Patent ID: 8756762

Claim:
A hinge assembly comprising: a first frame, having an elongated portion, first and second ends perpendicular to the elongated portion, at least one first pin protruding from the first end, and at least one second pin protruding from the second end; a second frame, having an elongated portion, first and second ends perpendicular to the elongated portion with respective first and second curved slots, wherein the at least one first pin protrudes through the first curved slot and the at least one second pin protrudes through the second curved slot; wherein the second frame is rotatably coupled to the first frame by the at least one first pin, the at least one second pin, and the first and second curved slots, wherein the second frame is slidably adjustable between a first rotation position and a second rotation position to change a tilt angle of the second frame with respect to the first frame; the hinge assembly further comprising: a first elastic member connected between the first frame and the second frame that presses the second frame toward the second rotation position; and an elongated locking member, movably coupled to the first frame to slide along the elongated portions of the first and second frames between a locking position, where the elongated locking member is engaged with the second frame to maintain the second frame at the first position, and an unlocking position, where the elongated locking member is separated from the second frame; wherein: the first end of the second frame comprises a catch step; a first end of the elongated locking member comprises a hook portion that protrudes toward the second frame, wherein the hook portion engages the catch step when the second frame is in the first position and the elongated locking member is in the locking position; the hook portion comprises a first inclined portion; the catch step comprises a second inclined portion that engages the first inclined portion when the second frame is moved from the second position to the first position to slide the elongated locking member in a direction toward the unlocking position.