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Pipette and pipetting apparatus

  • US 4,830,832 A
  • Filed: 12/12/1986
  • Issued: 05/16/1989
  • Est. Priority Date: 12/17/1985
  • Status: Expired due to Term
First Claim
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1. A pipetting apparatus comprising:

  • a plurality of pipettes each having a pipette body having a first end section and;

    a pipette piston positioned within the pipette body having a second end section;

    the first and second end sections of the pipette body and the pipette piston forming a suction tip with substantially no clearance between the first and second end sections;

    a portion of the second end section of the pipette piston extending beyond the first end section of the pipette body in a final position;

    at least one of the pipette body and the pipette piston being electrically conductive,a pickup devices each including a first assembly for receiving the pipette body and a second assembly for receiving the pipette piston;

    means for moving the first and second assemblies; and

    at least one of the first and second assemblies being electrically conductive;

    a first receiving device for receiving a plurality of test containers;

    a second receiving device for receiving at least one assembly with vessels, which are arranged in a geometrically regular pattern;

    a third feeding device for feeding pipettes from a pipette hopper to the pickup devices;

    said first, second and third devices being fixedly arranged adjacent each other in a chassis and accessible from above;

    a fourth dosing device provided with the pickup devices and movably disposed above said chassis in order to pick up pipettes in said third feeding device by means of the pickup devices, to absorb liquid from the containers in said first receiving device, and to discharge the absorbed liquid from the pipettes on said at least one assembly and then to eject the pipettes, said fourth device having one support for each pickup device, said supports being arranged side by side in a row, and adjusting means for proportionally adjusting the distance between said supports.

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