Electromechanical device for activating a rotating post that moves the leaf of a swinging door on a vehicle

In an electromechanical device for activating a rotating post that moves a leaf of a swinging door on a vehicle, having an electric motor with an outtake shaft that activates the post by an intermediate worm gear with an intake shaft, an outtake shaft and a worm wheel, means coupling the motor outtake shaft to the worm-gear intake shaft and means coupling the worm wheel to the worm-wheel outtake shaft which activates the rotating post, the improvement comprising:

• emergency means for uncoupling the worm-wheel outtake shaft from the worm wheel in relation to their rotation, comprising the worm wheel mounted completely over the outtake shaft and a coupling that can be disengaged between the outtake shaft and the worm wheel, including recesses in the outtake shaft and axial grooves in an inner surface of the worm wheel and balls forcable into the recesses in the outtake shaft while simultaneously engaging the axial grooves in the inner surface of the worm wheel, wherein the recesses in the worm-wheel outtake shaft are longer axially than the diameter of the balls, wherein one end of the outtake shaft that is remote from the rotating post has an axial bore that the recesses lead into and that accommodates a cylindrical slide having a surface against which the balls rest and an initial longitudinal section with a diameter that ensures that a prescribed volume of each ball will project out of the recesses, and which has an adjacent longitudinal section with a diameter that continuously decreases to such a length that the balls will completely enter the recesses;
• and means for displacing the slide to a prescribed extent against the force of a compression spring, wherein the inside diameter of the axial bore in the worm-wheel outtake shaft is longer at all points than the outside diameter of the cylindrical slide at the same points, means freely suspending the slide comprising a ball-and-socket joint on the means for displacing the slide, wherein the worm gear has a housing and the means for displacing the slide has two parallel annular plates that extend perpendicular to the axis of the slide and can rotate independently, and that have adjacent sloping surface, one plate being axially and frictionally secured to the slide and the other rigidly fastened to the housing of the worm gear.