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WO2012069969A1 - Appareil de dosage - Google Patents

Appareil de dosage Download PDF

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Publication number
WO2012069969A1
WO2012069969A1 PCT/IB2011/055176 IB2011055176W WO2012069969A1 WO 2012069969 A1 WO2012069969 A1 WO 2012069969A1 IB 2011055176 W IB2011055176 W IB 2011055176W WO 2012069969 A1 WO2012069969 A1 WO 2012069969A1
Authority
WO
WIPO (PCT)
Prior art keywords
barrel
plunger
metering device
rear end
conduit
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/IB2011/055176
Other languages
English (en)
Inventor
Robert Pattison-Emms
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2012069969A1 publication Critical patent/WO2012069969A1/fr
Priority to ZA2012/05977A priority Critical patent/ZA201205977B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
    • G01F11/025—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type with manually operated pistons
    • G01F11/027—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type with manually operated pistons of the syringe type

Definitions

  • THIS invention relates to a metering device.
  • a specific volume of a liquid material from a container, either as a sample of specific volume or for subsequent mixture with another substance in order to create a mixture having a desired concentration.
  • a farmer may often be required to dilute a specific volume of a concentrated, possibly toxic, liquid chemical, such as a herbicide or pesticide, in a given volume of a diluent, such as water, in order to create an aqueous herbicide or pesticide having a concentration suitable to achieve a specific objective when applied to the land or crops.
  • a metering device comprising a transparent, hollow barrel with a central axis, a front end including a conduit connection point and an open rear end, a plunger which is visible in the barrel and movable axially in the barrel and which has a closed front end carrying a seal which makes sliding, sealing engagement with the barrel, a hand-engagable open rear end and an internal storage space in the plunger extending to the open rear end, a withdrawal/delivery conduit which is connectable to the front end of the barrel so as to project forwardly from the barrel and which can be stored in the storage space in the plunger when it is not so connected, and a closure for closing the rear end of the plunger thereby to close the storage space.
  • the barrel typically has an internal volume, which can be swept by the front end of the plunger during movement thereof in the barrel, of at least 500ml, preferably at least 600ml.
  • connection point for the withdrawal/delivery conduit is spaced from the central axis of the barrel.
  • the hand-engagable rear rear end of the plunger conveniently includes a manually grippable, roughened zone. This may for example be externally ribbed and/or knurled to facilitate manual gripping.
  • the withdrawal/delivery conduit may comprise a rigid tube having a rear end connectable to the conduit connection point at the front end of the barrel and an open front end.
  • the rigid tube preferably has a chamfered or beveled front end.
  • the withdrawal/delivery conduit may be at least partially flexible or it may comprise a plurality of rigid sections connectable end to end with one another.
  • the plunger is made of an opaque material and visible volumetric graduations are provided both on the barrel and on the plunger to indicate a volume within the barrel forwardly of the front end of the plunger at each position of the plunger relative to the barrel.
  • the device may include a monitor operable to provide a digital readout of a volume within the barrel forwardly of the front end of the plunger at each position of the plunger relative to the barrel.
  • the plunger is preferably substantially cylindrical throughout and the rear end of the barrel preferably carries a relatively enlarged collar, possibly including a flange with flat edges at diametrically opposite positions.
  • the flange preferably has a maximum transverse dimension selected such that the flange cannot pass through a dispensing opening of a 210 litre drum.
  • a method of dosing a known volume of water in a mixing container with a required volume of an agrochemical stored in a chemical container comprising the steps of providing a metering device according to any one of claims 1 to 14, inserting the withdrawal/delivery conduit of the device into the agrochemical in the chemical container with the plunger of the device fully inserted into the barrel of the device, applying traction to the rear end of the plunger in order to draw the plunger rearwardly in the barrel such that a predetermined volume of agrochemical is drawn from the chemical container into the barrel, directing the conduit into the mixing container and pushing the plunger into the barrel in order to deliver a predetermined volume of agrochemical from the barrel into the mixing container, the predetermined volume in each case being determined with reference to volumetric graduations on the barrel or plunger, or with reference to a readout provided by a digital monitor, as the case may be.
  • Figure 1 shows an exploded, rear perspective view of a metering device according to the invention
  • Figure 2 shows a side view of the assembled metering device
  • Figure 3 shows a front view of the metering device
  • Figure 4 shows a longitudinal cross-sectional view of the metering device taken at the line 4-4 in Figure 3.
  • the illustrated metering device 10 includes a hollow barrel 2 with a round cylindrical side wall 14, a front wall 16 and an open rear end 18.
  • the barrel 12 is moulded in one piece of a transparent, suitably chemically resistant polypropylene and includes, at its rear end 18, an enlarged collar 20.
  • the collar 20 includes a flange 22 with diametrically opposed, flat edges 23.
  • a hollow threaded socket 24 typically of stainless steel.
  • the socket 24 is offset from the central axis 26 of the barrel, close to the side wall 14.
