Joint for Device for Metering Liquids

a technology of metering liquid and joint device, which is applied in the direction of fluid controller, laboratory glassware, engine seal, etc., can solve the problems of user fatigue, physical damage, and more user fatigu

Inactive Publication Date: 2015-03-26
SOCOREX ISBA SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution significantly reduces user fatigue and the risk of leakage by minimizing friction forces, allowing for more efficient and comfortable liquid metering across various device sizes, including small-volume pipettes, and enabling the use of lower-power motors in electronic devices.

Problems solved by technology

As pipetting operations are repetitive, they entail tiredness for the user, then contractions and, according to document US 2002 / 0012613, even physical damages.
The stronger the spring, the more the user uses his / her force to activate the metering button and thus the more her / she gets tired.
However, in order to use a less strong spring, the contact force N and thus the friction exerted by the joint should be reduced, which would consequently increase the risk of a leakage i.e. for example the risk that the vacuum might not be maintained during the suction of the liquid.
The reduction in the tolerances on the O-ring and the housing thereof is possible but entails increases in the manufacturing and control costs.
Finally, controlling the resulting friction force F is difficult with the O-rings.
A minimal constant value can hardly be reached by reducing the contact pressure without increasing the risk of a leakage.
Such joints have the drawback of being difficult to produce and to mount in the device when the piston has a small diameter as is the case with small volume pipettes, for example pipettes for metering volumes of the order 1 to 200 microliters.

Method used

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  • Joint for Device for Metering Liquids
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  • Joint for Device for Metering Liquids

Examples

Experimental program
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Embodiment Construction

[0054]The following description is given as a non-limitative illustration and refers to the appended drawings which show examples of several implementations of the metering device according to the invention.

[0055]In the context of such description, the location indications such as “high”, “low”, “upper”, “lower”, “external”, “internal”, “horizontal” and “vertical” should be understood directly with respect to the drawing such as shown in a made-up Figure. In the Figures, the objects are shown with their natural orientation i.e. with the orientation they have if the metering device which they belong to is held in a position of utilization. For example, a mono-channel pipette comprising a main axis is oriented so that such axis is vertical. This is also the case with a metering device for a bottle positioned on a bottle, or a manual pipette in the pipette holder thereof.

[0056]FIGS. 1 to 3 show a joint provided for a pipette according to a first embodiment of the device of the inventio...

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PUM

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Abstract

The present invention relates to a device for metering liquids, for example a pipette or a metering button. The device comprises a joint forming a seal between a hollow cylinder and a piston housed inside the cylinder, the piston being moved vertically so as to suck in or expel the liquid. During the metering operation, the joint remains fixed with respect to the movement of the piston and comprises parts formed by portions having dedicated geometric and mechanical characteristics which make it possible to locally optimize the functions the sliding, sealing, and fastening in the cylinder.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a device for metering liquids, in particular in a laboratory. It is more particularly related to the metering of liquids in relatively small but accurate quantities, for example of the order of the μl up to 100 ml. More particularly the invention relates to a pipette, a metering device for a bottle or a syringe.STATE-OF-THE-ART AND PROBLEMS FROM WHICH THE INVENTION ORIGINATES[0002]Document US 2002 / 0012613 describes, in the introduction thereof, the problems connected with the metering of liquids using a laboratory device, for example a pipette. When working in a research laboratory or during routine measuring in a biomedical or an industrial medium, the user of a pipette may have to execute a very large number of liquid sucking or expelling operations. As pipetting operations are repetitive, they entail tiredness for the user, then contractions and, according to document US 2002 / 0012613, even physical damages. As exemplary...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B01L3/02
CPCB01L3/0217B01L2400/0478B01L2200/0605F16J15/3232
InventorULDRY, JEAN-PIERRE
OwnerSOCOREX ISBA SA