Patent ID: 8578561

Claim:
A dual-axis hinge comprising: a connecting bracket having a gear room formed therein; an upper pintle assembly connected to the connecting bracket and comprising an upper pintle mounted rotatably through the gear room of the connecting bracket; an upper rotating bracket mounted securely around one end of the upper pintle; and an upper active gear mounted securely around the upper pintle and mounted in the gear room of the connecting bracket; a lower pintle assembly connected to the connecting bracket and comprising a lower pintle mounted rotatably through the gear room of the connecting bracket; a lower rotating bracket mounted securely around one end of the lower pintle; and a lower active gear mounted securely around the lower pintle and mounted in the gear room of the connecting bracket; and a transmission gear assembly mounted in the gear room of the connecting bracket and connected between the upper and lower active gears to adjust a velocity ratio of the upper and lower active gears, wherein an included angle between the upper rotating bracket and the connecting bracket is D 1 an included angle between the lower rotating bracket and the connecting bracket is D 2 , D 1 is not equal to D 2 , the velocity ratio of the upper and lower active gears is X, the ratio of the included angles is R, i.e. D 2 ÷D 1 =R, and X approximates to or is equal to R.