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Pipette with blocking system

A technology for a pipette and a housing, applied in the field of pipettes, can solve the problems of force-rotating operating element damage, high force consumption, installation cost, etc., and achieve the effects of improving reliability, reducing errors, and labor-saving unlocking

Active Publication Date: 2013-12-18
EPPENDIRF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The known closures have the disadvantage that they can be destroyed in the closure device by turning the operating element with increased force
In addition, it is laborious to press the unlock button down and adjust the dosing volume at the same time
In addition, relatively high force consumption is required to operate the wedge-shaped drive (Keilgetriebe) consisting of buttons and levers
In addition, teeth meshing in the toothed ring of the transmission part limits the accuracy of adjusting the metered volume
Furthermore, the assembly of the many individual components is complex

Method used

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  • Pipette with blocking system
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Examples

Experimental program
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Effect test

Embodiment Construction

[0070] In this application, the terms "upper" and "lower", "above" and "below" and "horizontal" and "vertical" refer to the pipette when the housing with the stand is pointing vertically downwards. orientation. In this orientation, the pipette tip mounted on the stand can be aligned with the underlying container for aspirating or dispensing liquid.

[0071] according to figure 1 and 2 , the pipette 1 has a rod-shaped housing 1 . The housing upper part 2 with all contained components forms the drive unit, and the housing lower part 3 with all contained components forms the discharge unit. A cylindrical button-shaped operating element 4 protrudes above from the housing upper part 2 . The operating element 4 is mounted axially displaceably and rotatably in the upper housing part 2 .

[0072]The operating element 4 is screwed onto the cylindrical lifting rod 6 by means of a thread in the cover 5 . Lifting rod 6 is guided through upper channel 7 of threaded spindle 8 in housi...

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PUM

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Abstract

The pipette (1) has a transfer element (19) and display adjustable unit (23) that are coupled to the transmitting portions (20,21) for transmitting a rotary movement of the transfer element to a movement of display adjustable unit. A circular cylindrical locking element is arranged on the outer circumference of the transfer element. The locking portion and the unlocking elements (106) are coupled to the transmitting unit for transferring the movement of the unlocking element relative to the housing to the movement of the locking portion from the locking position.

Description

technical field [0001] The invention relates to a pipette with replaceable pipette tips. Background technique [0002] Pipettes are used especially in laboratories for metering liquids. For this purpose, the pipette tip is clamped to the holder of the pipette via the upper opening. The seat is mostly a conical or cylindrical projection relative to the pipette housing, onto which the pipette tip can be clamped via the upper opening. Through the lower opening, the pipette tip can absorb and expel liquid. Air-cushion pipettes (Luftpolster pipettes) comprise an outlet for the air, which is connected in communication with the pipette tip via a hole in the holder. With the aid of the ejection device, the air cushion is moved so that liquid is sucked into or ejected from the pipette tip. For this purpose, the discharge device has a discharge chamber with a movable stop. The discharge device is usually a cylinder with a movable piston inside. [0003] After the pipette tip has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01L3/02
CPCB01L3/0224B01L2200/148
Inventor J·维尔默I·温特
Owner EPPENDIRF AG