EP1268069A1 - Liquid sample pipette with detachable ejector - Google Patents

Liquid sample pipette with detachable ejector

Info

Publication number
EP1268069A1
EP1268069A1 EP01923761A EP01923761A EP1268069A1 EP 1268069 A1 EP1268069 A1 EP 1268069A1 EP 01923761 A EP01923761 A EP 01923761A EP 01923761 A EP01923761 A EP 01923761A EP 1268069 A1 EP1268069 A1 EP 1268069A1
Authority
EP
European Patent Office
Prior art keywords
pipette
arm
rod
cone
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01923761A
Other languages
German (de)
French (fr)
Other versions
EP1268069B1 (en
Inventor
François VIOT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gilson SAS
Original Assignee
Gilson Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gilson Inc filed Critical Gilson Inc
Publication of EP1268069A1 publication Critical patent/EP1268069A1/en
Application granted granted Critical
Publication of EP1268069B1 publication Critical patent/EP1268069B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/0275—Interchangeable or disposable dispensing tips
    • B01L3/0279—Interchangeable or disposable dispensing tips co-operating with positive ejection means

Definitions

  • the invention relates to pipettes for taking liquid samples.
  • a sampling pipette capable of receiving at its lower end a disposable cone fixed frictionally with the pipette.
  • the pipette comprises an elector which can be actuated by means of a button adjacent to a sampling button. Pushing the button pushes the cone in the opposite direction to the pipette when you want to change this usage cone for a new cone.
  • the ejector comprises an arm having a lower part intended to come into direct contact with the cone and an upper part to which the lower part is fixed by friction fitting in the longitudinal direction of the pipette.
  • This fitting makes it possible to assemble the lower part of the ejector on the pipette quickly and easily and to dismantle it with the same advantages.
  • the ejector follows the cone and its speed increases suddenly. The movement of the ejector is then suddenly stopped because the upper part abuts on the pipette body. The same braking stress is transmitted to the lower part, at the level of the friction fitting.
  • this solicitation goes against this fitting and tends to separate the lower and upper parts from one another. After a certain number cone ejections, it can therefore happen that the lower part of the ejector separates from the pipette in an untimely manner.
  • Document O96 / 37302 provides in the embodiment of FIG. 19 an ejector, the lower part of which intended to push the cone is fitted in the longitudinal direction of the pipette in an upper part of the ejector.
  • a fixing tab keeps the two parts connected to each other avoiding their untimely separation.
  • disassembly of the lower part requires reaching the tongue and is quite inconvenient.
  • An object of the invention is to provide a pipette of a different type avoiding untimely separation of the lower part of the ejector but whose ejector remains easy to dismantle.
  • a sampling pipette comprising a body and an arm movable relative to the body for ejecting in a longitudinal direction from the pipette a cone fixed to the pipette, the arm comprising a first part able to come into contact with the cone and a second part, in which the two parts are fitted one inside the other allowing the first part to be separated from the body from an operating position by an initial movement in a direction essentially perpendicular to the longitudinal direction.
  • the pipette is arranged so that the fitting direction is lateral; - the pipette is arranged so that the fitting direction is unique;
  • one of the arm parts has a “T” shape capable of being received in a housing of the other part of corresponding shape;
  • the pipette is arranged so that the two parts can be separated from each other without first disassembling the pipette;
  • the pipette body forms an obstacle to the separation of the two parts at least when the arm extends at a high end of the ejection stroke;
  • FIG. 2 is a partial view in axial section of the pipette showing the location of the mechanism of Figure 1;
  • FIGS. 3 and 4 are two perspective views of the actuator of the mechanism of Figure 1;
  • FIG. 5 is a partial view in axial section along the plane V-V of the actuator of Figure 3;
  • FIG. 5A is an axial sectional view along the plane A-A of the actuator of Figure 5;
  • FIG. 6 and 7 are two rear and left views of the connecting screw of the mechanism of Figure 1;
  • - Figures 8 and 9 are two cross-sectional views along the planes VIII-VIII and IX-IX of the screw of Figure 7;
  • FIGS. 10 and 11 are two perspective views in axial section of the ejector rod of the mechanism of Figure 1;
  • FIG. 12 is a top view of the ejector rod of Figure 10.
  • FIG. 13 is a diagram showing the placement of the ejector rod on the pipette.
  • the sampling pipette according to the present embodiment of the invention is of the same type as that of document FR-2 696 110. Reference will therefore be made to this document for certain details of the pipette already known from this document. Only certain aspects of the cone ejector mechanism will be described here in detail.
  • the pipette 2 conventionally comprises a body 2 serving as a grip handle by the user's hand.
  • the pipette comprises a movable piston 6 sliding along a longitudinal axis 10 of the pipette in a lower cavity of the pipette in order to draw therein a volume of liquid to be withdrawn or to expel it from this cavity.
  • the displacement of the piston is controlled in particular by means of an axis control rod 10 connected in the lower part to the piston by parts of a known type.
  • This rod is surmounted at its upper end by a push button rigidly fixed to the rod, which the user can operate with the thumb of the hand holding the pipette.
  • the piston lowers and goes up according to the same movement of the button.
  • the pipette includes a return spring capable of replacing the piston and the rod in the upper part at the end of their downward stroke for expelling the liquid, and a purge spring adding its effect to that of the previous spring when the stroke piston continues down for a purge stroke.
  • the pipette has a lower tip 7 capable of receiving, as is well known, a disposable sampling cone 9 frictionally attached to the outside of the lower tip.
  • the pipette includes a cone ejector mechanism illustrated in FIGS. 1 and 2.
  • This mechanism comprises, from top to bottom in the longitudinal direction of the pipette, a control button 12, an actuator 14, a connecting screw, 16, a knurl 18 and an ejector rod 20.
  • the ejector mechanism of FIG. 1 extends in the rear part of the pipette, that is to say on the side of the palm of the user's hand.
  • the actuator 14 has a general shape elongated from top to bottom, tapering towards the bottom. It is housed in the body 2 of the pipette while being movable to slide in the latter along the axis 10.
