EP0497739B1 - Dispensing cartridge with a supply cylinder and an expulsion piston - Google Patents

Dispensing cartridge with a supply cylinder and an expulsion piston Download PDF

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Publication number
EP0497739B1
EP0497739B1 EP92810054A EP92810054A EP0497739B1 EP 0497739 B1 EP0497739 B1 EP 0497739B1 EP 92810054 A EP92810054 A EP 92810054A EP 92810054 A EP92810054 A EP 92810054A EP 0497739 B1 EP0497739 B1 EP 0497739B1
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EP
European Patent Office
Prior art keywords
piston
dispensing cartridge
venting
cartridge according
sealing
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EP92810054A
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German (de)
French (fr)
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EP0497739A2 (en
EP0497739A3 (en
Inventor
Wilhelm A. Keller
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Individual
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Individual
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
    • B05C17/00579—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container comprising means for allowing entrapped air to escape to the atmosphere
    • 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
    • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container
    • B65D83/0033—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container 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
    • 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
    • B65D2205/00—Venting means
    • B65D2205/04—Venting means for venting during the initial insertion of a piston

Definitions

  • the present invention relates to a discharge cartridge according to the preamble of claim 1.
  • a discharge cartridge is known from EP-A-0 344 491 by the same applicant.
  • this discharge cartridge represented an advance over the state of the art, but tests have shown that it can be improved.
  • EP-A-0 463 991 starting from a delivery plunger with ventilation bores, essentially one feature was improved in order to prevent material that flows out when the delivery plunger is pressed in and the ventilation bore is closed, which can lead to disruptive contamination and measures have also been taken, to ensure faster and easier closing.
  • the present invention is aimed at improving another property of the discharge cartridge, at improving the storage of the filling compound, in particular at the long-term storage of aggressive substances. While for many applications it is sufficient to seal the delivery plunger in the cartridge wall using a sealing ring, generally an O-ring, aggressive substances that can attack this O-ring or those that have a low viscosity or extreme creep properties can result in situations which the use of only one sealing element becomes problematic. There are also substances that are sensitive to the penetration of water vapor or gases and thereby change their chemical properties.
  • a squeeze-out piston for containers which has at one end an annular groove for an elastically deformable sealing ring and a sealing lip, but which is dimensioned such that material still passes through reached.
  • the inventive idea disclosed in this document is directed to improving the geometric shape of the ring groove and the geometry of the elastic ring in such a way that a maximum seal is achieved when the piston is pushed into it.
  • the sealing arrangement shown there is not very suitable and no precautions are taken for venting during the filling process.
  • the discharge cartridge 1 with the storage cylinder 2 with its wall 3, the storage cylinder being closed at the bottom by a lockable mouth, not shown.
  • the cylinder 2 there is the precisely weighed amount of the filling compound 4 as well as a delivery piston 50, which as a rule consists of a soft material, preferably plastic.
  • the delivery plunger is sealed against the wall 3 of the supply cylinder 2 by two sealing members and no longer only by one which is arranged at the end of the delivery plunger on the product side .
  • O-ring 51 is now inserted into the cylinder jacket 53 at a distance from the end 52 of the delivery piston, preferably at its other end.
  • a circumferential sealing lip 54 which merges into the piston wall 53 and which forms a circumferential V-shaped groove 55 with the piston crown 58.
  • the sealing lip is flat at the front with the front piston surface.
  • a circumferential cavity 57 serves as a collecting chamber for the wall layer of the filling compound stripped from the O-ring, or if a small amount of filling compound does get behind the sealing lip.
  • vent hole 9 can be closed by a closure 10, which is described in detail in the aforementioned Swiss application and seals the same overflow chamber 17.
  • the bottom surface 58 of the piston contains an arrangement of radially extending ventilation grooves 15 which, in this exemplary embodiment, have a constantly increasing depth toward the ventilation bore 9. Tests have shown that these grooves 15 can also have a uniform depth in order to perform their function correctly. As can be seen from FIG. 1, the number of radially arranged grooves 15 decreases in the central region in order to facilitate manufacture.
  • the delivery piston also has the radial ribs 16 already described in the aforementioned application.
  • the circumferential groove 55 is also vented. This ventilation is achieved in that the radially extending grooves 15 open into the V-shaped circumferential groove 55 at their outer end. As a result, the air can be pressed out of this V-shaped groove completely to the vent hole 9 in order to escape there.
  • the dosing ratio can be maintained exactly, which is particularly the case with multiple discharge cartridges with storage cylinders of different diameters, respectively. Volumes is necessary.
  • the O-ring or other sealing element does not come into contact with the filling compound, or only very slightly, during the storage time, which is particularly important for long storage times and also when it comes to aggressive products.
  • the double sealing system also effectively prevents the penetration of water vapor or gases, which could endanger the chemical stability of the filling compound.
  • the central lip is generally not damaged when the piston is pushed in. This is in contrast to conventional methods which, by introducing venting needles or the like between the piston and the cylinder wall, achieve often incomplete venting and / or damage the sealing member.
  • the delivery piston 60 has, in addition to the first sealing lip 54, a second sealing lip 61, which can be somewhat smaller than the first. Between the sealing lip 54 and the flat bottom 66 of the piston in this example there is the same circumferential groove 55 as in the first example, into which, for example, the same ventilation grooves 15 as in the first example can open.
  • the second sealing lip is not only a safeguard when the first is breached, but also comes into operation if low-viscosity fillers are used.
  • the O-ring 65 is embedded in a recess 63 in the wall 62, which is arranged near the end opposite the sealing lips, which is followed by a second recess 64.
  • sealing lips are not limited to the version with the overflow chamber, but is suitable for all types of delivery pistons in discharge cartridges.

