Abstract: A package having child-resistant and non-child-resistant modes of operation includes a container having a neck finish with an open end, an external surface surrounding the open end and at least one external first engagement element spaced from the open end. A closure has a base portion, a skirt extending from the base portion, and at least one internal second engagement element on the skirt for engagement with the external first engagement element on the container neck finish in a child-resistant mode of operation. The skirt containing the second engagement element is severable from the base portion of the closure to convert the closure from a child-resistant mode of operation to a non-child-resistant mode of operation. A first annular element within the skirt is disposed for engagement with the external surface on the container neck finish to seal the package in the child-resistant mode of operation.

Abstract: A closure includes a skirt and internal lugs on the skirt. The skirt has an undulating circumferential contour that includes alternate outwardly convex and outwardly concave portions, with the internal lugs being disposed within the outwardly concave portions of the skirt. The skirt preferably is sufficiently flexible to allow the outwardly concave portions of the skirt to assume an outwardly convex geometry as a result of outward pressure on the internal lugs during demolding of the closure. The closure thus may be simply axially stripped from the mold core during the demolding operation without requiring movement of portions of the mold core to clear a path for travel of the lugs. The lugs preferably are shaped as an inverted U that opens toward a free edge of the skirt, further to facilitate demolding of the closure.

Abstract: A child-resistant package includes a container having an open mouth, a conical external surface around the open mouth that widens away from the mouth and a wall extending from the conical external surface. A closure has a base wall, and a peripheral skirt having a first portion adjacent to the base wall and a second portion removably connected to the first portion. An annular first wall extends from the base wall at a position radially inward from the skirt for spring/sealing engagement with the conical external surface of the container. A second wall extends from the base wall at a position radially inward from the first wall and, preferably, at an outward conical angle to the base wall. The second portion of the skirt and the wall on the container have interlocking elements that resist removal of the closure from the container in a child-resistant mode of operation absent a force against the first wall to disengage the interlocking elements.