Patent ID: 7383617

Claim:
A hinge assembly for joining a cover to a main body of a foldable electronic device, the hinge assembly comprising: a hollow housing comprising an open end, and a hole in an opposite second end, a peripheral wall of the housing defining a pair of opposite pinholes adjacent to the open end; a shaft comprising a fixing portion extending out of the housing through the hole, and a stopper portion adjacent to the fixing portion; an urging mechanism received in the housing and located around the shaft, one end of the urging mechanism abutting the stopper portion of the shaft; 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 urging mechanism biasing the cam; and a follower essentially in the shape of a cylinder and fixed in the pinholes of the housing, the follower being rotatable relative to the shaft and movably engaged with the cam surface.