EP2116484A1 - Piston for a cartridge and cartridge - Google Patents

Piston for a cartridge and cartridge Download PDF

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Publication number
EP2116484A1
EP2116484A1 EP09005287A EP09005287A EP2116484A1 EP 2116484 A1 EP2116484 A1 EP 2116484A1 EP 09005287 A EP09005287 A EP 09005287A EP 09005287 A EP09005287 A EP 09005287A EP 2116484 A1 EP2116484 A1 EP 2116484A1
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EP
European Patent Office
Prior art keywords
piston
cartridge
seal
parts
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09005287A
Other languages
German (de)
French (fr)
Inventor
Jürgen Grün
Frank Schwaab
Clemens Schmidt
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.)
Fischerwerke GmbH and Co KG
Original Assignee
Fischerwerke GmbH and Co KG
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 Fischerwerke GmbH and Co KG filed Critical Fischerwerke GmbH and Co KG
Publication of EP2116484A1 publication Critical patent/EP2116484A1/en
Withdrawn legal-status Critical Current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
    • B65D83/0055—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents
    • B65D83/0072—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents the contents of a flexible bag being expelled by a piston or a movable bottom or partition provided in the container or the package
    • 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
    • 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
    • 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
    • B05C17/00583—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 the container for the material to be dispensed being deformable

Definitions

  • the invention relates to a piston for extruding a flowable mass from a cartridge according to the preamble of claim 1 and such a cartridge according to the preamble of claim 9.
  • Cartridges for storing and squeezing a flowable, such as pasty mass are known, inter alia, in the construction sector.
  • the mass may be contained in a foil pouch.
  • the cartridge may contain two or more components, each contained in their own foil bags and pressed together.
  • the film bags can be fully or partially, linear or point-like, for example, by gluing or plastic welding connected to the cartridge.
  • a piston in the cartridge is displaceable.
  • the plunger should successively release the foil pouch (s), if present and attached to the cartridge, and should seal the cartridge to allow leakage of the mass that may have escaped from the foil pouch between the plunger and the cartridge during extrusion to avoid and also prevent air ingress because of the associated entry of humidity.
  • the object of the invention is to propose a suitable piston and a cartridge with such a piston.
  • the piston according to the invention has a circumferential shear edge for detachment of the film bag (s) from an inner side of the cartridge, where the term “circulating” does not necessarily mean “completely circulating", since the shearing action does not necessarily have to be achieved over the entire circumference.
  • the piston according to the invention has a peripheral seal for hermetically sealing the cartridge.
  • the shearing edge and the seal are connected to each other, whereby they can also be indirectly connected via another part.
  • the compound enables a production of the shearing edge of another, in particular harder material than the seal, which consists in particular of a rubber-elastic material.
  • the invention makes it possible to choose a material suitable for the shearing edge and independently of this the choice of a different material suitable for the seal. As a result, both the shearing function of the shearing edge and the sealing function of the seal of the piston according to the invention can be optimized.
  • a preferred embodiment of the invention provides that the piston has two parts matching in shape piston parts.
  • One of the two piston parts has the shearing edge, the other the seal.
  • the two piston parts are connected to the piston with each other, for example by means of a snap or locking connection. Due to their matching shape, the two piston parts in the same injection mold can be produced one after the other and from different materials.
  • the shearing edge has the same shape as the seal, for example, the seal on a circumferential sealing edge.
  • An embodiment of the invention provides a circumferential sealing lip as a seal.
  • the shape of the sealing lip is also suitable for the shearing edge when the latter are made of a material of higher rigidity and the sealing lip of a material of higher elasticity.
  • An embodiment of the invention provides a snap or snap connection connecting the shear edge and the seal.
  • a snap or locking connection can be formed without additional parts and the items are connected to the piston with minimal effort.
  • a snap or locking connection is suitable for automated connection and thus for mass production.
  • the shearing edge is arranged in the extrusion direction in front of the seal, so that it dissolves a foil bag when pressed in front of the seal of the cartridge.
  • the seal trailing in the extrusion direction ensures that any mass escaping from the foil bag does not pass by the piston and prevents the ingress of atmospheric moisture.
  • the foil bag can be damaged during pressing, so that the mass contained in it emerges.
  • the piston has a reservoir for the mass, which may for example be formed by a space between the shear edge and the seal having the piston part.
  • An inlet opening of the reservoir is located between the shearing edge and the seal. The inlet opening can be circumferential. Through the inlet opening, mass which passes by the shearing edge passes into the reservoir of the piston.
  • an embodiment of the invention provides a vent opening in the piston, which can be closed for example by means of a plug.
  • a preferred embodiment of the invention provides that both piston parts have ventilation openings and that the piston parts are rotatable relative to one another.
  • a rotational position communicate the vents of the two piston parts or in any case covers the one piston part the vent in the other piston part not from.
  • the two piston parts of the piston can be introduced into a cartridge and thereby escape air through the vent opening of the piston parts of the cartridge.
  • the one piston member closes the vent opening of the other piston part, so that when the cartridge is pressed, the flowable mass can not escape through the vents of the piston parts.
  • inventive piston 1 has two piston parts 2, 3, in FIG. 1 as items and in FIG. 2 are shown assembled to the piston 1.
  • the two piston parts 2, 3 are identical in their shape and size, but consist of different plastics. Due to the matching shape, the two piston parts 2, 3 in the same injection mold, but not simultaneously produced.
  • the one piston part 2 has a circumferential shear edge 4, the other piston part 3 has a circumferential sealing lip 5 with a sealing edge 6 as a seal.
  • the one, the shear edge 4 having piston part 2 consists of a hard, so rigid plastic, the other, the sealing lip 5 having piston part 3 is made of an elastic plastic, which is suitable as a material for a seal.
  • the piston part 2 Due to the matching shape of the two piston parts 2, 3, the piston part 2 has a circumferential lip 7, whose cross section corresponds to the cross section of the sealing lip 5 and whose peripheral edge forms the shearing edge 4.
  • the lip 7 and the sealing lip 5 in one piece in a circular disk-shaped base 8 over.
  • the collar 9 are hook-shaped (see. FIGS. 3 and 4 ).
  • the lip 7 and the sealing lip 5 on a circumferential, inwardly projecting bead 12 which cooperates with the collar 9: the bead 12 of the sealing lip 5 forms with the collar 9 of the shear edge 4 having piston part 2 a snap connection 13, the two piston parts 2, 3 as in Figures 2 . 3 and 4 to see comparable to a push button by snapping connects.
  • the two piston parts 2, 3 can also be connected vice versa as shown by snapping the snap connection 13, but it is provided to arrange the piston part 2 having the shearing edges 4 in an extrusion direction in front of the other piston part 3, which has the sealing lip 5. So it is the collar 9 snapped on the bead 12 on the inside of the sealing lip 5 and the shearing edge 4 is free from the piston 1 from.
  • the piston 1, which comprises the two piston parts 2, 3, which are connected to each other with the snap connection 13, received in a cartridge 15.
  • the cartridge 15 contains a flowable, for example, pasty mass, which can be pressed out by moving the piston 1.
  • the cartridge 15 may include a plurality of, for example, two components, which are contained separately in foil bags in the cartridge 15.
  • the film bags, not shown as such, abut against an inner side of a wall of the cartridge 15 and are fixed to the inside of the cartridge 15, for example in a line with a glued or plastic weld seam 16 running in the longitudinal direction of the cartridge 15.
  • the shearing edge 4 of the piston 1 releases the foil bags from the inside of the cartridge 15.
  • the sealing lip 5 prevents that Mass past the piston 1 from the cartridge 15 exits. In addition, the sealing lip 5 prevents the entry of air into the cartridge connected to an entry of humidity.
  • the mass leaked out of the foil bag is directed inwards by the sealing lip 5 and enters through the slits 10 of the collar 9 into an intermediate space between the base surfaces 8 of the two piston parts 2, 3.
  • the space between the base surfaces 8 forms a reservoir 17 for the leaked from the foil pouch and the shearing edge 4 "overrun" mass, the slots 10 of the collar 9 form inlet openings for the reservoir 17.
  • the sealing lip 5 seals due to their elasticity in the range of Unevenness on the inside of the cartridge 15, so for example in the field of adhesive or plastic weld 16, from.
  • the two piston parts 2, 3 each have a vent opening 18. This has the form of a cylindrical hole in the embodiment and is arranged eccentrically parallel to the axis at a point at which a radial rib 21 abuts a tubular rib 20.
  • the piston parts 2, 3 connected by snap-fitting snap-fit are rotatable relative to one another, so that the ventilation openings 18 of the two piston parts 2, 3 aligned and thus merge into each other.
  • the piston 1 can be introduced into the cartridge 15 and escape air from the cartridge 15 through the vent openings 18.
  • the one piston part 2 closes the vent opening 18 of the other piston part 3, as in FIG. 4 you can see.
  • the piston parts 2, 3 calotte-shaped closure pins 19 which are arranged so that by rotation of the piston parts 2, 3 against each other, the closure pin 19 of the one piston part 2 can be brought into coincidence with the vent opening 18 of the other piston part 3, as it in FIG. 4 you can see. If the vent opening 18 is closed against each other by the rotation of the two piston parts 2, 3, no flowable mass can escape through the vent openings 18 in the piston 1 when the cartridge 15 is pressed out.

