Pipette with adjustable dosing volume

A pipette with an adjustable volume, the pipette comprising:

• a housing comprising an outside surface extending from an upper end to a lower end;
• at least one seat configured to releasably hold a pipette tip on the lower end of the housing, wherein the at least one seat defines an opening;
• a displacement apparatus defining a displacement chamber comprising a displacement element configured to be displaced therein;
• a connecting channel configured to connect the displacement chamber to the opening of the at least one seat;
• a stroke rod coupled to the displacement element and configured to be displaced in a longitudinal direction relative to the housing in order to displace the displacement element within the displacement chamber;
• a control button connected to the upper end of the stroke rod and projecting from the housing;
• a stop element positioned on an outer circumference of the stroke rod, wherein the stop element comprises, an upper stop for the stop element, and
• a lower stop for the stop element, wherein the upper and lower stop elements limit a stroke of the stroke rod;
• an adjusting apparatus configured to adjust a position of the upper stop in the housing;
• a display apparatus configured to display a set dosing volume;
• a coupling apparatus positioned between the adjusting apparatus and the display apparatus and configured to couple the adjusting apparatus to the display apparatus in an engaged state and configured to uncouple the adjusting apparatus from the display apparatus in a disengaged state, wherein the coupling apparatus is further configured to be coupled and uncoupled by inserting a calibration tool into the housing from an opening defined in the outside surface of the housing;
• and
• a calibration apparatus comprising:
• a first wheel accessible from outside the housing and mounted in a second bearing within the housing and configured to be rotatable about an axis of rotation and further configured to be translationally displaceable in a direction of the axis of rotation;
• and
• a second wheel configured to contact the first wheel and couple to the display apparatus, wherein the second wheel is rotated as a result of rotating the first wheel, and wherein the rotation of the second wheel changes a setting of the display apparatus.

A set comprising:

• a pipette with an adjustable volume, comprising:
• a housing comprising an outside surface extending from an upper end to a lower end;
• at least one seat configured to releasably hold a pipette tip on the lower end of the housing, wherein the at least one seat defines an opening;
• a displacement apparatus defining a displacement chamber comprising a displacement element configured to be displaced therein;
• a connecting channel configured to connect the displacement chamber to the opening of the at least one seat;
• a stroke rod coupled to the displacement element and configured to be displaced in a longitudinal direction relative to the housing in order to displace the displacement element within the displacement chamber;
• a control button connected to the upper end of the stroke rod and projecting from the housing;
• a stop element positioned on an outer circumference of the stroke rod, wherein the stop element comprises,
• an upper stop for the stop element, and
• a lower stop for the stop element, wherein the upper and lower stop elements limit a stroke of the stroke rod;
• an adjusting apparatus configured to adjust a position of the upper stop in the housing;
• a display apparatus configured to display a set dosing volume;
• a coupling apparatus positioned between the adjusting apparatus and the display apparatus and configured to couple the adjusting apparatus to the display apparatus in an engaged state and configured to uncouple the adjusting apparatus from the display apparatus in a disengaged state;
• and
• a calibration tool comprising:
• a shaft having a profile adapted to a tool engagement portion of a first wheel;
• and
• a handle that is non-rotatably connected to the shaft,
• wherein a rotary lever is configured to be pivoted by the shaft being inserted into the opening of the housing to a first positon, wherein insertion of the shaft further to a second position brings the first wheel into frictional connection with a second wheel, and
• wherein rotation of the calibration tool acts to rotate the first wheel, which causes rotation of the second wheel.