IE52625B1 - Method of and device for dispensing viscous concentrates of variable viscosity in accurately metered quantities of variable volume - Google Patents

Method of and device for dispensing viscous concentrates of variable viscosity in accurately metered quantities of variable volume

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Publication number
IE52625B1
IE52625B1 IE476/82A IE47682A IE52625B1 IE 52625 B1 IE52625 B1 IE 52625B1 IE 476/82 A IE476/82 A IE 476/82A IE 47682 A IE47682 A IE 47682A IE 52625 B1 IE52625 B1 IE 52625B1
Authority
IE
Ireland
Prior art keywords
volume
pumping
hollow
section
dispensing
Prior art date
Application number
IE476/82A
Other versions
IE820476L (en
Original Assignee
Dagma Gmbh & Co
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 Dagma Gmbh & Co filed Critical Dagma Gmbh & Co
Publication of IE820476L publication Critical patent/IE820476L/en
Publication of IE52625B1 publication Critical patent/IE52625B1/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00Apparatus 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
    • G01F11/02Apparatus 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
    • G01F11/08Apparatus 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 diaphragm or bellows type
    • G01F11/082Apparatus 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 diaphragm or bellows type of the squeeze container type

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Devices For Dispensing Beverages (AREA)
  • Reciprocating Pumps (AREA)
  • Beverage Vending Machines With Cups, And Gas Or Electricity Vending Machines (AREA)

Abstract

A pump has a pumping chamber defined by a flexible or resilient cylindrical chamber wall 15, and non-return inlet and outlet valves 14, 25. Pumping is effected by aerial deformation of the pumping chamber, by electro-magnetic actuating means 5. The liquid to be dispensed, is stored in collapsible container 2.

