Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1989-10-23
1991-05-07
Noland, Tom
Measuring and testing
Sampler, sample handling, etc.
Capture device
G01N 114, B01L 302
Patent
active
050126822
ABSTRACT:
A pipetting device is provided at its top with an actuating element, which is depressible against spring action and which is connected to a piston, which is movable in a cylinder to move an air volume. The cylinder communicates with an opening in a particularly conical pipette connector, on which a pipette tip which open-topped and open-bottomed is adapted to be slidably fitted. The pipettable volume is adapted to be adjusted by a rotation of the actuating element. The actuating element consists of a knob, which is axially movable to establish and separate a detent element joint between a screw and a nut which is fixed in the housing. By a rotation of the actuating knob the screw can be rotated in said nut to impart an axial movement to a piston rod, which is connected to the piston so that the latter is infinitely adjustable in known manner. At least one of the detent elements which constitute the detent element joint comprises teeth which are spaced around the center line of the pipetting device. The detent element joint preferably comprises two meshing gears, which are non-rotatably connected to the actuating element and to the housing, respectively.
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Firma Eppendorf-Netheler-Hinz GmbH
Noland Tom
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