| 摘要 |
The blind according to the claim of the main patent is characterised in that the ends 21 and 22 of the helical spring 20 are fixed respectively to a component 33 connected to the output shaft of a geared motor 30 placed coaxially in the drum 2 and a component 37 inside the said drum 2 and fixed to it. According to a particular embodiment, the geared motor 30 is engaged in a sleeve 31 and has a driving pinion 33 connected kinematically to the said sleeve 31, which carries a pulley 13 for a tie 6 for pulling the sheet 1 and is wedged in the drum 2 via ball bearings 35 and 36. <IMAGE>
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