  • the pipette is arranged so that a downward pressure on the button 12 causes the actuator 14 to descend.
  • the connection between the button and the actuator can be of a type known per se and will not be described here.
  • a return spring 20, illustrated in FIG. 2 ensures the raising of the actuator 14 when the stress on the button 12 ceases.
  • the actuator 14 has a lower end formed by a female attachment part 22.
  • This part is profiled in a direction parallel to the axis 10 and has a shaped cross section. general of "U”, more precisely in the form of an ellipse portion, the two branches 24 of the "U” moving closer to each of their two ends.
  • the opening 26 of the "U” is directed laterally, here towards the left side of the pipette.
  • the lower edge of the attachment part 22 has a shoulder forming a step 28 extending radially projecting towards the inside of the "U”. This shoulder, however, also has a "U" shape.
  • Each branch 24 is separated from the rest of the actuator by a horizontal notch 30 extending from a point located approximately half the length of the branch to its free end.
  • the attachment part forms a cavity 32 between the branches 24.
  • the connecting screw 16 has an upper head 34.
  • the head 34 comprises a support 36 in the general shape of a rectangular parallelepiped and a male attachment part 38 able to penetrate into the female attachment part 22 of the actuator.
  • the male attachment part 38 has a profiled shape parallel to the axis 10 and presents transversely to this axis a generally elliptical shape.
  • the connecting screw 16 has a core 40 from which the support 36 extends upwards, being offset laterally relative to the latter.
  • the male part 38 has a height less than that of the support 36.
  • the upper ends of the male part 38 and of the support 36 are at the same level but the male part extends away from the core 40, to allow passage between them of the step 28.
  • the male part 38 extends to the right projecting from the support 36, and likewise towards the front and the rear. It has a T-shaped profile in view of left and right.
  • the male part 38 is able to be received by fitting into the female part 22 in a lateral direction perpendicular to the axis 10.
  • the branches 24 move apart then come closer, producing a click indicating the arrival of the male part in the receiving position
  • the bending of the branches is allowed by the notches 30 and the material used which is here a thermoplastic material.
  • the step 28 is placed between the male part 38 and the core 40.
  • the connecting screw 16 is thus rigidly fixed to the actuator 14. This fixing is removable.
  • the assembly and disassembly are carried out by a movement in translation of the screw relative to the actuator in a left-right lateral direction.
  • the core 40 of the connecting screw comprises a flattened upper plate 42 and a thin lower part 44 with an essentially rectangular profile.
  • the ejector rod 20 has an elongated shape in the vertical direction. It has an essentially hollow and open transverse profile. However, this profile is closed at the lower end 48 of the rod to form a threaded sliding ring on a lower end piece 50 of the body 2 forming the free end 7 as illustrated in FIG. 2. This ring is able to come in direct contact with the cone in order to eject it.
  • the rod 20 has an essentially non-rectilinear shape to form the junction between this lower end 48 extending in the axis 10 of the pipette and the rear part of the pipette in the upper part of the rod off-axis with respect to the axis 10.
  • the rod has an upper vertical duct 52 with a rectangular transverse profile extending from an upper face 54 of the rod to a notch 56 extending the rod horizontally from its rear face to its front side.
  • the rod has a lower duct 58 coaxial with the upper duct 52, but this time with a circular transverse profile.
  • the diameter of the lower duct 58 is equal to the width of the profile of the upper duct 52, as is the diameter of the threaded rod 46 of the screw 16 is equal to the width of the lower part 44 of the support.
  • the wheel 18 has in its center a threaded conduit to form a screw-nut connection with the rod 46 of the screw 16.
  • the knob 18 extends in the notch 56, coaxially with the conduits 52, 58.
  • the screw 16 enters the two conduits and the knurl.
  • the male part 38 extends projecting from the upper face 54, the rectangular part 44 of the support housed in the upper duct 52 blocks the rod 20 to rotate relative to the screw but allows their relative sliding.
  • the knob 18 forms a screw-nut connection with the rod 46 of the screw.
  • the lower part of the latter is slidably received in the lower conduit 58.
  • the rod 20 is therefore connected to the pipette on the one hand by the connecting screw 16 and on the other hand by the ring 48 threaded on the nozzle. .
  • the knob 18 is directly accessible by the user behind the pipette through the notch.
  • the rotation of the wheel causes the rod 20 to rise or fall by sliding with respect to the body 2 parallel to the axis 10, in order to adjust its position according to the type of disposable cone used.
  • the button 12 is lowered until the rod 20 is placed at the bottom end of the stroke, which pushes the cone down and detaches it from the pipette.
  • the male 38 and female 22 parts are housed in the body 2 of the pipette and inaccessible to the user. Moreover, they are protected from shocks and dirt. The rod 20 cannot be removed in this position.
  • the button 12 is lowered to place the rod at the bottom end of the stroke.
  • the male and female parts then appear.
  • the rod 20 is then urged laterally to separate the male and female parts as mentioned above and as illustrated in FIG. 13. This produces an inclination of the rod 20 relative to the body of the pipette, inclination allowed by the eu at ring 48.
  • slide the lower part of the rod downwards to disengage it from the pipette.
  • Reassembly is carried out by following the reverse operations. The assembly of the rod 20 and the disassembly are done without effort, unlike the longitudinal connection by friction known from the prior art.
  • the rod 20, the knob 18 and the screw 16 constitute a first part of the ejector arm capable of being fitted laterally in the second part of the arm formed by the actuator.
  • the rod 20 cannot be separated from the actuator 14 by sliding parallel to the axis 10. Separation by relative lateral movement is necessary beforehand. No untimely separation is therefore to be feared when ejecting a cone.
  • the wheel 18 allows adjustment of the length of the ejector arm, formed by the actuator 14 and the rod 20, from a continuous range of length values.
  • the characteristics relating to the adjustment of the length of the arm can be implemented from a continuous range of values independently of those relating to the two parts of arm fitted into one another and removable in a direction perpendicular to the longitudinal direction.

