Patent ID: 8356728

Claim:
A shell assembly comprising: a rotatable to shell and a bottom shell, the rotatable to shell including: a body having a top surface defining a plane; a curved tongue defined on one end of the body, a concave surface of the curved tongue configured to rotate about an x-axis and simultaneously slide in a y-direction and a z-direction along a complimenting curved mating surface of the bottom shell to allow the rotatable top shell to rotate between an open position and a closed position, the concave surface of the curved tongue being oriented upward toward the plane defined by the top surface of the body and configured such that the x-axis translates in the y-direction and the z-direction as the rotatable top shell rotates; and means for securing the rotatable top shell relative to the bottom shell when the rotatable top shell is in the closed position, wherein the tongue and the means for securing the rotatable top shell relative to the bottom shell when the rotatable top shell is in the closed position are configured to substantially secure the body in an x-direction, the y-direction, and the z-direction to the bottom shell when the rotatable top shell is in the closed position.