Abstract: The version of the container of my U.S. Pat. No. 3,991,895, which provides a dual latching arrangement so that, by a first turning of the cover during the latching operation, a condition of easy opening for adults is obtained, and, if desired, a hard-to-open, child-resistant condition is obtained with a further turning of the cover, is improved by the provision of a positive stop at the end of the first turning of the cover to prevent inadvertent latching into child-resistant position and to require a positive, downward displacement of the cover before it can be turned into child-resistant condition.

Abstract: A cover for a specially constructed receptacle having a circular entryway, such as a pharmaceutical vial of plastic, satisfies the present day requirement for moisture-proofing containers of moisture-affected medicines by providing an elongate, resilient plastic skirt which extends deeply into the entryway through the open mouth of the receptacle. Mutually confronting, coacting, circular formations internally of the receptacle and intermediate the length of the skirt interengage in sealing, line contact when the cover is secured over the open mouth of the receptacle. One of the circular formations has a sharp edge, the other is a smooth surface against which the sharp edge impinges. Either formation may be carried by either the receptacle or the skirt. For long useful life, the sharp edge is preferably of softer material than the smooth surface, so as not to indent nor otherwise damage the smooth surface. Securement of cover to receptacle may be of child-resistant or of easy-opening type.