| 摘要 |
A hinge mechanism comprising a fixed cheek plate, a moving cheek plate provided with a circular set of teeth, two toothed slugs disposed at 120° relative to each other, which slugs are slidable relative to the fixed cheek plate and are adapted to co-operate with the circular set of teeth in order to lock the moving cheek plate, a cam for controlling radial displacement of the slugs, and two abutments belonging to the fixed cheek plate, each plate facing the rear end of a corresponding one of the slugs and serving as a bearing surface for the cam. |