Description

This invention relates to a method of and a device for dispensing viscous concentrates of variable viscosity in accurately metered quantities of variable volume in which cyclic variations of the pumping volume of a hollow body made of a flexible or elastically deformable material cause said concentrate to be drawn in from the storage volume of a container via a non-return valve and to be discharged on the output side.
There have been known a variety of metering pumps in the 10 form of discharging sections provided with two non-return valves, one of which functions as an inlet valve, the other one functioning as an outlet valve. For example, there has been disclosed in Patent Specification No.aioio a metering pump in which the discharge section is 15 formed by a flexible tube which 1s adapted to be closed by the application of a radial squeezing pressure by means of an actuatingdeviceand which tends again to assume its full open cross-section upon said actuating device being released. Opening of the inlet valve or the outlet valve, respectively, iseffected by pressurechanges caused in said discharge portion. Such a device is not only hard to -3manipulate properly but permits only a relatively inaccurate metering effect to be obtained. Therefore, such devices may be considered suitable for use with soap dispensers and the like in which metering accuracy is not at a premium. Besides, the means serving to operate said discharge section are extremely complicated and expensive.
It has further been known to provide a discharging section with a radially outwardly projecting bellows-like fold which is adapted to be compressed in an axial direction between a pair of plate-shaped actuating elements so as to serve the function of a metering pump. In this case it is also possible to construct the discharging section as a rubber bellows which has associated therewith suitable beak-like rubber valves forming non-return valves (cf. United States Patent Specification No. 25 54 570). This known device also occupies considerable space and is, therefore, not suitable for installation in vending machines or the like. The metering volume of this known device is also relatively inaccurate so that it is extremely difficult to ensure accurate metering.
Where it is desired to dispense metered quantities of certain highly viscous concentrates, an extremely accurate metering operation is necessary. In view of the fact that in certain applications, such as beverage vending machines, extremely little space is available for mechanical equipment, it is necessary to provide a metering device which is of as compact design as possible. A particularly serious problem arises from the fact that concentrates . of perishable organic substances pose great difficulties as regards the maintenance of hygienic conditions, particularly in cases in which the metering device and/or accessories thereof may be contaminated by drops of such substances. If all hygienic requirements are to be met, TO the.necessary maintenance.operations and frequent cleaning _ of component parts prove to be extremely difficult and time-consuming, it being necessary to provide for constant supervision of such operations.
In the prior-art metering devices comprising a peristaltic 15 pump or a similar tube-shaped discharging section, only a relatively small restoring force is produced upon the . elastic tube material being subjected to small amounts of deformation. The restoring force is not increased sufficiently unless a major amount of deformation is caused. However, the magnitude of the restoring force also affectstheaccurate reproduceability of.the' deformation and thus the accuracy of the metering operation. Therefore, these known devices are only adapted to dispense relatively large volumes of the concentrate, and the frequency with which metering cycles can be -5performed is relatively low. The term relatively large volumes is understood to mean, for example, volumetric quantities of 0.4 cubic centimeters. Nor is it possible to prestress or bias a filled flexible tube section in its initial position because it is necessary to thread the tube sections into an actuating device such as peristaltic pump, it being necessary to avoid any deformation in order to prevent any drops of liquid.
Another important factor tending to impair the metering accuracy of such known devices resides in the fact that, during a decrease in the pumping volume, the tube-shaped discharging section is subjected to uncontrollable additional deformation caused by the increased pressure occuring within said section. Such uncontrollable variations may only be tolerated where a relatively large metering volume is discharged during each cycle so that the influence of such variations remains small.
In view of the foregoing, it is an object of this invention to improve the method described above as well as the device for practicing said method in such a way as to avoid the disadvantages thereof and to enable even extremely small quantities of a concentrate to be dispensed in an extremely accurate manner and at a high cycling frequency. It is a further object of this invention to provide a device for practicing the method which is of 26 2 5 extremely compact construction so as to permit it to be easily accommodated in a small space, for example, in a beverage vending machine, or to permit the device to be installed in existing vending machines.
This object is attained by the provision of the method having the features defined in Claim 1, the method of the invention being capable of being practiced by means of a device having the features defined inClaim4.
Hence, it is possible to produce a pumping effect by 10 decreasing in ah axial direction a cylindrical pumping volume which is supported in a shape-maintaining manner during the volume reducing operation with the result that uncontrollable deformation due to the increasing pumping pressure and changes in the metering volume are avoided.
