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1. EP1240493 - ADJUSTABLE PIPETTE

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Office
European Patent Office
Application Number 00983914
Application Date 05.12.2000
Publication Number 1240493
Publication Date 18.09.2002
Publication Kind A4
IPC
B01J 4/02
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
4Feed devices; Feed or outlet control devices
02for feeding measured quantities of reagents
B01L 3/02
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
LCHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
3Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
02Burettes; Pipettes
G01N 1/10
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
1Sampling; Preparing specimens for investigation
02Devices for withdrawing samples
10in the liquid or fluent state
G01F 11/04
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
11Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
02with measuring chambers which expand or contract during measurement
04of the free-piston type
CPC
B01L 3/0224
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
LCHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
3Containers or dishes for laboratory use, e.g. laboratory glassware
02Burettes; Pipettes
021Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
0217of the plunger pump type
0224having mechanical means to set stroke length, e.g. movable stops
B01L 3/02
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
LCHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
3Containers or dishes for laboratory use, e.g. laboratory glassware
02Burettes; Pipettes
Applicants GILSON WARREN E
Inventors GILSON WARREN E
Designated States
Priority Data 0032974 05.12.2000 US
09456610 08.12.1999 US
Title
(DE) ADAPTIERBARE PIPETTE
(EN) ADJUSTABLE PIPETTE
(FR) PIPETTE REGLABLE
Abstract
(EN) An adjustable pipette (10) includes a body (12) containing a plunger assembly (14) including a thumb button (22) that is axially moved in alternating relatively shorter sample aspirating and relatively longer dispensing strokes. Guide slots (108) in a guide sleeve (32) receive a stop pin (52) carried by a plunger shaft (48), and the slots (108) define two axially and circumferentially spaced lower stops (104, 106) for aspirating and dispensing strokes respectively. The thumb button (22) includes offset lobes (112, 114) that apply a rotational torque to the plunger shaft (48) when pressed by the user. The user presses one lobe (112) for an aspirating stroke to rotate the plunger shaft (48) in one direction and align the stop pin (52) with uppermost lower stop (104) for a relatively short aspirating stroke and the user presses the other lobe (114) for a dispensing stroke to rotate the plunger shaft (48) in the other direction and align the stop pin (52) with lowermost lower stop (106) for a relatively long dispensing stroke. A window (116) in the body permits the user to view and thereby understand the function of the lower stop selecting mechanism.
(FR) L'invention concerne une pipette réglable (10) comprenant un corps (12) contenant un ensemble piston (14) lequel comprend un bouton poussoir (22) déplacé de manière axiale en alternant une course d'aspiration d'échantillon relativement courte et une course de diffusion relativement longue. Des rainures de guidage (108) ménagées dans un manchon de guidage (32) reçoivent une goupille d'arrêt (52) maintenue par une tige de piston (48). Les rainures (108) définissent deux arrêts (104, 106) inférieurs espacés de manière axiale et circulaire qui sont destinées aux courses d'aspiration et de diffusion respectivement. Le bouton poussoir (22) comprend des lobes décentrés (112, 114) qui appliquent un couple de rotation à la tige de piston (48) lorsqu'ils sont pressés par l'utilisateur. L'utilisateur presse un lobe (112) de sorte qu'une course d'aspiration face tourner la tige de piston (48) dans une direction et qu'elle aligne la goupille d'arrêt (52) avec l'arrêt le plus haut (104) pour une course d'aspiration relativement courte. L'utilisateur presse l'autre lobe (114) de sorte qu'une course de diffusion face tourner la tige de piston (48) dans l'autre direction et qu'elle aligne la goupille d'arrêt (52) avec l'arrêt le plus bas (106) pour une course de diffusion relativement longue. Une fenêtre (116) ménagée dans le corps permet à l'utilisateur de visualiser et, ainsi, de comprendre le fonctionnement du mécanisme de sélection d'arrêt inférieur.
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ININ/PCT/2002/847/CHEThis application is not viewable in PATENTSCOPE because the national phase entry has not been published yet or the national entry is issued from a country that does not share data with WIPO or there is a formatting issue or an unavailability of the application.
MXPA/a/2002/005693
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