| 摘要 |
A movable member is arranged on a turning axial line of first and second hinge members such that the movable member is turnable and movable in the direction of the turning axial line. A confronting surface of the first hinge member with respect to the movable member is provided with an end face cam extending in a peripheral direction about the turning axial line. An abutment arm part of the movable member is press-contacted against the end face cam by a biasing force of a coiled spring. Thereby, the biasing force of the coiled spring is converted to a turn biasing force for turning the movable member. The second hinge member is turned via the movable member by the turn biasing force. A terminal end part of the end face cam is provided with a gentle inclination surface. An inclination angle of the gentle inclination surface is smaller than an inclination angle of a main inclination surface of the end face cam, the main inclination surface being located closer to a starting end of the end face cam than the gentle inclination surface, the main inclination surface covering a large part of the end face cam.
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