| 摘要 |
<p>The key has a shaft (2) with a long cross-sectional axis and a short cross-sectional axis (7) orthogonal to the long cross-sectional axis. A set of closed grooves (5, 5 `) is arranged on the long cross sectional axis. The closed grooves are inclined to the long cross sectional axis of the shaft, and have different angles of inclination. The closed groove (5) has a positive angle of inclination (alpha1), and the groove (5`) has a negative angle of inclination (alpha2) to the short cross sectional axis.</p> |
