EP0250095A2 - Flüssigkeitsabgabevorrichtung - Google Patents

Flüssigkeitsabgabevorrichtung Download PDF

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Publication number
EP0250095A2
EP0250095A2 EP87304446A EP87304446A EP0250095A2 EP 0250095 A2 EP0250095 A2 EP 0250095A2 EP 87304446 A EP87304446 A EP 87304446A EP 87304446 A EP87304446 A EP 87304446A EP 0250095 A2 EP0250095 A2 EP 0250095A2
Authority
EP
European Patent Office
Prior art keywords
liquid
dispenser according
liquid dispenser
supporting member
stop
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.)
Withdrawn
Application number
EP87304446A
Other languages
English (en)
French (fr)
Other versions
EP0250095A3 (en
Inventor
Ian Michael Daines Gaylor
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.)
Jencons Scientific Ltd
Original Assignee
Jencons Scientific Ltd
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 Jencons Scientific Ltd filed Critical Jencons Scientific Ltd
Publication of EP0250095A2 publication Critical patent/EP0250095A2/de
Publication of EP0250095A3 publication Critical patent/EP0250095A3/en
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • This invention relates to a liquid dispenser.
  • Liquid dispensing units for this purpose are known, and in general comprise a cylinder and piston unit operable with an adjustable stroke to draw in a selected amount of liquid from the reservoir and discharge this selected amount of liquid through a discharge tube.
  • a liquid dispenser comprises a unit having means enabling its connection to a reservoir containing a liquid to be dispensed and a discharge tube through which a selected amount of said liquid can be dispensed, the unit including a cylinder and piston combination enabling the selected amount of liquid to be drawn into the cylinder from the reservoir through a check valve means and the said selected amount of liquid to be dispensed through the discharge tube via a second check valve means, wherein a selector means for adjustable stops for setting the cylinder/piston stroke to select the amount of liquid to be dispensed is coupled to an electromechanical transducer which provides an electrical signal for controlling operation of a display means which indicates the amount of liquid selected.
  • a preferred display means is a digital display device incorporated in the unit and eletrically driven by a drive signal obtained by processing the output signal of the transducer, which latter preferably comprises a potentiometer.
  • the selector means includes a stop supporting member which is rotatable for setting the cylinder/piston stroke.
  • Said member may conveniently carry a helical gear which drives a pinion coupled to the transducer.
  • the said stop supporting member is preferably rotatable in angular steps, defined by detent means, to select any one of a plurality of stops of differing axial length which limit the cylinder/piston stroke. Such rotation of the stop supporting member thus provides for coarse selection of the amount of liquid to be dispensed.
  • the stop supporting member is preferably also adjustable in the axial direction, carrying the axially extending stops with it.
  • the helical gear then acts as a rack to drive the pinion.
  • Axial movement of the stop supporting member may be enabled by a tapered thrust washer.
  • the detent means which defines the angular position of the stop supporting member may conveniently take the form of a spring loaded ball detent cooperating with angularly spaced slots in the stop supporting member.
  • This detent means preferably in conjunction with the above-mentioned tapered thrust washer, is then able to act to preload the gear/pinion coupling in order to minimise backlash.
  • each axially extending stop is preferably formed in two diametrically opposed similar parts.
  • the range of rotational adjustment of the stop supporting member, and thus of the gear coupling which drives the transducer may be increased by arranging the stops of progressively increasing axial length in two or more interleaved groups.
  • the said angularly extending stops each comprising two diametrically opposed similar parts, preferably cooperate with a pair of stop elements carried by a piston drive member which is exposed for manual operation.
  • Said stop elements are preferably also a diametrically opposed pair, conveniently on a diameter at right angles to the diameter on which the gear coupling is located, so that wear in the gears does not affect the accuracy of selection of the amount of liquid to be dispensed.
  • the unit illustrated in Figure 1 comprises a casing 10 of plastics material having an attached base fitting 12 which enables the unit to be screw connected to the threaded neck of a storage jar constituting a reservoir for a liquid chemical to be dispensed.
  • Reference 14 denotes a discharge tube through which a selected amount of said liquid is discharged when the unit is used.
  • a digital display 16 is operable to indicate the amount of liquid selected for dispensing, whilst on/off switch 18 switches the display device, and its associated electronics, powered from an on-board battery source, on and off.
  • a cylinder 20 surrounding a piston 22, both cylinder and piston being made of boro-silicate glass.
  • the cylinder 20 is sealed at the bottom via 'O' ring 24 to the base fitting 12 and at the top resiliently seals by means of 'O' ring 26 to moulded inner sleeve member 28, which at the bottom is assembled by means of screws to the base fitting 12, thus clamping the cylinder in position.
