| 摘要 |
<p>A device for moving and retaining shutters from the inside of the building, comprising a reduction unit with a worm screw gear system (20) actuated by an actuation shaft and stably engaged in a ring gear (7,10) located on the pivoting axis of the leaf-like part, comprising friction means (6,11) and elastic means (8,9) for transmitting the actuation motion from the gear system to the leaf-like part; the means, although using a nonreversible gear system and in order to prevent a sudden force affecting the leaf-like part in contrast with the reduction unit from damaging the reduction unit or the means for fixing the device to the leaf-like part, allow the connection of the gear system to the leaf-like part to be moved to occur due to the friction applied through the friction means (6,11) and elastic means (8,9), adequately compressed. <IMAGE></p> |