Landscapes

  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)

Abstract

The sampling pipette comprises a body and an arm movable relative to the body to eject a cone fixed to the pipette, ejection taking place in a longitudinal direction of the pipette, the arm having both a first portion suitable for coming into contact with the cone, and a second portion. The two portions are engaged one in the other and, starting from an operating position, they enable the first portion to be separated from the body by means of an initial movement in a direction that is essentially perpendicular to the longitudinal direction.

Description

«Pipette de prélèvement d ' échantillons liquides à éjecteur démontable » "Liquid sample pipette with removable ejector"
L'invention concerne les pipettes de prélèvement d'échantillons liquides. On connaît, par exemple du document FR-2 696 110, une pipette de prélèvement apte a recevoir a son extrémité inférieure un cône jetable fixe a friction a la pipette. La pipette comporte un électeur actionnable au moyen d'un bouton voisin d'un bouton de prélèvement. Une poussée sur le bouton permet de pousser le cône en direction opposée a la pipette lorsqu'on souhaite changer ce cône usage pour un cône neuf.The invention relates to pipettes for taking liquid samples. Is known, for example from document FR-2 696 110, a sampling pipette capable of receiving at its lower end a disposable cone fixed frictionally with the pipette. The pipette comprises an elector which can be actuated by means of a button adjacent to a sampling button. Pushing the button pushes the cone in the opposite direction to the pipette when you want to change this usage cone for a new cone.
Dans cette pipette, l'ejecteur comporte un bras ayant une partie inférieure destinée a venir en contact direct avec le cône et une partie supérieure a laquelle la partie inférieure est fixée par emmanchement a friction suivant la direction longitudinale de la pipette. Cet emmanchement permet d'assembler la partie inférieure de l'ejecteur sur la pipette de façon simple et rapide et de la démonter avec les mêmes avantages. Toutefois, lors de l'éjection d'un cône, au moment ou le cône cède et se détache de la pointe de la pipette, l'ejecteur suit le cône et sa vitesse augmente brusquement. Le mouvement de l'ejecteur est ensuite brutalement stoppe du fait que la partie supérieure vient en butée sur le corps de pipette. La même sollicitation en freinage est transmise a la partie inférieure, au niveau de l'emmanchement à friction. Or, cette sollicitation va a l' encontre de cet emmanchement et tend a séparer les parties inférieure et supérieure l'une de l'autre. A l'issue d'un certain nombre d'éjections de cône, il peut donc arriver que la partie inférieure de l'ejecteur se sépare de la pipette de façon intempestive.In this pipette, the ejector comprises an arm having a lower part intended to come into direct contact with the cone and an upper part to which the lower part is fixed by friction fitting in the longitudinal direction of the pipette. This fitting makes it possible to assemble the lower part of the ejector on the pipette quickly and easily and to dismantle it with the same advantages. However, during the ejection of a cone, when the cone yields and detaches from the tip of the pipette, the ejector follows the cone and its speed increases suddenly. The movement of the ejector is then suddenly stopped because the upper part abuts on the pipette body. The same braking stress is transmitted to the lower part, at the level of the friction fitting. However, this solicitation goes against this fitting and tends to separate the lower and upper parts from one another. After a certain number cone ejections, it can therefore happen that the lower part of the ejector separates from the pipette in an untimely manner.
Le document O96/37302 prévoit dans le mode de réalisation de la figure 19 un ejecteur dont la partie inférieure destinée à pousser le cône est emmanchée suivant la direction longitudinale de la pipette dans une partie supérieure de l'ejecteur. Une languette de fixation maintient les deux parties reliées l'une à l'autre en évitant leur séparation intempestive. Toutefois, le démontage de la partie inférieure nécessite d'atteindre la languette et est assez incommode .Document O96 / 37302 provides in the embodiment of FIG. 19 an ejector, the lower part of which intended to push the cone is fitted in the longitudinal direction of the pipette in an upper part of the ejector. A fixing tab keeps the two parts connected to each other avoiding their untimely separation. However, disassembly of the lower part requires reaching the tongue and is quite inconvenient.
Un but de l'invention est de fournir une pipette d'un type différent évitant la séparation intempestive de la partie basse de l'ejecteur mais dont l'ejecteur demeure facile à démonter.An object of the invention is to provide a pipette of a different type avoiding untimely separation of the lower part of the ejector but whose ejector remains easy to dismantle.
En vue de la réalisation de ce but, on prévoit selon l'invention une pipette de prélèvement comportant un corps et un bras mobile par rapport au corps pour éjecter suivant une direction longitudinale de la pipette un cône fixé à la pipette, le bras comprenant une première partie apte a venir en contact avec le cône et une deuxième partie, dans laquelle les deux parties sont emmanchées l'une dans l'autre en permettant de séparer du corps la première partie a partir d'une position de fonctionnement par un mouvement initial suivant une direction essentiellement perpendiculaire à la direction longitudinale. Ainsi, du fait que le bras comporte encore deux parties assemblées l'une à l'autre, il peut être démonté de façon simple. Cependant, l'invention évite leur séparation intempestive sous l'effet des sollicitations d'éjection. En outre, puisque la liaison par friction n'est plus imperative, on peut prévoir une liaison permettant un montage et un démontage sans effort.With a view to achieving this aim, a sampling pipette is provided according to the invention comprising a body and an arm movable relative to the body for ejecting in a longitudinal direction from the pipette a cone fixed to the pipette, the arm comprising a first part able to come into contact with the cone and a second part, in which the two parts are fitted one inside the other allowing the first part to be separated from the body from an operating position by an initial movement in a direction essentially perpendicular to the longitudinal direction. Thus, because the arm still has two parts assembled to one another, it can be disassembled in a simple manner. However, the invention avoids their untimely separation under the effect of ejection stresses. In addition, since the friction connection is no longer imperative, provision can be made for a connection allowing effortless assembly and disassembly.
