Lightened, molded plastic closure exhibiting enhanced strength

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 41/04 (2006.01) B65D 50/00 (2006.01) B65D 55/02 (2006.01)

Patent

CA 2661474

A lightened, molded plastic closure (10) exhibiting enhanced strength includes a top wall portion (12), and an internally threaded (16), depending annular skirt portion (14). The interior surface of th skirt portion, below the closure thread, defines an array of alternating grooves (18) and lands (20), which together define a plurality of circumferentially spaced, vertically extending strengthening ribs on the inside surface of the skirt portion. The skirt portion thus exhibits desirably enhanced column strength, thereby facilitating efficient formation by "stripping" from an associated core pin during molding. In the preferred form, the exterior surface of the skirt portion is provided with a plurality of circumferentially spaced gripping knurls (22) respectively aligned with the grooves defined at the interior surface of the skirt portion.

L'invention concerne une fermeture en plastique moulé allégée offrant une robustesse renforcée, ladite fermeture comportant une partie de paroi de dessus et une partie de rebord annulaire à filetage intérieur qui en dépend. La surface intérieure de la partie de rebord, située sous le filetage de la fermeture, définit un réseau de rainures et de méplats alternés formant ensemble une pluralité de nervures de renforcement s'étendant verticalement et espacés circonférentiellement sur la surface intérieure de la partie de rebord. La partie de rebord présente ainsi une résistance accrue à la flexion par compression axiale, ce qui en facilite la réalisation par démoulage vis-à-vis d'un noyau associé. Dans un mode de réalisation préféré, la surface extérieure de la partie de rebord est dotée d'une pluralité de stries de préhension espacées circonférentiellement, respectivement alignées sur les rainures définies au niveau de la surface intérieure de la partie de rebord.

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