US Patent 7644473 Foldable hinge

A foldable hinge comprising: a base seat and a connecting seat able of being adjusted for an included angle between them; an adjusting unit is provided in a pivotally connecting area between the base seat and a pivot connecting unit; the adjusting unit includes a cam being provided with a first slot and a second slot, a positioning member having a protruding bar adapted to extending through the first and second slots, and a press unit able to release engaging of the protruding bar in the first and second slots. When the protruding bar is in the first slot, the connecting seat is adapted to adjusting its depression angle or elevation angle relative to the base seat; when the protruding bar is in the second slot, the base seat and the connecting seat are in a mutual parallel folding state, the protruding bar can be directly extended into the first slot without pressing the press unit.