Patent ID: 7203532

Claim:
An electronic device, comprising: a first housing having a channel, the channel comprising a chamber and a sliding slot; a hinge mechanism disposed within the first housing, comprising: a shaft having a first end and a second end; a cam movably disposed on the shaft, the cam being slidable along the longitudinal axis of the shaft, and the cam being rotatable around the shaft when the cam being decoupled with the first end; a spring having a fixing end and a stopping end, the fixing end being restricted by the second end; and a sliding member disposed between the spring and the cam, the slidable member being slidable along the longitudinal axis of the shaft; and a second housing comprising a protruding member, the protruding member being slidably received within the channel for being selectively disposed within the chamber of the channel to engage with the cam within the first housing and for being selectively disposed within the sliding slot to release the cam; wherein when the protruding member is disposed in the sliding slot, the spring pushes the sliding member toward the first end to make the cam coupled with the first end and preventing the cam to rotate around the shaft; wherein when the protruding member is disposed in the chamber and engaging with the cam, the protruding member pushes the cam toward the second end so that the cam is decoupled with the first end and rotatable around the shaft.