L' invention pourra en outre présenter au moins l'une quelconque des caractéristiques suivantes :The invention may also have at least any of the following characteristics:
- la pipette est agencée de sorte que la direction d'emmanchement est latérale ; - la pipette est agencée de sorte que la direction d' emmanchement est unique ;- The pipette is arranged so that the fitting direction is lateral; - the pipette is arranged so that the fitting direction is unique;
- l'une des parties de bras présente une forme en « T » apte a être reçue dans un logement de l'autre partie de forme correspondante ; - la pipette est agencée de sorte que les deux parties peuvent être séparées l'une de l'autre sans démonter au préalable la pipette ;- one of the arm parts has a “T” shape capable of being received in a housing of the other part of corresponding shape; - The pipette is arranged so that the two parts can be separated from each other without first disassembling the pipette;
- le corps de pipette forme obstacle a la séparation des deux parties au moins lorsque le bras s'étend a une extrémité haute de la course d'éjection ;- The pipette body forms an obstacle to the separation of the two parts at least when the arm extends at a high end of the ejection stroke;
- la pipette est agencée de sorte que le corps permet la séparation des deux parties lorsque le bras s'étend a une extrémité basse de la course d'éjection ; la pipette comprend des moyens de réglage permettant de faire varier une longueur du bras continûment dans une plage de valeurs. D'autres caractéristiques et avantages de l'invention apparaîtront encore dans la description suivante d'un mode préfère de réalisation donne a titre d'exemple non limitatif. Aux dessins annexes : - la figure 1 est une vue en perspective du mécanisme d' ejecteur d'une pipette selon un mode préféré de réalisation de l'invention ;- The pipette is arranged so that the body allows the separation of the two parts when the arm extends at a low end of the ejection stroke; the pipette comprises adjustment means making it possible to vary a length of the arm continuously within a range of values. Other characteristics and advantages of the invention will become apparent in the following description of a preferred embodiment given by way of non-limiting example. In the accompanying drawings: - Figure 1 is a perspective view of the ejector mechanism of a pipette according to a preferred embodiment of the invention;
- la figure 2 est une vue partielle en coupe axiale de la pipette montrant l'emplacement du mécanisme de la figure 1 ;- Figure 2 is a partial view in axial section of the pipette showing the location of the mechanism of Figure 1;
- les figures 3 et 4 sont deux vues en perspective de l'actionneur du mécanisme de la figure 1 ;- Figures 3 and 4 are two perspective views of the actuator of the mechanism of Figure 1;
- la figure 5 est une vue partielle en coupe axiale suivant le plan V-V de l'actionneur de la figure 3 ;- Figure 5 is a partial view in axial section along the plane V-V of the actuator of Figure 3;
- la figure 5A est une vue en coupe axiale suivant le plan A-A de l'actionneur de la figure 5 ;- Figure 5A is an axial sectional view along the plane A-A of the actuator of Figure 5;
- les figures 6 et 7 sont deux vues arrière et gauche de la vis de liaison du mécanisme de la figure 1 ; - les figures 8 et 9 sont deux vues en coupe transversale suivant les plans VIII-VIII et IX-IX de la vis de la figure 7 ;- Figures 6 and 7 are two rear and left views of the connecting screw of the mechanism of Figure 1; - Figures 8 and 9 are two cross-sectional views along the planes VIII-VIII and IX-IX of the screw of Figure 7;
- les figures 10 et 11 sont deux vues en perspective et en coupe axiale de la tige d' ejecteur du mécanisme de la figure 1 ;- Figures 10 and 11 are two perspective views in axial section of the ejector rod of the mechanism of Figure 1;
- la figure 12 est une vue de dessus de la tige d' ejecteur de la figure 10 ; et- Figure 12 is a top view of the ejector rod of Figure 10; and
- la figure 13 est un schéma montrant la mise en place de la tige d' ejecteur sur la pipette. La pipette de prélèvement selon le présent mode de réalisation de l'invention est du même type que celle du document FR-2 696 110. On se référera donc à ce document pour certains détails de la pipette déjà connus de ce document. On ne décrira ici en détail que certains aspects du mécanisme d' ejecteur de cône.- Figure 13 is a diagram showing the placement of the ejector rod on the pipette. The sampling pipette according to the present embodiment of the invention is of the same type as that of document FR-2 696 110. Reference will therefore be made to this document for certain details of the pipette already known from this document. Only certain aspects of the cone ejector mechanism will be described here in detail.
En référence à la figure 2, la pipette 2 comprend classiquement un corps 2 servant de poignée à saisir par la main de l'utilisateur. La pipette comporte un piston 6 mobile à coulissement suivant un axe longitudinal 10 de la pipette dans une cavité inférieure de la pipette afin d'aspirer dans celle-ci un volume de liquide à prélever ou de l'expulser hors de cette cavité. Le déplacement du piston est commandé notamment au moyen d'une tige de commande d'axe 10 reliée en partie inférieure au piston par des pièces d'un type connu. Cette tige est surmontée à son extrémité supérieure par un bouton poussoir rigidement fixé à la tige, que l'utilisateur peut actionner avec le pouce de la main tenant la pipette. Ainsi le piston s'abaisse et remonte en fonction du même mouvement du bouton. La pipette comporte un ressort de rappel apte à replacer le piston et la tige en partie haute à la fin de leur course vers le bas pour l'expulsion du liquide, et un ressort de