Drive device with a locking device to prevent switch shaft rebound

A drive device for a multi-pole power switch comprising:

• a switch shaft in common for several poles;
• toggle levers configured for linkage with a spring energy store for actuating the shaft for a power on sense and utilizing pole-side breaking forces for a power off sense;
• a resetting spring;
• a fixed bearing;
• at least one retainer that is secured to the switch shaft;
• a clamp that is pivotable about the fixed bearing, said clamp being actuatable by the retainer for protection against rebounding of the switch shaft from its final position upon power off, wherein the retainer has a working surface for cooperation with the clamp so as to form a connection therewith;
• and
• wherein the clamp has an aperture open on one side and a curved outer wall portion which is adapted to cooperate with the retainer, and wherein the retainer and the clamp are configured with a degree of overlapping upon juxtaposition with one another so that the overlapping between the retainer and the clamp is dimensioned to be considerably larger than is necessary to block the switch shaft from turning back.