Patent ID: 8186778

Claim:
A portable electronic device comprising: a body; a bottom panel configured for supporting the body; two first openings and a second opening defined in the bottom panel; the two first openings and the second opening forming three corners of an isosceles triangle correspondingly; two opposite supporting portions being formed on the bottom panel at one side of each opening and being symmetrical to each other relative to each opening; two opposite fixing portions being formed on the bottom panel between the two supporting portions; at least two screw holders formed on the bottom panel at the other side of each opening; at least two linear wheel assemblies assembled to the bottom panel in the body corresponding to the two first openings; a directional wheel assembly assembled to the bottom panel in the body corresponding to the second opening; each linear wheel assembly and the directional wheel assembly comprise a wheel member and a driving member respectively; and a control button electrically connected to the driving members for controlling the driving members to drive the wheel members; wherein the driving member of each linear wheel assembly drives the wheel member of the corresponding linear wheel assembly to extend through the corresponding first opening and retract in the body, the driving member of the directional wheel assembly drives the wheel member of the directional wheel assembly to extend through the second opening and retract in the body and to rotate, and the wheel members of the linear wheel assemblies and the wheel member of the directional wheel assembly are driven to extend out of the bottom panel simultaneously and driven to retract in the body simultaneously.