| 摘要 |
1. Roller shutter for verandah roofs and the like comprising a blind (4) which is displaced practically horizontally and formed of slats (11, 12, 13) whose sides are provided with a gripping stud (I6, 17, 18) and, accomodated dated in a box (6), a shaft (14) for rolling up the blind (4), a second shaft (15) for unrolling the blind (4), drive means for alternately driving the rolling shaft (14) and the unrolling shaft (15) in rotation, these latter being alternately free-wheeling during reverse operations, the second shaft (15) for unrolling being arranged downstream with respect to the rolling shaft (14) and having at each end a driving sprocket wheel (19) co-operating with the gripping studs (16, 17, 18) of the slats (11, 12, 13) of the blind (4), characterised in that the driving means are a first motor which directly drives the rolling shaft (14) and a second motor having a brake connected by disengaging means to the unrolling shaft (15), the braked motor driving the unrolling shaft (15) having a power lower than the power of the rolling shaft (14). |
