US20050191215A1 - Liquid sample pipette with detachable ejector - Google Patents
Liquid sample pipette with detachable ejector Download PDFInfo
- Publication number
- US20050191215A1 US20050191215A1 US11/115,434 US11543405A US2005191215A1 US 20050191215 A1 US20050191215 A1 US 20050191215A1 US 11543405 A US11543405 A US 11543405A US 2005191215 A1 US2005191215 A1 US 2005191215A1
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- US
- United States
- Prior art keywords
- pipette
- ejector rod
- actuator
- ejector
- sampling pipette
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- 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.)
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- 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 is known, e.g. from document FR 2,696,110, that is suitable for receiving a discardable cone at its bottom end, which cone is held on the pipette by means of friction.
- the pipette has an ejector that can be actuated by means of a button adjacent to a sampling button. Pressing on that button enables the cone to be pushed away from the pipette when it is desired to replace a used cone with a new cone.
- the ejector has an arm with a bottom portion for coming into direct contact with the cone, and a top portion to which the bottom portion is secured by friction engagement in the longitudinal direction of the pipette.
- This engagement enables the bottom portion of the ejector to be assembled simply and quickly onto the pipette and to be removed with the same advantages.
- the ejector follows the cone and its speed increases suddenly. The movement of the ejector is then stopped sharply because the top portion comes into abutment against the body of the pipette. The same braking force is transmitted to the bottom portion via the friction engagement.
- FIG. 19 providing for an ejector in which the bottom portion that pushes against the cone is itself engaged in the longitudinal direction of the pipette in a top portion of the ejector.
- a fixing tongue holds together the two interconnected portions and prevents them from separating in untimely manner. Nevertheless, in order to remove the bottom portion, it is necessary to reach the tongue, and that is rather awkward.
- An object of the invention is to provide a pipette of a different type that avoids untimely separation of the bottom portion of the ejector, but in which the ejector remains easy to remove.
- the invention provides a sampling pipette comprising 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, wherein 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.
- the arm still comprises two portions that are assembled together, it can continue to be removed in simple manner. Nevertheless, the invention prevents the portions separating in untimely manner under the effect of forces that arise during ejection.
- the friction connection is no longer essential, a connection can be provided that is suitable for being assembled and disassembled without applying force.
- FIG. 1 is a perspective view of the ejector mechanism of a pipette constituting a preferred embodiment of the invention
- FIG. 2 is a fragmentary axial section view of the pipette showing the location of the FIG. 1 mechanism
- FIGS. 3 and 4 are two perspective views of the actuator of the FIG. 1 device
- FIG. 5 is a fragmentary axial section view on plane V-V of the FIG. 3 actuator
- FIG. 5A is an axial section view on plane A-A of the FIG. 5 actuator
- FIGS. 6 and 7 are a rear view and a left-hand view of the connection screw of the FIG. 1 mechanism
- FIGS. 8 and 9 are two cross-section views on planes VIII-VIII and IX-IX of the FIG. 7 screw;
- FIGS. 10 and 11 are a perspective view and an axial section view of the ejector rod of the FIG. 1 mechanism
- FIG. 12 is a plan view of the FIG. 10 ejector 5 rod.
- FIG. 13 is a diagram showing how the ejector rod is put into place on the pipette.
- sampling pipette constituting the present invention of the invention is of the same type as that described in document FR-2,696,110. Reference should therefore be made to that document for various details of the pipette already disclosed therein. Only certain aspects of the cone ejector mechanism are described in detail below.
- the pipette conventionally comprises a body 2 serving as a handle for holding in the user's hand.
- the pipette has a piston 6 that is slidably movable along a longitudinal axis 10 of the pipette in a bottom cavity of the pipette in order to suck up a volume of liquid that is to be taken into said cavity, or else to expel it therefrom.
- Displacement of the piston is controlled in particular by means of a control rod on the axis 10 having its bottom portion connected to the piston by parts of known type. At its top end, the rod is surmounted by a pushbutton that is rigidly fixed to the rod and that the user can actuate with the thumb of the hand holding the pipette.
- the piston thus moves down and up as a function of the same movement of the button.
- the pipette includes a return spring suitable for returning the piston and the rod to the high position at the end of their down stroke for expelling liquid, and a purge spring whose effect is added to that of the preceding spring when the stroke of the piston is continued downwards for a purge stroke.
- the pipette has a bottom tip 7 suitable for receiving a discardable sampling cone 9 in conventional manner, which cone is held by friction acting on the outside of the bottom tip.
- the pipette has a cone ejector mechanism as shown in FIGS. 1 and 2 .