Description

Die vorliegende Erfindung bezieht sich auf eine Austragkartusche gemäss Oberbegriff von Patentanspruch 1. Eine solche Austragkartusche ist aus der EP-A-0 344 491 des gleichen Anmelders bekannt. Diese Austragkartusche stellte damals gegenüber dem Stand der Technik zwar einen Fortschritt dar, doch haben Versuche gezeigt, dass sie verbesserungsfähig ist. In der EP-A-0 463 991 wurde, ausgehend von einem Förderkolben mit Entlüftungsbohrungen, im wesentlichen ein Merkmal verbessert um zu verhindern, dass beim Hineinpressen des Förderkolbens und Verschliessen der Entlüftungsbohrung herausfliessendes Material zu störenden Verschmutzungen führen kann und es wurden ferner Massnahme ergriffen, um ein schnelleres und einfacheres Verschliessen zu gewährleisten.The present invention relates to a discharge cartridge according to the preamble of claim 1. Such a discharge cartridge is known from EP-A-0 344 491 by the same applicant. At the time, this discharge cartridge represented an advance over the state of the art, but tests have shown that it can be improved. In EP-A-0 463 991, starting from a delivery plunger with ventilation bores, essentially one feature was improved in order to prevent material that flows out when the delivery plunger is pressed in and the ventilation bore is closed, which can lead to disruptive contamination and measures have also been taken, to ensure faster and easier closing.

Die vorliegende Erfindung hingegen richtet sich auf die Verbesserung einer anderen Eigenschaft der Austragkartusche, auf die Verbesserung der Aufbewahrung der Füllmasse, insbesondere auf die langfristige Verwahrung von aggressiven Substanzen. Während für viele Anwendungen das Abdichten des Förderkolbens in der Kartuschenwand mittels einem Dichtungsring, im allgemeine O-Ring genügt, können aggressive Substanzen, die diesen O-Ring angreifen können oder durch solche, die eine niedrige Viskosität bzw. exteme Kriecheigenschaften aufweisen Situationen entstehen, in welchen die Verwendung nur eines Dichtorgans problematisch wird. Ausserdem gibt es Substanzen, die gegenüber Eindringen von Wasserdampf oder Gasen empfindlich sind und dadurch ihre chemischen Eigenschaften verändern.The present invention, on the other hand, is aimed at improving another property of the discharge cartridge, at improving the storage of the filling compound, in particular at the long-term storage of aggressive substances. While for many applications it is sufficient to seal the delivery plunger in the cartridge wall using a sealing ring, generally an O-ring, aggressive substances that can attack this O-ring or those that have a low viscosity or extreme creep properties can result in situations which the use of only one sealing element becomes problematic. There are also substances that are sensitive to the penetration of water vapor or gases and thereby change their chemical properties.

