Variable drive mechanism for the panel of a gate or similar structure

An arrangement for controlling a drive mechanism with a driving motor for moving a gate back and forth between two limiting positions and selectively through at least one stop position along a predetermined path, comprising:

• switching means for determining when a predetermined limiting position or stop position is being approached and emitting signals to switch off operating power to said motor;
• at least one reference-point detector for generating a sychronization signal when said gate travels through a predetermined reference-point position between said limiting positions;
• memory means for accepting, storing, and emitting data of said limiting positions and data of said selectively at least one stop position;
• and a position detector for supplying a value representing every actual position traveled through by said gate said position detector receiving a positional-value readjustment dependent on said sychronization signal, said position detector releasing an output signal for switching off the operating power to said motor dependent on the direction the reference-point position is traveled through according to the predetermined limiting position or the stop position of said gate along said direction and selectively determining by a related output from said memory means once said gate arrives at said reference-point position;
• said reference-point detector comprising a bistable switch and said memory means comprising non-volatile electrical means, so that depending on a switch state of said reference-point detector, said gate being shiftable out of a current position only toward said reference-point position when said drive mechanism is operative and a corresponding adjustment of said position detector is absent;
• a pivoting permanent magnet with a stationary pivot polarized perpendicular to an axis of rotation of said pivot;
• a switching magnet comprising a further permanent magnet and following the motion of said gate, so that as said gate travels through said reference-point position, said switching magnet forcing magnetically said pivoting permanent moving out of one pivoted limiting position and into another pivoted position;
• a stationary stabilizing magnet retaining magnetically said pivoting permanent magnet in whatever limiting position occupied by said pivoting magnet with reduced magnetic strength;
• stationary magnetically activated switching means with a reed contract triggered by said pivoting magnet when said pivoting magnet is in one limiting position, said magnetically activated switching means being not triggered when said pivoting magnet is in another limiting position.