- This mechanism comprises, going downwards along the longitudinal direction of the pipette: a control button 12 ; an actuator 14 ; a connection screw 16 ; a knurled wheel 18 ; and an ejector rod 20 .
- the FIG. 1 ejector mechanism extends over the rear portion of the pipette, i.e. the portion beside the palm of the user's hand.
- the actuator 14 is generally elongate in shape in a downward direction and it tapers downwards. It is received in the body 2 of the pipette so as to be slidably movable therein along the axis 10 .
- the pipette is arranged in such a manner that downward pressure on the button 12 causes the actuator 14 to move down.
- the connection between the button and the actuator can be of conventional type and is not described herein.
- a return spring 19 shown in FIG. 2 serves to raise the actuator 14 when force is no longer applied to the button 12 .
- the actuator 14 presents a bottom end formed by a female coupling portion 22 .
- This portion is shaped in a direction parallel to the axis 10 and has a generally U-shaped cross-section, and more precisely a cross-section in the form of a portion of an ellipse with both limbs 24 of the U-shape extending towards each other at both ends.
- the opening 26 of the U-shape faces sideways, in this case towards the left-hand side of the pipette.
- the bottom edge of the coupling portion 22 has a shoulder forming a step 28 projecting radially towards the inside of the U-shape. Nevertheless, this shoulder is also U-shaped.
- Each limb 24 is separated from the remainder of the actuator by a horizontal notch 30 extending from a point situated about halfway along the length of the branch to the free end thereof.
- the coupling portion forms a cavity 32 between the limbs 24 .
- connection screw 16 has a top head 34 .
- the head 34 includes a support 36 generally in the form of a rectangular parallelepiped and a male coupling portion 38 suitable for penetrating into the female coupling portion 22 of the actuator.
- the male coupling portion 38 is of constant section parallel to the axis 10 , while transversely to said axis it is generally of elliptical shape.
- the connection screw 16 has a core 40 from which the support 36 projects upwards, being offset laterally relative thereto. The height of the male portion 38 is less than the height of the support 36 .
- the top ends of the male portion 38 and of the support 36 are at the same level, but the male portion lies at a distance from the core 40 so as to enable the step 28 to pass between them.
- the male portion 38 extends towards the right, projecting from the support 36 , and also towards the front and towards the rear. Seen from the left and from the right it presents a T-shaped profile.
- the male portion 38 is suitable for being received by being engaged in the female portion 22 in a lateral direction perpendicular to the axis 10 .
- the limbs 24 spread apart and then move back towards each other, thereby producing a click indicating that the male portion has reached its reception position.
- the limbs are capable of bending because of the notches 30 and because of the material used, which in this case is a thermoplastic material.
- the step 28 takes up position between the male portion 38 and the core 40 .
- the connection screw 16 is thus rigidly assembled to the actuator 14 . This assembly can be disassembled. Assembly and disassembly are performed by moving the screw in translation relative to the actuator in a left-right lateral direction.
- connection screw has a flat top plate 42 and a thin bottom portion 44 of essentially rectangular section. At its bottom end it is extended by a threaded rod 46 .
- the ejector rod 20 is elongate in shape in the vertical direction. Its transverse section is essentially hollow and open. Nevertheless, this section is closed at the bottom end 48 of the rod in order to form a ring that is engaged slidably on a bottom endpiece 50 of the body 2 forming its bottom end 7 , as shown in FIG. 2 .
- the ring is suitable for coming directly into contact with the cone in order to eject it.
- the rod 20 is essentially non-rectilinear in shape so as to unite said bottom end 48 lying on the axis 10 of the pipette with the rear portion of the pipette at the top end of the rod which is off-center relative to the axis 10 .
- the rod presents a top vertical duct 52 of rectangular cross section extending from a top face 54 of the rod to a notch 56 cut horizontally into the rod from its rear face and going towards its front face. Beneath the notch, the rod has a bottom duct 58 coaxial with the top duct 52 , but this time of circular cross section.
- the diameter of the bottom duct 58 is equal to the width of the profile of the top duct 52 , and likewise the diameter of the threaded rod 46 of the screw 16 is equal to the width of the bottom portion 44 of the support.
- the knurled wheel 18 has a central threaded duct to form a screw-and-nut connection with the rod 46 of the screw 16 .
- the wheel 18 is received in the notch 56 in alignment with the ducts 52 and 58 .
- the screw 16 penetrates into both ducts and also into the wheel.
