Patent ID: 7299523

Claim:
A hinge mechanism for pivotably joining a cover to a main housing of a foldable radiotelephone, comprising: a rotation assembly comprising a hollow connecting member, two shafts adapted to pivotably connect opposite ends of the connecting member with the cover and the main housing, and an elastic member received in the connecting member, opposite ends of the elastic member being engaged with the shafts respectively; and a connecting assembly adapted to pivotably join the cover and the main housing of the foldable radiotelephone, the connecting assembly comprising a first spindle and two second spindles, the first spindle and the second spindles provided on corresponding ends of the main housing and the cover respectively; wherein at least one of the shafts is slidable along a longitudinal axis of the connecting member; and when the cover is opened relative to the main housing, the at least one shaft slides along the longitudinal axis in a first direction and stretches the elastic member; and when the cover reaches a predetermined angle relative to the main housing, the elastic member rebounds and drives the at least one shaft to slide along the longitudinal axis in a second direction opposite to the first direction, whereby the cover is automatically further opened relative to the main housing.