purge ajoutant son effet à celui du précédent ressort lorsque la course du piston se poursuit vers le bas pour une course de purge. La pipette comporte une pointe inférieure 7 apte à recevoir comme il est bien connu un cône de prélèvement jetable 9 fixé à friction extérieurement à la pointe inférieure .Referring to Figure 2, the pipette 2 conventionally comprises a body 2 serving as a grip handle by the user's hand. The pipette comprises a movable piston 6 sliding along a longitudinal axis 10 of the pipette in a lower cavity of the pipette in order to draw therein a volume of liquid to be withdrawn or to expel it from this cavity. The displacement of the piston is controlled in particular by means of an axis control rod 10 connected in the lower part to the piston by parts of a known type. This rod is surmounted at its upper end by a push button rigidly fixed to the rod, which the user can operate with the thumb of the hand holding the pipette. Thus the piston lowers and goes up according to the same movement of the button. The pipette includes a return spring capable of replacing the piston and the rod in the upper part at the end of their downward stroke for expelling the liquid, and a purge spring adding its effect to that of the previous spring when the stroke piston continues down for a purge stroke. The pipette has a lower tip 7 capable of receiving, as is well known, a disposable sampling cone 9 frictionally attached to the outside of the lower tip.
La pipette comporte un mécanisme d' ejecteur de cône illustré aux figures 1 et 2. Ce mécanisme comprend de haut en bas suivant la direction longitudinale de la pipette un bouton de commande 12, un actionneur 14, une vis de liaison, 16, une mollette 18 et une tige d'éjecteur 20. Le mécanisme d'éjecteur de la figure 1 s'étend en partie arrière de la pipette, c'est-à-dire du côté de la paume de la main de l'utilisateur. L'actionneur 14 a une forme générale allongée de haut en bas, allant en se rétrécissant vers le bas. Il est logé dans le corps 2 de la pipette en étant mobile à coulissement dans celui-ci suivant l'axe 10. La pipette est agencée de sorte qu'une pression vers le bas sur le bouton 12 provoque la descente de l'actionneur 14. La liaison entre le bouton et l'actionneur peut être d'un type connu en soi et ne sera pas décrite ici. Un ressort de rappel 20, illustre à la figure 2, assure la remontée de l'actionneur 14 lorsque cesse la sollicitation sur le bouton 12.The pipette includes a cone ejector mechanism illustrated in FIGS. 1 and 2. This mechanism comprises, from top to bottom in the longitudinal direction of the pipette, a control button 12, an actuator 14, a connecting screw, 16, a knurl 18 and an ejector rod 20. The ejector mechanism of FIG. 1 extends in the rear part of the pipette, that is to say on the side of the palm of the user's hand. The actuator 14 has a general shape elongated from top to bottom, tapering towards the bottom. It is housed in the body 2 of the pipette while being movable to slide in the latter along the axis 10. The pipette is arranged so that a downward pressure on the button 12 causes the actuator 14 to descend. The connection between the button and the actuator can be of a type known per se and will not be described here. A return spring 20, illustrated in FIG. 2, ensures the raising of the actuator 14 when the stress on the button 12 ceases.
En référence aux figures 3, 4, 5 et 5A, l'actionneur 14 présente une extrémité inférieure formée par une partie d'attache femelle 22. Cette partie est profilée suivant une direction parallèle a l'axe 10 et a une section transversale en forme générale de « U », plus précisément en forme de portion d'ellipse, les deux branches 24 du « U » allant en se rapprochant à chacune de leurs deux extrémités. L'ouverture 26 du « U » est dirigée latéralement, ici vers le côte gauche de la pipette. Le bord inférieur de la partie d' attache 22 comporte un epaulement formant une marche 28 s' étendant radialement en saillie vers l'intérieur du « U ». Cet epaulement a néanmoins lui aussi une forme en « U ». Chaque branche 24 est séparée du reste de l'actionneur par une échancrure horizontale 30 s' étendant depuis un point situe environ a la moitié de la longueur de la branche jusqu'à son extrémité libre. La partie d'attache forme une cavité 32 entre les branches 24.With reference to FIGS. 3, 4, 5 and 5A, the actuator 14 has a lower end formed by a female attachment part 22. This part is profiled in a direction parallel to the axis 10 and has a shaped cross section. general of "U", more precisely in the form of an ellipse portion, the two branches 24 of the "U" moving closer to each of their two ends. The opening 26 of the "U" is directed laterally, here towards the left side of the pipette. The lower edge of the attachment part 22 has a shoulder forming a step 28 extending radially projecting towards the inside of the "U". This shoulder, however, also has a "U" shape. Each branch 24 is separated from the rest of the actuator by a horizontal notch 30 extending from a point located approximately half the length of the branch to its free end. The attachment part forms a cavity 32 between the branches 24.
En référence aux figures 6 a 9, la vis de liaison 16 comporte une tête supérieure 34. La tête 34 comprend un support 36 en forme générale de parallélépipède rectangle et une partie d'attache mâle 38 apte a pénétrer dans la partie d'attache femelle 22 de l'actionneur. A cette fin, la partie d'attache mâle 38 a une forme profilée parallèlement a l'axe 10 et présente transversalement a cet axe une forme générale elliptique. La vis de liaison 16 comporte un noyau 40 a partir duquel s'étend vers le haut le support 36, en étant décalé latéralement par rapport a ce dernier. La partie mâle 38 a une hauteur inférieure a celle du support 36. Les extrémités supérieures de la partie mâle 38 et du support 36 sont au même niveau mais la partie mâle s'étend a distance du noyau 40, pour permettre le passage entre eux de la marche 28. La partie mâle 38 s'étend vers la droite en saillie du support 36, et de même vers l'avant et l'arriére. Elle a en vue de gauche et de droite un profil en « T ».Referring to Figures 6 to 9, the connecting screw 16 has an upper head 34. The head 34 comprises a support 36 in the general shape of a rectangular parallelepiped and a male attachment part 38 able to penetrate into the female attachment part 22 of the actuator. To this end, the male attachment part 38 has a profiled shape parallel to the axis 10 and presents transversely to this axis a generally elliptical shape. The connecting screw 16 has a core 40 from which the support 36 extends upwards, being offset laterally relative to the latter. The male part 38 has a height less than that of the support 36. The upper ends of the male part 38 and of the support 36 are at the same level but the male part extends away from the core 40, to allow passage between them of the step 28. The male part 38 extends to the right projecting from the support 36, and likewise towards the front and the rear. It has a T-shaped profile in view of left and right.