- the male portion 38 projects from the top face 54 , with the rectangular portion 44 of the support being received in the top duct 52 , thereby preventing the rod 20 from turning relative to the screw while allowing them to slide relative to each other.
- the wheel 18 forms a screw-and-nut connection with the rod 46 of the screw.
- the bottom portion of the screw is slidably received in the bottom duct 58 .
- the rod 20 is thus connected to the pipette firstly by the connection screw 16 and secondly by the ring 48 engaged on the endpiece.
- the wheel 18 is directly accessible to the user from behind the pipette through the notch. Turning the wheel causes the rod 20 to slide up or down relative to the body 2 parallel to the axis 10 , thereby adjusting its position as a function of the type of discardable cone used.
- the button 12 In order to eject a cone, the button 12 is lowered so as to bring the rod 20 to the bottom end of its stroke, thereby pushing the cone downwards and detaching it from the pipette.
- the male and females portions 38 and 22 are received inside the body of the pipette and they are inaccessible to the user. In addition, they are protected therein against impacts and against dirt. The rod 20 cannot be removed while in this position.
- the button 12 is lowered so as to place the rod in its bottom end of stroke position.
- the male and female portions are then visible.
- the rod 20 is then pushed sideways to separate the male and female portions as described above and as shown in FIG. 13 .
- This causes the rod 20 to tilt relative to the body of the pipette, with such tilting being possible because of clearance at the ring 48 .
- the bottom portion of the rod is then slid downwards so as to disengage it from the pipette. Reassembly is performed by following the same operations in reverse order.
- the rod 20 can be assembled and removed without applying force, unlike the longitudinal connection obtained by friction in the prior art.
- the rod 20 , the knurled wheel 18 , and the screw 16 constitute a first portion of the ejector arm suitable for being engaged laterally in the second portion of the arm as formed by the actuator.
- the rod can also be removed under such circumstances by turning the wheel until it becomes disengaged from the connection screw 16 .
- the rod 20 cannot be separated from the actuator 14 by sliding parallel to the axis 10 . It is necessary to begin by imparting relative movement in a lateral direction. There is thus no likelihood of untimely separation occurring while ejecting a cone.
- the knurled wheel 18 serves to adjust the length of the ejector arm constituted by the actuator 14 and the rod 20 over a known range of length values.
- the rod 20 could be connected to the actuator 14 by connections of other types that impede relative sliding between these parts of the ejector, for example one or more screw-and-nut connections or a bayonet type connection.
- the characteristics enabling the length of the arm to be adjusted over a known range of values can be implemented independently of the characteristics relating to the arm being made up of two portions that are engaged one in the other and that can be separated in a direction that is perpendicular to the longitudinal direction.
Abstract
The sampling pipette comprises a body (2) and an arm movable relative to the body to eject a cone (9) fixed to the pipette, ejection taking place in a longitudinal direction (10) of the pipette, the arm having both a first portion (16, 18, 20) suitable for coming into contact with the cone, and a second portion (14). 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 (2) by means of an initial movement in a direction that is essentially perpendicular to the longitudinal direction (10).
Description
- This application is a continuation of U.S. patent application Ser. No. 10/240,348 filed Mar. 24, 2003, which claims priority to International Application PCT/FR01/01071, filed Apr. 9, 2001, which claims priority to French Patent Application 00/04470, filed Apr. 07, 2000. Each of these priority documents, including the specification, drawings, claims, and abstract, are incorporated herein by reference in their entirety.
- The invention relates to pipettes for taking liquid samples.
- A sampling pipette is known, e.g. from document FR 2,696,110, that is suitable for receiving a discardable cone at its bottom end, which cone is held on the pipette by means of friction. The pipette has an ejector that can be actuated by means of a button adjacent to a sampling button. Pressing on that button enables the cone to be pushed away from the pipette when it is desired to replace a used cone with a new cone.
- In that pipette, the ejector has an arm with a bottom portion for coming into direct contact with the cone, and a top portion to which the bottom portion is secured by friction engagement in the longitudinal direction of the pipette. This engagement enables the bottom portion of the ejector to be assembled simply and quickly onto the pipette and to be removed with the same advantages. Nevertheless, while ejecting a cone, at the moment when the cone gives way and becomes detached from the tip of the pipette, the ejector follows the cone and its speed increases suddenly. The movement of the ejector is then stopped sharply because the top portion comes into abutment against the body of the pipette. The same braking force is transmitted to the bottom portion via the friction engagement. Unfortunately, this force tends to undo the engagement between the bottom and top portions and to separate them from each other. After ejecting some number of cones, it can thus happen that the bottom portion of the ejector becomes separated from the pipette in untimely manner.