Aus der DE-A-3 405 547 ist ein Auspresskolben für Behälter bekannt, der an einem Ende eine Ringnut für einen elastisch verformbaren Dichtring und eine Dichtungslippe aufweist, die aber so bemessen ist, dass Material noch hindurch gelangt. Der in dieser Schrift offenbarte Erfindungsgedanke richtet sich darauf, die geometrische Form der Ringnut und die Geometrie des elastischen Ringes derart zu verbessern, dass beim Hineinstossen des Kolbens eine maximale Dichtung erzielt wird. Für die lange Lagerung hingegen, ist die dort aufgezeigte Dichtungs-Anordnung wenig geeignet und für die Entlüftung während dem Einfüllvorgang sind auch keine Vorkehrungen getroffen.From DE-A-3 405 547 a squeeze-out piston for containers is known which has at one end an annular groove for an elastically deformable sealing ring and a sealing lip, but which is dimensioned such that material still passes through reached. The inventive idea disclosed in this document is directed to improving the geometric shape of the ring groove and the geometry of the elastic ring in such a way that a maximum seal is achieved when the piston is pushed into it. For long storage, however, the sealing arrangement shown there is not very suitable and no precautions are taken for venting during the filling process.

Aus der DE-A-2 607 442 ist ferner eine Ausrüstung zum Austragen von Fugenmassen bekannt, wobei sich diese Masse in einer Kunststoff-Folie befindet und durch einen Kolben ausgepresst wird. Zum Ausbringen der Masse und Abschälen der Kunststoff-Folie von der Zylinderwand weist der Kolben eine zum Austragende weisende spitze Lippe sowie zum Verhindern von Luftzufuhr eine nach hinten gerichtete Lippe auf, wobei zwischen den beiden Lippen eine mit Oel gefüllte Nut vorhanden ist. Hier stellt sich das Problem der Entlüftung beim Füllen der Masse nicht.From DE-A-2 607 442, equipment for discharging jointing compounds is also known, this compound being located in a plastic film and being pressed out by a piston. To dispense the mass and peel the plastic film from the cylinder wall, the piston has a pointed lip pointing towards the discharge end and a rearward-pointing lip to prevent air supply, a groove filled with oil being present between the two lips. The problem of ventilation when filling the mass does not arise here.

Es ist von diesem Stand der Technik ausgehend Aufgabe der Erfindung eine Austragkartusche mit Vorratszylinder und Förderkolben anzugeben, bei der die Ausbildung des Förderkolbens eine annähernd vollständige Entlüftungs beim Einfüllen der Masse ermöglicht und ein Ausfliessen oder eine schädliche Beeinflussung des Kartuscheninhalts sowie eine Beschädigung des äussersten Dichtungsorgan wirksam verhindert wird. Diese Aufgabe wird in Patentanspruch 1 gelöst. In einer Weiterausbildung wird verhindert, dass eine Beschädigung des äussersten Dichtungsorgans Schaden verursacht.Based on this prior art, it is an object of the invention to provide a dispensing cartridge with a storage cylinder and delivery piston, in which the design of the delivery piston enables almost complete ventilation when the mass is poured in, and effectively prevents leakage or a harmful influence on the contents of the cartridge and damage to the outermost sealing element is prevented. This object is solved in claim 1. Further training prevents damage to the outermost sealing element from causing damage.

Die Erfindung wird im folgenden anhand einer Zeichnung von Ausführungsbeispielen näher erläutert.

Fig. 1
zeigt eine Sicht von unten auf den Förderkolben,
Fig. 2
zeigt einen Schnitt gemäss II-II in Fig. 1,
Fig. 3
zeigt im Schnitt den aufgesetzten Förderkolben in der Anfangsstellung vor dem Austragen und
Fig. 4
zeigt im Schnitt ein weiteres Ausführungsbeispiel eines Förderkolbens.
The invention is explained in more detail below with reference to a drawing of exemplary embodiments.
Fig. 1
shows a view from below of the delivery piston,
Fig. 2
shows a section according to II-II in Fig. 1,
Fig. 3
shows in section the attached delivery piston in the initial position before discharge and
Fig. 4
shows in section another embodiment of a delivery piston.

