Child safety closure

A safety closure and container, said container having an upstanding side wall with an open mouth over which said closure is received in moisture tight sealing engagement with said container, said closure having a top wall adapted to extend across the open mouth of said container and having a depending skirt wall attached to and encircling said top wall, said container having a plurality of locking members thereon defining areas of non-uniform cross-sectional thickness in the upper portion of said container, a plurality of locking members formed on the inner surface of said depending skirt wall for cooperation with said locking members on said container to releasably retain said closure on said container, said locking members defining locking lug and locking recess interconnection between said container and closure, biasing means within said encircling skirt wall and engaging said container and being compressed and flexed to bias said locking members on said closure into locking relationship with said locking members on said container until said closure is forced downwardly and rotated relative to said container to release said closure, a tapered lead-in surface on the interior of said container side wall, a cylindrical wall beneath said tapered lead-in wall, said closure having an annular depending wall encircled by said skirt wall and received within said open mouth of the container to project downwardly therein a predetermined distance, and a circumferential radially outward sealing surface located on and adjacent the lower end of said annular depending wall for sliding engagement with said tapered lead-in wall to move downwardly for sealing engagement with the interior to engage said cylindrical wall of said container at a location axially spaced from said non-uniform cross-sectional thickness areas defined by said container locking members and any out-of-roundness due to said increased thickness at said container locking members.

A safety closure and container, said container being made of polypropylene and having an open mouth over which said closure is received in moisture tight sealing engagement with said container, said container having a tapered lead-in surface internally adjacent said open mouth, said closure having a top wall adapted to extend across the open mouth of said container and having a depending skirt wall attached to and encircling said top wall, said container having a plurality of locking members thereon defining areas of non-uniform cross-sectional thickness in the upper portion of said container, a plurality of locking members formed on the inner surface of said depending skirt wall for mutual cooperation with said locking members on said container to releasably retain said closure on said container, said locking members defining locking lug and locking recess interconnection between said container and closure, said closure including a flexible fitment made of polyethylene and releasably and loosely retained within said encircling skirt wall, said fitment engaging said container and biasing said locking members on said closure into locking relationship with said locking members on said container until said closure is forced downwardly and rotated relative to said container to release said closure, said fitment having an annular depending wall encircled by said skirt wall and received within said open mouth of the container to project downwardly therein a predetermined distance, and a circumferential radially outward sealing surface located on and adjacent the lower end of said annular depending wall for sealing engagement with the interior surface of said container at a location spaced axially of said locking members on said container and spaced axially from said non-uniform cross-sectional areas defined by said container locking members so as to be located below any out-of-roundness in the container surface defining said open mouth thereof, said sealing surface engaging said lead-in surface and guiding said loosely retained fitment to a centered position in said container open mouth.

A safety closure for use with a container having an open mouth defined by an annular neck wall having an annular end surface, and a plurality of retaining notches formed on its outer surface adjacent said end surface, said safety closure comprising a closure cap having a roof and an annular depending skirt, said skirt having a plurality of locking lugs internally thereon cooperable with said retaining notches to releasably retain said cap on the closure, a fitment retained within said cap and adapted to effect a moisture tight sealing relation with the container when said cap is mounted thereon, said fitment having a generally planar crown and an annular flange disposed circumferentially of said crown and interconnected thereto so that said crown lies in a plane spaced from the plane of said annular flange, an annular wall secured to said flange and depending from the side thereof opposite said crown, said depending wall being adapted to extend axially within the mouth of the container and having a circumferential radially outward sealing bead adapted for engagement with the interior surface of said annular neck wall when said closure is mounted on said container, said sealing bead being located axially below said locking lugs, said fitment being of a configuration such that said annular flange engages said annular end surface of said container and causes said crown to be compressed against said roof of said closure cap when said cap is mounted on the container, said compression of said crown serving to bias said locking lugs into locking relation within said retaining notches and bias said sealing bead against said inner surface of the annular neck wall in sealing contact therewith.