Plastic closure with anti-backoff teeth on its threads

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 41/04 (2006.01) B65D 41/34 (2006.01) B65D 51/16 (2006.01)

Patent

CA 2379574

A closure (10) for a container having carbonated or otherwise pressurized contents includes a top wall portion, and an annular depending skirt portion (16). An internal thread formation (18) mates with a like thread formation (T) of an associated container (C). To facilitate gas venting during closure removal, the container (C) includes a plurality of axially extending vent grooves (G). Release of gas pressure during closure removal is facilitated by providing the closure (10) with at least one, and preferably a plurality of rotation-inhibiting projections (40) positioned adjacent to the internal thread formation (18). The projections (40) interferingly engage with the vent grooves (G) of the associated container (C), thus providing increasing frictional drag during closure removal to permit dissipation of gas pressure from within the container.

L'invention porte sur un dispositif de fermeture (10) d'un réceptacle renfermant un contenu carboné ou sous pression. Ce dispositif de fermeture comprend une partie de paroi supérieure et une partie (16) jupe solidaire annulaire. Une forme (8) filetée interne s'accouple à une autre forme (T) filetée d'un réceptacle (C) associé. Pour faciliter la fuite du gaz lors du retrait du dispositif de fermeture, le réceptacle (C) comporte une pluralité de gorges (G) d'évacuation s'étendant axialement. La libération de la pression gazeuse lors du retrait du dispositif de fermeture est facilitée du fait que le dispositif de fermeture (10) est doté d'au moins une, de préférence plusieurs parties saillantes (40) empêchant la rotation et positionnées à côté de la forme (18) filetée interne. Les parties saillantes (40) viennent en contact par interpénétration avec les gorges (G) d'évacuation du réceptacle (C) associé, ce qui entraîne une augmentation de la résistance de frottement lors du retrait du dispositif de fermeture et permet la dissipation de la pression gazeuse dans le réceptacle.

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