Opening and closing device

摘要

An opening and closing device is structured so that a first spring and a second spring having different outer diameters are provided. The first spring having a larger outer diameter surrounds the second spring having a smaller diameter, and these springs urge a rotor. This structure can provide an opening and closing device that has a large operating load even within limited dimensions and shapes of the springs and a proper feel of operating and closing operation, and is more positively held in operating and closing positions.