Patent ID: 7587789

Claim:
A hinge comprising: a central bracket having a main arm having a first end; and a second end; a first arm formed perpendicularly on the first end of the main arm; and a second arm formed perpendicularly on the second end of the main arm; a first tilt hinge assembly connecting to the first arm of the central bracket and comprising a tilt shaft connecting rotatably to the first arm and having an inner end; a positioning head formed radially on the inner end of the tilt shaft; and a positioning protrusion formed axially on an inner surface of the positioning head; and a first rotating bracket mounted securely on the tilt shaft; a second tilt hinge assembly connecting to the second arm of the central bracket and comprising a barrel connecting securely to the second arm of the central bracket; and a second rotating bracket mounted rotatably on the barrel; and a rotating hinge assembly connecting to the main arm of the central bracket and comprising a central shaft connecting rotatably to the main arm of the central bracket and having an inner end; and a limiting head formed radially on the inner end of the central shaft, corresponding to the positioning head of the tilt shaft and having two limiting sides being opposite to each other; two flat sides being opposite to each other and formed between two limiting sides, wherein the limiting sides and the flat sides alternatively align with the positioning head of the tilt shaft; and an annular slot formed radially in the limiting head of the central shaft and corresponding to and selectively engaging the positioning protrusion of the positioning head of the tilt shaft; a stationary limiting spacer mounted around the central shaft and having a thickness, a limiting protrusion formed on the stationary limiting spacer; a rotating limiting spacer mounted securely on the central shaft and having a thickness thicker than the thickness of the stationary limiting spacer; a first limiting protrusion formed on the rotating limiting spacer and corresponding to and selectively abutting the limiting protrusion on the stationary positioning spacer; and a second limiting protrusion formed axially on the rotating limiting spacer and being opposite to the first limiting protrusion; a fastening bracket mounted securely on the central shaft and having at least one limiting protrusion formed on the fastening bracket and corresponding to and selectively abutting the second limiting protrusion of the rotating limiting spacer.