Pipette with adjustable dosing volume

A pipette with an adjustable dosing volume comprising:

• a housing comprising an upper end and an opposing lower end;
• at least one seat connected to the housing and configured to releasably hold a pipette tip to the lower end of the housing;
• a displacement device positioned within the housing and comprising,
• a displacement chamber fluidly connected to the at least one seat, and
• a displacement element configured to move within the displacement chamber to aspirate and discharge liquid from the pipette tip;
• a stroke rod coupled to the displacement element and configured to be longitudinally displaced relative to the housing to displace the displacement element within the displacement chamber;
• a control button configured to connect to the stroke rod to control movement of the stroke rod, wherein at least a portion of the control button projects from the housing;
• a threaded spindle comprising at least one catch and defining a central spindle hole configured to guide the stroke rod;
• a catch sleeve rotatably mounted within the housing and comprising an output shaft and at least one groove extending in a longitudinal direction that is configured to engage the at least one catch of the threaded spindle;
• a counter configured to detect the rotation of the catch sleeve and display a dosing volume;
• an adjusting sleeve rotatably mounted within the housing and comprising an input shaft;
• an adjusting element accessible from an outside of the housing and connected to the adjusting sleeve;
• and
• a transducer shaft rotatably mounted within the housing and comprising a countershaft of a gearbox, wherein the gearbox comprises,
• a shifting device, and
• a shift element accessible from outside of the housing, wherein the shift element is configured to shift the gearbox between different shift stages,
• wherein each different shift stage comprises different gear ratios between a rotational speed of the adjusting sleeve and a rotational speed of the catch sleeve, and
• wherein the different gear ratios enable coarse volume adjustment and fine volume adjustment.