the test valve for undue attempts to open containers, including aerosols.

摘要

A removable and replaceable cover for a container of the type having a cylindrical mounting cup with a peripheral undersurface defined by a peripheral outer edge located near the outlet end of the container. The cover is tamperproof until its first removal after which time it functions as a child resistant safety cover. The cover includes a top wall, a relatively thin flexible outer sleeve depending from the top wall and a relatively thin flexible inner sleeve which is generally coaxial with the outer sleeve and also depends from the top wall. Located at the lower end of the inner sleeve is an inwardly projecting locking flange which is adapted to extend under the peripheral undersurface of the container when the cover is installed on the container. The locking flange is trapezoidal in cross section with its shorter end extending inwardly of the peripheral outer edge of the container mounting so that at least a portion of the locking flange is removable by the peripheral outer edge of the undersurface when the cover is removed from the container the first time. A lifting pad is formed on the outer surface of the outer sleeve just above the lower edge of the sleeve. At least one web connects the inner and outer sleeves with the web located adjacent the lifting pad. Ribs are positioned on opposite sides the lifting pad and extend downwardly from the lifting surface thereof to the lower edge of the outer sleeve.