Patent ID: 8716598

Claim:
An apparatus adapted to house and protect an electronic device, the apparatus having a plurality of surfaces, comprising: a first member having a first planer section and a first perimetric wall formed thereon, the edge of the first perimetric wall forming a ridge, the first planer section and the first perimetric wall forming a plurality of the surfaces; a second member having a second planer section and a second perimetric wall formed thereon, the perimeter of the second planer section having a groove, the second planer section and the second perimetric wall forming a plurality of the surfaces; wherein the first perimetric wall and the second perimetric wall are separably engaged forming an overlap with an outer overlap layer extended from the first perimetric wall and an inner overlap layer extended from the second perimetric wall, the overlap having a first mating ring formed on the inner surface of the outer overlap layer and a second mating ring formed on the outer surface of the inner overlap layer mating with the first mating ring around the perimeter; wherein a dimensional interference is caused by a dimension of the second mating ring being greater than a corresponding dimension of the first mating ring; and wherein when the first member and the second member are engaged an interlock is formed by the ridge of the first perimetric wall biting into the groove at the perimeter of the second planer section to cause the outer overlap layer and the inner overlap layer of the overlap to compress each other.