Patent ID: 7947234

Claim:
A liquid-end assembly for a handheld multichannel pipette, the liquid-end assembly comprising: a housing for the liquid-end assembly, wherein the housing is configured to receive a plunger shaft connectable to a drive mechanism of the pipette for axial movement of the plunger shaft in the housing; a plurality of cylinders mounted within the housing; a plurality of air displacement pistons each mounted for axial movement in and through an open upper end of one of the cylinders in response to axial movement of the shaft in the housing; a plurality of nozzles, each connected to a respective one of the plurality of cylinders, and each with a lower open end extending from a bottom wall of the housing; and a spacing adjustment mechanism configured to be manipulated by a user and to displace at least one nozzle from another relative to rotation of an adjustment component, the adjustment component comprising a rotatable nozzle spacing cam having a plurality of helical grooves.