초록

Closure systems including a container having an annular projection integral with the lip of the container having a curled free end portion for engaging a cap and methods of forming and using the same.

대표청구항 ▼

A container and cap for receiving, housing and discharging a product wherein: (a) said container comprises: (1) an opening for receiving or discharging the product, (2) a neck surrounding the opening including a rim, and (3) a flexible, plastic annular projection integral with and extending from sai

A container and cap for receiving, housing and discharging a product wherein: (a) said container comprises: (1) an opening for receiving or discharging the product, (2) a neck surrounding the opening including a rim, and (3) a flexible, plastic annular projection integral with and extending from said rim having a curled free end portion for sealingly engaging the cap as the cap is placed on said neck to close the container; and (b) said cap comprises: (1) a top wall, and (2) an outer peripheral skirt depending from said top wall, including an inner substantially annular surface, an annular bead projecting inwardly from said inner surface at the lower end of said skirt adapted to snap past and engage said flexible, plastic annular projection of the container to close the cap on the container with said flexible, plastic annular projection in engagement with said inner surface, and at least one thread about said inner surface between said bead and top wall and projecting outwardly from said inner surface to engage and form at least one substantially matching groove in said flexible, plastic annular projection whereupon the cap thereafter can be twisted off and on the container because of engagement between said engaging threads on the cap and in said flexible, plastic annular projection of the container.