| 摘要 |
<p>This invention concerns an accident prevention device for stopping motorised rolling shutters consisting of a gearmotor whose worm screw (1) engages simultaneously with two adjacent gear wheels (2,3), one (2) designed to drive the winding shaft and the other (3) to activate the stopping means of the shaft when the hold between the teeth of the first wheel (2) and the worm screw (1) accidentally fails.</p> |
