Patent ID: 7552512

Claim:
A hinge assembly for joining a flip cover to a main body of a foldable electronic device, comprising: a shaft comprising a securing portion and a flange portion opposite to the securing portion; a follower integrally connecting with the shaft; a cam comprising a cam surface and defining a cam hole extending therethrough, the cam hole receiving the shaft therethrough; a friction-reducing mechanism located around the shaft, and including a rolling member; a retaining member configured to secure around the shaft and abut the flange portion; and an urging member, a first end of the urging member abutting against the retaining member, an opposite second end of the urging member biasing the friction-reducing mechanism, the friction-reducing mechanism being disposed between the cam and the urging member, and configured for reducing friction between the cam and the urging member, the cam surface of the cam being rotatably engaged with the follower under force of the urging member.