| 摘要 |
A locking part (28) has a locking surface with a shape corresponding to that of one of the depressions (17) in the periphery of the rotary device (16), so that the locking part can be inserted into a depression in order to fix the device in a given rotary position. A fastener part (30) is used to fix the locking part in a stationary position. The locking surface is also shaped so that it can locate a peak (17) in between two adjacent depressions on the rotary device and fix the device in another given rotary position. |
