Patent ID: 7251859

Claim:
A hinge device comprising: a first hinge member; a second hinge member arranged opposite to the first hinge member; a hinge pin turnably connected to the first hinge member and non-turnably connected to the second hinge member; and a turn biasing mechanism configured to turn bias the first hinge member in a first direction with respect to the second hinge member when the first hinge member is in a predetermined biasing angle range with respect to the second hinge member, wherein the turn biasing mechanism comprises: a movable member disposed between the first hinge member and the second hinge member, wherein the movable member is non-turnably connected to the first hinge member and movable in an axial direction of the hinge pin; and a biasing member configured to bias the movable member in the axial direction of the hinge pin such that the movable member is abutted with the second hinge member, wherein: a first abutment surface of one of the movable member and the second hinge member comprises a convex part; and a second abutment surface of the other of the movable member and the second hinge member comprises a cam face, wherein when the first hinge member is in the biasing angle range, the cam face is abutted with the convex part such that a biasing force of the biasing member is converted to a turn biasing force in the first direction, wherein a fitting hole is formed in the first hinge member, and the hinge pin is turnably press-fitted in the fitting hole such that a frictional resistance of a predetermined force between an inner peripheral surface of the fitting hole and an outer peripheral surface of the hinge pin prevents relative rotation between the first hinge member and the hinge pin, at least when the first hinge member is outside the biasing angle range.