La partie mâle 38 est apte a être reçue par emmanchement dans la partie femelle 22 suivant une direction latérale perpendiculaire a l'axe 10. Lors de l'introduction, les branches 24 s'écartent puis se rapprochent, produisant un clic indiquant l'arrivée de la partie mâle en position de réception Le fléchissement des branches est permis par les échancrures 30 et le matériau utilise qui est ici une matière thermoplastique. La marche 28 vient se placer entre la partie mâle 38 et le noyau 40. La vis de liaison 16 se trouve ainsi rigidement fixée a l'actionneur 14. Cette fixation est démontable Le montage et le démontage se font par un mouvement en translation de la vis par rapport a l'actionneur suivant une direction latérale gauche-droite. Le noyau 40 de la vis de liaison comprend un plateau supérieur aplati 42 et une partie inférieure mince 44 à profil essentiellement rectangulaire. Il est prolongé en partie inférieure par une tige filetée 46. En référence aux figures 10 à 12, la tige d'éjecteur 20 a une forme allongée suivant la direction verticale. Elle présente un profil transversal essentiellement creux et ouvert. Toutefois, ce profil est fermé à l'extrémité inférieure 48 de la tige pour former une bague enfilée a coulissement sur un embout inférieur 50 du corps 2 formant l'extrémité libre 7 comme illustre à la figure 2. Cette bague est apte a venir en contact direct avec le cône en vue de l'éjecter. De plus, la tige 20 a une forme essentiellement non rectiligne pour former la jonction entre cette extrémité inférieure 48 s' étendant dans l'axe 10 de la pipette et la partie arrière de la pipette en partie supérieure de la tige désaxée par rapport a l'axe 10. A cette partie supérieure, la tige présente un conduit vertical supérieur 52 a profil transversal rectangulaire s' étendant d'une face supérieure 54 de la tige jusqu'à une échancrure 56 entamant la tige horizontalement depuis sa face arrière jusqu'à sa face avant. Au-dessous de l' échancrure, la tige présente un conduit inférieur 58 coaxial au conduit supérieur 52, mais cette fois à profil transversal circulaire. Le diamètre du conduit inférieur 58 est égal a la largeur du profil du conduit supérieur 52, de même que le diamètre de la tige filetée 46 de la vis 16 est égal a la largeur de la partie inférieure 44 du support. La mollette 18 présente en son centre un conduit fileté pour former une liaison vis-ecrou avec la tige 46 de la vis 16.The male part 38 is able to be received by fitting into the female part 22 in a lateral direction perpendicular to the axis 10. During the introduction, the branches 24 move apart then come closer, producing a click indicating the arrival of the male part in the receiving position The bending of the branches is allowed by the notches 30 and the material used which is here a thermoplastic material. The step 28 is placed between the male part 38 and the core 40. The connecting screw 16 is thus rigidly fixed to the actuator 14. This fixing is removable. The assembly and disassembly are carried out by a movement in translation of the screw relative to the actuator in a left-right lateral direction. The core 40 of the connecting screw comprises a flattened upper plate 42 and a thin lower part 44 with an essentially rectangular profile. It is extended in the lower part by a threaded rod 46. With reference to FIGS. 10 to 12, the ejector rod 20 has an elongated shape in the vertical direction. It has an essentially hollow and open transverse profile. However, this profile is closed at the lower end 48 of the rod to form a threaded sliding ring on a lower end piece 50 of the body 2 forming the free end 7 as illustrated in FIG. 2. This ring is able to come in direct contact with the cone in order to eject it. In addition, the rod 20 has an essentially non-rectilinear shape to form the junction between this lower end 48 extending in the axis 10 of the pipette and the rear part of the pipette in the upper part of the rod off-axis with respect to the axis 10. At this upper part, the rod has an upper vertical duct 52 with a rectangular transverse profile extending from an upper face 54 of the rod to a notch 56 extending the rod horizontally from its rear face to its front side. Below the notch, the rod has a lower duct 58 coaxial with the upper duct 52, but this time with a circular transverse profile. The diameter of the lower duct 58 is equal to the width of the profile of the upper duct 52, as is the diameter of the threaded rod 46 of the screw 16 is equal to the width of the lower part 44 of the support. The wheel 18 has in its center a threaded conduit to form a screw-nut connection with the rod 46 of the screw 16.
La mollette 18 s'étend dans l'echancrure 56, coaxialement aux conduits 52, 58. La vis 16 pénètre dans les deux conduits et dans la mollette. La partie mâle 38 s'étend en saillie de la face supérieure 54, la partie rectangulaire 44 du support logée dans le conduit supérieur 52 bloque la tige 20 a rotation par rapport a la vis mais autorise leur coulissement relatif. La mollette 18 forme une liaison vis-ecrou avec la tige 46 de la vis. La partie inférieure de celle-ci est reçue a coulissement dans le conduit inférieur 58. La tige 20 est donc reliée a la pipette d'une part par la vis de liaison 16 et d'autre part par la bague 48 enfilée sur l'embout.The knob 18 extends in the notch 56, coaxially with the conduits 52, 58. The screw 16 enters the two conduits and the knurl. The male part 38 extends projecting from the upper face 54, the rectangular part 44 of the support housed in the upper duct 52 blocks the rod 20 to rotate relative to the screw but allows their relative sliding. The knob 18 forms a screw-nut connection with the rod 46 of the screw. The lower part of the latter is slidably received in the lower conduit 58. The rod 20 is therefore connected to the pipette on the one hand by the connecting screw 16 and on the other hand by the ring 48 threaded on the nozzle. .