  • the base fitting 12 accommodates moulded fittings in the form of a mounting screw 70 enabling fitting of the unit to a bottle neck, check valve housing for boro-silicate glass check valves referenced 72, 74, 76, 78 and the mounting 80 for the dispensing spout 14, which comprises discharge tube 82 retained by retaining sleeve 84.
  • Reference 86 denotes a suction tube via which liquid is drawn into the cylinder 20 through check valve 72, 74. Dispensing through the discharge tube 14 is via check valve 76, 78.
  • the piston is axially displaced in the cylinder 20 by means of moulded cap member 30, which has lugs 32 by which it clips to rim 34 of the piston 22.
  • the cap member 30 has a main wall principally accommodated between the inner sleeve member 28 and a moulded outer sleeve member 36, and the cap member 30 has two external stops 38 which bear against internal fins 40 provided around an adjustable ring 41 constituted by the upper end of the outer sleeve member 36.
  • the fins 40 increment in length from a minimum to a maximum to define the dispensing range of the unit and to enable coarse adjustment within this range by stepped variation of the stroke of the piston.
  • the outer sleeve member 36 is in practice formed by coaxial upper and lower mouldings which cooperate at stepped split line 35, torsional drive between the mouldings being enabled by the extension of three pairs of stop fins 40 downwardly from the upper moulding into slots in the lower moulding.
  • the inner sleeve member 28 is formed with two external grooves 42 which engage with internal flutes 44 on the cap member 30 to prevent relative rotation therebetween.
  • the inner sleeve member 28 also provides a circular rotation register and stops for the outer sleeve member 36, mounting lugs for a potentiometer 48 and a housing for a boro-silicate glass ball 50 and an associated stainless steel spring 52.
  • the outer sleeve member 36 has internal slots 54 serving as indexing detents for the spring loaded ball 50, thus ensuring that the stops 38 are aligned with a pair of fins 40 each time the outer sleeve member 36 is rotated.
  • Gearing is provided on the member 36 in the form of a helical gear 46 which engages with helical pinion 56.
  • Full travel stops 58 on the outer sleeve member 36 come to bear against the ball housing at the angular limits of rotation.
  • the adjustment ring 41 at the upper end of the outer sleeve member 36 enables indexed relative rotation, through an angle up to 315 degrees, to enable any one of twelve differing length fins 40 on the interior of the ring to be aligned with the stops 38 on the cap member 30, thereby coarsely to select the piston stroke.
  • Coil spring 60 bears against a flange adjacent the lower end of the outer sleeve member 36 to thrust the moulding upwards into firm contact with a tapered thrust washer 62.
  • Reference 64 denotes an externally threaded ring member which engages in the casing 10. The upper part of this member 64 constitutes a fine adjustment ring. As the ring member 64 is screwed downwardly it forces thrust washer 62 and coarse adjustment ring 41 downwardly, thus effectively providing fine adjustment of the stop length and thereby of the piston stroke.
  • the pinion 56 is rotated in proportion to the volume set to be dispensed by the dual action of the helical gear 46 on the outer sleeve member 36.
  • the first part of the action is due to the coarse rotational adjustment of the outer sleeve member 36 effected by adjustment ring 41 and the second part of the action is due to the vertical movement of the outer sleeve member 36 effected by rotation of adjustment ring 64.
  • the helix angle of the gear causes rotation of the pinion and in the second case the gear on the outer sleeve member acts as a rack.
  • potentiometer 56 Rotation of the pinion turns the slider of potentiometer 56.
  • the potentiometer 56 provides an analogue output signal which is processed by circuitry carried on a printed circuit board 67 to provide a signal for operating the digital display 16.
  • reference 66 denotes the battery supply for the display
  • reference 67 denotes the printed circuit board carrying processing circuitry.
  • Figures 3 and 4 show the detent ball 50 engaged in indent slot number 1, and the fins 1a, 1 b aligned with the stops 38.
  • Figure 5 shows the cylindrical shape of the sleeve 36 "unfolded", revealing the relative positions of the stop fins 40, with the longest fins 12a, 12b aligned with the stops 38.
  • the operator primes the unit by pumping the cap member 30, assuming the unit has been freshly fitted to a storage jar.
  • the cap member 30 is then held down and the electronic display is switched on.
  • fine adjustment ring 64 screwed out, coarse adjustment ring 41 is then clicked round until the display indicates a slightly higher value than the amount of liquid required to be dispensed.
  • the indicated value is then brought exactly to the required amount by use of the fine adjustment ring 64, which for this purpose is screwed in.
  • the cap member 30 is then pulled up to the maximum stroke permitted in order to draw the required amount of liquid upwardly through the open valve 72, 74 and into the cylinder 20.
  • the indicated amount of liquid is dispensed, in the manner of a pipette, through the open valve 76 and 78 and the delivery tube 14.
  • the electronic display is switched off by switch 18.

