Patent ID: 7299524

Claim:
A hinge assembly for joining a cover to a main body of a foldable electronic device, comprising: a hollow housing comprising an open first end, and a hole in an opposite second end, a peripheral wall of the housing defining a pair of opposite pinholes at the first end; a fixed member comprising a securing portion extending out of the housing through the hole, and a hole extending therethrough, the securing portion being a generally cylindrical body but with at least one planar face for fixing the fixed member in the main body, and the at least one planar face defining a pinhole extending therethrough; a shaft securely connected with the fixed member, wherein the shaft is a generally cylindrical body with two opposite arcuate sides and two opposite planar sides, and the shaft defines a through hole at one end thereof, the through hole extending through the planar sides; an elastic element received in the housing and located around the shaft, one end of the elastic element abutting the fixed member; a cam received in the housing, the cam defining a cam hole extending therethrough and comprising a cam portion, one end of the cam portion having a cam surface, the cam hole engagingly receiving the shaft, an opposite end of the elastic element biasing the cam; and a follower essentially in the shape of a cylinder and retained in the pinholes of the housing, the follower being rotatable relative to the shaft and movably engaged with the cam surface.