Pipetting device

In a pipetting device for detachably holding and for actuating a syringe comprising a syringe body, a piston, which is reciprocably mounted in said syringe body, and a piston rod connected to said piston, in combination:

• a housing provided with retaining means for detachably holding said syringe body so that said piston rod extends in a longitudinal direction of said housing,
• first and second sliders, which are mounted in said housing and extend in and are movable in said longitudinal direction and are transversely spaced apart,
• connecting means carried by one of said sliders and detachably connectable to said piston rod,
• first and second racks carried by said first and second sliders, respectively,
• a pinion, which is rotatably mounted in said housing and on diametrically opposite sides of said pinion is in mesh with said first and second racks, respectively,
• a detent carrier mounted in said housing and movable in said longitudinal direction,
• an actuating lever connected to said detent carrier and extending out of said housing,
• a transverse track provided on said detent carrier and extending transversely to said longitudinal direction,
• a transverse slider mounted on said transverse track and movable along the same and carrying end stops, which are spaced apart transversely to said longitudinal direction,
• two slider stops carried by said first and second sliders, respectively, and adapted to cooperate with said end stops in alternation in dependence on the position of said transverse slider,
• shifting means movably mounted on said detent carrier and arranged to be shifted in response to a reciprocation of said first and second sliders, and
• resetting means comprising spring means for automatically resetting said detent carrier and said actuating lever to an initial position,
• the arrangement being such that the transverse slider extending into the path of one of said first and second sliders is moved into the path of the other of said sliders in response to the resetting of said actuating lever to said initial position.