Man erkennt in Fig. 3 die Austragkartusche 1 mit dem Vorratszylinder 2 mit seiner Wand 3, wobei der Vorratszylinder unten durch eine nicht dargestellte abschliessbare Mündung abgeschlossen ist. Im Zylinder 2 befindet sich die genau abgewogene Menge der Füllmasse 4 sowie ein Förderkolben 50, der in der Regel aus einem weichen Material, vorzugsweise Kunststoff, besteht. Abweichend vom Förderkolben gemäss EP-A-344 491 oder gemäss der bereits erwähnten EP-A-463 991 wird der Förderkolben gegenüber der Wand 3 des Vorratszylinders 2 durch zwei Dichtungsorgane abgedichtet und nicht mehr nur durch eines, das am produktseitigen Ende des Förderkolbens angeordnet ist.3 shows the discharge cartridge 1 with the storage cylinder 2 with its wall 3, the storage cylinder being closed at the bottom by a lockable mouth, not shown. In the cylinder 2 there is the precisely weighed amount of the filling compound 4 as well as a delivery piston 50, which as a rule consists of a soft material, preferably plastic. Deviating from the delivery plunger according to EP-A-344 491 or according to EP-A-463 991 already mentioned, the delivery plunger is sealed against the wall 3 of the supply cylinder 2 by two sealing members and no longer only by one which is arranged at the end of the delivery plunger on the product side .

Der sonst übliche Dichtungsring, resp. O-Ring 51, ist nun in einem Abstand vom Ende 52 des Förderkolbens, vorzugsweise an seinem anderen Ende, in dessen Zylindermantel 53 eingelassen. Am produktseitigen Ende 52 des Förderkolbens befindet sich eine umlaufende Dichtungslippe 54, die in die Kolbenwand 53 übergeht und die mit dem Kolbenboden 58 eine umlaufende V-förmige Nut 55 bildet. Wie insbesondere aus Fig. 2 hervorgeht, ist die Dichtungslippe vorne plan mit der vorderen Kolbenfläche.The otherwise usual sealing ring, respectively. O-ring 51 is now inserted into the cylinder jacket 53 at a distance from the end 52 of the delivery piston, preferably at its other end. At the end 52 of the delivery piston on the product side there is a circumferential sealing lip 54 which merges into the piston wall 53 and which forms a circumferential V-shaped groove 55 with the piston crown 58. As can be seen in particular from FIG. 2, the sealing lip is flat at the front with the front piston surface.

An der Stelle, an der der Dichtungsring 51 eingelassen ist, ist die Kolbenwand 53 verdickt, wobei der Aussenumfang dort der gleiche ist wie an der Basis 56 der Dichtungslippe 54, so dass zwischen dieser Basis und der Verdickung, in der der O-Ring eingelassen ist, ein umlaufender Hohlraum 57 (siehe Fig. 3) entsteht. Dieser Hohlraum 57 dient als Auffangskammer für die vom O-Ring abgestreifte Wandschicht der Füllmasse, oder falls doch eine geringe Menge Füllmasse hinter die Dichtungslippe gelangt.At the point at which the sealing ring 51 is embedded, the piston wall 53 is thickened, the outer circumference there being the same as at the base 56 of the sealing lip 54, so that between this base and the thickening in which the O-ring is embedded is, a circumferential cavity 57 (see Fig. 3). This cavity 57 serves as a collecting chamber for the wall layer of the filling compound stripped from the O-ring, or if a small amount of filling compound does get behind the sealing lip.

Die Verwendung einer solchen doppelten Dichtung ist besonders wirkungsvoll in Verbindung mit einem Förderkolben, dessen Boden wirksam entlüftet wird, insbesondere gemäss vorliegendem bevorzugten Ausführungsbeispiel, worin der Boden Entlüftungsnuten und eine Entlüftungsbohrung enthält. Im Gegensatz dazu besteht bei anderen bekannten Entlüftungsmethoden mit Entlüftungsnadeln oder dergleichen die Gefahr der Verletzung der Dichtungslippe. Das ganze Entlüftungssystem mit den sich daraus ergebenden Vorteilen ist ausführlich in der bereits genannten EP-A-463 991, auf die verwiesen wird, beschrieben, so dass verschiedene Elemente hier nur noch summarisch erwähnt werden.The use of such a double seal is particularly effective in connection with a delivery piston, the bottom of which is effectively vented, in particular according to the present preferred embodiment, in which the bottom contains venting grooves and a venting bore. In contrast, with other known venting methods with venting needles or the like there is a risk of damage to the sealing lip. The entire ventilation system with the advantages resulting therefrom is described in detail in the aforementioned EP-A-463 991, to which reference is made, so that various elements are only mentioned here in summary.

