| 摘要 |
Transmission device (10) comprising a first rotary member (12) mounted coaxially on a second rotary member (11, 18). The first rotary member (12) c an rotate in one direction independently from the second rotary member (11, 18) , and in the opposite direction is constrained to the second rotary member (11 , 18) in order to rotate solidly therewith. The device (10) can assume a first and a second condition of use, wherein the first rotary member (12) rotates in the two directions independently from the second rotary member (11, 18), and a third condition of use wherein clamping means (30, 130), integrally associat ed with the first rotary member (12), move from a position of non-interference to a constraint position wherein they constrain the second rotary member (11, 1 8) in order to make the first rotary member (12) and the second rotary member (11, 18) rotationally solid.
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