Patent ID: 8240007

Claim:
A hinge assembly for connecting a cover and a main body of a foldable electronic device, comprising: a shaft; a cam fixed with the shaft, one end of the cam having a substantially cylindrical first outer cam portion and a separate, substantially cylindrical first inner cam portion circumferentially surrounded by the first outer cam portion; a follower mounted with the shaft and adjacent to the cam, one end of the follower having a substantially cylindrical second outer cam portion and a separate, substantially cylindrical second inner cam portion circumferentially surrounded by the second outer cam portion, the second outer and inner cam portions respectively engaging with the first outer and inner cam portions; and a resilient member; and a cover drive member, the follower and the resilient member being received in the cover drive member; wherein the resilient member is compressed between the cover drive member and the follower to provide elastic force to make the cam portions of the follower resist the cam portions of the cam, and when the follower is manually rotated relative to the cam about a small original angle, the follower is automatically rotated relative to the cam due to the decompression of the resilient member.