| 摘要 |
<p>The invention relates to a gear mechanism for transmitting torques in both directions of rotation from a drive member (2) driven in rotation to an output member (12) arranged in the winding roller of a sun protection awning, the output member having a stop device that consists of a hollow spindle (12) fixedly connected to the output member (12), a travelling nut (3) co-operating with the hollow spindle and held non-rotatably thereon and stops (10, 11) for the travelling nut. According to the invention, the output member (12), like the hollow spindle, is of hollow construction and together with this forms a unit at the end remote from the drive member (2), the housing (2) of the drive member (2) is connected via a first disengageable clutch (27, 28) to a guide tube (6) that undertakes the non-rotatable retention of the travelling nut (3) in that it has a longitudinal groove (5) in which a guide piece (4) of the travelling nut (3) is guided, the drive member (2) is connected via a second disengageable clutch (43, 44) to a drive shaft (1) running freely in the output member (12) and the hollow spindle (12), and at its end remote from the drive member (2) the drive shaft (1) is coupled to the output member (12) via a friction clutch (26).</p> |
