Pipetting device
US5012682A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1989 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Oct 23, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01L3/0224
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.