Twist open closure having inclined frangible membrane

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 51/20 (2006.01) B65D 41/34 (2006.01)

Patent

CA 2714306

A closure for a container having an opening includes a base cap and an overcap that form a chamber adjacent the opening which is sealed from the contents of the container by a frangible membrane having an inclined line of weakness and by a hinge member having a pocket extending downward adjacent lower and upper terminuses of the line of weakness. The overcap in-cludes a cutting member received within the pocket that severs the line of weakness upon substantial rotation of the overcap with respect to the base cap. A pushing member may cooperate with a cam member to deflect open the membrane upon severance. The pocket may include a stop for the cutting member. The base cap may include a cylindrical structure having an upwardly inwardly projection member to form a seal with an thickened upper portion of the overcap skirt to protect against penetration into the cham-ber.

L'invention concerne un bouchon destiné à un contenant ayant une ouverture comprenant un bouchon de base et un surbouchon qui forme une chambre adjacente à l'ouverture qui est étanchéifiée vis-à-vis du contenu du contenant par une membrane cassante ayant une ligne de faiblesse inclinée, et par un élément d'articulation ayant une poche s'étendant vers le bas adjacente aux terminaisons inférieure et supérieure de la ligne de faiblesse. Le surbouchon comprend un élément coupant reçu dans la poche, qui découpe la ligne de faiblesse lors d'une rotation importante du surbouchon par rapport au bouchon de base. Un élément pousseur peut coopérer avec une came pour déformer la membrane ouverte lors de la découpe. La poche peut comprendre une butée pour l'élément coupant. Le bouchon de base peut comprendre une structure cylindrique ayant un élément faisant saillie vers le haut et vers l'intérieur pour former un joint d'étanchéité avec une partie supérieure épaissie de la jupe de surbouchon afin d'offrir une protection contre une pénétration dans la chambre.

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