WO2005050554A1 - Digital counter for adjustable pipette - Google Patents

Digital counter for adjustable pipette Download PDF

Info

Publication number
WO2005050554A1
WO2005050554A1 PCT/FI2004/000695 FI2004000695W WO2005050554A1 WO 2005050554 A1 WO2005050554 A1 WO 2005050554A1 FI 2004000695 W FI2004000695 W FI 2004000695W WO 2005050554 A1 WO2005050554 A1 WO 2005050554A1
Authority
WO
WIPO (PCT)
Prior art keywords
digital
ring
pipette
plunger
digital ring
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.)
Ceased
Application number
PCT/FI2004/000695
Other languages
French (fr)
Inventor
Juha Telimaa
Mauno Heinonen
Tapani Pullinen
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.)
Thermo Fisher Scientific Oy
Original Assignee
Thermo Electron Oy
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 Thermo Electron Oy filed Critical Thermo Electron Oy
Publication of WO2005050554A1 publication Critical patent/WO2005050554A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
    • B01L3/0224—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type having mechanical means to set stroke length, e.g. movable stops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
    • B01L2200/02—Adapting objects or devices to another
    • B01L2200/025—Align devices or objects to ensure defined positions relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/02—Identification, exchange or storage of information
    • B01L2300/025—Displaying results or values with integrated means
    • B01L2300/026—Drum counters
    • 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
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type