- Document WO 96/37302
- has a FIG. 19 providing for an ejector in which the bottom portion that pushes against the cone is itself engaged in the longitudinal direction of the pipette in a top portion of the ejector. A fixing tongue holds together the two interconnected portions and prevents them from separating in untimely manner. Nevertheless, in order to remove the bottom portion, it is necessary to reach the tongue, and that is rather awkward.
- An object of the invention is to provide a pipette of a different type that avoids untimely separation of the bottom portion of the ejector, but in which the ejector remains easy to remove.
- To achieve this object, the invention provides a sampling pipette comprising 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, wherein 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.
- Thus, because the arm still comprises two portions that are assembled together, it can continue to be removed in simple manner. Nevertheless, the invention prevents the portions separating in untimely manner under the effect of forces that arise during ejection. In addition, since the friction connection is no longer essential, a connection can be provided that is suitable for being assembled and disassembled without applying force.
- The invention may also present at least any one of the following characteristics:
-
- the pipette is organized in such a manner that the engagement direction is lateral;
- the pipette is organized in such a manner that there is only one engagement direction;
- one of the arm portions is T-shaped, suitable for being received in a correspondingly-shaped housing of the other portion;
- the pipette is organized in such a manner that the two portions can be separated from each other without previously disassembling the pipette;
- the body of the pipette forms an obstacle to separating the two portions, at least when the arm lies at a high end of the ejection stroke;
- the pipette is organized in such a manner that the body enables the two portions to be separated when the arm lies at a low end of the ejection stroke; and
- the pipette includes adjustment means, enabling the length of the arm to be varied continuously over a range of values.
- Other characteristics and advantages of the invention appear further from the following description of a preferred embodiment given by way of non-limiting example. In the accompanying drawings:
-
FIG. 1 is a perspective view of the ejector mechanism of a pipette constituting a preferred embodiment of the invention; -
FIG. 2 is a fragmentary axial section view of the pipette showing the location of theFIG. 1 mechanism; -
FIGS. 3 and 4 are two perspective views of the actuator of theFIG. 1 device; -
FIG. 5 is a fragmentary axial section view on plane V-V of theFIG. 3 actuator; -
FIG. 5A is an axial section view on plane A-A of theFIG. 5 actuator; -
FIGS. 6 and 7 are a rear view and a left-hand view of the connection screw of theFIG. 1 mechanism; -
FIGS. 8 and 9 are two cross-section views on planes VIII-VIII and IX-IX of theFIG. 7 screw; -
FIGS. 10 and 11 are a perspective view and an axial section view of the ejector rod of theFIG. 1 mechanism; -
FIG. 12 is a plan view of theFIG. 10 ejector 5 rod; and -
FIG. 13 is a diagram showing how the ejector rod is put into place on the pipette. - The sampling pipette constituting the present invention of the invention is of the same type as that described in document FR-2,696,110. Reference should therefore be made to that document for various details of the pipette already disclosed therein. Only certain aspects of the cone ejector mechanism are described in detail below.
- With reference to
FIG. 2 , the pipette conventionally comprises abody 2 serving as a handle for holding in the user's hand. The pipette has apiston 6 that is slidably movable along alongitudinal axis 10 of the pipette in a bottom cavity of the pipette in order to suck up a volume of liquid that is to be taken into said cavity, or else to expel it therefrom. Displacement of the piston is controlled in particular by means of a control rod on theaxis 10 having its bottom portion connected to the piston by parts of known type. At its top end, the rod is surmounted by a pushbutton that is rigidly fixed to the rod and that the user can actuate with the thumb of the hand holding the pipette. The piston thus moves down and up as a function of the same movement of the button. The pipette includes a return spring suitable for returning the piston and the rod to the high position at the end of their down stroke for expelling liquid, and a purge spring whose effect is added to that of the preceding spring when the stroke of the piston is continued downwards for a purge stroke. The pipette has abottom tip 7 suitable for receiving adiscardable sampling cone 9 in conventional manner, which cone is held by friction acting on the outside of the bottom tip. - The pipette has a cone ejector mechanism as shown in
FIGS. 1 and 2 . This mechanism comprises, going downwards along the longitudinal direction of the pipette: acontrol button 12; anactuator 14; aconnection screw 16; aknurled wheel 18; and anejector rod 20. TheFIG. 1 ejector mechanism extends over the rear portion of the pipette, i.e. the portion beside the palm of the user's hand. - The
