| 摘要 |
<p>Smoke extraction outlet or similar roof opening with a large displacement of the closing panel, comprising a supporting box (2) for a fixed frame (4), on which is articulated about hinges (8) provided on one of its edges a panel (5) capable of being laid sealingly onto the frame in the closing position, the panel (5) tilting about the hinges by means of a jack (9) in two parts (10, 11), one of which is articulated on the panel. According to the invention, the other part of the jack is articulated on the end of a pivoting link (14), itself articulated at its opposite end (15) on the box (2) and capable of occupying either one of two separate positions, namely for an opening of the panel corresponding to an angle slightly larger than 90 DEG , on the one hand, and then for an opening at an angle considerably larger, on the other hand, the panel being connected by means of a drawspring (21) to a rocker lever (16) articulated on the box and brought into a position bearing against a stop (19) of the latter for the first opening position, the spring being tensioned between the panel and the lever thus immobilised, until this panel reaches the second opening position. <IMAGE></p> |