  • the metering device 10 also includes a plunger 28 which is substantially of round cylindrical form throughout and which has a closed front end 30, an open rear end 32 and an internal, blind bore 34 which extends to the rear end and which forms an internal storage space 35. Close to the front end 30 of the plunger 28 there is an annular groove in the plunger which accommodates a double lip seal 33 dimensioned to make sliding, sealing contact with the internal surface of the wall 14 of the barrel when the front end of the plunger is inserted into the barrel.
  • the plunger is moulded in one piece of an opaque, dark and typically black polypropylene. Externally, the rear end of the plunger is formed with a handle 37 with a rough profile, in the illustrated case provided by spaced ribs 36 and a knurled finish 38 between the ribs. The rear end of the plunger also carries an annular rib 40.
  • a closure in the form of a cap 42 which is designed to fit over the open rear end 32 of the plunger and make clipping engagement with the rib 40, thereby to close the storage space.
  • the closure could be in form of a plug having a spigot portion which fits into the open open rear end 32 of the plunger.
  • the metering device 10 also includes a withdrawal/delivery conduit 44.
  • the illustrated conduit 44 incorporates a straight, rigid tube 46 of stainless steel with a chamfered or bevelled front end 47 and a threaded nipple 48 at its rear end by means of which it can be connected to the barrel 14 by screwing the nipple 48 into the socket 24, thereby placing the bore of the conduit in fluid communication with the interior of the barrel.
  • An O-ring 49 provides a seal between the conduit 44 and the front end of the barrel.
  • the total length of the conduit 44 is less than the axial length of the storage space 35 in the plunger so the conduit can, when not in use, be disconnected from the barrel and placed in the storage space as shown in broken outline in Figure 4.
  • the cap 42 can then be fitted to the rear end of the plunger to enclose the conduit.
  • the wall 14 of the barrel is marked with volumetric graduations 50.
  • the wall of the plunger 28 is marked with volumetric graduations 52.
  • the marks representing the graduations 50 and 52 are typically recessed, during moulding, into the cylindrical surface of the barrel or plunger.
  • a typical application of the metering device is in agriculture where the device may be used to dose a predetermined volume of water with a predetermined volume of a concentrated agrochemical treatment liquid, for example a herbicide or pesticide.
  • a concentrated agrochemical treatment liquid for example a herbicide or pesticide.
  • the conduit 44 is extracted from the storage space 35 after removing the cap 42, and is connected to the front end of the barrel as described previously.
  • the plunger 28 is pushed fully into the barrel 14 so that its front end 30 butts up against the front end of the barrel.
  • the operator grips the barrel in one hand and the handle 37 in the other hand and inserts the conduit into the dosing liquid.
  • Dosing liquids such as concentrated herbicide or pesticide are frequently contained in standard -20 litre chemical containers.
  • the diameter of the barrel may be such that it cannot enter the dispensing opening of such containers.
  • the length of the conduit 44 is such that its tip can reach to the bottom of the container when the front end 16 of the barrel abuts the mouth of the dispensing opening.
  • the dimensions may be such that the barrel can fit through the dispensing opening of the container, but the flange 22 has a maximum transverse dimension greater than the diameter of the opening and so preventing the barrel from falling into the container.
  • the conduit 44 is withdrawn from the container and the device 10 is transported to a container in which the liquid concentrate is to be mixed with water. With the conduit pointing into the latter container, the operator pushes the plunger forwardly, in the direction indicated by the arrow 49 in Figure 2, to drive the liquid contents of the barrel into the mixing container. If the plunger is pushed fowardly with sufficient force, the liquid is expelled under some pressure and at a substantial velocity, which will assist in mixing the liquids.
  • volume of concentrate drawn into the barrel might be a multiple of the dose required for each mixing container, in which case the operator can then dispense the required dose into each container, again with reference to the volumetric graduations 50.
  • the conduit 44 can be disconnected from the barrel and replaced and enclosed in the storage space 35 in the plunger after, if necessary, a suitable cleaning operation.
  • the caps 42 of different devices could be of different colours to indicate the different chemicals for which they are intended.
  • the cap or any other suitable, visible part of the device could carry a label or include an area on which the relevant chemical could be identified in writing.
  • the graduations 50 may be very close to one another. For this reason, it is preferred to stagger the graduations circumferentiaily on the barrel as shown in the drawings, since this will facilitate accurate visual alignment of the front end of the plunger with any given graduation.
  • the dosing liquid has a dark colour similar to that of the plunger itself, it may be difficult to determine accurately the position of the front of the plunger as it is withdrawn into the barrel.
  • the calibrated graduations 52 on the plunger may be consulted instead of the graduations 50 on the barrel.
  • the calibration will be such that the operator can monitor the volume drawn into the barrel by visually aligning a flat edge 23 of the collar 20 with the graduations.
  • the graduations 52 which it carries may be white or of another light colour. These graduations are typically staggered in a manner similar to the graduations 50.
  • the device 10 may also include an electronic, typically vernier-type digital monitor.
