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EP0143183B1 - Dispenser for active materials - Google Patents

Dispenser for active materials Download PDF

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Publication number
EP0143183B1
EP0143183B1 EP84109706A EP84109706A EP0143183B1 EP 0143183 B1 EP0143183 B1 EP 0143183B1 EP 84109706 A EP84109706 A EP 84109706A EP 84109706 A EP84109706 A EP 84109706A EP 0143183 B1 EP0143183 B1 EP 0143183B1
Authority
EP
European Patent Office
Prior art keywords
piston
pump
storage space
dispenser according
cylinder
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.)
Expired
Application number
EP84109706A
Other languages
German (de)
French (fr)
Other versions
EP0143183A3 (en
EP0143183A2 (en
Inventor
Lothar Graf
Leo Maerte
Thomas Skorka
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.)
Aptar Radolfzell GmbH
Original Assignee
Ing Erich Pfeiffer GmbH
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 Ing Erich Pfeiffer GmbH filed Critical Ing Erich Pfeiffer GmbH
Priority to DE8686105985T priority Critical patent/DE3480057D1/en
Publication of EP0143183A2 publication Critical patent/EP0143183A2/en
Publication of EP0143183A3 publication Critical patent/EP0143183A3/en
Application granted granted Critical
Publication of EP0143183B1 publication Critical patent/EP0143183B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/76—Containers or packages with special means for dispensing contents for dispensing fluent contents by means of a piston
    • B65D83/765—Containers or packages with special means for dispensing contents for dispensing fluent contents by means of a piston the piston being a follower-piston and the dispensing means comprising a hand-operated pressure device at the opposite part of the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/02—Membranes or pistons acting on the contents inside the container, e.g. follower pistons
    • B05B11/028—Pistons separating the content remaining in the container from the atmospheric air to compensate underpressure inside the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B05B11/1004—Piston pumps comprising a movable cylinder and a stationary piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1066—Pump inlet valves
    • B05B11/107—Gate valves; Sliding valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1073—Springs
    • B05B11/1074—Springs located outside pump chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1073—Springs
    • B05B11/1077—Springs characterised by a particular shape or material