Landscapes

  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
EP87304446A 1986-06-18 1987-05-19 Improvements in or relating to liquid dispensers Withdrawn EP0250095A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868614850A GB8614850D0 (en) 1986-06-18 1986-06-18 Liquid dispensers
GB8614850 1986-06-18

Publications (2)

Publication Number Publication Date
EP0250095A2 true EP0250095A2 (de) 1987-12-23
EP0250095A3 EP0250095A3 (en) 1988-08-10

Family

ID=10599665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304446A Withdrawn EP0250095A3 (en) 1986-06-18 1987-05-19 Improvements in or relating to liquid dispensers

Country Status (2)

Country Link
EP (1) EP0250095A3 (de)
GB (1) GB8614850D0 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326022A1 (de) * 1988-01-25 1989-08-02 WALTER GRAF u. CO. GMBH & CO. Dispenser
WO1991016974A1 (en) * 1990-05-04 1991-11-14 Biohit Oy Procedure for filling and emptying a pipette, and pipette
US7105130B2 (en) 2000-10-11 2006-09-12 Thermo Electron Oy Adjustable pipette
WO2008068013A3 (de) * 2006-12-07 2008-09-18 Brand Gmbh & Co Kg Flaschenaufsatzgerät zur handhabung von flüssigkeiten
WO2008113611A1 (de) * 2007-03-22 2008-09-25 Eric Schliemann Verfahren und vorrichtung zum dosierten ausbringen eines mediums
CN101652183B (zh) * 2006-12-07 2013-03-20 普兰德有限两合公司 用于处理液体的瓶子套装器具
US8597593B2 (en) 2006-12-07 2013-12-03 Brand Gmbh + Co Kg Bottle top dispenser for handling liquids
DE202015000523U1 (de) * 2015-01-23 2016-04-27 Brand Gmbh + Co Kg Ausstoßleitungsanordnung für ein Flaschenaufsatzgerät
CN105819085A (zh) * 2015-01-23 2016-08-03 普兰德有限两合公司 用于瓶罩器的排出管路装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805998A (en) * 1972-11-17 1974-04-23 M Croslin Dispensing pipette
GB2001127A (en) * 1977-07-18 1979-01-24 Oxford Lab Jar mounted pipettors
DE3221438A1 (de) * 1981-06-09 1982-12-23 Pharmed S.A., Luxemburg Vorrichtung zum entnehmen einer bestimmten fluessigkeitsmenge aus einem behaelter
US4399712A (en) * 1981-02-09 1983-08-23 Nichiryo Co., Ltd. Semi-automatic electro-mechanical pipette with controlled tip remover
EP0096088A2 (de) * 1982-06-04 1983-12-21 Rudolf Brand GmbH & Co. Flaschenaufsatzkolbenbürette
EP0155087A2 (de) * 1984-03-12 1985-09-18 Baxter Travenol Laboratories, Inc. Handgehaltene Pipette mit wegwerfbarem Kapillar