In this manner it is possible toprovide an extremely high degree of precision of the metering operation even in cases in which extremely small quantities are dispensed per metering cycle. The axial compression of the cylindrical metering volume makes it possible for the hollow cylindrical body defining the pumping volume to be subjected in its initial position to a presettable axial bias in the sense of an increase i.n said volume. This results in the provision of sufficiently large restoring forces even with changes in volume of minimum magnitude. Moreover,this -7axial compression of the pumping volume in conjunction with the extremely high accuracy capable of attainment even with extremely small metering volumes makes it possible to provide a frequency of metering cycles which is in agreement with the power mains frequency, i.e. a frequency of 50 to 60 Hz. This high cycling frequency and the smallness of the quantities capable of being metered make it possible to vary the total quantity to be discharged to be selected within a large range of adjustment simply by suitably controlling the number of metering pulses per unit time. This method of control can be implemented in an extremely simple and reliable manner with mains-frequency controlled devices.
Despite the bias which exists in the inoperative position of the pumping volume, the discharging section can be easily and reliably threaded into the actuating means without drops of liquid being dispensed in an undesired manner. At the same time the hygienic problems are completely avoided which might otherwise be caused by contamination of the device. In addition, the arrangement just described may be improved considerably by enclosing all components which are of importance as regards reliable functioning of the device in a rigid guiding tube which is either permanently or releasably connected to a container for shipping, storage and dispensing of the liquid, said container preferably being a single-use product. 2625 The highcycling frequency of the device thus permits the liquid to be dispensed in the form of an almost continuous flow or stream with the aid of a train of rapidly repeated metering cycles .with the length of the said train being capable of being adjusted to suit requirements.
The sleeve-shaped body of the device need only be of flexible nature, it being possible, by the addition of suitable elements such as spring elements or the like, to provide for the necessary bias and restoring action. In a preferred embodiment, however, the sleeve body is made of a shape-retaining elastic material and secured to rigid hub-shaped bodies of said non-return valves.
The small dimensions of the dispensing section makes it possible to install the device in a vending machine in which extremely little space is available. An additional advantage of the device of the invention makes it possible to modify existing metering devices by the addition of an electromagnetic annular coil forthepurpose of Λ substituting a quantity controlled or volume controlled metering method for the time controlled, metering method described where time controlled metering would result in undesirable fluctuations of accuracy due to changes in the viscosity of the liquid. The metering accuracy of the device of the invention is not affected by such variatiohs 9in consistency.
The invention and further particulars will be described more specifically hereinafter with reference to a preferred embodiment shown in the drawings, in which:5 Figure 1 is an axial cross-sectional view of a container for the storage, transportation and dispensing of a liquid, the container being provided with a dispensing section according to the invention; Figure 2 is an enlarged exploded cross-sectional view of the component parts of the dispensing section; and Figure 3 is an enlarged cross-sectional view of a modified embodiment of the dispensing section.
Preferably the device of the invention is manufactured in the form of a single-use container which is adapted to store, transport and dispense metered quantities of a liquid. Preferably, the dispensing section is permanently secured to the container during manufacture thereof and is discarded together with the container after use. Thus, the container constitutes a mass-produced item. 26 25 Said container may comprise an external envelope and an interior flexible bag adaptedto contain theliquid and to collapse as liquid is being withdrawn. With this construction, it is not necessary to introduce air into the container to permit liquid to be dispensed. However, it would also be possible to provide ah essentially rigid container with which ventilating means are associated which are adapted to be actuated for the purpose of f dispensing liquid.
It should be understood that the container is preferably intended for the reception, storage and transportation as well asthe dispensing oforganic concentrates.
In the embodiment shown in Figure 1 thecontainer comprises, an external envelope 1 and a flexible and collapsible .15 liquid-receiving container 2 which latter is provided with a mouthpiece 3 to which the dispensing section 4 is preferablypermanently attached.; In Figure 1 the container is shown in the inverted position in which it is held when it is intended to dispense metered quantities of a liquid.
In this position, the dispensing section 6 extends through . the central aperture of an electromagneticannular coil5 which may, for example, be fixedly installed in an automatic beverage vending machine. The electromagnetic annular ceil 5 is connected .to suitable control means whichi make it -11possible, for example, to operate the electromagnetic annular coil 5 at the power mains frequency with the number of oscillations coil 5 is desired to follow being adjusted with the aid of said control means.
Dispensing section 4 comprises a rigid tubular guide member 6 made of a plastic material, the upper end of which is permanently secured to mouthpiece 3 of the container. As shown in Figure 2, tubular guide member 6 is provided with a free cross-section through a major part of its length forming an enlarged portion extending downwardly from an annular shoulder 35. The tubular guide member 6 has associated therewith a rigid cover member 25 at its lower end, this cover member being provided with a central discharge spigot 27. In the embodiment shown the two members 6 and 26 of the tubular guide member are interconnected by a hub-shaped valve body 20 which is provided with an external annular flange 22 serving as an abutment up to which the tubular guide member and the cover member 26 may be slid over the valve body so as to hold the members in position. In this arrangement, the hubshaped valve body 20 is rigidly connected to both the tubular guide member 6 and the cover member 26.
