overspeed detection mechanism in elevator apparatuses, safety device acting against overspeed and lifting apparatus.

摘要

overspeed detection mechanism in elevator apparatuses, safety device acting against overspeed and of lifting apparatus.; The sensing mechanism can be mounted on a pulley (50, 50 ') or on the elevator car (3). It incorporates a wheel (13) rotating according to the speed of the car (3) and has pivoting arms (20, 21) which swing by centrifugal force during rotation of the wheel (13). It has magnetic means associated to the pivoting arms (20, 21) causing an attraction maintaining the position of the pivoting arms (20, 21) until centrifugal force exceeds the attraction of the magnetic means. It incorporates a stop (30) belonging to an outer part (11-11 ') to the wheel (13) against which abuts the pivot arm (20, 21) when the centrifugal force generated on the pivoting arm (20, 21) due to overspeed of the car (3) of the lift exceeds the attractive force of the magnetic means starting the braking of the car (3).