Patent ID: 7859858

Claim:
An apparatus, comprising: a top case having a top surface and a side surface; and, a bottom case having a bottom surface and a side surface; wherein the top case comprises a flange protruding from the side surface, the flange having a base portion and at least one extended surface; wherein the bottom case comprises a vertical post on the side surface and an aperture having portions extending from the bottom surface to the side surface, wherein a first portion of the aperture extending along the bottom surface of the bottom case has sufficient width to selectively allow the entire flange to pass therethrough with the top and bottom cases disposed in a first relative orientation, wherein, with the top and bottom cases disposed in a second relative orientation, the base portion of the flange passes through a second portion of the aperture on the side surface of the bottom case, the vertical post retains the at least one extended surface of the flange, and the extended surface of the flange covers the first portion of the aperture on the bottom surface of the bottom case.