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805998A (en) * 1972-11-17 1974-04-23 M Croslin Dispensing pipette
GB2001127A (en) * 1977-07-18 1979-01-24 Oxford Lab Jar mounted pipettors
US4399712A (en) * 1981-02-09 1983-08-23 Nichiryo Co., Ltd. Semi-automatic electro-mechanical pipette with controlled tip remover
DE3221438A1 (de) * 1981-06-09 1982-12-23 Pharmed S.A., Luxemburg Vorrichtung zum entnehmen einer bestimmten fluessigkeitsmenge aus einem behaelter
EP0096088A2 (de) * 1982-06-04 1983-12-21 Rudolf Brand GmbH & Co. Flaschenaufsatzkolbenbürette
EP0155087A2 (de) * 1984-03-12 1985-09-18 Baxter Travenol Laboratories, Inc. Handgehaltene Pipette mit wegwerfbarem Kapillar

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326022A1 (de) * 1988-01-25 1989-08-02 WALTER GRAF u. CO. GMBH & CO. Dispenser
WO1991016974A1 (en) * 1990-05-04 1991-11-14 Biohit Oy Procedure for filling and emptying a pipette, and pipette
US5343769A (en) * 1990-05-04 1994-09-06 Biohit Oy Procedure for filling and emptying a pipette, and pipette
US7105130B2 (en) 2000-10-11 2006-09-12 Thermo Electron Oy Adjustable pipette
US8142738B2 (en) 2006-12-07 2012-03-27 Brand Gmbh + Co Kg Bottle top dispenser for handling liquids
WO2008068013A3 (de) * 2006-12-07 2008-09-18 Brand Gmbh & Co Kg Flaschenaufsatzgerät zur handhabung von flüssigkeiten
CN101652183B (zh) * 2006-12-07 2013-03-20 普兰德有限两合公司 用于处理液体的瓶子套装器具
US8597593B2 (en) 2006-12-07 2013-12-03 Brand Gmbh + Co Kg Bottle top dispenser for handling liquids
EP2799141A3 (de) * 2006-12-07 2015-01-21 Brand Gmbh + Co Kg Flaschenaufsatzgerät zur Handhabung von Flüssigkeiten
WO2008113611A1 (de) * 2007-03-22 2008-09-25 Eric Schliemann Verfahren und vorrichtung zum dosierten ausbringen eines mediums
US8826750B2 (en) 2007-03-22 2014-09-09 Slg Pharma Gmbh & Co. Kg Method and device for the metered dispensing of a medium
USRE46721E1 (en) 2007-03-22 2018-02-20 Stevanato Germany Gmbh Method and device for the metered dispensing of a medium
DE202015000523U1 (de) * 2015-01-23 2016-04-27 Brand Gmbh + Co Kg Ausstoßleitungsanordnung für ein Flaschenaufsatzgerät
CN105819085A (zh) * 2015-01-23 2016-08-03 普兰德有限两合公司 用于瓶罩器的排出管路装置
CN105819085B (zh) * 2015-01-23 2019-07-30 普兰德有限两合公司 用于瓶罩器的排出管路装置

Also Published As

Publication number Publication date
EP0250095A3 (en) 1988-08-10
GB8614850D0 (en) 1986-07-23

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Inventor name: GAYLOR, IAN MICHAEL DAINES