Definitions

  • the invention relates to an active substance dispenser according to the preamble of claim 1.
  • a dispenser for liquids or pasty products has become known from EP-A-88 236, which in FIGS. 3, 5 and 7 shows a storage container with a drag piston which reduces the storage space in accordance with the removal of the active substance.
  • the thrust piston pump is mounted with its cylinder housing on the container, in the upper wall of which the outlet valve is located. Something protrudes into the storage space and the trailing piston has a matching recess.
  • This known active substance dispenser is generally used for pasty active substances, for example toothpaste or the like. However, it is also essential to achieve an airtight seal of the active ingredient in the case of low-viscosity active ingredients, such as medical therapy and profilax active ingredients or the like, and yet to enable easy actuation and problem-free dispensing even for critical media.
  • the invention has for its object to provide an active substance dispenser in which, by means of a flow of the active substance which is as linear as possible, favorable flow conditions and thus high discharge pressures can be achieved from the storage space via the suction attachment to the vicinity of the discharge opening, so that the dispenser can also be used for such Active ingredients can be used that behave critically in this regard and z. B. should be atomized during discharge.
  • the active ingredient is taken over deeply from the storage space by the pump cylinder, so that it only has to carry out very small internal flow movements within the storage space.
  • the suction nozzle is cantilevered in the storage room.
  • EP-A-25 224 has already disclosed an active substance dispenser which has a container with a relatively narrow neck, in the neck section of which the pump cylinder is accommodated and projects somewhat into the storage space with a nozzle. However, a suction hose is inserted into the nozzle, which extends to the bottom of the container. A trailing piston is not provided here, so that only liquid products can be dispensed with this atomizer that come into contact with the air flowing in as a replacement for the dispensed liquid and are therefore unsuitable for certain active substances. This arrangement is therefore not intended for a version with a trailing piston. The same applies to Fig. 1 of EP-A-88 236. From EP-A-25 224 it is known that the cylinder housing of the thrust piston pump forms the closure of the storage space.
  • a particularly advantageous development of the subject matter of the invention is that an axially biased outlet valve, mechanically positively opened at the end of the piston stroke, is provided in the conduit path between the pump piston and the discharge opening, the closing part of which is preferably formed by an elastic compression sleeve, the outer end of which is attached to one Piston shaft is attached and in particular with the inner end adjacent to the annular closing part forms the annular piston.
  • This makes it possible to put the active ingredient in the pump cylinder under increased pressure during the pump stroke of the pump piston without the active ingredient already escaping, after which the active ingredient compressed in this way is suddenly released and exits at the associated end of the pump cylinder by mechanical opening of the outlet valve.
  • this also makes it possible to design the dispenser in such a way that the active substance inside the dispenser can under no circumstances come into contact with air, which is of great importance for some medicinal active substances.
  • the annular closing part of the outlet valve has a valve closing surface which is located on the inner circumferential surface and is associated with the piston skirt, and an abutment surface which is located on the outer circumference and which, when reset Pump piston with prestress sealingly rests on a counter shoulder of the pump cylinder.
  • the outlet valve is mechanically positively closed when the pump piston is reset.
  • the pump cylinder is also hermetically sealed to the storage space when the pump piston is reset.
  • the valve closing pressure of the outlet valve is higher than the maximum pressure in the storage space, so that under no circumstances can active ingredient escape from the dispenser unintentionally, ie without actuating the pump.
  • the trailing piston has a cup-shaped, open hollow design for the piston pump and that the inner cross sections of the trailing piston are essentially precisely adapted to the, in particular stepped, tapered outer shape of the portion of the piston pump protruding into the storage space, such that the latter Section fills the cavity of the trailing piston with the reservoir empty.
  • the active ingredient dispenser has as a pump a manually operated piston pump 1 b, which is fastened by a clamping ring with the interposition of a seal 32 with a sleeve-shaped housing part 33 on the end face of the neck 31 b of the container 2 b and with all parts axially aligned with the container 2b lies.
  • the cylinder 3b On the housing part 33, which is designed in the manner of two coaxially one inside the other and merges with one another on the outer end face, the cylinder 3b is fastened with its outer end section engaging in a form-fitting manner between the two sleeves of the housing part 33 in such a way that it adjusts the inner circumference of the neck 31b with a small gap distance surrounds and protrudes relatively deep into the storage space 28b to its central area with a suction attachment 34 forming its inner tapered end in the form of a suction nozzle.
  • the cylinder 3b forms approximately in the region of the neck 31b a piston raceway 13b for the piston 4b, which is formed by an inner end section of a sleeve-shaped component made of rubber-elastic material.
  • the piston 4b which is widened in the shape of a truncated cone at an acute angle in the direction of the pump stroke and tapered uniformly in its wall thickness, merges at its rear end in one piece into an annular closing part 21b of an outlet valve 17b, which in turn on the side facing away from the piston 4b into a compression sleeve 35 which can be resiliently shortened by axial pressure transforms.
  • the compression sleeve 35 forms a flange ring 36 which is formed in one piece with the piston 4b and which is fastened in an end groove of the piston shaft 8b.
  • the compression sleeve 35 is convexly curved on the outside in cross-section, this curvature increasing with compression or shortening of the compression sleeve 35.
  • the sleeve-shaped elastic component is tightly closed between the annular lip-like piston seal 37 provided at the free end of the piston 4b, formed directly by the piston and closely abutting the piston raceway 13b, and the fastening of the flange ring 36 in the piston shaft 8b.
  • the piston shaft 8b which forms the associated section of the line connection 19b between the cylinder space 10b and the discharge opening 18b in its interior, consists of two parts, namely an outer sleeve-shaped part 38 and a plunger 39 which extends over part of the length of the sleeve-shaped part 38 thereof The inside or the end facing the container 2b engages, leaving the line connection free.
  • the end groove is provided for receiving the flange ring 36.
  • the plunger 39 has in the area of the closing part 21 b an annular collar projecting over its circumference, the end face of which, at the obtuse angle 34 at an obtuse angle and extended away from the suction nozzle 34, forms one of the two closing surfaces, namely the closing surface 40 of the outlet valve 17b.
  • the closing part 21b forms on its inner circumference the other valve closing surface 41, which is adapted to the closing surface 40 and which, when the pump is in the initial position, bears against the closing surface 40 with a relatively high closing pressure under the force of the compression sleeve 35 serving as a valve closing spring.
  • the inner sleeve 6b of the housing part 33 which engages in the rear open end of the cylinder 3b, forms, with its free end lying in the cylinder 3b, a counter shoulder 26b for an annular shoulder-shaped stop surface 42 provided on the outer circumference of the closing part 21b, which has a frustoconical cross-section in cross section Suction port 34 is expanded.
  • the stop surface 42 runs onto the counter shoulder 26b, as a result of which the compression sleeve 35 is slightly stretched and the closing part 21b of the outlet valve 17b is both axially pressed against the closing surface 40 and also biased radially to the axis of the outlet valve 17b.
  • the cylinder 3b is structurally combined with the housing part 33 so that, when the piston 4b is in the initial position, an annular space 43 is provided on the outside thereof, which is between the Piston seal 37 and the valve-like seal, which is formed by abutment of the counter shoulder 26b on the stop surface 42.
  • the piston raceway 13b merges into a stop shoulder 14b projecting inward in a ring, onto which the piston 4b runs with its free end face at the end of the pump stroke according to FIG. 2.
  • the piston shaft 8b can be moved in the direction of the pump stroke by a small distance, so that the closing surface 40 then lifts from the valve closing surface 41 and an annular between these surfaces Passage opening 20b of the outlet valve 17b is released.
  • the compression sleeve 35 is elastically compressed and thereby shortened.
  • a sleeve-shaped connecting nipple 16b is placed with a plug connection, which forms an integral component with a cap-like handle 22b surrounding it and is arranged with an outer sleeve on the end wall 23b thereof.
  • the discharge opening 18b designed as an atomizer opening is provided.
  • the trailing piston 29b has an outer piston ring with two annular, sealed lips provided at both ends and a fitting sleeve 45 located therein, which with its open end facing the piston pump 1b merges in one piece and tightly into the piston ring 29b.
  • the inner cross sections of the fitting sleeve 45 which is axially aligned with the section of the piston pump 1b projecting into the storage space 28b via the end wall 7b of the container 2b and which is cup-shaped at its end remote from the piston pump 1b and projecting beyond the associated end of the piston ring Adapted to the outer shape of the above-mentioned section of the piston pump 1b, that in the end position of the trailing piston 29b associated with the emptied storage space 28b, the projecting section of the piston pump 1b fills the interior of the adapter sleeve 45 almost completely without gaps and the free end of the suction nozzle 34 on the bottom wall the adapter sleeve 45 abuts. In this position, the associated end face
  • the product to be atomized that is to say the active substance, does not come into contact with oxygen before the discharge, since at no point in time during the application does a connection channel arise between the container and the outside air.
  • the atomization or discharge can also be in any position of the donor, e.g. B. in the top position, because the active ingredient is always present at the suction attachment 34.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft einen Wirkstoff-Spender nach dem Oberbegriff des Anspruchs 1.The invention relates to an active substance dispenser according to the preamble of claim 1.