  • the numeral 60 diagrammatically illustrates an LCD or other digital readout display.
  • the monitor will typically provide instantaneous volumetric indications, for example in milliliters or fluid ounces, in response to a linear transducer device with components embedded in the plunger and in the barrel.
  • the monitor will also typically include a small battery and an appropriate on/off control. It will be understood that the plunger 28 is longer than the barrel such that the handle 37 will always project from the barrel, even when the plunger is fully inserted into the barrel.
  • the handle 37 being essentially an axial extension of the remainder of the plunger and having a similar lateral dimension to the remainder of the plunger, is preferred to an arrangement in which the handle is, for example, T-shaped, since it allows the device 10 to be stacked compactly with other similar devices. It is also considered that it will be particularly easy and comfortable for an operator to grip the illustrated handle, particularly when the operator is wearing protective gloves.
  • the dosing liquid which is drawn into the barrel during a sampling or dosing operation may be toxic or otherwise hazardous.
  • the plastic material of which the components of the device 10 re made should be appropriately chemically resistant to attack by the dosing liquid.
  • the seal 33 might be made of Viton®, where less corrosive liquids are to be handled it might be of nitrite and where food products are to be handled it might be of silicone rubber.
  • the seal may be of neoprene or PTFE (polytetrafluoroethylene).
  • the seal 33 could be provided by a simple O-ring of appropriate material.
  • the device 10 will provide for easy and safe sampling and dosing operations to be carried out, even when the liquid is of a hazardous nature, since there will in the normal course be no contact at all between any part of the operator's body and the liquid. If, for example, the operator should inadvertently draw too much liquid into the barrel, it will be a simple matter to dispense the excess back into the container, merely by depressing the plunger through the required distance, as indicated by the graduations 50 or 52 and/or by the digital monitor.
  • the conduit 44 has a small diameter which enables it to enter small necked containers. As indicated above, the diameter of the barrel can be such as to prevent the barrel itself from entering a typical, standard 20 litre container.
  • the rigid conduit 44 may be replaced by a flexible or telescopically extendable conduit which is capable of reaching the bottom of the drum but which can still be stored in the plunger when not in use.
  • the conduit 44 could include one or more rigid sections and one or more flexible sections, attachable to the rigid section(s).
  • the major lateral dimension of the collar 20 is selected to be greater than the diameter of the dispensing opening of standard drums of this capacity, so while it is impossible for the barrel and plunger to fall into the drum, it will still be possible to withdraw liquid from it.
  • conduit 44 could be supplied in rigid sections which can be connected end to end with one another to create the required length, with each individual section being short enough to be accommodated in the storage space 35 in the plunger when not in use.
  • the device 10 will find particular application in agricultural, industrial and other applications where the dosed volumes will be quite large.
  • the design is such that a volume of 500ml or more can be accommodated in the barrel when the plunger is withdrawn.
  • the volume accommodated may be 600ml or more, possibly with the graduations 50 and 52 providing 5ml increments.
  • the plunger may be pulled right out of the barrel. This, combined with the overall simplicity of the design, means that it is a simple matter to disassemble and clean the individual components when required. Where sterilization is required, the materials of which the components are made should be capable of withstanding autoclave treatment, in practice, it would also be possible to perform a simple flushing operation by moving the plunger back and forth with the conduit 44 in the dilute mixture or in clean water or other cleaning liquid.
  • the chamfer or bevel at the front end 47 of the illustrated conduit 44 enables it to draw up liquids right from the bottom of a container, i.e. when the container is virtually empty.
  • conduit is connected to the barrel at a position off-set from the axis
  • the operator merely has to hold the device 10 with the conduit 44 pointing upwardly and the barrel orientated such that the socket 24 is at the top, tilt the device such that the air bubble lies beneath the socket 24 and then depress the plunger slightly to expel the air through the conduit.
  • the conduit were connected to the barrel on the central axis, it would be necessary to tilt the device to a vertical orientation in order to bring the bubble to the correct spot, whereas with the offset conduit it is only necessary to tilt it through a smaller angle.
  • a further advantage of the illustrated embodiment is provided by the flat edges 23 of the collar 20. These flat edges will prevent the device 10 from rolling about its axis if placed on a flat surface.
  • the rigid, stainless steel conduit 44 has a total length of 340mm with an outside diameter (OD) of 8mm and an inside diameter (ID) of 6mm.
  • the barrel 12 has an overall length of 458mm, an OD of 54mm and an ID of 45mm, and the plunger 28 has an overall length of 560mm with an OD of 45mm and an ID of 30mm.
  • the flange 22 can have a maximum transverse dimension greater than the diameter of the standard container opening to prevent the barrel from falling into the container.
  • the opening typically has a diameter of about 50mm and the maximum flange dimension, indicated by the numeral 70 in Figure 3 may, for example, be about 80mm.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Catching Or Destruction (AREA)