actuator 14 is generally elongate in shape in a downward direction and it tapers downwards. It is received in thebody 2 of the pipette so as to be slidably movable therein along theaxis 10. The pipette is arranged in such a manner that downward pressure on thebutton 12 causes theactuator 14 to move down. The connection between the button and the actuator can be of conventional type and is not described herein. Areturn spring 19 shown inFIG. 2 serves to raise theactuator 14 when force is no longer applied to thebutton 12. - With reference to
FIGS. 3, 4 , 5, and 5A, theactuator 14 presents a bottom end formed by afemale coupling portion 22. This portion is shaped in a direction parallel to theaxis 10 and has a generally U-shaped cross-section, and more precisely a cross-section in the form of a portion of an ellipse with bothlimbs 24 of the U-shape extending towards each other at both ends. Theopening 26 of the U-shape faces sideways, in this case towards the left-hand side of the pipette. The bottom edge of thecoupling portion 22 has a shoulder forming astep 28 projecting radially towards the inside of the U-shape. Nevertheless, this shoulder is also U-shaped. Eachlimb 24 is separated from the remainder of the actuator by ahorizontal notch 30 extending from a point situated about halfway along the length of the branch to the free end thereof. The coupling portion forms acavity 32 between thelimbs 24. - With reference to FIGS. 6 to 9, the
connection screw 16 has atop head 34. Thehead 34 includes asupport 36 generally in the form of a rectangular parallelepiped and amale coupling portion 38 suitable for penetrating into thefemale coupling portion 22 of the actuator. For this purpose, themale coupling portion 38 is of constant section parallel to theaxis 10, while transversely to said axis it is generally of elliptical shape. Theconnection screw 16 has a core 40 from which thesupport 36 projects upwards, being offset laterally relative thereto. The height of themale portion 38 is less than the height of thesupport 36. The top ends of themale portion 38 and of thesupport 36 are at the same level, but the male portion lies at a distance from the core 40 so as to enable thestep 28 to pass between them. Themale portion 38 extends towards the right, projecting from thesupport 36, and also towards the front and towards the rear. Seen from the left and from the right it presents a T-shaped profile. - The
male portion 38 is suitable for being received by being engaged in thefemale portion 22 in a lateral direction perpendicular to theaxis 10. During insertion, thelimbs 24 spread apart and then move back towards each other, thereby producing a click indicating that the male portion has reached its reception position. The limbs are capable of bending because of thenotches 30 and because of the material used, which in this case is a thermoplastic material. Thestep 28 takes up position between themale portion 38 and thecore 40. Theconnection screw 16 is thus rigidly assembled to theactuator 14. This assembly can be disassembled. Assembly and disassembly are performed by moving the screw in translation relative to the actuator in a left-right lateral direction. - The
core 40 of the connection screw has a flattop plate 42 and athin bottom portion 44 of essentially rectangular section. At its bottom end it is extended by a threadedrod 46. - With reference to FIGS. 10 to 12, the
ejector rod 20 is elongate in shape in the vertical direction. Its transverse section is essentially hollow and open. Nevertheless, this section is closed at thebottom end 48 of the rod in order to form a ring that is engaged slidably on abottom endpiece 50 of thebody 2 forming itsbottom end 7, as shown inFIG. 2 . The ring is suitable for coming directly into contact with the cone in order to eject it. In addition, therod 20 is essentially non-rectilinear in shape so as to unite saidbottom end 48 lying on theaxis 10 of the pipette with the rear portion of the pipette at the top end of the rod which is off-center relative to theaxis 10. - At its top end, the rod presents a top
vertical duct 52 of rectangular cross section extending from atop face 54 of the rod to anotch 56 cut horizontally into the rod from its rear face and going towards its front face. Beneath the notch, the rod has abottom duct 58 coaxial with thetop duct 52, but this time of circular cross section. The diameter of thebottom duct 58 is equal to the width of the profile of thetop duct 52, and likewise the diameter of the threadedrod 46 of thescrew 16 is equal to the width of thebottom portion 44 of the support. - The
knurled wheel 18 has a central threaded duct to form a screw-and-nut connection with therod 46 of thescrew 16. - The
wheel 18 is received in thenotch 56 in alignment with theducts screw 16 penetrates into both ducts and also into the wheel. Themale portion 38 projects from thetop face 54, with therectangular portion 44 of the support being received in thetop duct 52, thereby preventing therod 20 from turning relative to the screw while allowing them to slide relative to each other. Thewheel 18 forms a screw-and-nut connection with therod 46 of the screw. The bottom portion of the screw is slidably received in thebottom duct 58. Therod 20 is thus connected to the pipette firstly by theconnection screw 16 and secondly by thering 48 engaged on the endpiece. - The
wheel 18 is directly accessible to the user from behind the pipette through the notch. Turning the wheel causes therod 20 to slide up or down relative to thebody 2 parallel to theaxis 10, thereby adjusting its position as a function of the type of discardable cone used. - In order to eject a cone, the
