| 摘要 |
<p>Compact and autonomous device of high power for the opening of a smoke and heat vent, placed between the fix and the opening frame of the vent and composed of a fix arm forming the fix frame and a pivoting arm, the opening force being transmitted to the opening frame by means of a hinge fixed on a fitting piece gliding in the pivoting arm, which is retained in a closed position by means of a pivoting hook, driven by different pulling means, among which a pivoting lever kept in a retaining position by an electro-magnet, all forces and tensions being entirely taken up within the autonomous device and working in vertical and parallel planes, which are very close to one another. (Figure 1)</p> |
