Patent ID: 7345872

Claim:
A handheld electronic device, comprising: a first casing having a first pivot portion; a second casing having a second pivot portion, wherein the first and the second pivot portions each has a plurality of teeth thereon, the teeth meshing with each other; and a hinge structure to which the first pivot portion of the first casing and the second pivot portion of the second casing are pivotably connected, the first casing being free to rotate 360° relative to the second casing, and a path of the first casing during its rotation relative to the second casing being predetermined, wherein the hinge structure comprises: a first axle cap; two axle rods each having an end secured to the first axle cap, the axle rods extending in the first pivot portion of the first casing and the second pivot portion of the second casing, respectively; and a second axle cap connected to ends of the two axle rods distant from the first axle cap.