Positive-displacement pipette

Measuring and testing – Sampler – sample handling – etc. – Capture device

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Details

7386417, 7386418, B01L 302, G01N 114

Patent

active

053557387

ABSTRACT:
A positive-displacement pipette is provided comprising a longitudinally extending body portion having a bore passing therethrough, a hand grip portion disposed at one end of the body, and a tip portion coupled to and coaxially extending from the hand-grip portion. A cylinder is employed connected to and extending coaxially from the tip portion of the pipette, wherein the cylinder has a jet at its bottom end and a piston rod extending through the cylinder to the jet. A gripping arm in the form of a slidable sleeve is movably supported within the bore of the body and is adapted for gripping the piston rod by force applied to the slidable sleeve to thereby cause the sleeve to attach itself to the piston rod by friction. A device located on the hand grip portion of the body is provided for applying force to the slidable sleeve and hence to the piston rod extending through the cylinder to the jet.

REFERENCES:
patent: 3244009 (1966-04-01), Tietje et al.
patent: 3757585 (1973-09-01), Heller et al.
patent: 3830108 (1974-08-01), Spong
patent: 4141250 (1979-02-01), D'Autry
patent: 4165646 (1979-08-01), Shapiro
patent: 4362064 (1982-12-01), d'Autry
patent: 4466298 (1984-08-01), Tervamaki et al.
patent: 4474071 (1984-10-01), d'Autry
patent: 4567780 (1986-02-01), Opperlander et al.
patent: 4616514 (1986-10-01), Magnussen, Jr. et al.
patent: 4967604 (1990-11-01), Arpagus et al.

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