Man erkennt in Fig. 2 die dem Kartuscheninhalt 4 zugewandte Bodenfläche 58 des Kolbens, die in Abweichung vom oben genannten Stand der Technik plan und nicht zur Entlüftungsbohrung 9 hin vertieft ausgebildet ist, um ein möglichst vollständiges Austragen der Füllmasse zu erzielen. Die Entlüftungsbohrung 9 ist durch einen Verschluss 10 verschliessbar, der eingehend in der genannten Schweizer Anmeldung beschrieben ist und dieselbe Ueberlaufkammer 17 abdichtet.2 shows the bottom surface 58 of the piston facing the cartridge content 4, which, in deviation from the prior art mentioned above, is flat and not recessed towards the vent hole 9 in order to achieve the most complete discharge of the filling compound. The vent hole 9 can be closed by a closure 10, which is described in detail in the aforementioned Swiss application and seals the same overflow chamber 17.

Die Bodenfläche 58 des Kolbens enthält eine Anordnung von radial verlaufenden Entlüftungsnuten 15, die zur Entlüftungsbohrung 9 hin in diesem Ausführungsbeispiel eine stetig sich vergrössernde Tiefe aufweisen. Versuche haben ergeben, dass diese Nuten 15 auch eine gleichmässige Tiefe aufweisen können, um ihre Funktion richtig zu erfüllen. Wie aus Fig. 1 zu erkennen ist, nimmt die Anzahl von radial angeordneten Nuten 15 im Mittelbereich ab, um die Herstellung zu erleichtern. Ausserdem weist der Förderkolben ebenfalls die bereits in der erwähnten Anmeldung beschriebenen radialen Rippen 16 auf.The bottom surface 58 of the piston contains an arrangement of radially extending ventilation grooves 15 which, in this exemplary embodiment, have a constantly increasing depth toward the ventilation bore 9. Tests have shown that these grooves 15 can also have a uniform depth in order to perform their function correctly. As can be seen from FIG. 1, the number of radially arranged grooves 15 decreases in the central region in order to facilitate manufacture. In addition, the delivery piston also has the radial ribs 16 already described in the aforementioned application.

Wichtig für die vollständige Entlüftung ist, dass auch die umlaufende Nut 55 entlüftet wird. Diese Entlüftung wird dadurch erreicht, dass die radial verlaufenden Nuten 15 an ihrem äusseren Ende in die V-förmige umlaufende Nut 55 münden. Dadurch kann die Luft aus dieser V-förmigen Nut vollständig zur Entlüftungsbohrung 9 gepresst werden, um dort zu entweichen.It is important for complete ventilation that the circumferential groove 55 is also vented. This ventilation is achieved in that the radially extending grooves 15 open into the V-shaped circumferential groove 55 at their outer end. As a result, the air can be pressed out of this V-shaped groove completely to the vent hole 9 in order to escape there.

Durch die vollständige Entlüftung der Bodenfläche des Kolbens kann das Dosierverhältnis exakt eingehalten werden, was insbesondere bei Mehrfach-Austragkartuschen mit Vorratszylindern verschiedener Durchmesser, resp. Volumina notwendig ist. Wie bereits erwähnt, kommt der O-Ring oder sonstiges Dichtungorgan während der Lagerzeit nicht oder nur sehr geringfügig mit der Füllmasse in Berührung, was insbesondere für lange Lagerzeiten wichtig ist und auch wenn es sich um agressive Produkte handelt. Andererseits verhindert das doppelte Dichtungssystem auch wirksam das Eindringen von Wasserdampf oder Gasen, die die chemische Stabilität der Füllmasse gefährden könnten.Due to the complete venting of the bottom surface of the piston, the dosing ratio can be maintained exactly, which is particularly the case with multiple discharge cartridges with storage cylinders of different diameters, respectively. Volumes is necessary. As already mentioned, the O-ring or other sealing element does not come into contact with the filling compound, or only very slightly, during the storage time, which is particularly important for long storage times and also when it comes to aggressive products. On the other hand, the double sealing system also effectively prevents the penetration of water vapor or gases, which could endanger the chemical stability of the filling compound.

