MECHANICAL SYSTEM FOR CONTROLLING THE SPEED OF ELECTRIC LIFTS

摘要

The system of the invention is based on a mechanism comprised of a mechanical brake of the charge actuating as a brake in both rotation directions and automatically, thereby being independent of the magnitude and direction of the resulting torque of cabin-counterweight (charge torque). The mechanism comprises a toothed motor plate (5) which is set in motion by a gear (4) integral with the input shaft (3); said driving plate (5) is mounted by means of a variable trapezoidal threading to the threaded shaft (6) or output shaft on which the charge torque actuates. On said shaft (6) are mounted collaterally to the drive plate (5) two other charge plates (8); two brake discs (10) assisted by a unidirectional mechanism are arranged between the two charge plates (8). As a function of the direction of the charge torque adopted by the output shaft (6), the active brake will be either the left side or the right side, the other remaining inactive.