Adjusting device, especially for locking of motor vehicle doors

An adjusting device, for vehicular door locks comprising:

• a drive motor;
• a crank which, in each adjusting action, may be driven by said drive motor at a swivelling angle of 180 degrees in the same direction of rotation;
• a slide having a push rod and adjustable by said crank between two end positions;
• said slide being coupled with said crank during part of its swivelling motion, but in said end positions being decoupled from said crank after a swivelling angle of 180 degrees, so that said slide is then smoothly adjustable between its end positions;
• and
• adjusting force checking means operable in each adjusting action for checking the adjusting force of said drive motor and interrupting the decoupling between said crank and said slide only when the adjusting force of said drive motor exceeds a minimal value which is at least as great as a predetermined maximally necessary adjusting force;
• wherein said adjusting force checking means includes:
• a part which is continuously operatively connected with said drive motor, and
• a locking element for engaging said part, said locking element exerting a locking force on said part which has to be overcome in each adjusting action for an interruption of the decoupling between crank and slide;
• said locking force being the maximally necessary adjusting force for said slide.