Definitions

  • the invention relates to a plunger-operated pipette used in dispensing liquids, having a dosage volume, which can be adjusted and having the vol- ume displayed by means of digital rings.
  • the invention relates explicitly to this display of volume.
  • the adjustment of volume in plunger-operated pipettes can be implemented by having the plunger rod provided with a thread and a nut fitted thereon, the latter being adapted to be non-rotatable relative to a housing but slidable lengthwise of the rod.
  • the housing is provided with an abutment, which jointly with the nut determines a top position for the plunger.
  • the plunger can have its intake volume set by rotating the plunger rod.
  • Patent publication Fl- 64752 (corresponds e.g. to publication EP-112887) discloses such a pipette, in which the adjusted volume is indicated by means of a series of digital rings.
  • This pipette includes a disc concentric with a plunger, which rotates incrementally together with the plunger and which drives in respective in- crements a first digital ring of the series of digital rings, which in turn, always after a certain number of increments, drives a transmission gear to dial a second digital ring by one increment.
  • the disc has its end face provided with notches matching the number spacing of the first digital ring. This face is responded by a ring spring non-rotatable relative to the pipette housing and provided with projections matching the transmission gear's notches.
  • the plunger in response to its rotation, can be locked in positions defined by notches in the disc and projections in the ring spring, the first digital ring being also locked in a position, which shows a volume-representing reading at the display point.
  • the second digital ring is held stationary between dialling actions by means of the transmission gear.
  • the inventive pipette has its first and second digital ring provided with alignment means, whereby the second digital ring is always able to place itself relative to the first digital ring, such that the volume-representing digital readings will be precisely in coincidence with each other at the reading point. Hence, reading a volume correctly is easy and reliable.
  • the alignment means may comprise a ring-encircling serration on one of the digital rings and on the other, respectively, at least one claw responding to the ser- ration.
  • FIG. 1 shows one pipette of the invention in cross-section
  • Fig. 2 shows axonometrically a first digital ring included in the pipette's set of digital rings
  • Fig. 3 shows axonometrically a second digital ring included in the pipette's set of digital rings.
  • the inventive pipette is provided with a plunger rotatable relative to a housing in such a way that, in response to its rotation, the plunger's position changes in axial direction relative to the housing and thereby defines a stroke volume of the plunger.
  • a first digital ring is rotated along with the plunger.
  • a second digital ring which is adapted through the intermediary of an indexing element, such as a transmission gear, to make a single-increment turn whenever the first digital ring has rotated a certain distance.
  • the reading point displays side by side one digital reading always from each of the digital rings, said digital readings jointly indicating the stroke volume corresponding the plunger's rotational position.
  • the digital reading of one ring may include one or more digits.
  • the digital readings are usually equidistant from each other, but they can also be at uneven intervals if required by a particular application.
  • the digital rings are further provided with alignment means for aligning the second digital ring relative to the first one to always bring the digital readings precisely on the same line relative to each other, which makes the correct reading of a volume as quick and reliable as possible.
  • one of the digital rings may have its rim provided with alignment notches, the other having at least one alignment claw responding to the notches.
  • the alignment notches can be provided particularly on the first digital ring.
  • the alignment notches can be straight-cut or faceted.
  • the alignment means can be provided with a resilient actuator, such as a spring, biasing the digital rings against each other, yet allowing for an axial movement of the rings relative to each other, such that the first digital ring may rotate without rotating the second digital ring.
  • a resilient actuator such as a spring
  • the assembly can be such that the second digital ring is axially movable.
  • the spring can be a coil spring fitted outside or inside a digital ring, especially the second digital ring.
  • a pipette of the invention will be described by way of example as follows.
  • the pipette has a housing 1 and at its bottom end a tip element 2, having its bottom end fitted with a tip container or a tip. On top of the tip element there is a sliding sleeve 3 for removing the tip. Its extension comprises an operat- ing rod 4, which is compelled to move relative to a handle by way of a gear 5 in order to reduce a required driving force (see FI 92374, which corresponds e.g. to publication EP 566939). In the tip element there is fitted a return spring 6 for the tip remover.
  • the housing is covered with a shaped hand- fitting element 7. In its top section the housing has a finger grip 8.
  • the tip element 2 extends a circular hole, which is further extended by a hole through the housing.
  • the tip element is provided with a plunger 9, having an extension in the form of a rod 10.
  • the rod has a bushing-shaped lower section fitted around the plunger's upper section. The upper portion of the rod extends through the housing.
  • the rod has its top end provided with an actuating knob 11.
  • the hole is provided with an enlargement, which has an O-ring 12 at its bottom for sealing the plunger against the tip element.
  • the O-ring is pressed from above by means of a packing spring 13 fitted between the housing and the tip element.
  • the plunger rod 10 is provided with a thread, which is adapted to carry a nut 14 whose rotation relative to the housing is prevented by means of length- wise guides and grooves. Thus, when the rod is rotated, the nut slides lengthwise of the rod.
  • the housing is provided with a limiter 15, against which the nut is pressed from below by means of a primary spring 16. Hence, the nut and the abutment define a top limit for the plunger movement.
  • the rod has its upper section fitted within a limiting collar 17 slidable thereon, the collar having a flange at its top end.
  • the housing has its bore threadedly fitted with a calibration nut 18, against which the limiting collar is pressed from below by means of a secondary spring 19 which is more powerful than the primary spring.
  • the limiting collar has its top end extending beyond and above the calibration nut for defining, together with the bottom end of the press knob, a lower limit for the plunger's dispensing action and, hence, a dosage volume.
  • the plunger When drawing liquid into the tip, the plunger is pressed against this lower limit and allowed to return to the upper limit.
  • the plunger is pressed still further against the force of the secondary spring past the lower limit in order to expel the liquid as thoroughly as possible.
  • the dosage volume is calibrated by adjusting the lower limit by turning the calibration nut.
  • the plunger rod 10 there is fitted rotatably therewith a first digital ring 20.
  • the first digital ring has thereinside two axially mounted wedges 21 and the plunger rod has complementary keyways.
  • the first digital ring has its upper end face provided on its inner rim with a stop recess 22, which is complementary to each reading of the ring and re- sponded by a protrusion in a non-rotating ring spring 23 (see FI 64752).
  • the plunger rod rotates and locks incrementally.
  • the first digital ring has its top end provided respectively with one pair of teeth 27 for turning, always after a full circle through the intermediary of the transmission gear 26, the second digital ring by an increment corresponding to the serration.
  • the first digital ring 20 has along the inside rim of its bottom edge a thinner ring having its end face provided with alignment notches 29. Each alignment notch represents one reading of the digital ring.
  • the second digital ring 25 has two alignment claws 30 on radially opposite sides to fit appropriately in the notches of the first digital ring.
  • the second digital ring has its lower sec- tion thinner and fitted on the inside with a coil spring 31. Its bottom end bears by way of a collar 32 against the limiter 15, the second digital ring being thereby pressed against the first ring by the coil spring.
  • the transmission gear 28 prevents the second digital ring from making a turn into the range of an adjacent number, except when the transmission gear is incremented by the pair of teeth 26.

