| CPC B01L 3/0224 (2013.01) [B01L 2200/148 (2013.01); B01L 2300/026 (2013.01)] | 20 Claims |
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1. A pipette with an adjustable volume, the pipette compromising:
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; and
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 comprises,
a shaft mounted in a first bearing within the housing and configured to be translationally displaceable in a direction of the axis of rotation,
a first gear mounted to the shaft and configured to be rotated about an axis of rotation,
a second gear configured to mesh with the first gear,
a cam mechanism comprising a first mechanism element that is coupled to the shaft and a second mechanism element that is arranged in the housing, and
a rotary lever connected to the first mechanism element and configured for conjoint rotation therewith,
wherein the first gear is inhibited from shifting upward on the shaft and the first mechanism element is inhibited from shifting downward on the shaft, and
wherein by pivoting the rotary lever, the shaft is configured to be translationally displaced via the cam mechanism and the first gear is configured to be disengaged from the second gear in order to uncouple the adjusting apparatus from the display apparatus.
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