Die Dichtungslippe wird bei zentraler Entlüftung beim Hineinstossen des Kolbens im allgemeinen nicht verletzt. Dies im Gegensatz zu herkömmlichen Verfahren, die durch Einbringen von Entlüftungsnadeln oder dergleichen zwischen Kolben und Zylinderwand eine oft unvollständige Entlüftung erzielen und/oder das Dichtungsorgan beschädigen.The central lip is generally not damaged when the piston is pushed in. This is in contrast to conventional methods which, by introducing venting needles or the like between the piston and the cylinder wall, achieve often incomplete venting and / or damage the sealing member.

Es kann jedoch vorkommen, dass bei der Herstellung oder beim Transport oder beim unsachgemässen Hineinstossen des Kolbens gemäss den Figuren 1-3 die Dichtungslippe verletzt wird, was unangenehme Folgen haben kann. Um solchen Schäden vorzubeugen ist gemäss Figur 4 vorgesehen, zwei Dichtungslippen anzuordnen.However, it can happen that the sealing lip is damaged during manufacture or transport or when the piston is pushed in incorrectly according to FIGS. 1-3, which can have unpleasant consequences. In order to prevent such damage, provision is made according to FIG. 4 to arrange two sealing lips.

Der Förderkolben 60 weist neben der ersten Dichtungslippe 54 wie beim ersten Kolben 50 eine zweite Dichtungslippe 61 auf, die etwas kleiner als die erste sein kann. Zwischen der Dichtungslippe 54 und dem in diesem Beispiel ebenen Boden 66 des Kolbens befindet sich die gleiche umlaufende Nut 55 wie beim ersten Beispiel, in die beispielsweise die gleichen Entlüftungsnuten 15 wie beim ersten Beispiel münden können.As with the first piston 50, the delivery piston 60 has, in addition to the first sealing lip 54, a second sealing lip 61, which can be somewhat smaller than the first. Between the sealing lip 54 and the flat bottom 66 of the piston in this example there is the same circumferential groove 55 as in the first example, into which, for example, the same ventilation grooves 15 as in the first example can open.

Die zweite Dichtungslippe stellt nicht nur eine Sicherung bei Verletzung der ersten dar sondern tritt dann in Funktion, falls dünnflüssige Füllmassen verwendet werden. Entsprechend dem ersten Beispiel ist der O-Ring 65 in einer Ausnehmung 63 in Wand 62 eingelassen, die nahe dem den Dichtungslippen entgegengesetzten Ende angeordnet ist, der sich eine zweite Ausnehmung 64 anschliesst.The second sealing lip is not only a safeguard when the first is breached, but also comes into operation if low-viscosity fillers are used. According to the first example, the O-ring 65 is embedded in a recess 63 in the wall 62, which is arranged near the end opposite the sealing lips, which is followed by a second recess 64.

Die Verwendung von zwei Dichtungslippen ist nicht auf die Ausführung mit der Ueberlaufkammer beschränkt sondern für alle Arten Förderkolben in Austragkartuschen geeignet.The use of two sealing lips is not limited to the version with the overflow chamber, but is suitable for all types of delivery pistons in discharge cartridges.

Claims (9)

