| 摘要 |
Device suitable for transmitting a torque from a first shaft (5) to at least one second shaft (6), wherein the first shaft (5) is mechanically connected to a first cylindrical sleeve (12) which can be mechanically coupled or uncoupled with a second sleeve (13) mechanically connected to the second shaft (6) and arranged in a coaxial way around the first sleeve (12), by extracting or retracting, respectively, a mobile tooth (14) which can rotate in a seat made in the first sleeve (12), a third sleeve (18) being arranged in a coaxial and rotating manner around the first sleeve (12) and being provided with braking means (19; 25), wherein the mobile tooth (14) is provided with a cursor (21) suitable for sliding in a substantially radial manner in a groove (22) made in the third sleeve (18), so that the relative rotation of the third sleeve (18) with respect to the first sleeve (12) causes the extension or the retraction of the mobile tooth (14) according to the direction of this relative rotation. |
