Abstract: The invention relates to liquid dispensing and concerns a pipette comprising at least one aspiration channel with a piston. At the lower end of the aspiration channel there is an extension channel (3) and at its end a pipette tip mounting piece (4) onto which a pipette tip (5) is attached. On the pipette tip mounting piece there is a surrounding groove (17) and in the groove a sealing ring (18). The width of the groove in the axial direction is at least 1.1 times the thickness of the sealing ring in the axial direction. When the mounting piece is pushed into the pipette tip, the inner wall of the tip can move the sealing ring upwards in the groove. The construction can provide a reliable sealing despite of inherent dimension differences between different tips and mounting pieces.

Abstract: The invention relates to liquid dispensing and concerns a pipette comprising at least one aspiration channel with a piston. At the lower end of the aspiration channel there is an extension channel (3) and at its end a pipette tip mounting piece (4) onto which a pipette tip (5) is attached. On the pipette tip mounting piece there is a surrounding groove (17) and in the groove a sealing ring (18). The width of the groove in the axial direction is at least 1.1 times the thickness of the sealing ring in the axial direction. When the mounting piece is pushed into the pipette tip, the inner wall of the tip can move the sealing ring upwards in the groove. The construction can provide a reliable sealing despite of inherent dimension differences between different tips and mounting pieces.

Abstract: The invention relates to liquid dispensing and concerns a multichannel pipette, which comprises on its lower tip a shelf in the transverse direction of the tip and to which lower tip a pipette tip can be attached, which pipette tip comprises at least one longitudinal claw, whereby when the pipette tip is in its place, the point of the claw is above the shelf. Each cylinder is connected with a claw opening comprising an opener so that by pressing the opener downwards the claws can be turned outwards off the shelf. The opening mechanism further comprises an organ resilient in the longitudinal direction. In accordance with the invention, the tip removal is made to function reliably, even if there were significant differences in the dimensioning of the opening constructions of the lower tips.

Abstract: The invention concerns a pipette, which comprises a tip part (1) through which there is an air channel and on the outer end of which a tube-like tip container (2) can be attached with friction joint. The tip part comprises a structure, which at least on the attachment area (8) of the tip container has a surface layer (7) and inside thereof a body part (6) more flexible than the surface layer so that the structure yields when the tip container is attached.

Abstract: The invention relates to a tray for sample vessels comprising a plurality of orifices (2) in matrix configuration. One orifice has two positioning walls (10) defining a positioning corner. In addition, the orifice is provided with a pushing means (13), such as a flexible pushing means, which presses a sample vessel inserted into the orifice towards the positioning corner.

Abstract: The invention relates to a tray for sample vessels comprising a plurality of orifices (2) in matrix configuration. One orifice has two positioning walls (10) defining a positioning corner. In addition, the orifice is provided with a pushing means (13), such as a flexible pushing means, which presses a sample vessel inserted into the orifice towards the positioning corner.