Patent ID: 8420197

Claim:
An injection molded part formed from at least two materials comprising: (a) a first injection molded material that forms a concave, bowl-shaped first portion of the molded part, the first portion including a base located at the bottom of the first portion and a side wall that extends generally upwardly and outwardly from the base the side wall having an inner surface and an outer surface, the inner surface and base generally defining an inner recess of the concave, bowl-shaped first portion, a portion of the inner surface forms an interfacial surface, at least one interlock cavity formed adjacent to the interfacial surface within the side wall, the at least one interlock cavity extending between the inner surface and the outer surface, the at least one interlock cavity further having a first opening at the inner surface and a second opening at the outer surface, the first opening being smaller than the second opening; and (b) a second injection molded material disposed within at least a portion of the inner recess that forms a second portion of the molded part, the second injection material not being disposed against the outer surface of the side wall, the second injection molded material configured to be in contact with the interfacial surface and occupy the at least one interlock cavity, the at least one cavity configured to provide a mechanical interlock between the first portion and the second portion that prevents the first and second portions from being separated.