| 摘要 |
<p>A spring structure (20) includes a clockwise spring (21) and a counterclockwise spring (22) that are coaxially arranged under a state in which a spring seat (23) is interposed between a lower end portion of the clockwise spring (21) and an upper end portion of the counterclockwise spring (22). An upper end portion of the clockwise spring (21) is supported on an upper spring seat portion (15), and a lower end portion of the counterclockwise spring (22) is supported on a lower spring seat portion (17). The start point of the effective winding positioned at a lower end of the clockwise spring (21) and The start point of the effective winding positioned at an upper end of the counterclockwise spring (22), or the end portion of the element wire positioned at the lower end of the clockwise spring (21) and the end portion of the element wire positioned at the upper end of the counterclockwise spring (22) are shifted from each other by 180±45 degrees in a circumferential direction around an axis of the clockwise spring (21) or the counterclockwise spring (22). The spring seat (23) includes an abutting plate portion (23a) and a tubular portion (23b), and is movable.</p> |