button 12 is lowered so as to bring therod 20 to the bottom end of its stroke, thereby pushing the cone downwards and detaching it from the pipette. - When the ejector mechanism is at rest, i.e. at the top end of its stroke, the male and
females portions rod 20 cannot be removed while in this position. - In order to remove the
rod 20 and separate it from the pipette, thebutton 12 is lowered so as to place the rod in its bottom end of stroke position. The male and female portions are then visible. Therod 20 is then pushed sideways to separate the male and female portions as described above and as shown inFIG. 13 . This causes therod 20 to tilt relative to the body of the pipette, with such tilting being possible because of clearance at thering 48. The bottom portion of the rod is then slid downwards so as to disengage it from the pipette. Reassembly is performed by following the same operations in reverse order. Therod 20 can be assembled and removed without applying force, unlike the longitudinal connection obtained by friction in the prior art. - It can thus be seen that the
rod 20, theknurled wheel 18, and thescrew 16 constitute a first portion of the ejector arm suitable for being engaged laterally in the second portion of the arm as formed by the actuator. - It should be observed that the rod can also be removed under such circumstances by turning the wheel until it becomes disengaged from the
connection screw 16. However that would separate therod 20, thescrew 16, and theknurled wheel 18 from one another, whereas the procedure described above keeps these three parts connected together. - Because of the
step 28, therod 20 cannot be separated from theactuator 14 by sliding parallel to theaxis 10. It is necessary to begin by imparting relative movement in a lateral direction. There is thus no likelihood of untimely separation occurring while ejecting a cone. - The
knurled wheel 18 serves to adjust the length of the ejector arm constituted by theactuator 14 and therod 20 over a known range of length values. - Naturally, numerous modifications could be applied to the invention without going beyond the ambit thereof.
- For example, the
rod 20 could be connected to theactuator 14 by connections of other types that impede relative sliding between these parts of the ejector, for example one or more screw-and-nut connections or a bayonet type connection. - The characteristics enabling the length of the arm to be adjusted over a known range of values can be implemented independently of the characteristics relating to the arm being made up of two portions that are engaged one in the other and that can be separated in a direction that is perpendicular to the longitudinal direction.
Claims (18)
1. A sampling pipette comprising:
(a) a body; and
(b) an ejector arm attached to the body, the ejector arm comprising an ejector rod and an actuator connected to the ejector rod, wherein the ejector rod and the actuator are engaged one in the other such that the ejector rod and the actuator may be separated by moving the ejector rod sideways with respect to the actuator.
2. The sampling pipette of claim 1 , wherein the ejector rod can be separated from the actuator without removing the actuator from the body.
3. The sampling pipette of claim 2 , wherein the ejector rod can be separated from the actuator only when the ejector rod is at the bottom end of a purge stroke.
4. The sampling pipette of claim 1 , wherein the ejector rod and the actuator can be assembled in only one direction.
5. The sampling pipette of claim 1 , wherein the connection between the actuator and the ejector rod comprises a connection screw.
6. The sampling pipette of claim 5 , wherein the ejector rod comprises a vertical duct for housing the connection screw.
7. The sampling pipette of claim 6 , wherein the ejector rod further comprises a ring capable of slidable engagement with an endpiece of the body.
8. The sampling pipette of claim 1 , wherein the connection between the ejector rod and the actuator comprises a male-female connection.
9. The sampling pipette of claim 1 , wherein the connection between the ejector rod and the actuator comprises a bayonet-type connection.
10. A sampling pipette comprising:
(a) a body;
(b) an ejector arm attached to the body, the ejector arm comprising an ejector rod and an actuator engaged one in the other through a connection, wherein the connection comprises a sideways facing generally U-shaped portion and a male portion adapted to be received in a lateral direction by the generally U-shaped portion.
11. The sampling pipette of claim 10 , wherein the generally U-shaped portion comprises a bottom edge comprising shoulder forming a step projecting radially from the inside of the U-shape.
12. The sampling pipette of claim 10 , wherein the male portion is disposed on a T-shaped connection screw.
13. The sampling pipette of claim 12 , wherein a support connects the T-shaped connection screw and the male portion.
14. The sampling pipette of claim 13 , wherein the T-shaped connection screw comprises a core and a threaded rod.
15. The sampling pipette of claim 14 , wherein the threaded rod is screwed into an opening in the ejector rod.
16. The sampling pipette of claim 10 , wherein the generally U-shaped portion comprises limbs that spread apart to accept the male portion.
