초록 ▼

A closure for a container with a neck portion and an external helical thread formed on the neck portion includes an upper wall and a skirt formed integrally with and extending generally downwardly from the upper wall. An internal helical thread is formed on the skirt for engaging the external helica

A closure for a container with a neck portion and an external helical thread formed on the neck portion includes an upper wall and a skirt formed integrally with and extending generally downwardly from the upper wall. An internal helical thread is formed on the skirt for engaging the external helical thread of the neck portion to thereby secure the closure to the container. The internal helical thread is preferably asymmetrical in cross section. A first annular seal extends generally radially inwardly toward a central axis of the closure from the inner skirt surface. The first annular seal sealingly engages the outer surface of the neck portion. A second annular seal extends generally axially downwardly from the upper wall and sealingly engage an inner surface of the neck portion. A thickness of the neck portion between the first and second annular seals is greater than the distance between the first and second annular seals before installation of the closure on the container. When the closure is installed on the container, the first and second annular seals are biased toward each other and against the outer and inner surfaces, respectively. A third annular seal is provided on a lower surface of the upper wall between the first and second annular seals for engaging an upper edge of the container neck portion. A tamper-evident security ring is frangibly connected to the skirt and includes a plurality of tabs that prevent removal of the security ring from the container.

대표청구항 ▼

1. A closure for connection to a container with a neck portion and an external helical thread formed on an outer surface of the neck portion, the closure comprising:an upper wall; a skirt formed integrally with and extending generally downwardly from the upper wall, the skirt having an inner skirt s

1. A closure for connection to a container with a neck portion and an external helical thread formed on an outer surface of the neck portion, the closure comprising:an upper wall; a skirt formed integrally with and extending generally downwardly from the upper wall, the skirt having an inner skirt surface with an internal helical thread formed thereon for engaging the external helical thread of the neck portion to thereby secure the closure to the container, the internal helical thread being of asymmetrical shape in cross section and having: a crown spaced from the skirt inner surface; an upper thread surface extending generally upwardly and away from the crown to the skirt inner surface; and a lower thread surface extending generally downwardly and away from the crown to the skirt inner surface; a radius of the upper thread surface being greater than a radius of the lower thread surface to thereby form the asymmetrical shape, the upper thread surface being shaped to sealingly engage a lower surface of the external helical thread to thereby hold the closure on the container against relatively high internal container pressure acting on the closure; a first annular seal on the inner skin surface and extending generally radially inwardly toward a central axis of the closure from the skirt, the first annular seal having a first apex area that is adapted to sealingly engage the outer surface of the neck portion; and a second annular seal extending generally downwardly from the upper wall, the second annular seal having a second apex area that is adapted to sealingly engage an inner surface of the neck portion; wherein the first annular seal is adapted to exert inward radial pressure on the outer surface of the neck portion and the second annular seal is adapted to exert outward radial pressure on the inner surface of the neck portion when the closure is installed on the container.