| 摘要 |
<p>A spring structure (20) comprises a counterclockwise spring (21) and a clockwise spring (22) that are coaxially disposed in a state where a spring sheet (23) is disposed between the lower end of the counterclockwise spring (21) and the upper end of the clockwise spring (22). The upper end of the counterclockwise spring (21) is held on an upper spring support (15), and the lower end of the clockwise spring (22) is held on a lower spring support (17). The point on the lower end of the counterclockwise spring (21) at which the effective turns of the counterclockwise spring (21) start and end is positioned 180±45 degrees from the point on the upper end of the clockwise spring (22) at which the effective turns of the clockwise spring (22) start and end, about the axis of the counterclockwise spring (21) and the clockwise spring (22). The spring sheet (23) comprises a contact plate part (23a) and a cylindrical part (23b), and is also movably provided.</p> |
