Mechanical pipette with adjustable volume value of aspirated liquid

摘要

Mechanical pipette with adjustable volume value of aspirated liquid is built of a handle (1) and a nozzle (3) and coupled with them: an ejection mechanism of a pipette exchangeable tip (8), a drawing up and discharging mechanism with a plunger (33) mounted in said pipette nozzle (3), a plunger working stroke adjustment mechanism, a manually actuated lock mechanism of a drive assembly of an adjustment screw of the plunger working stroke, a mechanical counter, a drive mechanism of a mechanical counter and a calibration mechanism for correction of the pipette accuracy deviation. The calibration mechanism comprises, mounted in the mechanical counter, releasable coupling means for complete disengagement of a revolvers assembly from the mechanical counter drive mechanism in CALIBRATION MODE, further, engaged with them, changeover means for changing over the pipette into CALIBRATION MODE and resetting means of the indication of the liquid volume value on the counter in CALIBRATION MODE.

主权项

1. A mechanical pipette with an adjustable volume value of aspirated liquid, comprising a handle and a nozzle, and coupled with said handle and said nozzle:
a pipetting button connected with a plunger disposed in said pipette, a plunger working stroke adjustment mechanism screw, a mechanical counter responsive through a mechanical counter drive mechanism to rotation of the adjustment screw configured to indicate a volume value of liquid drawn-up by the pipette depending on an adjusted plunger working stroke, and a calibration mechanism configured to correct pipette deviation between the actual volume value of dispensed liquid and the liquid volume value indicated on said mechanical counter, said calibration mechanism comprising a releasable coupling which disengages said mechanical counter from said drive mechanism, and a manually operated reset element coupled with said mechanical counter configured to reset a liquid volume value indication on said mechanical counter while said mechanical counter is disengaged from said drive mechanism.