Patent ID: 7652218

Claim:
An energy accumulator for an on-load tap changer having a longitudinally movable loading slide connected to a drive shaft and an also longitudinally movable release slide connected to an output shaft, at least one force-storing spring being provided between the loading slide and the release slide, the loading slide being movable in a straight line alternatively in one of two opposed directions upon each switching of the on-load tap changer by the rotating drive shaft so that the force-storing spring can be loaded, after reaching the new end position of the loading slide, the hitherto locked release slide being released such that it suddenly follows the movement of the loading slide, and the straight-line movement of the release slide being converted into a rotational movement of the output shaft, characterized in that two rollers are disposed on a side of the release slide facing the output shaft, the rollers sliding in a rotatable formation facing them, the formation also being connected to the output shaft, the formation has an inner flank as well as an outer flank that are designed such that during a first part of each movement of the release slide the first roller is a first positively guided in the formation and the second roller can be moved freely, that during a second part of each movement of the release slide, the second roller that until then was freely movable is positively guided and the first roller that was until then positively guided is freely movable, and that during a third part of each movement the first roller that was until then freely movable is positively guided again, and the second roller that was until then positively guided is freely movable.