17. The sampling pipette of claim 10 , wherein the generally U-shaped portion and the male portion are constructed from thermoplastic material.
18. A detachable ejector for a liquid sample pipette, the ejector comprising a connection screw threaded into an ejector rod through a knurled wheel, wherein the ejector rod is capable of reversible assembly with a pipette body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/115,434 US20050191215A1 (en) | 2000-04-07 | 2005-04-27 | Liquid sample pipette with detachable ejector |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR00/04470 | 2000-04-07 | ||
FR0004470A FR2807341B1 (en) | 2000-04-07 | 2000-04-07 | PIPETTE FOR COLLECTING LIQUID SAMPLES WITH REMOVABLE EJECTOR |
US10/240,348 US6997067B2 (en) | 2000-04-07 | 2001-04-09 | Liquid sample pipette with detachable ejector |
PCT/FR2001/001071 WO2001076751A1 (en) | 2000-04-07 | 2001-04-09 | Liquid sample pipette with detachable ejector |
US11/115,434 US20050191215A1 (en) | 2000-04-07 | 2005-04-27 | Liquid sample pipette with detachable ejector |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/240,348 Continuation US6997067B2 (en) | 2000-04-07 | 2001-04-09 | Liquid sample pipette with detachable ejector |
PCT/FR2001/001071 Continuation WO2001076751A1 (en) | 2000-04-07 | 2001-04-09 | Liquid sample pipette with detachable ejector |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050191215A1 true US20050191215A1 (en) | 2005-09-01 |
Family
ID=8848992
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/240,348 Expired - Lifetime US6997067B2 (en) | 2000-04-07 | 2001-04-09 | Liquid sample pipette with detachable ejector |
US11/115,434 Abandoned US20050191215A1 (en) | 2000-04-07 | 2005-04-27 | Liquid sample pipette with detachable ejector |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/240,348 Expired - Lifetime US6997067B2 (en) | 2000-04-07 | 2001-04-09 | Liquid sample pipette with detachable ejector |
Country Status (14)
Country | Link |
---|---|
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) |
RU (1) | RU2259880C2 (en) |
WO (1) | WO2001076751A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008060171A2 (en) * | 2006-11-16 | 2008-05-22 | Pz Htl Spolka Akcyjna | An exchangeable pipette tip ejection device |
US20130095508A1 (en) * | 2009-09-18 | 2013-04-18 | Minifab (Australia) Pty Ltd | Instrumented pipette |
EP2672003B1 (en) | 2008-08-15 | 2016-07-27 | Otis Elevator Company | Elevator load bearing member with a polymer jacket having a flame retardant in the polymer jacket material |
US10429403B2 (en) | 2014-06-17 | 2019-10-01 | Yamaha Hatsudoki Kabushiki Kaisha | Head device for mounting dispensing tip thereon, and movement device using same |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2807345B1 (en) * | 2000-04-07 | 2002-07-12 | Gilson Sa | SIMPLIFIED DISASSEMBLY PIPETTE |
FR2807340B1 (en) | 2000-04-07 | 2002-12-06 | Gilson Sa | PIPETTE FOR TAKING LIQUID SAMPLES WITH CONE EJECTOR MECHANISM |
FR2807341B1 (en) | 2000-04-07 | 2002-07-12 | Gilson Sa | PIPETTE FOR COLLECTING LIQUID SAMPLES WITH REMOVABLE EJECTOR |
FR2807343B1 (en) | 2000-04-07 | 2002-12-06 | Gilson Sa | COLLECTION PIPETTE PROVIDED WITH MEANS FOR ADJUSTING THE VOLUME TO BE COLLECTED |
FR2807342B1 (en) * | 2000-04-07 | 2002-07-12 | Gilson Sa | CONCEAL EJECTOR PIPETTE |
FIU20010274U0 (en) * | 2001-07-06 | 2001-07-06 | Biohit Oyj | The suction device |
US7824102B2 (en) * | 2006-12-09 | 2010-11-02 | Shenzhen Mindray Bio-Medical Electronics, Inc. | Thermometer quick linkage apparatus and method |
US20090071267A1 (en) * | 2007-09-17 | 2009-03-19 | Greg Mathus | Pipette tip ejection mechanism |