Aus der EP-A-88 236 ist ein Spender für Flüssigkeiten oder pastöse Produkte bekannt geworden, der in seinen Figuren 3, 5 und 7 einen Vorratsbehälter mit einem Schleppkolben zeigt, der den Vorratsraum entsprechend der Entnahme des Wirkstoffes verkleinert. Die Schubkolbenpumpe ist mit ihrem Zylindergehäuse auf den Behälter montiert, in dessen oberer Wandung sich das Auslaßventil befindet. Es ragt etwas in den Vorratsraum hinein, und der Schleppkolben hat eine dazu passende Ausnehmung.A dispenser for liquids or pasty products has become known from EP-A-88 236, which in FIGS. 3, 5 and 7 shows a storage container with a drag piston which reduces the storage space in accordance with the removal of the active substance. The thrust piston pump is mounted with its cylinder housing on the container, in the upper wall of which the outlet valve is located. Something protrudes into the storage space and the trailing piston has a matching recess.

Dieser bekannte Wirkstoff-Spender wird in der Regel für pastöse Wirkstoffe, beispielsweise Zahnpaste oder dgl., verwendet. Es ist allerdings auch wesentlich, bei dünnflüssigen Wirkstoffen, wie medizinischen Therapie- und Profilaxe-Wirkstoffen oder dgl., einen auch im Gebrauch luftdichten Abschluß des Wirkstoffes zu erreichen und trotzdem eine leichte Betätigung und eine problemlose Ausgabe auch für kritische Medien zu ermöglichen.This known active substance dispenser is generally used for pasty active substances, for example toothpaste or the like. However, it is also essential to achieve an airtight seal of the active ingredient in the case of low-viscosity active ingredients, such as medical therapy and profilax active ingredients or the like, and yet to enable easy actuation and problem-free dispensing even for critical media.

Der Erfindung liegt die Aufgabe zugrunde, einen Wirkstoff-Spender zu schaffen, bei dem durch möglichst lineare Strömung des Wirkstoffes vom Vorratsraum über den Saugansatz bis in die Nähe der Austragöffnung günstige Strömungsverhältnisse und damit hohe Austragdrücke erzielt werden können, so daß der Spender auch für solche Wirkstoffe eingesetzt werden kann, die sich in dieser Beziehung kritisch verhalten und z. B. beim Austrag zerstäubt werden sollen.The invention has for its object to provide an active substance dispenser in which, by means of a flow of the active substance which is as linear as possible, favorable flow conditions and thus high discharge pressures can be achieved from the storage space via the suction attachment to the vicinity of the discharge opening, so that the dispenser can also be used for such Active ingredients can be used that behave critically in this regard and z. B. should be atomized during discharge.

Diese Aufgabe wird erfindungsgemäß durch den Anspruch 1 gelöst.This object is achieved by claim 1.

Durch den vorzugsweise achsgleich weit in den Vorratsraum ragenden Endabschnitt des Pumpenzylinders bzw. Saugansatzes wird der Wirkstoff vom Pumpenzylinder tief aus dem Vorratsraum übernommen, so daß er innerhalb des Vorratsraumes nur sehr geringe innere Strömungsbewegungen ausführen muß. Der Saugstutzen liegt also frei auskragend im Vorratsraum.Due to the preferably axially far-reaching end section of the pump cylinder or suction attachment, the active ingredient is taken over deeply from the storage space by the pump cylinder, so that it only has to carry out very small internal flow movements within the storage space. The suction nozzle is cantilevered in the storage room.

Es sei bemerkt, daß aus der EP-A-25 224 bereits ein Wirkstoffspender bekannt geworden ist, der einen Behälter mit einem relativ schmalen Hals aufweist, in dessen Halsabschnitt der Pumpenzylinder untergebracht ist und mit einem Stutzen etwas in den Vorratsraum hineinragt. In den Stutzen ist allerdings ein Saugschlauch eingeführt, der bis zum Boden des Behälters reicht. Hier ist ein Schleppkolben nicht vorgesehen, so daß mit diesem Zerstäuber nur flüssige Produkte ausgegeben werden können, die mit der im Ersatz für die ausgegebene Flüssigkeit einströmenden Luft in Berührung kommt und daher für gewisse Wirkstoffe ungeeignet ist. Für eine Ausführung mit Schleppkolben ist diese Anordnung daher nicht vorgesehen. Das gleiche gilt für Fig. 1 der EP-A-88 236. Aus der EP-A-25 224 ist bekannt, daß das Zylindergehäuse der Schubkolbenpumpe den Verschluß des Vorratsraums bildet.It should be noted that EP-A-25 224 has already disclosed an active substance dispenser which has a container with a relatively narrow neck, in the neck section of which the pump cylinder is accommodated and projects somewhat into the storage space with a nozzle. However, a suction hose is inserted into the nozzle, which extends to the bottom of the container. A trailing piston is not provided here, so that only liquid products can be dispensed with this atomizer that come into contact with the air flowing in as a replacement for the dispensed liquid and are therefore unsuitable for certain active substances. This arrangement is therefore not intended for a version with a trailing piston. The same applies to Fig. 1 of EP-A-88 236. From EP-A-25 224 it is known that the cylinder housing of the thrust piston pump forms the closure of the storage space.

Durch den relativ weit bis in einen mittleren Bereich des Vorratsraumes ragenden Saugstutzen werden günstige Ansaugverhältnisse geschaffen. Trotzdem wird durch die entsprechende napfförmige Vertiefung im Schleppkolben dafür gesorgt, daß kaum Wirkstoff ungenutzt im Behälter verbleibt.Favorable suction conditions are created by the suction nozzle projecting relatively far into a central region of the storage space. Nevertheless, the corresponding cup-shaped depression in the trailing piston ensures that hardly any active ingredient remains unused in the container.