Another similar hub-shaped valve body 8 is received with clearance by the larger-diameter portion of guide member 6 S3 625 so as to be capable of freely movingin an axial direction : within guide member 6. A spigot-shaped terminal portion of valve body 8 made of a plastic material facing container 1 in an upward direction has attached thereto a magnetizable sleeve member 7 forming an annular, armature, the lower annular shoulder of said sleeve member bearing against shoulder 9 of the valve body 8. Thus, valve body 8 and annulararmature7 constitute a rigid unit which is axially movable upwardly, and downwardly within guide member 6 as indicated by the double-headed arrow 31. .
The mutually facing ends of valve bodies 8 and 20 are provided with receiving and mounting portions 10, 11 and λ. 19, 21, respectively, for the sleeve-shaped end portions 16 and 18 of a hollow cylindrical body 15. In the embodiment . 15 shown, body 15 is made of an elastic material so that it also serves the function of an elastic spring element. As shown in Figure 2, body 15 is provided with terminal· k portions 16 and 18 of greater wall thickness serving to. mount the two valve bodies 8 and 20 and is also provided with a radially inwardly projecting fold or bead17 of smaller thickness. Body15 connecting the hub-shaped valvebodies 8 and20 defines a predetermined metering volume between the valve bodies. The initial capacity of this volume is determined by the restoring action of body in conjunction with the internal shoulder 35 of tubular -13guide member 6 on which the annular upper end face of annular armature 7 bears in the rest position.
In the embodiment shown, each of the valve bodies 8 and 20 is provided with a central bore 12 and 24, respectively, into which there may be spring-fitted a shaft portion of a valve element 14 or 25, respectively, said valve elements being of mushroom shape and made of an elastic material.
A tapered enlargement provided on the free end of each mushroom shaped portion serves to lock the valve element to its associated hub-shaped valve body. The lip-shaped peripheral edge of the dish-shaped head portion of valve element 14 or valve element 25, respectively, is caused by the variable pressure to which it is subjected to bear sealingly against the adjacent inner end face of the respective hub-shaped valve body 8 or 20. The inner portions of said valve bodies are provided with a plurality of passages 13 and 23, respectively, each plurality forming a circular arrangement, said passages permitting liquid to enter the metering space and to be discharged therefrom, respectively. Under static conditions, the elastic bias produced by the material of the mushroom-shaped valve elements 14 and 25 is sufficient to prevent liquid from flowing through passages 13 and 23. Only with pressure variations exceeding such static conditions will the lip25 shaped peripheral edges of the dish-shaped head portions 52€ 2 5 : -14of the valve elements be lifted off the central end faces of said hub-shaped valve bodies 8 and 20 so as to permit liquid to flow through said passages.
The stroke length of the assembly formed by valve body 8 5 and annular armature 7in an upward direction is limited by the internalshoulder 35of tubular guide member 6. In a downward direction the stroke length of said assembly is 1imited by the fact that during such downward motion the lower edge of portion 10 of the hub-shaped valve body 8 comes into contact with the annular upper edge of portion 21 of hub-shaped valve body 20. Without the design of this arrangement being changed, it is possible by suitably selecting the length of portions 10 and 21easilyand accurately to adjust the stroke length 30(Figure 1) of the movable assembly 7, 8. As valve body8approaches valve body 20, portions 10 and 21 thereof enclose the hollow cylindrical body and support it from the outside in such a manner that it cannot change its shape, the result being / that body 15 cannot be expanded in a radial direction.
Figure 1 shows the component partsof the embodiment just described approximately, in their actual size, the stroke length of/this preferredembodiment being a; little smaller thanshownat 30 in Figure 1. The liquid.volume dispensed through spigot 27 is determined: by the number of pumping/. 52635 -15strokes occurring at the power mains frequency. Therefore, this volume can be easily adjusted because the individual quantities discharged during each pumping stroke can be adjusted in an extremely accurate manner even in the case of very small increments. Within the dispensing section 4 the liquid is hermetically sealed so as to be protected against the action of atmospheric oxygen. It is seen that the arrangement described is capable of being manufactured in a simple manner and at low cost, that it operates in a very reliable manner, that its manipulation is extremely simple and safe, and that no contamination of components located in the vicinity of the device is possible.
The stroke length may also be limited by means of stop members of different construction which are provided, for example, on the tubular guide member.
In order to avoid radial deformation of the hollow cylindrical body in the vicinity of the radially inwardly projecting bead 17, it may be of advantage to provide the or each bead in the area of its internally projecting ridge with a rigid supporting ring.