Landscapes

  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices For Use In Laboratory Experiments (AREA)

Abstract

The invention relates to a pipette, which has a digital ring display for disclosing a dosage volume. Digital rings (20, 25) are provided with alignment means for aligning the second digital ring (25) with respect to the first digital ring (20), such that the digital readings will always be in line with each other at the display point. Thus, reading a volume is easy and reliable.

Description

DIGITAL COUNTER FOR ADJUSTABLE PIPETTE
Description Technical field
The invention relates to a plunger-operated pipette used in dispensing liquids, having a dosage volume, which can be adjusted and having the vol- ume displayed by means of digital rings. The invention relates explicitly to this display of volume.
Background art The adjustment of volume in plunger-operated pipettes can be implemented by having the plunger rod provided with a thread and a nut fitted thereon, the latter being adapted to be non-rotatable relative to a housing but slidable lengthwise of the rod. The housing is provided with an abutment, which jointly with the nut determines a top position for the plunger. The plunger can have its intake volume set by rotating the plunger rod. Patent publication Fl- 64752 (corresponds e.g. to publication EP-112887) discloses such a pipette, in which the adjusted volume is indicated by means of a series of digital rings. This pipette includes a disc concentric with a plunger, which rotates incrementally together with the plunger and which drives in respective in- crements a first digital ring of the series of digital rings, which in turn, always after a certain number of increments, drives a transmission gear to dial a second digital ring by one increment. The disc has its end face provided with notches matching the number spacing of the first digital ring. This face is responded by a ring spring non-rotatable relative to the pipette housing and provided with projections matching the transmission gear's notches. Thus, in response to its rotation, the plunger can be locked in positions defined by notches in the disc and projections in the ring spring, the first digital ring being also locked in a position, which shows a volume-representing reading at the display point. The second digital ring is held stationary between dialling actions by means of the transmission gear. Summary of the invention
A pipette as set forth in claim 1 has now been invented. Other claims disclose some embodiments of the invention.
The inventive pipette has its first and second digital ring provided with alignment means, whereby the second digital ring is always able to place itself relative to the first digital ring, such that the volume-representing digital readings will be precisely in coincidence with each other at the reading point. Hence, reading a volume correctly is easy and reliable.
Thus, the digital rings can be in direct contact with each other. The alignment means may comprise a ring-encircling serration on one of the digital rings and on the other, respectively, at least one claw responding to the ser- ration.
Drawings
The attached drawings constitute a part of the written description of the in- vention and relate to the subsequent detailed description of the invention. Therein
- Fig. 1 shows one pipette of the invention in cross-section
- Fig. 2 shows axonometrically a first digital ring included in the pipette's set of digital rings - Fig. 3 shows axonometrically a second digital ring included in the pipette's set of digital rings.
Detailed description of the invention
The inventive pipette is provided with a plunger rotatable relative to a housing in such a way that, in response to its rotation, the plunger's position changes in axial direction relative to the housing and thereby defines a stroke volume of the plunger. A first digital ring is rotated along with the plunger. In addition, there is a second digital ring, which is adapted through the intermediary of an indexing element, such as a transmission gear, to make a single-increment turn whenever the first digital ring has rotated a certain distance. The reading point displays side by side one digital reading always from each of the digital rings, said digital readings jointly indicating the stroke volume corresponding the plunger's rotational position. The digital reading of one ring may include one or more digits. The digital readings are usually equidistant from each other, but they can also be at uneven intervals if required by a particular application.
The digital rings are further provided with alignment means for aligning the second digital ring relative to the first one to always bring the digital readings precisely on the same line relative to each other, which makes the correct reading of a volume as quick and reliable as possible.
With regard to the alignment means, one of the digital rings may have its rim provided with alignment notches, the other having at least one alignment claw responding to the notches. The alignment notches can be provided particularly on the first digital ring. The alignment notches can be straight-cut or faceted.
The alignment means can be provided with a resilient actuator, such as a spring, biasing the digital rings against each other, yet allowing for an axial movement of the rings relative to each other, such that the first digital ring may rotate without rotating the second digital ring. In particular, the assembly can be such that the second digital ring is axially movable. The spring can be a coil spring fitted outside or inside a digital ring, especially the second digital ring.
A pipette of the invention will be described by way of example as follows.
The pipette has a housing 1 and at its bottom end a tip element 2, having its bottom end fitted with a tip container or a tip. On top of the tip element there is a sliding sleeve 3 for removing the tip. Its extension comprises an operat- ing rod 4, which is compelled to move relative to a handle by way of a gear 5 in order to reduce a required driving force (see FI 92374, which corresponds e.g. to publication EP 566939). In the tip element there is fitted a return spring 6 for the tip remover. The housing is covered with a shaped hand- fitting element 7. In its top section the housing has a finger grip 8.
Through the tip element 2 extends a circular hole, which is further extended by a hole through the housing. The tip element is provided with a plunger 9, having an extension in the form of a rod 10. The rod has a bushing-shaped lower section fitted around the plunger's upper section. The upper portion of the rod extends through the housing. The rod has its top end provided with an actuating knob 11. In the tip element's upper section, the hole is provided with an enlargement, which has an O-ring 12 at its bottom for sealing the plunger against the tip element. The O-ring is pressed from above by means of a packing spring 13 fitted between the housing and the tip element.
The plunger rod 10 is provided with a thread, which is adapted to carry a nut 14 whose rotation relative to the housing is prevented by means of length- wise guides and grooves. Thus, when the rod is rotated, the nut slides lengthwise of the rod. The housing is provided with a limiter 15, against which the nut is pressed from below by means of a primary spring 16. Hence, the nut and the abutment define a top limit for the plunger movement. The rod has its upper section fitted within a limiting collar 17 slidable thereon, the collar having a flange at its top end. Above the limiting collar, the housing has its bore threadedly fitted with a calibration nut 18, against which the limiting collar is pressed from below by means of a secondary spring 19 which is more powerful than the primary spring. The limiting collar has its top end extending beyond and above the calibration nut for defining, together with the bottom end of the press knob, a lower limit for the plunger's dispensing action and, hence, a dosage volume. When drawing liquid into the tip, the plunger is pressed against this lower limit and allowed to return to the upper limit. When discharging liquid from the tip, the plunger is pressed still further against the force of the secondary spring past the lower limit in order to expel the liquid as thoroughly as possible. The dosage volume is calibrated by adjusting the lower limit by turning the calibration nut. (Similar calibration systems have been described for example in publications FI 64752 and EP 737515, the former corresponding to publication EP 112887).
Around the plunger rod 10 there is fitted rotatably therewith a first digital ring 20. For fitting purposes, the first digital ring has thereinside two axially mounted wedges 21 and the plunger rod has complementary keyways. The first digital ring has its upper end face provided on its inner rim with a stop recess 22, which is complementary to each reading of the ring and re- sponded by a protrusion in a non-rotating ring spring 23 (see FI 64752). Thus, the plunger rod rotates and locks incrementally. Underneath the first digital ring there is a second digital ring 25. Its upper end face is provided with a gear 26. The first digital ring has its top end provided respectively with one pair of teeth 27 for turning, always after a full circle through the intermediary of the transmission gear 26, the second digital ring by an increment corresponding to the serration.
The first digital ring 20 has along the inside rim of its bottom edge a thinner ring having its end face provided with alignment notches 29. Each alignment notch represents one reading of the digital ring. The second digital ring 25 has two alignment claws 30 on radially opposite sides to fit appropriately in the notches of the first digital ring. The second digital ring has its lower sec- tion thinner and fitted on the inside with a coil spring 31. Its bottom end bears by way of a collar 32 against the limiter 15, the second digital ring being thereby pressed against the first ring by the coil spring. By virtue of the alignment notches and claws, the rings stop at an exactly desired position relative to each other, in which the rings have their readings precisely in line with each other on the display. The transmission gear 28 prevents the second digital ring from making a turn into the range of an adjacent number, except when the transmission gear is incremented by the pair of teeth 26.

Claims

Claims
1. A pipette, having a digital display to reveal a dosage volume, said pipette comprising - a housing (1),
- a plunger (9) rotatable relative to the housing in such a way that, during the course of its rotation, the plunger's position changes axially relative to the housing and defines a stroke volume for the plunger,
- a first digital ring (20), rotating along with the plunger and having its rim provided with digital readings,
- a second digital ring (25), having its rim provided with digital readings and being adapted by means of an indexing element (28) to make an incremental turn whenever the first digital ring has rotated a certain distance, and
- a reading point, which displays side by side one digital reading from each digital ring, the digital readings indicating jointly the stroke volume represented by the plunger's rotational position, characterized in that
- the digital rings (20, 25) are provided with alignment means (29, 30) for aligning the second ring (25) relative to the first one (20), such that the digi- tal readings always become in line with each other at the display point.
2. A pipette as set forth in claim 1 , wherein one (20) of the digital rings has its rim provided with alignment notches (29) and the other (25) with at least one alignment claw (30) responding to the notches.
3. A pipette as set forth in claim 2, wherein the first digital ring (20) has its rim provided with alignment notches (29) and the second digital ring (25) with at least one alignment claw (30) responding to the notches.
4. A pipette as set forth in any of claims 1...3, which includes an resilient actuator (31) for pressing the digital rings (20, 25) against each other.
5. A pipette as set forth in claim 3, which comprises a resilient actuator (31) for pressing the second digital ring (25) against the first digital ring (25).
6. A pipette as set forth in claim 4 or 5, wherein the resilient actuator (31 ) comprises a spring, such as a coil spring.
7. A pipette as set forth in claim 6, wherein the resilient actuator (31) comprises a coil spring fitted inside or around a digital ring, especially the second digital ring.
PCT/FI2004/000695 2003-11-19 2004-11-18 Digital counter for adjustable pipette Ceased WO2005050554A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20031682 2003-11-19
FI20031682A FI20031682A0 (en) 2003-11-19 2003-11-19 Näyttöpipetti

Publications (1)

Publication Number Publication Date
WO2005050554A1 true WO2005050554A1 (en) 2005-06-02

Family

ID=29558651

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2004/000695 Ceased WO2005050554A1 (en) 2003-11-19 2004-11-18 Digital counter for adjustable pipette

Country Status (2)

Country Link
FI (1) FI20031682A0 (en)
WO (1) WO2005050554A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2452753A2 (en) 2010-11-11 2012-05-16 Thermo Fisher Scientific Oy Support pipette
EP2452752A1 (en) 2010-11-11 2012-05-16 Thermo Fisher Scientific Oy Handle pipette
WO2013057376A1 (en) 2011-10-20 2013-04-25 Thermo Fisher Scientific Oy Pipette with piston rotation lock
FR2986718A1 (en) * 2012-02-13 2013-08-16 Gilson Sas PIPETTE FOR DETECTING, SIMPLIFIEDLY DETECTION, PASSING THE PISTON BY A PREDETERMINED POSITION
EP2700450A1 (en) 2012-08-20 2014-02-26 Thermo Fisher Scientific Oy Sealed pipette
JP2018512261A (en) * 2015-04-16 2018-05-17 インテグラ バイオサイエンシーズ アーゲー Volume adjustment mechanism for manual pipette
CN113856783A (en) * 2021-12-02 2021-12-31 潍坊市检验检测中心 Food inspection ultrasonic cavitation liquid-transfering device
WO2022082480A1 (en) * 2020-10-21 2022-04-28 钱陈 Pipettor with counting function

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554134A (en) * 1982-06-29 1985-11-19 Labsystems Oy Pipette with adjustable volume
DE4115377A1 (en) * 1990-05-11 1991-11-14 Veglia Borletti Srl Drum counter with integral alignment for mileometer - uses sprung tooth mechanism to locate wheels in alignment
US5531131A (en) * 1993-10-21 1996-07-02 Eppendorf-Netheler-Hinz Gmbh Device for adjusting correction factor of a plunger lift pipet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554134A (en) * 1982-06-29 1985-11-19 Labsystems Oy Pipette with adjustable volume
DE4115377A1 (en) * 1990-05-11 1991-11-14 Veglia Borletti Srl Drum counter with integral alignment for mileometer - uses sprung tooth mechanism to locate wheels in alignment
US5531131A (en) * 1993-10-21 1996-07-02 Eppendorf-Netheler-Hinz Gmbh Device for adjusting correction factor of a plunger lift pipet

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2452753A2 (en) 2010-11-11 2012-05-16 Thermo Fisher Scientific Oy Support pipette
EP2452752A1 (en) 2010-11-11 2012-05-16 Thermo Fisher Scientific Oy Handle pipette
WO2013057376A1 (en) 2011-10-20 2013-04-25 Thermo Fisher Scientific Oy Pipette with piston rotation lock
US9901919B2 (en) 2011-10-20 2018-02-27 Thermo Fisher Scientific Oy Pipette with piston rotation lock
FR2986718A1 (en) * 2012-02-13 2013-08-16 Gilson Sas PIPETTE FOR DETECTING, SIMPLIFIEDLY DETECTION, PASSING THE PISTON BY A PREDETERMINED POSITION
WO2013120862A1 (en) * 2012-02-13 2013-08-22 Gilson Sas Sampling pipette which detects the passage of the piston through a predetermined position
US9440230B2 (en) 2012-02-13 2016-09-13 Gilson Sas Sampling pipette which detects the passage of the piston through a predetermined position
EP2700450A1 (en) 2012-08-20 2014-02-26 Thermo Fisher Scientific Oy Sealed pipette
JP2018512261A (en) * 2015-04-16 2018-05-17 インテグラ バイオサイエンシーズ アーゲー Volume adjustment mechanism for manual pipette
WO2022082480A1 (en) * 2020-10-21 2022-04-28 钱陈 Pipettor with counting function
CN113856783A (en) * 2021-12-02 2021-12-31 潍坊市检验检测中心 Food inspection ultrasonic cavitation liquid-transfering device

Also Published As

Publication number Publication date
FI20031682A0 (en) 2003-11-19

Similar Documents

Publication Publication Date Title
US4554134A (en) Pipette with adjustable volume
WO2005050554A1 (en) Digital counter for adjustable pipette
EP2451614B1 (en) Multi-scale mechanism
CN100450626C (en) Volume adjustable manual pipette with quick set volume adjustment
US4096750A (en) Hand-held micropipettor with fluid transfer volume adjustment mechanism
US6959616B2 (en) Pipette provided with sampled volume adjusting means
US20140196351A1 (en) Low profile auto-locking pinch/turn adjustment knob
US7105130B2 (en) Adjustable pipette
JP6494630B2 (en) Sampling pipette with improved device for adjusting and displaying the sampled volume
EP2768614B1 (en) Pipette with piston rotation lock
EP3684513B1 (en) Pipette calibration and volume offset mechanism
WO1986005854A1 (en) A calibrated handknob assembly
KR20200143395A (en) Volume adjustment screw lock for pipetting systems
US5347878A (en) Pipette with locking adjustment and method for using the same
US3889594A (en) Hand-held self-adhesive-label applicators
US3937910A (en) Timer having a variable operation period
JP7253539B2 (en) Dog clutch system to hold the position of the volume adjustment screw for the sampling pipette
US4110722A (en) Variable resistance control
US4284004A (en) Type character selecting mechanism for printing head
GB2320313A (en) Adjusting device for a radiator valve
US4362391A (en) Watch with a calendar display and hand setting device actuated by a setting shaft
NO133620B (en)
US2025239A (en) Hand setting device
EP4497457A1 (en) Dosing mechanism
CA1283576C (en) Printing mechanism

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

122 Ep: pct application non-entry in european phase