Eine besonders vorteilhafte Weiterbildung des Erfindungsgegenstandes besteht darin, daß im Leitungsweg zwischen dem Pumpkolben und der Austragöffnung ein axial vorgespanntes, am Ende des Kolbenhubes mechanisch zwangsgesteuert geöffnetes Auslaßventil vorgesehen ist, dessen Schließteil vorzugsweise durch eine elastische Stauchhülse gebildet ist, die mit ihrem äußeren Ende an einem Kolbenschaft befestigt ist und insbesondere mit dem inneren Ende benachbart zum ringförmigen Schließteil den ringförmigen Kolben bildet. Dadurch ist es möglich, beim Pumphub des Pumpkolbens den Wirkstoff zunächst im Pumpenzylinder unter erhöhten Druck zu setzen, ohne daß der Wirkstoff bereits entweichen kann, wonach durch mechanisches Öffnen des Auslaßventiles der so komprimierte Wirkstoff schlagartig am zugehörigen Ende des Pumpenzylinders freigegeben wird und austritt. Insbesondere ist es dadurch auch möglich, den Spender so auszubilden, daß der Wirkstoff innerhalb des Spenders unter keinen Umständen mit Luft in Berührung kommen kann, was bei manchen medizinischen Wirkstoffen von großer Wichtigkeit ist.A particularly advantageous development of the subject matter of the invention is that an axially biased outlet valve, mechanically positively opened at the end of the piston stroke, is provided in the conduit path between the pump piston and the discharge opening, the closing part of which is preferably formed by an elastic compression sleeve, the outer end of which is attached to one Piston shaft is attached and in particular with the inner end adjacent to the annular closing part forms the annular piston. This makes it possible to put the active ingredient in the pump cylinder under increased pressure during the pump stroke of the pump piston without the active ingredient already escaping, after which the active ingredient compressed in this way is suddenly released and exits at the associated end of the pump cylinder by mechanical opening of the outlet valve. In particular, this also makes it possible to design the dispenser in such a way that the active substance inside the dispenser can under no circumstances come into contact with air, which is of great importance for some medicinal active substances.

Die zuletzt genannten Vorteile werden noch weiter dadurch verbessert, daß der Pumpkolben am Ende des Kobenhubes an einer Anschlagschulter anliegt und daß der Kolbenschaft unter Öffnung des Auslaßventiles über die Anschlagstellung des Pumpkolbens hinaus verfahrbar ist.The last-mentioned advantages are further improved in that the pump piston rests against a stop shoulder at the end of the piston stroke and in that the piston shaft can be moved beyond the stop position of the pump piston by opening the outlet valve.

Damit der Pumpenzylinder bei Nichtgebrauch des Spenders, also bei entlastetem Pumpkolben, nach außen besonders sicher dicht verschlossen ist, weist der ringförmige Schließteil des Auslaßventiles eine an der Innenumfangsfläche liegende, dem Kolbenschaft zugeordnete Ventil-Schließfläche und eine am Außenumfang liegende Anschlagfläche auf, welche bei rückgestelltem Pumpkolben mit Vorspannung dichtend an einer Gegenschulter des Pumpenzylinders anliegt. Dadurch wird das Auslaßventil bei rückgestelltem Pumpkolben mechanisch formschlüssig zwangsläufig geschlossen gehalten.So that the pump cylinder is particularly securely sealed to the outside when the dispenser is not in use, that is to say when the pump piston is unloaded, the annular closing part of the outlet valve has a valve closing surface which is located on the inner circumferential surface and is associated with the piston skirt, and an abutment surface which is located on the outer circumference and which, when reset Pump piston with prestress sealingly rests on a counter shoulder of the pump cylinder. As a result, the outlet valve is mechanically positively closed when the pump piston is reset.

In weiterer Ausbildung der Erfindung ist der Pumpenzylinder bei rückgestelltem Pumpkolben auch zum Vorratsraum druckdicht hermetisch verschlossen. Der Ventilschließdruck des Auslaßventiles ist erfindungsgemäß höher als der maximale Druck im Vorratsraum, so daß unbeabsichtigt, d.h. ohne Betätigung der Pumpe, unter keinen Umständen Wirkstoff aus dem Spender austreten kann.In a further embodiment of the invention, the pump cylinder is also hermetically sealed to the storage space when the pump piston is reset. According to the invention, the valve closing pressure of the outlet valve is higher than the maximum pressure in the storage space, so that under no circumstances can active ingredient escape from the dispenser unintentionally, ie without actuating the pump.

Ist zwischen der Kolbendichtung und der durch die Anschlagfläche und die Gegenschulter gebildeten Abdichtung ein vollständig geschlossener, außen vom ununterbrochenen Mantel des Pumpenzylinders begrenzter Ringraum gebildet, so kann Wirkstoff auch nicht außen am Kolben vorbei und zwischen Kolbenschaft und Pumpenzylinder hindurch nach außen gelangen.If a completely closed annular space is formed between the piston seal and the seal formed by the stop surface and the counter shoulder, the active substance cannot pass the piston outside and between the piston shaft and the pump cylinder to the outside.

Eine besonders vorteilhafte Weiterbildung des Erfindungsgegenstandes besteht darin, daß der Schleppkolben napfförmig zur Kolbenpumpe offen hohl ausgebildet ist und daß die Innenquerschnitte des Schleppkolbens im wesentlichen genau an die, insbesondere abgestuft verjüngte Außenform des in den Vorratsraum ragenden Abschnittes der Kolbenpumpe angepaßt sind, derart, daß dieser Abschnitt bei entleertem Vorratsraum den Hohlraum des Schleppkolbens ausfüllt. Dadurch ist es möglich, den Vorratsraum nahezu restlos zu entleeren, was insbesondere bei sehr teuren oder bei, bei nicht zweckbestimmter Anwendung, stark umweltbelastenden Wirkstoffen erwünscht ist.A particularly advantageous development of the subject matter of the invention is that the trailing piston has a cup-shaped, open hollow design for the piston pump and that the inner cross sections of the trailing piston are essentially precisely adapted to the, in particular stepped, tapered outer shape of the portion of the piston pump protruding into the storage space, such that the latter Section fills the cavity of the trailing piston with the reservoir empty. This makes it possible to empty the storage space almost completely, which is particularly desirable in the case of very expensive or, in the case of non-intended use, highly environmentally harmful active substances.

Die Erfindung wird im folgenden mit weiteren Einzelheiten anhand der in den Zeichnungen dargestellten Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with further details using the exemplary embodiments illustrated in the drawings.

Es sind dargestellt in

  • Fig. 1 ein Wirkstoff-Spender, im TeilAxialschnitt und
  • Fig. 2 ein Detail des Wirkstoff-Spenders nach Fig. 1 in vergrößerter Darstellung am Ende des Pumphubes.
They are shown in
  • Fig. 1 is an active ingredient donor, in the partial axial section and
  • Fig. 2 shows a detail of the active ingredient dispenser according to Fig. 1 in an enlarged view at the end of the pump stroke.

Der Wirkstoff-Spender weist als Pumpe eine von Hand zu betätigende Kolbenpumpe 1 b auf, die unter Zwischenlage einer Dichtung 32 mit einem hülsenförmigen Gehäuseteil 33 an der Stirnfläche des Halses 31 b des Behälters 2b durch einen Spannring befestigt ist und mit allen Teilen achsgleich zum Behälter 2b liegt. An dem nach Art zweier koaxial ineinanderliegender und an der äußeren Stirnseite ineinander übergehender Hülsen ausgebildeten Gehäuseteil 33 ist der Zylinder 3b mit seinem äußeren, formschlüssig zwischen die beiden Hülsen des Gehäuseteiles 33 eingreifenden Endabschnitt so befestigt, daß er den Innenumfang des Halses 31 b mit geringem Spaltabstand umgibt und mit einem sein inneres verjüngtes Ende bildenden Saugansatz 34 in Form eines Saugstutzens verhältnismäßig tief in den Vorratsraum 28b bis in dessen mittleren Bereich ragt. Der Zylinder 3b bildet etwa im Bereich des Halses 31 b eine Kolbenlaufbahn 13b für den Kolben 4b, der durch einen inneren Endabschnitt eines hülsenförmigen Bauteiles aus gummielastischem Werkstoff gebildet ist. Der in Richtung des Pumphubes spitzwinklig kegelstumpfförmig erweiterte und in seiner Wandungsdicke gleichmäßig verjüngte Kolben 4b geht an seinem hinteren Ende einstückig in ein ringförmiges Schließteil 21 b eines Auslaßventiles 17b über, das seinerseits an der vom Kolben 4b abgekehrten Seite in eine durch Axialdruck federnd verkürzbare Stauchhülse 35 übergeht. An dem vom Kolben 4b abgekehrten Ende bildet die Stauchhülse 35 einen einstückig mit dem Kolben 4b ausgebildeten Flanschring 36, welcher in einer Stirnnut des Kolbenschaftes 8b befestigt ist. Die Stauchhülse 35 ist im Querschnitt an der Außenseite konvex gewölbt, wobei diese Wölbung bei Stauchung bzw. Verkürzung der Stauchhülse 35 zunimmt. Der hülsenförmige elastische Bauteil ist zwischen der am freien Ende des Kolbens 4b vorgesehenen, unmittelbar durch den Kolben gebildeten und an der Kolbenlaufbahn 13b dicht anliegenden, ringlippenartigen Kolbendichtung 37 und der Befestigung des Flanschringes 36 im Kolbenschaft 8b dicht geschlossen.The active ingredient dispenser has as a pump a manually operated piston pump 1 b, which is fastened by a clamping ring with the interposition of a seal 32 with a sleeve-shaped housing part 33 on the end face of the neck 31 b of the container 2 b and with all parts axially aligned with the container 2b lies. On the housing part 33, which is designed in the manner of two coaxially one inside the other and merges with one another on the outer end face, the cylinder 3b is fastened with its outer end section engaging in a form-fitting manner between the two sleeves of the housing part 33 in such a way that it adjusts the inner circumference of the neck 31b with a small gap distance surrounds and protrudes relatively deep into the storage space 28b to its central area with a suction attachment 34 forming its inner tapered end in the form of a suction nozzle. The cylinder 3b forms approximately in the region of the neck 31b a piston raceway 13b for the piston 4b, which is formed by an inner end section of a sleeve-shaped component made of rubber-elastic material. The piston 4b, which is widened in the shape of a truncated cone at an acute angle in the direction of the pump stroke and tapered uniformly in its wall thickness, merges at its rear end in one piece into an annular closing part 21b of an outlet valve 17b, which in turn on the side facing away from the piston 4b into a compression sleeve 35 which can be resiliently shortened by axial pressure transforms. At the end facing away from the piston 4b, the compression sleeve 35 forms a flange ring 36 which is formed in one piece with the piston 4b and which is fastened in an end groove of the piston shaft 8b. The compression sleeve 35 is convexly curved on the outside in cross-section, this curvature increasing with compression or shortening of the compression sleeve 35. The sleeve-shaped elastic component is tightly closed between the annular lip-like piston seal 37 provided at the free end of the piston 4b, formed directly by the piston and closely abutting the piston raceway 13b, and the fastening of the flange ring 36 in the piston shaft 8b.

