Patent ID: 7203995

Claim:
A rotary type hinge assembly for joining a body and a cover of a foldable electronic device, the hinge assembly defining a first axis and a second axis perpendicular to the first axis, the hinge assembly enabling the cover to open with respect to the body about the first axis and rotate about the second axis, and the hinge assembly comprising: a housing rotatably attached to the body of the foldable electronic device, and defining a container therein; a first elastic means received in the container of the housing; a first driven element, a first end thereof supporting the first elastic means, and a second end thereof having a cam surface; a first cam being coaxial with the first driven element, and having a cam surface defined on an end thereof, the cam surface comprising a mountain-shaped portion having a flat surface engaging with the cam surface of the first driven element; a rotary shaft including a head portion at an end thereof; and a fixing means comprising an anti-pressure board for fixing the head portion of the rotary shaft in the cover; wherein the rotary shaft extends through the first cam, the first driven element and the first elastic means in that order, and is rotatably attached to the housing, the anti-pressure board is curved and comprises a curved portion and two wing portions, the curved portion and the wing portions define a U-shaped trough receiving the head portion of the rotary shaft, and a pair of through holes is defined in the wing portions.