| 摘要 |
A transmission device includes a spindle and a shaft rotatably supported in a housing, a coupling device for selectively coupling the spindle to the shaft and to rotate the shaft in a same direction as that of the spindle. Another coupling device may selectively couple the spindle to the shaft and to rotate the shaft in a reverse direction as that of the spindle, and includes a driving pinion attached to the spindle, a driven gear is freely and rotatably attached on the shaft and coupled to the driving pinion, and a latching gear movable to selectively engage with the driven gear, to allow the shaft to rotated by the spindle to rotate in a same direction as that of the spindle by the driven gear and the driving pinion.
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