Pipette

A pipette with

• a displacement unit comprising a rod-shaped lower housing part (3) with a displacement chamber (57) disposed therein with a shiftable boundary (58), a contact element (63), connected to the shiftable boundary (58), at an upper housing opening (67) at the top of the lower housing part (3), a shoulder (50) for connecting to a pipette tip (51) at the bottom of the lower housing part (3), and a connecting channel (56) between the displacement chamber (57) and the free end of the shoulder (50),
• a drive unit for driving the shiftable boundary (58) of the displacement unit in a rod-shaped upper housing part (2), a drive device (6) disposed therein, an actuating element (4) at the upper housing part (2) interacting with the drive device (6), and a drive element (34) at a lower housing opening (45) at the bottom of the upper housing part (2), interacting with the drive device (6), the drive element being shiftable downward in the actuating direction by actuating the actuating element (4), in order to perform a dosing stroke of the shiftable boundary (58),
• means for the detachable connection (46, 54) that detachably connects together the upper housing part (2) and the lower housing part (3) into a rod-shaped housing in an arrangement in which the drive element (34) rests on the contact element (63),
• an ejection device (71) which has an ejection slider (72) shiftably disposed at the lower housing part (3) where the ejection slider on the bottom has an ejection end (73) for detaching a pipette tip (51) from the shoulder (50), and the ejection device (71) further has, shiftably disposed on the upper housing part (2), an ejection extension (74) that is connected at the bottom to the upper end of the ejection slider (72) and at the top has an actuating end (78),
• an end stop (32) disposed fixed to the housing in the upper housing part (2) and connected securely to the upper housing part (2), and an end stop element (38) securely connected to the drive element (34) for limiting the downward shift of the drive element (34),
• a decoupling device (44) between the drive device (6) and a drive element (34) that decouples the drive element (34) from the drive device (6) in the case of contact of the end stop element (38) at the end stop (32) and continued shifting of the actuating element (4) in the actuating direction, and
• coupled to the drive device (6), a lower stop body (27) that upon decoupling of the drive element (34) from the drive device (6) by the decoupling device (44) strikes an actuating end (78) of the ejection extension (74) in order, while further shifting of the actuating element (34) in the actuating direction, to shift downward the ejection extension (74) and the ejection slider (72).