Der Kolbenschaft 8b, der in seinem Inneren den zugehörigen Abschnitt der Leitungsverbindung 19b zwischen Zylinderraum 10b und Austragöffnung 18b bildet, besteht aus zwei Teilen, nämlich einem äußeren hülsenförmigen Teil 38 und einem Stempel 39, der über einen Teil der Länge des hülsenförmigen Teiles 38 in dessen Inneres bzw. dem Behälter 2b zugekehrtes Ende unter Freilassung der Leitungsverbindung eingreift. Am inneren Ende des hülsenförmigen Teiles 38 ist die Stirnnut für die Aufnahme des Flanschringes 36 vorgesehen. Der Stempel 39 weist im Bereich des Schließteiles 21 b einen über seinen Umfang vorstehenden Ringbund auf, dessen zum Saugstutzen 34 stumpfwinklig kegelstumpfförmig erweiterte, vom Saugstutzen 34 abgekehrte Stirnfläche eine der beiden Schließflächen, nämlich die Schließfläche 40 des Auslaßventiles 17b bildet. Der Schließteil 21b bildet an seinem Innenumfang die andere, an die Schließfläche 40 angepaßte Ventil-Schließfläche 41, welche bei Ausgangslage der Pumpe mit verhältnismäßig großem Schließdruck unter der Kraft der als Ventilschließfeder dienenden Stauchhülse 35 an der Schließfläche 40 anliegt.The piston shaft 8b, which forms the associated section of the line connection 19b between the cylinder space 10b and the discharge opening 18b in its interior, consists of two parts, namely an outer sleeve-shaped part 38 and a plunger 39 which extends over part of the length of the sleeve-shaped part 38 thereof The inside or the end facing the container 2b engages, leaving the line connection free. At the inner end of the sleeve-shaped part 38, the end groove is provided for receiving the flange ring 36. The plunger 39 has in the area of the closing part 21 b an annular collar projecting over its circumference, the end face of which, at the obtuse angle 34 at an obtuse angle and extended away from the suction nozzle 34, forms one of the two closing surfaces, namely the closing surface 40 of the outlet valve 17b. The closing part 21b forms on its inner circumference the other valve closing surface 41, which is adapted to the closing surface 40 and which, when the pump is in the initial position, bears against the closing surface 40 with a relatively high closing pressure under the force of the compression sleeve 35 serving as a valve closing spring.

Die Innenhülse 6b des Gehäuseteiles 33, welche in das hintere offene Ende des Zylinders 3b eingreift, bildet mit ihrem freien, im Zylinder 3b liegenden Ende eine Gegenschulter 26b für eine am Außenumfang des Schließteiles 21 b vorgesehene ringschulterförmige Anschlagfläche 42, die im Querschnitt spitzwinklig kegelstumpfförmig zum Saugstutzen 34 hin erweitert ist. Am Ende der Rückstellbewegung des Kolbens 4b läuft die Anschlagfläche 42 auf die Gegenschulter 26b auf, wodurch die Stauchhülse 35 geringfügig gestreckt und der Schließteil 21 b des Auslaßventiles 17b zwangsläufig sowohl axial gegen die Schließfläche 40 gepreßt als auch radial zur Achse des Auslaßventiles 17b vorgespannt wird, so daß ein äußerst dichter und sicherer Schluß des Auslaßventiles 17b gewährleistet ist. Der Zylinder 3b ist mit dem Gehäuseteil 33 druckdicht baulich vereint, so daß bei Ausgangsstellung des Kolbens 4b an dessen Außenseite ein Ringraum 43 vorgesehen ist, welcher zwischen der Kolbendichtung 37 und derjenigen, ventilartigen Abdichtung liegt, welche durch Anlage der Gegenschulter 26b an der Anschlagfläche 42 gebildet ist.The inner sleeve 6b of the housing part 33, which engages in the rear open end of the cylinder 3b, forms, with its free end lying in the cylinder 3b, a counter shoulder 26b for an annular shoulder-shaped stop surface 42 provided on the outer circumference of the closing part 21b, which has a frustoconical cross-section in cross section Suction port 34 is expanded. At the end of the return movement of the piston 4b, the stop surface 42 runs onto the counter shoulder 26b, as a result of which the compression sleeve 35 is slightly stretched and the closing part 21b of the outlet valve 17b is both axially pressed against the closing surface 40 and also biased radially to the axis of the outlet valve 17b. so that an extremely tight and secure closure of the outlet valve 17b is ensured. The cylinder 3b is structurally combined with the housing part 33 so that, when the piston 4b is in the initial position, an annular space 43 is provided on the outside thereof, which is between the Piston seal 37 and the valve-like seal, which is formed by abutment of the counter shoulder 26b on the stop surface 42.