La mollette 18 est directement accessible par l'utilisateur en arrière de la pipette a travers l'echancrure. La rotation de la mollette entraîne la montée ou la descente a coulissement de la tige 20 par rapport au corps 2 parallèlement a l'axe 10, afin de régler sa positon en fonction du type de cône jetable utilise .The knob 18 is directly accessible by the user behind the pipette through the notch. The rotation of the wheel causes the rod 20 to rise or fall by sliding with respect to the body 2 parallel to the axis 10, in order to adjust its position according to the type of disposable cone used.
Pour éjecter le cône, on abaisse le bouton 12 jusqu'à placer la tige 20 en fin de course basse, ce qui pousse le cône vers le bas et le détache de la pipette .To eject the cone, the button 12 is lowered until the rod 20 is placed at the bottom end of the stroke, which pushes the cone down and detaches it from the pipette.
Lorsque le mécanisme d'éjecteur est au repos, c' est-a-dire en fin de course haute, les parties mâle 38 et femelle 22 sont logées dans le corps 2 de la pipette et inaccessibles a l'utilisateur. De plus, elles y sont protégées des chocs et des salissures. La tige 20 ne peut pas être démontée dans cette position.When the ejector mechanism is at rest, that is to say at the top end of travel, the male 38 and female 22 parts are housed in the body 2 of the pipette and inaccessible to the user. Moreover, they are protected from shocks and dirt. The rod 20 cannot be removed in this position.
Pour démonter la tige 20 et la séparer de la pipette, on abaisse le bouton 12 pour placer la tige en fin de course basse. Les parties mâle et femelle apparaissent alors. On sollicite alors la tige 20 latéralement pour séparer les parties mâle et femelle comme précité et tel qu'illustre a la figure 13. Cela produit une inclinaison de la tige 20 par rapport au corps de la pipette, inclinaison permise par le eu au niveau de la bague 48. On fait ensuite coulisser la partie inférieure de la tige vers le bas pour la desengager de la pipette. Le remontage est effectue en suivant les opérations inverses. Le montage de la tige 20 et le démontage se font sans effort, contrairement a la liaison longitudinale par friction connue de l'art antérieur .To disassemble the rod 20 and separate it from the pipette, the button 12 is lowered to place the rod at the bottom end of the stroke. The male and female parts then appear. The rod 20 is then urged laterally to separate the male and female parts as mentioned above and as illustrated in FIG. 13. This produces an inclination of the rod 20 relative to the body of the pipette, inclination allowed by the eu at ring 48. Then slide the lower part of the rod downwards to disengage it from the pipette. Reassembly is carried out by following the reverse operations. The assembly of the rod 20 and the disassembly are done without effort, unlike the longitudinal connection by friction known from the prior art.
On voit ainsi que la tige 20, la mollette 18 et la vis 16 constituent une première partie de bras d'éjecteur apte à être emmanchée latéralement dans la deuxième partie de bras formée par l'actionneur.It can thus be seen that the rod 20, the knob 18 and the screw 16 constitute a first part of the ejector arm capable of being fitted laterally in the second part of the arm formed by the actuator.
On remarquera que le démontage de la tiqe peut aussi ici avoir lieu en tournant la mollette jusqu'à la desengager de la vis de liaison 16. Mais cette procédure entraîne la séparation de la tige 20, de la vis 16 et de la mollette 18 les unes des autres, alors que la procédure précédemment décrite conserve ces trois pièces reliées entre elles.It will be noted that the dismantling of the head can also take place here by turning the knob until disengaging it from the connecting screw 16. But this procedure involves the separation of the rod 20, of the screw 16 and of the knob 18. each other, while the procedure described above keeps these three parts connected to each other.
Grâce a la marche 28, la tige 20 ne peut pas être séparée de l'actionneur 14 par un coulissement parallèlement a l'axe 10. Une séparation par un mouvement latéral relatif est nécessaire au préalable. Aucune séparation intempestive n'est donc à craindre lors de l'éjection d'un cône.Thanks to the step 28, the rod 20 cannot be separated from the actuator 14 by sliding parallel to the axis 10. Separation by relative lateral movement is necessary beforehand. No untimely separation is therefore to be feared when ejecting a cone.
La mollette 18 permet un réglage de la longueur du bras d'éjecteur, formé par l'actionneur 14 et la tige 20, parmi une plage continue de valeurs de longueur.The wheel 18 allows adjustment of the length of the ejector arm, formed by the actuator 14 and the rod 20, from a continuous range of length values.
Bien entendu, on pourra apporter à l'invention de nombreuses modifications sans sortir du cadre de celle- ci .Of course, many modifications can be made to the invention without departing from the scope thereof.
On pourra par exemple relier la tige 20 à l'actionneur 14 par d'autres types de liaisons formant obstacle au coulissement relatif des pièces de l'ejecteur, par exemple une ou plusieurs liaisons vis- écrou ou une liaison par baïonnettes.We can for example connect the rod 20 to the actuator 14 by other types of connections forming an obstacle to the relative sliding of the parts of the ejector, for example one or more screw-nut connections or a bayonet connection.
On pourra mettre en œuvre les caractéristiques relatives au réglage de la longueur du bras parmi une plage continue de valeurs indépendamment de celles relatives aux deux parties de bras emmanchées l'une dans l'autre et démontables suivant une direction perpendiculaire à la direction longitudinale. The characteristics relating to the adjustment of the length of the arm can be implemented from a continuous range of values independently of those relating to the two parts of arm fitted into one another and removable in a direction perpendicular to the longitudinal direction.

