| 摘要 |
The invention relates to improvements made to the up-and-over door according to the main patent. This up-and-over door 101 is characterised in that it comprises means 149, 152, 125 for the fine adjustment of the tension of springs 126, 127 mounted on the compensating shaft 107 and tensioned before the installation of the up-and-over door 101, said means for the fine adjustment of the tension cooperating with removable means 146 for relative blocking between the horizontal shaft 108 and the tubular section 117. The invention relates to the industry of building closures. <IMAGE>
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