Domed container with interlocking resilient flanges

Claim 1

The combination of a container and a dome cover therefor having locking means for releasably locking the cover to the container, said container comprising a bottom surface delimited by an upstanding rib and terminating in an outwardly extending resilient rim wherein said rim is outwardly yieldable, said rim encompassing in spaced relation said rib and being provided with an inwardly extending shoulder, and a first camming surface formed on said rim and extending outwardly and upwardly from said shoulder; said dome cover comprising a top surface having at least one wall depending therefrom and terminating in an outwardly extending resilient flange adapted to underlie said shoulder in abutting locking engagement therewith preventing movement of said dome cover relative to said container, a second camming surface formed on the exterior of said flange, and an outwardly and downwardly extending skirt member formed inwardly from said flange and interconnecting said flange and depending wall, said skirt member including a laterally extending ledge section, said flange being in substantially encompassing outwardly spaced relation with said skirt member; when said cover is moved towards said container to effect locking engagement therewith, said first and second camming surfaces initially coacting with one another causing said rim to be deformed outwardly and said flange to be deformed inwardly towards said skirt member while the latter is substantially reinforced by a portion of said rib until said flange abuttingly engages the underside of said shoulder; when said cover and container are in interlocking engagement, the ledge section of said skirt member being disposed in substantially superposed spaced relation with portions of said rib and cooperating therewith to form a pocket opening towards the interior of the cover and spaced inwardly from the container rim.