Am inneren Ende geht die Kolbenlaufbahn 13b in eine ringförmig nach innen vorspringende Anschlagschulter 14b über, auf welche der Kolben 4b am Ende des Pumphubes gemäß Fig. 2 mit seiner freien Stirnfläche aufläuft. Über diese Stellung, bei welcher der Kolben 4b die Anschlagschulter 14b erreicht hat, kann der Kolbenschaft 8b in Richtung des Pumphubes um ein geringes Wegstück hinaus bewegt werden, so daß dann die Schließfläche 40 von der Ventil-Schließfläche 41 abhebt und zwischen diesen Flächen eine ringförmige Durchtrittsöffnung 20b des Auslaßventiles 17b freigegeben wird. Hierbei wird die Stauchhülse 35 elastisch federnd gestaucht und dadurch verkürzt. Im Augenblick des Freigebens der Durchtrittsöffnung 20b kann der durch den vorangehenden Pumphub bereits unter Druck gesetzte Wirkstoff schlagartig in die Leitungsverbindung 19b und von dort durch die Austragöffnung 18b nach außen gelangen. Sobald der Kolbenschaft 8b wieder freigegeben wird, wird er durch die in seiner Achse liegende und unmittelbar an ihm angreifende Rückstellfeder 27b zurückbewegt, wobei zuerst das Auslaßventil 17b unter der rückstellenden Federkraft der Stauchhülse 35 schließt und danach der Kolben 4b in seine Ausgangslage zurückgeführt wird. Während des Rückhubes des Kolbens 4b wird über den Saugansatz 34 und unter Öffnung eines an diesen anschließenden, als Kugelventil ausgebildeten Rückschlagventiles 44 Wirkstoff in den Zylinderraum 10b nachgesaugt und dadurch zum Austrag während des nächsten Pumphubes bereitgestellt.At the inner end, the piston raceway 13b merges into a stop shoulder 14b projecting inward in a ring, onto which the piston 4b runs with its free end face at the end of the pump stroke according to FIG. 2. About this position, in which the piston 4b has reached the stop shoulder 14b, the piston shaft 8b can be moved in the direction of the pump stroke by a small distance, so that the closing surface 40 then lifts from the valve closing surface 41 and an annular between these surfaces Passage opening 20b of the outlet valve 17b is released. Here, the compression sleeve 35 is elastically compressed and thereby shortened. When the passage opening 20b is released, the active substance already pressurized by the preceding pumping stroke can suddenly reach the line connection 19b and from there through the discharge opening 18b to the outside. As soon as the piston shaft 8b is released again, it is moved back by the return spring 27b which lies on its axis and acts directly on it, the outlet valve 17b first closing under the restoring spring force of the compression sleeve 35 and then the piston 4b being returned to its starting position. During the return stroke of the piston 4b, active ingredient is sucked into the cylinder space 10b via the suction attachment 34 and while opening a check valve 44, which is designed as a ball valve, and is thereby made available for discharge during the next pumping stroke.

Auf das äußere Ende des hülsenförmigen Teiles 38 des Kolbenschaftes 8b ist mit einer Steckverbindung ein hülsenförmiger Anschlußnippel 16b aufgesetzt, der einen einstückigen Bauteil mit einer ihn umgebenden, kappenartigen Handhabe 22b bildet und mit einer Außenhülse an deren Stirnwand 23b angeordnet ist. Am freien Ende des Anschlußnippels 16b, der zur Verringerung seiner Innenquerschnitte und damit der Durchlaßquerschnitte für den Wirkstoff mit einem Einsatz versehen sein kann, ist die als Zerstäuberöffnung ausgebildete Austragöffnung 18b vorgesehen.On the outer end of the sleeve-shaped part 38 of the piston shaft 8b, a sleeve-shaped connecting nipple 16b is placed with a plug connection, which forms an integral component with a cap-like handle 22b surrounding it and is arranged with an outer sleeve on the end wall 23b thereof. At the free end of the connecting nipple 16b, which can be provided with an insert to reduce its internal cross-sections and thus the passage cross-sections for the active substance, the discharge opening 18b designed as an atomizer opening is provided.

Der Schleppkolben 29b weist einen äußeren Kolbenring mit zwei an beiden Enden vorgesehenen, ringförmigen, dichten Lippen und eine in diesem liegende Paßhülse 45 auf, die mit ihrer offenen, der Kolbenpumpe 1 b zugekehrten Stirnseite einteilig und dicht in den Kolbenring 29b übergeht. Die Innenquerschnitte der achsgleich zu dem über die Stirnwand 7b des Behälters 2b in den Vorratsraum 28b ragenden Abschnittes der Kolbenpumpe 1b liegenden Paßhülse 45, die an ihrem von der Kolbenpumpe 1 b abgekehrten, über das zugehörige Ende des Kolbenringes vorstehenden Ende napfförmig geschlossen ist, sind so an die Außenform des genannten vorstehenden Abschnittes der Kolbenpumpe 1b angepaßt, daß bei der dem geleerten Vorratsraum 28b zugehörigen Endstellung des Schleppkolbens 29b der vorstehende Abschnitt der Kolbenpumpe 1 b das Innere der Paßhülse 45 nahezu vollständig lückenfrei ausfüllt und das freie Ende des Saugstutzens 34 an der Bodenwand der Paßhülse 45 anliegt. In dieser Stellung liegt auch die zugehörige Stirnfläche des Schleppkolbens 29b nahezu ganzflächig an der Innenseite der Stirnwand 7b des Behälters 2b an. Der Vorratsraum 28b kann dadurch bis auf winzigste Reste von Wirkstoff vollständig entleert werden.The trailing piston 29b has an outer piston ring with two annular, sealed lips provided at both ends and a fitting sleeve 45 located therein, which with its open end facing the piston pump 1b merges in one piece and tightly into the piston ring 29b. The inner cross sections of the fitting sleeve 45, which is axially aligned with the section of the piston pump 1b projecting into the storage space 28b via the end wall 7b of the container 2b and which is cup-shaped at its end remote from the piston pump 1b and projecting beyond the associated end of the piston ring Adapted to the outer shape of the above-mentioned section of the piston pump 1b, that in the end position of the trailing piston 29b associated with the emptied storage space 28b, the projecting section of the piston pump 1b fills the interior of the adapter sleeve 45 almost completely without gaps and the free end of the suction nozzle 34 on the bottom wall the adapter sleeve 45 abuts. In this position, the associated end face of the drag piston 29b also bears almost all over the inside of the end wall 7b of the container 2b. The storage space 28b can thereby be completely emptied except for the tiniest residues of active ingredient.

Bei der Ausführungsform nach den Fig. 1 und 2 ist des weiteren besonders vorteilhaft, daß das zu zerstäubende Produkt, also der Wirstoff, vor dem Austrag nicht mit Sauerstoff in Verbindung kommt, da zu keinem Zeitpunkt der Ausbringung ein Verbindungskanal zwischen Behältnis und Außenluft entsteht. Die Zerstäubung bzw. der Austrag kann auch in jeder Lage des Spenders, z. B. in Kopflage, erfolgen, da Wirkstoff stets am Saugansatz 34 vorhanden ist.In the embodiment according to FIGS. 1 and 2, it is further particularly advantageous that the product to be atomized, that is to say the active substance, does not come into contact with oxygen before the discharge, since at no point in time during the application does a connection channel arise between the container and the outside air. The atomization or discharge can also be in any position of the donor, e.g. B. in the top position, because the active ingredient is always present at the suction attachment 34.

