| 摘要 |
PROBLEM TO BE SOLVED: To obtain reliability from the viewpoint of the number of times of opening and closing operations and smooth movement with little resistance by constituting a mechanism by a hinge shaft having a cam surface and an elastic means adjusted so as to cooperate with the cam surface and loading an elastic device according to different directions of the cam surface due to relative rotation. SOLUTION: In a hinge mechanism, each of an elastic means and a cam surface rotates so as to change torque between the elastic means and the cam surface. When a first housing and a second housing are located at open locations, the first housing and the second housing are biased each other to open direction locations, and when the first and second housings are located at close locations, the first housing and the second housing are biased each other to close direction locations. Thus detent torque is generated in the housings at open locations and close locations. A plane opposed to the can surface is oblique to a vertical shaft of a hinge shaft 42 and thereby detent torque is generated. The hinge shaft 42 is provided with a projection part 70, the projection part 70 is joined to a corresponding projection part of the second housing, and thereby a joint point of the projection part supports the first housing and the second housing at open locations. |