More specifically, it may be of particular advantage to give the ridge of the bead a helical shape. In this case ) 16- Γ ;; ; Λ ; it is possible to provide inassociation with said ridge a supporting element in the form of a helically extending spring element which is adaptedto be compressed in aft axial direction only, said spring element serving the additional function of axially biassing the hollow cylindrical body 15. In the Tatter case body 15 need not . be of a shape-elastic nature if itis made of a material . having a sufficient degree of flexibility. ; r) Under certain conditions it is possible to dispense with the non-return valve25 provided on the discharge end of the device. - :/: In this case the non-return valve at the exit of the pumping yolume is replaced by a discharge spigot which is in -2\ unobstructed connection with the pumping space. The inner is: diameter and the length of such a discharge sgigot are so: selected that the inner friction and the surface tension of the concentrate present..in the discharge: spigot suffice. : to retain the concentrate column in its axial position within the discharge spigot with the pumping volume -: remaining unchanged or being increased. The pumping volume will remain constant as long as the non-return valve at the entering end of the device is closed. With the pumping volume being increased, concentratewill be withdrawn from the container and transferred into the pumping space. 2 -17In a practical embodiment of this modified device of the invention, the inner diameter of the pumping space amounted to between 8 and 12 mm. The stroke length was adapted to be adjusted between 1 and 2 mm. The stroking frequency amounted to 50 cycles per second, but it was possible to vary this frequency between 10 and 100 cycles per second without the operation of the device being impaired. The device was tested with liquids having a viscosity ranging from 1 to 100 centipoise units. The non-return valve located on the entry side was provided as passages with slots arranged on a semicircle and adapted to be covered by a small valve plate. It was found that no dripping of concentrate had to be expected with a length between 10 and 40 mm of the discharge spigot replacing the exit valve and with an inner diameter of said spigot between 1 and 3 mm.
Without the flexible body or bellows 15 being supported by the corset-like arrangement, said bellows will be subject to an irregular formation of externally curved portions, this phenomenon impairing the accuracy of the metering operation. In contrast to this, the corset-like supporting means of the invention makes it possible to maintain volumetric tolerances of hardly measurable magnitude.
Figure 3 shows a modified embodiment of the component parts 625 Λ -IS- :? defining the pumping space. /Mauated in a cylindrical housing 40, the upperend of which is adapted to be. : connected to the container for the concentrate/ is an upper sleeve member 42whichisprovided withan outwardly projecting flange at its upper end. A corresponding ; lower sleeve member 43 is provided in the lower end of housing 40and rigidly attachedto acovermember having an outlet spigot 49. In the example shown, itis assumed that the lower sleeve member43 is guided with clearance TO in the lower end of housing 40.- Also the lower sleeve member 43 is provided with an outwardly projecting flange. Between the Tower portion of housing40 and the two approximately aligned spigot sections 42 and 43 which;are made of a rigid material such as a plastic material there is provided an annular space 47. Disposed in this annular space is a spreading or biasing spring 48the ends of which bear against the flanges of sleeve members 42 and 43, said spring tending to hold the two sleevemembers in their . spread-apartposition shown in Figure 3. In theembodiment ; shown the 1ower spigot is connected to an annular armature 45 which is adapted to he actuated in such a manner by the electromagnetic operating means (notshown) that the lower spigot 43 can be raiseduntil it bears against the upper spigot 22 forthe performanceof apumping stroke.
The two opposing ends of the two spigots are sealingly interconnected bya bellowsmember' 44 which essentially -1953625 applies no forces to the spigots. With the two spigots 42 and 43 being brought into their proximate position, the fold 44 is practically closed completely.
In order to prevent air from being compressed in the 5 annular space 47 in synchronism with the pumping strokes, said annular space is ventilated to the external atmosphere via slots or drilled holes 50 which should be arranged at the minimum possible distance from the final position attained during a pumping stroke so as to provide a flow path of minimum length for the air displaced as the volume of annular space 47 is varied. Provided in the vicinity of the upper flange of spigot 42 is the inlet valve (not shown) of the pumping chamber, it being possible to provide an inlet valve which resembles the embodiment described earlier. In Figure 3 the pumping motion of the lower sleeve member 43 is indicated by the double-headed arrow 46. It would also be possible to provide an arrangement in which the two sleeve members are adapted to move towards and away from one another. The embodiment shown in Figure 3 affords the advantage that no concentrate can enter the annular space 47. The spigot 49 can be constructed in such a way that it is not necessary to associate a non-return valve to the outlet.
It will be understood that such an arrangement which is 5262 5 -20cperable independently of the elastic restoring force of a rubber bellows iscapable of metering almost paste-like media which are not adapted to be metered by means of the normally available restoring force provided by a shape5 retaining elastic body. Γη this case it willbenecessary to provide the magnetic forces in a suitable manner.: The spring force can then be determined in an analogous manner.
. The metering device of the invention is also suitable for fluids ether than syrups and the like. Particularly in the case of perishable fluids, the pump-elements employed in the single-use unit afford the advantage that it is possible ;hy suitable manufacturing methods to;limit the useful life,: for example, of the diaphragm,: with the res tri t that i 1 legal refilling of the container will cause rapid deterioration of the diaphragm soas to render; the device useless. This is an effective method of preventing hygienic problems from arising. : . - r ;

