220296, 220316, B65D 4104, B65D 5502
Patent
active
054621860
ABSTRACT:
A mating closure and finish system particularly adapted for use with containers, e.g. bottles containing carbonated beverages which generate gas in the bottle headspace and where the bottle finish incorporates at least two equally spaced helical cam tracks. The closure is comprised of plural sets of cam followers which fit into the cam tracks and where the cooperation between the cam tracks and cam followers produces an axial movement of the closure as it is rotated on the finish. For a two track system, which is the preferred embodiment, each track starts 180.degree. from each other and makes at least one full turn around the circumference of the finish. Also included are intervening stops and tapered speed bumps that contact and impede the cam follower(s) in the cam tracks during closure removal to effect a delay. Raised thread segments which define the cam tracks are intersected by a plurality of vertical venting slots or pathways along their helical length to vent headspace gas. Longitudinally extending grooves are located in raised thread segments on either side of the cam tracks and couple with the vertical venting slots to provide a continuous venting conduit of the headspace gas. Anti-backoff devices are furthermore provided which operate when the closure is seated on the finish to keep the closure from backing off the finish and leaking prior to closure removal.
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Exley Timothy R.
Ladina Joseph M.
Szedon William A.
Newhouse Nathan J.
Shoap Allan N.
The Coca - Cola Company
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