Patent ID: 8854811

Claim:
An electronic device, comprising: a housing having a housing plate with an opening, wherein a portion of an edge of the housing plate encompassing the opening extends inwardly to the opening to form a support plate and the support plate is formed with at least one breach; a cover plate separably disposed on the housing plate and correspondingly covering the opening, wherein the cover plate is supported by the support plate and has a groove formed on an edge of the cover plate, the groove has a groove bottom surface recessed from and parallel to a surface of the cover plate; and a button disposed at a different side on the edge of the opening with respect to the groove and rotating on the housing plate between a release position and a lock position, the button comprising a pivot, a first plate and a second plate, the pivot connecting the first plate and the second plate, wherein when the button rotates to the lock position, a portion of the button extends into the groove covering and at least a portion of the groove bottom surface is clamped between the first plate and the second plate such that the button relatively positions the cover plate and the housing plate.