Abstract

L'invention concerne un appareil de dosage (10) qui peut être utilisé, dans une application, pour préparer des concentrations aqueuses précises de produits agrochimiques, tels que des pesticides ou des herbicides. L'appareil comporte un baril creux transparent (12) ayant un axe central, une extrémité avant (16) comprenant un point de raccordement à une conduite et une extrémité arrière ouverte (18). Le baril contient un piston (28) visible qui peut se déplacer axialement et qui possède une extrémité avant fermée (30) portant un joint d'étanchéité (33) qui forme un contact étanche et coulissant avec le baril. En outre, l'appareil comporte une extrémité arrière ouverte (37) pouvant être prise par la main et un espace de stockage interne (35) se prolongeant vers l'extrémité arrière ouverte. Une conduite de soutirage/distribution (44) peut être raccordée à l'extrémité avant du baril afin qu'elle se projette vers l'avant à partir du baril. Cette conduite peut être stockée dans l'espace de stockage du piston quand elle n'est pas utilisée. Une fermeture (42) sert à fermer l'extrémité arrière du piston pour ainsi fermer l'espace de stockage.
PCT/IB2011/055176 2010-11-22 2011-11-18 Appareil de dosage Ceased WO2012069969A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2012/05977A ZA201205977B (en) 2010-11-22 2012-08-08 Metering device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2010/08361 2010-11-22
ZA201008361 2010-11-22

Publications (1)

Publication Number Publication Date
WO2012069969A1 true WO2012069969A1 (fr) 2012-05-31

Family

ID=46145432

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/055176 Ceased WO2012069969A1 (fr) 2010-11-22 2011-11-18 Appareil de dosage

Country Status (2)

Country Link
WO (1) WO2012069969A1 (fr)
ZA (1) ZA201205977B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016077470A3 (fr) * 2014-11-11 2016-07-07 Loritz Kenneth Anthony Seringue à l'épreuve des enfants
JPWO2015156183A1 (ja) * 2014-04-07 2017-04-13 ニプロ株式会社 シリンジ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB728983A (en) * 1952-07-18 1955-04-27 Seringues Ind S E S I Soc D Ex Improvements in and relating to hypodermic syringes made of injection moulded plastic material
FR2687578A1 (fr) * 1992-02-26 1993-08-27 Dutartre Daniel Dispositif pour augmenter la precision des seringues.
US5944693A (en) * 1998-08-17 1999-08-31 Jacobs; Warren A Syringe assembly and associated syringe biasing device
US20060084925A1 (en) * 2004-10-20 2006-04-20 Ramsahoye J W M Medical syringe with colored plunger and transparent barrel assembly
EP1886728A2 (fr) * 2006-08-09 2008-02-13 Eppendorf Ag Dispositif de dosage électronique destiné au dosage de liquides
US20090178725A1 (en) * 2008-01-11 2009-07-16 Troy Sonnier Apparatus for extracting, measuring and transferring fluids

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB728983A (en) * 1952-07-18 1955-04-27 Seringues Ind S E S I Soc D Ex Improvements in and relating to hypodermic syringes made of injection moulded plastic material
FR2687578A1 (fr) * 1992-02-26 1993-08-27 Dutartre Daniel Dispositif pour augmenter la precision des seringues.
US5944693A (en) * 1998-08-17 1999-08-31 Jacobs; Warren A Syringe assembly and associated syringe biasing device
US20060084925A1 (en) * 2004-10-20 2006-04-20 Ramsahoye J W M Medical syringe with colored plunger and transparent barrel assembly
EP1886728A2 (fr) * 2006-08-09 2008-02-13 Eppendorf Ag Dispositif de dosage électronique destiné au dosage de liquides
US20090178725A1 (en) * 2008-01-11 2009-07-16 Troy Sonnier Apparatus for extracting, measuring and transferring fluids

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2015156183A1 (ja) * 2014-04-07 2017-04-13 ニプロ株式会社 シリンジ
WO2016077470A3 (fr) * 2014-11-11 2016-07-07 Loritz Kenneth Anthony Seringue à l'épreuve des enfants
US10478567B2 (en) 2014-11-11 2019-11-19 Kenneth Anthony Loritz Child resistant syringe

Also Published As

Publication number Publication date
ZA201205977B (en) 2013-10-30

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