| 摘要 |
In order to drive a shaft selectively in two opposite directions of rotation by means of a pivoting handle, use is made of a mechanism including an internally toothed ring which drives the shaft, a guide arranged diametrically inside the ring and mounted so that it can rotate, with friction, about the axis of pivoting of the handle, and a follower arranged with play inside the ring and driven by the handle with radial play and angular play. The follower exhibits two sets of toothing close to the ends of the guide for meshing with the internal toothing of the ring when the handle moves away from a neutral position, these sets of toothing being prevented from meshing with the internal toothing through interaction between reliefs of the follower and a slideway when the handle returns towards its neutral position.
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