| 摘要 |
The invention concerns a device with a mobile part comprising two crowns (1 and 13) rigidly coupled with rods passing through the hub (7) outside the bearings (6). The springs (20) press that frame against the fixed ring (10) such that the pins (21) are engaged in the holes (22). The lever (15) is provided with cam-branches (18) supported by the ring (23). When the lever (15) pivots about the spindles (19) the wheel is blocked or released. |
