Hinge assembly for a foldable electronic device

A foldable electronic device, comprising:

• a main body;
• a flip cover;
• and
• a hinge assembly configured for joining the flip cover to the main body, the hinge assembly including:
• 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, the securing portion engaging with the main body;
• a rotary cam substantially in the shape of a cylinder, the rotary cam comprising a cam surface and an engagement mechanism, the rotary cam having a cam hole extending therethrough, the cam hole receiving the shaft therein, the engagement mechanism being operatively connected with the flip cover;
• a follower cam comprising a cylindrical portion and two symmetrically protruding portions, each protruding portion extending from the cylindrical portion axially, the cylindrical portion having at least one pinhole defined therein;
• a positioning member received both in the pinhole and the slot, the positioning member thereby 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.