Claims (14)

1. A method of dispensing viscous concentrates of variable viscosity in accurately meterable quantities of varying volume, in which, by varying the pumping volume of 5 a hollow body made of flexible or shape-retaining resilient material in the direction of its longitudinal axis between stops, concentrate is firstly drawn in via a non-return valve at one end of the hollow body from a storage volume of a container and then is discharged at the other end of 10 the hollow body, wherein the variable portion of the pumping volume of the hollow body is selected so as to be small with respect to the smallest quantity to be dispensed; wherein during the discharge phase the hollow body is supported against changes in shape in a radially outward 15 direction and is resiliently pretensioned in its shape corresponding to its largest discharge volume in an axial direction corresponding to an increase of its pumping volume; and wherein the pumping volume is varied cyclically a plurality of times per second during each dispensing 20 operation.
2. A method as claimed in Claim 1, wherein the cyclic variation of the pumping volume is performed at the mains frequency of the electric mains supply. < ? : / -22- λ -- -ί ; ΐλ. ζ
3. A method as claimed in Claim 1, wherein the length of the pumping stroke islimited to between 1 and 2 mm.. r
4. A device fOr performihg the method of Claim 1, having adispensing section connectible at one end to a 5. Container for the concentrate via a non-return valve and insertable into an annular actuation device, the- : dispensing section comprising an axially movable actuation element acting axially on a section of flexible or shape-retaining resilient material forminga pumping 10 volume for reducing the volume between stops, wherein the section forming the pumping volume is arranged as a hoi low cylindrical tody in the dispensing section ihsertable - into the actuation devfce;.wherein the section of the hollow cylindrical body which can be varied between the 15 stops is formed so as to be small with respect to the . quantity to be dispensed in each case; wherein shaperetaining hollow cylindrical parts are provided which : support the hollow, cylindrical body in a shape-retaining manner against changes in shapein aradially outward 20 direction during a volume reduction phase; wherein the: hollow cylindrical· body iSs pretehsioned infan initial ; position of 1argest pumping volume with a -23predetermined force in the direction of an increase of the pumping volume; and wherein the actuation element is movable axially in a reciprocating manner a plurality of times per second by the actuation device during each dispensing operation.
5. A device as claimed in Claim 4, wherein the hollow cylindrical body comprises at least one annular fold directed radially inwards; and in that the hollow cylindrical parts radially supporting the hollow cylindrical body are formed by two rigid sleeve sections, one of which, forming a unit with the actuation element, is axially movable with respect to the other.
6. A device as claimed in Claim 5, wherein the sleeve sections are simultaneously formed as stops cooperating with one another to limit the axial compression movement of the hollow cylindrical body.
7. A device as claimed in Claim 5 or 6, wherein the axially movable rigid sleeve section and the actuation element form an axial movement unit with a rigid valve body of the non-return valve on the inlet side of the dispensing section.
8. A device as claimed in any one of claims 5 to 7, wherein a rigid guide tube is provided in which one end 526 25 -24: of the hollow cylindrical body is disposed so as to be axially fixed and the other end of the hoilow cylindrical/ /////- body is guided so as tobe axially displaceable. 7/
9. A device as claimed in anyone of claims 5 to 8 5 wherein the actuation element is formed as an annular armature of an electromagneticactuation device, the . actuation device being adapted to the axially movable unit iri such a way that the latter -is- cyclieally movable at the mains frequency su bstanti ally between 58 Hz -and 10. 60 Hz. ’-//7 :// ύ // / - / :// / 7 /
10. A device as claimed in one of claims 5 to 9, wherein / between the ends of the hollow cy 1 indrical body there is provided a spring retaining thebody in the starting position with the largest pumping volume under stretching 15 pretensioning. :: :/ /: / / / 7 / // 7
11. A device as claimed in Claim TO when dependent on Cl aim 8, wherein the annular spring is arranged i n an annular space '.’between the rigid guide tube and the hol l ow cylindrical body, the annular space having venting / 7 20 apertures opentowards the outer atmosphere. -2512. A device as claimed in any one of Claims 5 to 11, wherein a radially rigid support element is rigidly associated with the ridge of the radially inwardly directed fold of the hollow cylindrical body. 5 13. A device as claimed in Claim 12, wherein the radially rigid support element is an axially flexible helical spring.
12. 14. A device as claimed in any one of Claims 4 to 13, wherein the dispensing section has a further non-return 10 valve through which viscous concentrate is in use discharged from the dispensing section.
13. 15. A device as claimed in any one of Claims 4 to 14, wherein the pumping volume on the outlet side is freely connected to an outlet connection part having an internal 15 diameter and axial length such that the inner friction and surface tension of the concentrate in the outlet connection part are sufficient to retain the concentrate column unchanged in the outlet connection part when the pumping volume is axially unchanged and when the pumping
14. 20 volume increases.
IE476/82A 1981-03-26 1982-03-03 Method of and device for dispensing viscous concentrates of variable viscosity in accurately metered quantities of variable volume IE52625B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112024 1981-03-26
DE3131650A DE3131650C2 (en) 1981-03-26 1981-08-11 Device for dispensing viscous concentrates of variable viscosity in precisely metered amounts of variable volume, especially for vending machines