Claims

REVENDICATIONS
1. Pipette de prélèvement comportant un corps (2) et un bras mobile par rapport au corps pour éjecter suivant une direction longitudinale (10) de la pipette un cône (9) fixé à la pipette, le bras comprenant une première partie (16, 18, 20) apte à venir en contact avec le cône et une deuxième partie (14), caractérisée en ce que les deux parties sont emmanchées l'une dans l'autre en permettant de séparer du corps (2) la première partie à partir d'une position de fonctionnement par un mouvement initial suivant une direction essentiellement perpendiculaire à la direction longitudinale (10). 1. Sampling pipette comprising a body (2) and an arm movable relative to the body for ejecting in a longitudinal direction (10) from the pipette a cone (9) fixed to the pipette, the arm comprising a first part (16, 18, 20) able to come into contact with the cone and a second part (14), characterized in that the two parts are fitted one inside the other making it possible to separate the first part from the body (2) from an operating position by an initial movement in a direction substantially perpendicular to the longitudinal direction (10).
2. Pipette selon la revendication 1, caractérisée en ce qu'elle est agencée de sorte que la direction d'emmanchement est latérale.2. Pipette according to claim 1, characterized in that it is arranged so that the fitting direction is lateral.
3. Pipette selon la revendication 1 ou 2, caractérisée en ce qu'elle est agencée de sorte que la direction d'emmanchement est unique.3. Pipette according to claim 1 or 2, characterized in that it is arranged so that the fitting direction is unique.
4. Pipette selon l'une quelconque des revendications 1 à 3, caractérisée en ce que l'une (20) des parties de bras présente une forme (34) en « T » apte à être reçue dans un logement (32) de l'autre partie (14) de forme correspondante.4. Pipette according to any one of claims 1 to 3, characterized in that one (20) of the arm parts has a shape (34) in "T" shape capable of being received in a housing (32) of the 'other part (14) of corresponding shape.
5. Pipette selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'elle est agencée de sorte que les deux parties peuvent être séparées l'une de l'autre sans démonter au préalable la pipette.5. Pipette according to any one of claims 1 to 4, characterized in that it is arranged so that the two parts can be separated from one another without first disassembling the pipette.
6. Pipette selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le corps (2) de pipette forme obstacle à la séparation des deux parties au moins lorsque le bras s'étend a une extrémité haute de la course d' éjection.6. Pipette according to any one of claims 1 to 5, characterized in that the body (2) pipette forms an obstacle to the separation of the two parts at least when the arm extends at a high end of the ejection stroke.
7. Pipette selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'elle est agencée de sorte que le corps (2) permet la séparation des deux parties lorsque le bras s'étend a une extrémité basse de la course d'éjection.7. Pipette according to any one of claims 1 to 6, characterized in that it is arranged so that the body (2) allows the separation of the two parts when the arm extends at a low end of the stroke d 'ejection.
8. Pipette selon l'une quelconque des revendications 1 a 7, caractérisée en ce qu'elle comprend des moyens de réglage (16, 18), permettant de faire varier une longueur du bras (14, 16, 18, 20) continûment dans une plage de valeurs. 8. Pipette according to any one of claims 1 to 7, characterized in that it comprises adjustment means (16, 18), making it possible to vary a length of the arm (14, 16, 18, 20) continuously in a range of values.
EP01923761A 2000-04-07 2001-04-09 Liquid sample pipette with detachable ejector Expired - Lifetime EP1268069B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0004470A FR2807341B1 (en) 2000-04-07 2000-04-07 PIPETTE FOR COLLECTING LIQUID SAMPLES WITH REMOVABLE EJECTOR
FR0004470 2000-04-07
PCT/FR2001/001071 WO2001076751A1 (en) 2000-04-07 2001-04-09 Liquid sample pipette with detachable ejector

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EP1268069A1 true EP1268069A1 (en) 2003-01-02
EP1268069B1 EP1268069B1 (en) 2008-06-18

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US (2) US6997067B2 (en)
EP (1) EP1268069B1 (en)
JP (1) JP4759204B2 (en)
KR (1) KR100687590B1 (en)
CN (1) CN1210106C (en)
AT (1) ATE398488T1 (en)
AU (2) AU5045401A (en)
CA (1) CA2404742C (en)
DE (1) DE60134462D1 (en)
DK (1) DK1268069T3 (en)
FR (1) FR2807341B1 (en)
MX (1) MXPA02009873A (en)
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WO (1) WO2001076751A1 (en)

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Also Published As

Publication number Publication date
MXPA02009873A (en) 2004-05-05
CA2404742C (en) 2009-02-10
EP1268069B1 (en) 2008-06-18
JP2003530210A (en) 2003-10-14
FR2807341B1 (en) 2002-07-12
FR2807341A1 (en) 2001-10-12
US20050191215A1 (en) 2005-09-01
JP4759204B2 (en) 2011-08-31
US20030159525A1 (en) 2003-08-28
WO2001076751A1 (en) 2001-10-18
CN1210106C (en) 2005-07-13
CN1419478A (en) 2003-05-21
KR100687590B1 (en) 2007-02-28
US6997067B2 (en) 2006-02-14
DK1268069T3 (en) 2008-10-20
AU5045401A (en) 2001-10-23
RU2259880C2 (en) 2005-09-10
DE60134462D1 (en) 2008-07-31
KR20020087953A (en) 2002-11-23
ATE398488T1 (en) 2008-07-15
CA2404742A1 (en) 2002-10-01
AU2001250454B2 (en) 2006-03-02

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