Abstract: A manual drive for producing rotary movement in both clockwise and counterclockwise directions includes a drive lever which has a neutral position from which it can move into a first or second rotary direction. Attached to the drive lever are a pair of detent elements, one controlling clockwise rotation of the drive wheel and the other controlling counter-clockwise rotation. The detent elements have teething elements on a free end for engagement with a drive wheel which has counter teething about its circumference. The detent elements engage the drive wheel in the neutral position. The detent elements slide in a slide guide which lifts one of the detent elements out of engagement with the drive wheel when the drive lever moves in the opposite rotary direction. Springs located on either side of the slide guide lift the detent element on the drive side out of engagement with the drive wheel as the drive lever returns to the neutral position.