Publications (2)

Publication Number Publication Date
IE820476L IE820476L (en) 1982-09-26
IE52625B1 true IE52625B1 (en) 1988-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
IE476/82A IE52625B1 (en) 1981-03-26 1982-03-03 Method of and device for dispensing viscous concentrates of variable viscosity in accurately metered quantities of variable volume

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AT (1) AT380081B (en)
AU (1) AU555234B2 (en)
BR (1) BR8201607A (en)
CA (1) CA1188269A (en)
CH (1) CH659891A5 (en)
DE (1) DE3131650C2 (en)
DK (1) DK151118C (en)
ES (1) ES510765A0 (en)
FI (1) FI69517C (en)
FR (1) FR2502774B1 (en)
GB (1) GB2103296B (en)
IE (1) IE52625B1 (en)
IL (1) IL65121A (en)
IT (1) IT1199980B (en)
LU (1) LU84030A1 (en)
MX (1) MX159215A (en)
NL (1) NL184337C (en)
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GB2103296B (en) 1984-09-12
AU555234B2 (en) 1986-09-18
DE3131650A1 (en) 1982-10-14
IT8220359A0 (en) 1982-03-24
DE3131650C2 (en) 1985-02-14
AT380081B (en) 1986-04-10
CA1188269A (en) 1985-06-04
FI69517B (en) 1985-10-31
NL184337C (en) 1989-06-16
ES8302301A1 (en) 1983-02-01
DK151118C (en) 1988-06-27
PT74657B (en) 1983-09-14
NL8200969A (en) 1982-10-18
DK137282A (en) 1982-09-27
ATA117282A (en) 1985-08-15
BR8201607A (en) 1983-02-08
CH659891A5 (en) 1987-02-27
AR230100A1 (en) 1984-02-29
IT1199980B (en) 1989-01-05
AU8115282A (en) 1982-09-30
PT74657A (en) 1982-04-01
ES510765A0 (en) 1983-02-01
IL65121A (en) 1989-02-28
DK151118B (en) 1987-11-02
NL184337B (en) 1989-01-16
SE8201867L (en) 1982-09-27
GB2103296A (en) 1983-02-16
MX159215A (en) 1989-05-04
SE454385B (en) 1988-04-25
FI820853L (en) 1982-09-27
FR2502774B1 (en) 1985-09-27
FI69517C (en) 1986-02-10
IL65121A0 (en) 1982-04-30
FR2502774A1 (en) 1982-10-01
IE820476L (en) 1982-09-26
LU84030A1 (en) 1982-07-08

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