Device for electrically driving a cable-actuated window regulator

A window assembly comprising:

• a window;
• a cable actuated window regulator to cause movement of the window;
• and
• an electrical drive device for the window regulator including a casing including a cylindrical housing symmetrical about an axis and a cylindrical sleeve symmetrical about the axis and an opening at an end opposite the housing and constituting a brake box symmetrical about the axis, an electric motor mounted on the casing, a cable winding drum received in the housing and mounted to rotate about the axis in the casing and presenting on a face at least a first axial finger, a gear wheel mounted to rotate about the axis on the casing and driven in rotation by the motor and including at least a second axial finger and a toothed ring surrounding the sleeve and having a frontal wall obturating the opening of the sleeve, the at least a second finger extending axially from the frontal wall inside the ring, and a helical spring symmetrical about the axis and disposed in the brake box and including a pair of inwardly curved ends, the at least a first finger and the at least a second finger being disposed in the brake box and equidistant from the axis and extending circumferentially with a clearance inside the spring, the pair of ends of the spring and the fingers being disposed such that when the motor drives the wheel the at least a second finger abuts on one of the pair of ends of the spring to compress the spring axially so that the spring rotates at the same time as the gear wheel and, when the drum is rotated the at least a first finger abuts on one of the pair of ends of the spring and provokes axial extension of the spring which prevents rotation of the wheel further by contact of the spring with the brake box.