Claims (12)

1. Active material dispenser with a storage container (2b), which has a container neck (31 b) and a storage space (28b) connected thereto via an end wall (7b), with a drag piston (29b) displaceable in storage space (28b) and with a thrust piston pump (1 b) for the discharge of the active material from storage space (28b) inserted with a cylinder casing (3b) in container neck (31 b), a suction shoulder (34) with a suction opening projecting into the storage space (28b) is associated with the thrust piston pump (1b) and in the drag piston (29b) is provided a cup-shaped depression whose cross-section corresponds to the shape of the suction shoulder, characterized in that the cylinder casing (3b) of the thrust piston pump (1 b) forms the closure of the storage space (28b) and that the suction shoulder (34) is part of the cylinder casing (3b) and as a suction connection projects into a central area of the storage space (28b).
2. Dispenser according to claim 1, characterized in that the cup-shaped depression is formed by a cup-shaped sleeve (45) located within a piston ring of the drag piston (29b) and whereof one end is closed.
3. Dispenser according to claim 2, characterized in that the sleeve (45) projects over the end of the piston ring remote from the thrust piston pump (1b).
4. Dispenser according to one of the preceding claims, characterized in that the inner cross- sections of the cup-shaped depression of the drag piston (29b) are substantially precisely adapted to the in particular stepped, tapered outer shape of the casing part of the cylinder casing (3b) of thrust piston pump (1 b) projecting into storage space (28b), in such a way that said casing part fills the depression when the storage space (28b) is empty.
5. Dispenser according to one of the preceding claims, characterized in that the casing part projecting into the storage space (28b) or the thrust piston pump (1 b) and the drag piston (29b) are substantially equiaxial to one another.
6. Dispenser according to one of the preceding claims, characterized in that the drag piston (29b) is provided with two piston lips located at both ends.
7. Dispenser according to claim 6, characterized in that a piston lip is provided at one end of the piston ring and that the cup-shaped sleeve (45) projects over said end.
8. Dispenser according to one of the preceding claims, characterized in that in the line path between the pump piston (4b) and a discharge opening (18b) is provided an axially preloaded exhaust valve (17b), which is opened mechanically in a forcibly controlled manner at the end of the piston stroke and whose closing part (21 b) is preferably formed by an elastic compression sleeve (35), whose outer end (36) is connected to a piston shaft (8b) and in particular with the inner end adjacent to the circular closing part (21 b) forms the circular pump piston (4b).
9. Dispenser according to claim 8, characterized in that at the end of the piston stroke, the pump piston (4b) engages against a stop shoulder (26b) and that the piston shaft (8b) can be moved beyond the stop position of pump piston (4b), accompanied by the opening of exhaust valve (17b).
10. Dispenser according to claims 8 or 9, characterized in that the circular closing part (21 b) of exhaust valve (17b) has a valve closing surface (41) associated with the piston shaft (8b) and located on the inner circumferential face and a stop surface (42) located on the outer circumference, which with the pump piston (4b) returned sealingly engages with pretension on an opposite shoulder (26b) of pump cylinder (3b).
11. Dispenser according to one of the preceding claims, characterized in that, with the pump piston (4b) returned, the pump cylinder (3b) is hermetically sealed in pressure-tight manner with respect to the storage space (28b) and/or the outside and that the valve closing pressure of exhaust valve (17b) is higher than the maximum pressure in storage space (28b).
12. Dispenser according to claims 10 or 11, characterized in that between the piston packing (37) and the seal formed by stop face (42) and the opposite shoulder (26b) is formed a completely closed annulus (43) bounded on the outside by the uninterrupted circumferential casing of pump cylinder (3b).
EP84109706A 1983-10-28 1984-08-15 Dispenser for active materials Expired EP0143183B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8686105985T DE3480057D1 (en) 1983-10-28 1984-08-15 Fluid dispenser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3339180 1983-10-28
DE3339180A DE3339180C2 (en) 1983-10-28 1983-10-28 Discharge device for media

Related Child Applications (1)

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EP86105985.5 Division-Into 1984-08-15

Publications (3)

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EP0143183A2 EP0143183A2 (en) 1985-06-05
EP0143183A3 EP0143183A3 (en) 1986-08-27
EP0143183B1 true EP0143183B1 (en) 1988-06-08

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EP84109706A Expired EP0143183B1 (en) 1983-10-28 1984-08-15 Dispenser for active materials
EP86105985A Expired EP0201809B1 (en) 1983-10-28 1984-08-15 Fluid dispenser

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EP86105985A Expired EP0201809B1 (en) 1983-10-28 1984-08-15 Fluid dispenser

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EP (2) EP0143183B1 (en)
JP (1) JPH0672788B2 (en)
DE (3) DE3339180C2 (en)

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Also Published As

Publication number Publication date
EP0143183A3 (en) 1986-08-27
DE3471912D1 (en) 1988-07-14
EP0201809A1 (en) 1986-11-20
DE3339180A1 (en) 1985-05-09
DE3339180C2 (en) 1993-10-14
EP0201809B1 (en) 1989-10-11
US4944430A (en) 1990-07-31
DE3480057D1 (en) 1989-11-16
JPS60111925A (en) 1985-06-18
US4694977A (en) 1987-09-22
EP0143183A2 (en) 1985-06-05
JPH0672788B2 (en) 1994-09-14

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