PL233500B1 (en) * | 2011-05-31 | 2019-10-31 | Pz Htl Spolka Akcyjna | Pipette for use with a pipette tip |
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US6833114B1 (en) * | 1999-05-18 | 2004-12-21 | Socorex Isba S.A. | Pipette with tip ejector |
US6997067B2 (en) * | 2000-04-07 | 2006-02-14 | Gilson S.A.S. | Liquid sample pipette with detachable ejector |
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- 2001-04-09 JP JP2001574260A patent/JP4759204B2/en not_active Expired - Lifetime
- 2001-04-09 MX MXPA02009873A patent/MXPA02009873A/en active IP Right Grant
- 2001-04-09 AU AU5045401A patent/AU5045401A/en active Pending
- 2001-04-09 KR KR1020027013298A patent/KR100687590B1/en active IP Right Grant
- 2001-04-09 AT AT01923761T patent/ATE398488T1/en not_active IP Right Cessation
- 2001-04-09 RU RU2002125875/04A patent/RU2259880C2/en active
- 2001-04-09 WO PCT/FR2001/001071 patent/WO2001076751A1/en active IP Right Grant
- 2001-04-09 CA CA002404742A patent/CA2404742C/en not_active Expired - Lifetime
- 2001-04-09 US US10/240,348 patent/US6997067B2/en not_active Expired - Lifetime
- 2001-04-09 DK DK01923761T patent/DK1268069T3/en active
- 2001-04-09 EP EP01923761A patent/EP1268069B1/en not_active Expired - Lifetime
- 2001-04-09 CN CNB01807295XA patent/CN1210106C/en not_active Expired - Lifetime
- 2001-04-09 AU AU2001250454A patent/AU2001250454B2/en not_active Ceased
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US3882729A (en) * | 1973-04-16 | 1975-05-13 | Oxford Lab | Liquid transfer pipetting device with a factory adjustable and sealable calibration stop |
US4009611A (en) * | 1976-05-13 | 1977-03-01 | Oxford Laboratories Inc. | Hand-held micropipettor with improved pipette tip ejector |
US4151750A (en) * | 1977-02-17 | 1979-05-01 | Kommandiittiyhtio Finnpipette Osmo A. Suovaniemi | Device for detaching and removing a disposable tip of a pipette |
US5614153A (en) * | 1995-05-26 | 1997-03-25 | Rainin Instrument Co., Inc. | Pipette tip ejector |
US6833114B1 (en) * | 1999-05-18 | 2004-12-21 | Socorex Isba S.A. | Pipette with tip ejector |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008060171A2 (en) * | 2006-11-16 | 2008-05-22 | Pz Htl Spolka Akcyjna | An exchangeable pipette tip ejection device |
WO2008060171A3 (en) * | 2006-11-16 | 2008-10-09 | Pz Htl Spolka Akcyjna | An exchangeable pipette tip ejection device |
EP2672003B1 (en) | 2008-08-15 | 2016-07-27 | Otis Elevator Company | Elevator load bearing member with a polymer jacket having a flame retardant in the polymer jacket material |
US20130095508A1 (en) * | 2009-09-18 | 2013-04-18 | Minifab (Australia) Pty Ltd | Instrumented pipette |
US10429403B2 (en) | 2014-06-17 | 2019-10-01 | Yamaha Hatsudoki Kabushiki Kaisha | Head device for mounting dispensing tip thereon, and movement device using same |
Also Published As
Publication number | Publication date |
---|---|
WO2001076751A1 (en) | 2001-10-18 |
JP4759204B2 (en) | 2011-08-31 |
AU5045401A (en) | 2001-10-23 |
EP1268069B1 (en) | 2008-06-18 |
US20030159525A1 (en) | 2003-08-28 |
RU2259880C2 (en) | 2005-09-10 |
EP1268069A1 (en) | 2003-01-02 |
CA2404742C (en) | 2009-02-10 |
CN1419478A (en) | 2003-05-21 |
MXPA02009873A (en) | 2004-05-05 |
KR20020087953A (en) | 2002-11-23 |
US6997067B2 (en) | 2006-02-14 |
KR100687590B1 (en) | 2007-02-28 |
CA2404742A1 (en) | 2002-10-01 |
DK1268069T3 (en) | 2008-10-20 |
FR2807341A1 (en) | 2001-10-12 |
ATE398488T1 (en) | 2008-07-15 |
CN1210106C (en) | 2005-07-13 |
FR2807341B1 (en) | 2002-07-12 |
AU2001250454B2 (en) | 2006-03-02 |
DE60134462D1 (en) | 2008-07-31 |
JP2003530210A (en) | 2003-10-14 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |