Roll-on applicator with sharp sealing ring

Abstract

A roll-on type applicator assembly including a ball-type plastic fitment secured to the collar of a liquid dispensing container, and a closure therefor. The fitment includes an integrally formed sealing ring which constitutes a sharp rim formed at the intersection of a pair of angled annular faces. The applicator ball is supported in the fitment by means of an annular array of spring plates which bias the applicator ball upwardly of and out of contact with the sealing ring when the cap is removed from the container. The cap is formed on the underside of the inner surface of its domed top wall with a plurality of flexible fingers oriented symmetrically with respect to a vertical axis of the container, the fingers extending downwardly to engage the upper surface of the ball and to urge the ball resiliently into contact against the relatively inflexible sealing ring when the cap is tightened in place on the container, thereby to establish a fluid-tight sealing engagement between the sealing ring and the ball to prevent escape of fluid from the container during periods of non-use.