Process and device for dispensing a predetermined amount of a liquid substance into a vessel
OwnerJean Guiganinventor
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Abstract
The invention relates to a process and a device for dispensing a predetermined amount of a liquid substance into a vessel. The device comprises a pipette (1) provided with a piston (5) for pumping of the liquid substance, a sleeve (19) for cooling the lower tube (2) of the pipette and means (23,24,25) for cutting the thread (40) of frozen substance leaving the calibrated tube when pressure is applied on the piston. Application to measuring out of reagents in laboratory analyses.
Claims13
Process for dispensing a predetermined amount of a liquid substance into a vessel, said process comprising the following steps:
- causing a portion of said substance to pass into a tubular part whose lower portion is calibrated tube which is arranged vertically above the vessel,
- applying a downwardly directed vertical pressure on the upper surface of the substance which has been taken up in the tubular part,
- cooling said lower portion of the tubular part sufficiently to form a continuous vertical thread of frozen substance, and
- under the influence of said pressure, extruding said thread from said calibrated tube bottom, and
- cutting the thread such that a detached portion of predetermined length which has been removed from the thread falls by gravity into the vessel, whereby said detached portion constitutes, after regaining the liquid state, said predetermined dispensed amount.
Device for dispensing a predetermined amount of a liquid substance into a vessel, said device comprising a tubular part which is arranged vertically above the vessel, the lower portion of the tubular part comprising a calibrated tube, means for causing a portion of said substance to pass into the tubular part, means for cooling the calibrated tube, means for applying a downwardly directed vertical pressure on the upper surface of the substance received by the tube, simultaneously with said means for cooling in order to extrude a continuous vertical thread of the frozen substance below the calibrated tube, and means for cutting the thread so as to separate a detached portion of thread having a predetermined length, whereby said detached portion is received by gravity in the vessel, constitutes, after regaining the liquid state, said predetermined dispensed amount.
Dependencies are inferred from the claim text.