  1. Dispensing cartridge (1) comprising a storage cylinder (2) and a feeding piston (50) in whose wall (53) a sealing ring (51) is inserted, the bottom surface (58, 66) of said feeding piston facing the cartridge contents (4) having radially extending venting grooves (15) which communicate with a centrally disposed venting bore (9), characterised in that said sealing ring (51) is inserted at a distance from the end (52) of said feeding piston facing the cartridge contents, and said end (52) is additionally provided with at least one sealing lip (54, 61) whose open end faces the cartridge contents and which forms, together with the cartridge bottom (52, 66), a circular, V-shaped groove (55) which communicates with the other ends of said venting grooves (15).
  2. Dispensing cartridge according to claim 1, characterised in that the end (52) of said feeding piston (52) comprises two sealing lips (54, 66) which are arranged at a distance from each other, the sealing lip which is nearest to the end (52) of said feeding piston forming said V-shaped groove (55), and the open ends of both sealing lips facing the cartridge contents.
  3. Dispensing cartridge according to claim 2, characterised in that said sealing lips are manufactured in one piece with the wall (53) of said feeding piston.
  4. Dispensing cartridge according to any one of claims 1 to 3, characterised in that said sealing ring (51) is inserted in a thickening of the piston wall (53), and a circular cavity (57) serving as a collecting chamber is formed between said thickening and said sealing lip (54).
  5. Dispensing cartridge according to any one of claims 1 to 4, characterised in that said bottom surface (58, 66) of the feeding piston (50, 60) is plane.
  6. Dispensing cartridge according to any one of claims 1 to 5, characterised in that said bottom surface (58) of the feeding piston (50) is continuously recessed from the piston rim towards said venting bore (9).
  7. Dispensing cartridge according to any one of claims 1 to 6, characterised in that said venting grooves (15) have a constant depth.
  8. Dispensing cartridge according to any one of claims 1 to 6, characterised in that the depth of said venting grooves (15) is continuously increasing from the piston rim towards said venting bore (9).
  9. Dispensing cartridge according to any one of claims 1 to 8, characterised in that an overflow chamber (17) is disposed around said venting bore (9), said chamber being closed by a closure (10) as is said venting bore.
EP92810054A 1991-01-29 1992-01-27 Dispensing cartridge with a supply cylinder and an expulsion piston Expired - Lifetime EP0497739B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH269/91 1991-01-29
CH26991 1991-01-29

Publications (3)

Publication Number Publication Date
EP0497739A2 EP0497739A2 (en) 1992-08-05
EP0497739A3 EP0497739A3 (en) 1993-03-10
EP0497739B1 true EP0497739B1 (en) 1996-10-09

Family

ID=4183158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810054A Expired - Lifetime EP0497739B1 (en) 1991-01-29 1992-01-27 Dispensing cartridge with a supply cylinder and an expulsion piston

Country Status (5)

Country Link
US (1) US5400926A (en)
EP (1) EP0497739B1 (en)
JP (1) JP3347759B2 (en)
KR (1) KR100239097B1 (en)
DE (1) DE59207301D1 (en)

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EP1514611A2 (en) 2003-09-10 2005-03-16 Heraeus Kulzer GmbH Closing piston for catridges having venting and barrier properties
DE102008000841A1 (en) 2008-03-26 2009-10-01 Adcatec Gmbh Cartridge and piston with ventilation device
WO2023088681A1 (en) * 2021-11-17 2023-05-25 Fischerwerke Gmbh & Co. Kg Cartridge for filling, and filled cartridge

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TWM287294U (en) * 2005-10-25 2006-02-11 Guo-Jung Fang Bottle with pumping device for shampoo, lotion, or the like
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Publication number Priority date Publication date Assignee Title
EP1514611A2 (en) 2003-09-10 2005-03-16 Heraeus Kulzer GmbH Closing piston for catridges having venting and barrier properties
US7353972B2 (en) 2003-09-10 2008-04-08 Heraues Kulzer Gmbh & Co. Kg Sealing piston for cartridges with de-aeration and barrier properties
DE102008000841A1 (en) 2008-03-26 2009-10-01 Adcatec Gmbh Cartridge and piston with ventilation device
DE102008000841B4 (en) * 2008-03-26 2014-04-30 Adcatec Gmbh Cartridge and piston with ventilation device
WO2023088681A1 (en) * 2021-11-17 2023-05-25 Fischerwerke Gmbh & Co. Kg Cartridge for filling, and filled cartridge

Also Published As

Publication number Publication date
EP0497739A2 (en) 1992-08-05
KR100239097B1 (en) 2000-03-02
DE59207301D1 (en) 1996-11-14
KR920015059A (en) 1992-08-26
JP3347759B2 (en) 2002-11-20
EP0497739A3 (en) 1993-03-10
US5400926A (en) 1995-03-28
JPH06100053A (en) 1994-04-12

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