Lipstick case with means for push-back prevention

Abstract

A cosmetic container for a cosmetic, such as lipstick, which permits the cosmetic to be extended and retracted for application and which permits a low swivel torque, which operates smoothly, and which substantially minimizes or prevents 'push-back'. The container includes a uniquely configured lug which cooperates with a helical channel of a tubular sleeve to prevent push-back which is defined as unwanted movement of the lipstick within the container caused by downward axial force which results when the lipstick is applied. According to one embodiment, the lug includes an end surface portion having a compound surface wherein one portion thereof is parallel to the longitudinal axis and another portion thereof is positioned at an acute angle to the longitudinal axis. The compound surface also includes a line of intersection defining the portions which is, itself, angularly positioned relative to a plane normal to the longitudinal axis. The compound surface abuts either an inner surface the tubular sleeve or a sidewall of the helical channel when downward axial pressure is applied to the lipstick and the carrier supporting the lipstick. According to an alternative embodiment, the lug end surface portion includes a convex protrusion and the helical channel includes a correspondingly configured concave portion to receive the convex protrusion.