Patent ID: 7644473

Claim:
A foldable hinge comprising: a base seat being fixed on a plane, having two lateral plates each having a seat with a pivot hole forming a pivotally connecting area; a connecting seat for fixing a plane screen, having two rearward extending plates each having a seat with a pivot hole forming another pivotally connecting area; two pivot connecting units used for pivotally connecting said base seat with said connecting seat; an adjusting unit is composed of a cam provided between said seat with a pivot hole of said base seat and said seat with a pivot hole of said connecting seat as well as a positioning member provided at an inner end of said pivot connecting unit having said adjusting unit; said cam is provided with a first slot and a second slot; said positioning member has a protruding bar with a bevel portion on its one end, and is adapted to extend through said seat with a pivot hole of said base seat; said positioning member has a protruding bar with a bevel portion on its one end, and is adapted to extend through said seat with a pivot hole of said base seat, said seat with a pivot hole of said connecting seat, and said first and second slots of said cam; the adjusting unit provided in one of said two pivot connecting units, hence when said base seat and said connecting seat are unfolded away from each other, said connecting seat is rotated to adjust its depression angle or elevation angle relative to said base seat, said adjusting unit is adapted to folding said base seat and said connecting seat together, and said adjusting unit is adapted to directly unfolding said connecting seat away from said base seat to form an unfolding state; and a press unit provided in said pivot connecting unit having said adjusting unit, said press unit is changed from said unfolding state into a folding state; when said protruding bar is in said first slot of said cam, said base seat and said connecting seat are in said unfolding state, and said connecting seat is adapted to adjusting its depression angle or elevation angle relative to said base seat; when said protruding bar is in said second slot of said cam, said base seat and said connecting seat are in said folding state.