Child resistant closure

A child resistant closure for a container having a threaded neck thereon, comprises a cap having an internally threaded cylindrical skirt with an annular end surface and a disc-shaped end wall for sealing engagement on the end of the threaded neck, a yieldable collar on the neck of the container in a position to be engaged by the end surface of the cap skirt, the container comprising a metallic material and the collar including an integral radially outwardly and then inwardly formed portion of the neck, and complementary projection and recess means on the skirt end surface and collar in a position to be cooperatively interengaged when the cap is threaded fully onto the neck of the container, said collar being yieldable by manual pressure thereon to release the interengaged projection and recess means to enable retrograde movement of the cap from the neck and having a substantially constant diameter and uniform shape, said collar projecting radially beyond the cap skirt only sufficiently far enough to enable manual engagement and downward flexing thereof by an adult.

A child resistant closure for a container having a threaded neck thereon, comprises a cap having an internally threaded cylindrical skirt with an annular end surface and a disc-shaped end wall for sealing engagement on the end of the threaded neck, a yieldable collar on the neck of the container in a position to be engaged by the end surface of the cap skirt, the container being made of non-flexible material and having an opening and an adaptor which is secured in the container opening, said adaptor having a threaded neck for cooperation with the cap and having the collar integral therewith, said collar being permanently secured to the container, and complementary projection and recess means on the skirt end surface and collar in a position to be cooperatively interengaged when the cap is threaded fully onto the neck of the container, said collar being yieldable by manual pressure thereon to release the interengaged projection and recess means to enable retrograde movement of the cap from the neck and having a substantially constant diameter and uniform shape, said collar projecting radially beyond the cap skirt only sufficiently far enough to enable manual engagement and downward flexing thereof by an adult.

A child resistant closure for a container having a threaded neck thereon, comprises a cap having an end wall and a depending cylindrical side wall with internal threads therein, an adaptor having one end portion constructed to be secured and sealed in the threaded neck of the container and another end portion having external threads thereon for cooperation with the threaded cap, a flexible collar on said adaptor between the ends thereof in a position to be engaged by the cap side wall, and interfitting projection and recess means on the cap side wall and collar for latching the cap in closed position threaded fully onto the adaptor, said collar being yieldable to release the projection and recess means to enable retrograde movement of the cap from the container.