Patent ID: 7401382

Claim:
A hinge assembly, comprising: a shaft comprising a securing portion formed at one end thereof, the shaft further having a slot formed therethrough, the slot being oriented along an axis of the shaft; a rotary cam substantially in the shape of a cylinder, the rotary cam comprising a cam surface, the rotary cam further having a cam hole extending therethrough, the cam hole receiving the shaft therein; a follower cam comprising a cylindrical portion and two symmetrically protruding portions, the protruding portions each extending axially from the cylindrical portion, the cylindrical portion having at least one pinhole formed therein; a positioning member received in the pinhole and the slot, the positioning member being configured for securely connecting the follower cam with the shaft, the positioning member being slidable in the slot of the shaft along directions of the axis of the shaft; and an urging means having a first end and an opposite second end, the first end of the urging means abutting the shaft, the opposite second end of the urging means biasing the rotary cam, the cam surface of the rotary cam being rotatably and movably engaged with the protruding portions of the follower cam under a force of the urging means.