Pipette

Abstract

Abstract The subject of the present invention is a pipette comprising a cylindrical handle portion (1), a frame portion (2) connected to same, in whose cylinder space a piston (3) is fitted for sucking liquid into, and removing liquid from, a tip (4) connected to the lower end of the frame portion (2) and functioning as a liquid container. The piston (3) is provided with two piston rods (8 and 9) fitted inside each other, each of them being at the upper end provided with a knob (16 and 17). Out of the said piston rods (8 and 9), the stroke of the inner, secondary piston rod (9) is longer than the stroke of the second piston rod (8), surrounding the first one. Moreover, the piston rods are prevented from rotating in relation to the handle portion (1). According to the invention, around the piston rod (9), a sleeve-shaped adjustment device (12) has been fitted by means of a threaded joint for the purpose of calibration of the pipette, while the adjustment device is placed in the chamber space of the upper end of the handle portion (1) and is supported by means of shoulders against the support portion (13) of the handle portion (1). The turning of the adjustment device (12) in relation to the piston rod (8) so as to adjust or calibrate the pipette has been arranged as taking place from outside the pipette by using the adjustment and calibration unit.

Inventors

• 👤 Osmo Suovaniemi

Bibliographic Details