Abstract

The piston (1) has a piston part (2) with a circular shearing edge (4), which separates a foil bag from an inner side of a cartridge (15). A piston part (3) includes a circular seal (5) i.e. circular lip seal, sealing the piston in the cartridge. The edge and the seal are connected with each other by a snap-in or lock connection, where shape of the edge corresponds with the lip seal. A reservoir (17) with an inlet opening (10) is arranged between the edge and the seal. The piston parts include air inlet openings, which communicate with each other in a rotational position of the parts.

Description

Die Erfindung betrifft einen Kolben zum Auspressen einer fließfähigen Masse aus einer Kartusche gemäß dem Oberbegriff des Anspruchs 1 und eine solche Kartusche gemäß dem Oberbegriff des Anspruchs 9.The invention relates to a piston for extruding a flowable mass from a cartridge according to the preamble of claim 1 and such a cartridge according to the preamble of claim 9.

Kartuschen zum Aufbewahren und Auspressen einer fließfähigen, beispielsweise pastösen Masse sind u.a. im Baubereich bekannt. Zur Befüllung oder Wiederbefüllung der Kartusche kann die Masse in einem Folienbeutel enthalten sein. Auch kann die Kartusche zwei oder mehr Komponenten enthalten, die jeweils in eigenen Folienbeuteln enthalten sind und gemeinsam ausgepresst werden. Die Folienbeutel können voll- oder teilflächig, linienförmig oder punktförmig beispielsweise durch Kleben oder Kunststoffschweißen mit der Kartusche verbunden sein. In diesem Zusammenhang soll unter einem Folienbeutel insbesondere auch ein Blasformteil wie aus der Druckschrift DE 10 2004 056 908 A1 bekannt, oder eine dünne Trennwand verstanden werden, die einen Teil des Innenraums der Kartusche abtrennt, wie aus der Druckschrift DE 10 2005 017 599 A1 bekannt.Cartridges for storing and squeezing a flowable, such as pasty mass are known, inter alia, in the construction sector. To fill or refill the cartridge, the mass may be contained in a foil pouch. Also, the cartridge may contain two or more components, each contained in their own foil bags and pressed together. The film bags can be fully or partially, linear or point-like, for example, by gluing or plastic welding connected to the cartridge. In this context, under a foil bag in particular also a blow molding as in the publication DE 10 2004 056 908 A1 known or a thin partition to be understood, which separates a part of the interior of the cartridge, as from the document DE 10 2005 017 599 A1 known.

Zum Auspressen der fließfähigen Masse ist ein Kolben in der Kartusche verschiebbar. Der Kolben sollte den oder die Folienbeutel, sofern vorhanden und mit der Kartusche verbunden, sukzessive von der Kartusche lösen und er sollte die Kartusche abdichten, um einen Austritt der Masse, die eventuell aus dem Folienbeutel ausgetreten ist, zwischen dem Kolben und der Kartusche beim Auspressen zu vermeiden und ebenfalls einen Lufteintritt wegen des damit verbundenen Eintrags von Luftfeuchtigkeit verhindern.To express the flowable mass, a piston in the cartridge is displaceable. The plunger should successively release the foil pouch (s), if present and attached to the cartridge, and should seal the cartridge to allow leakage of the mass that may have escaped from the foil pouch between the plunger and the cartridge during extrusion to avoid and also prevent air ingress because of the associated entry of humidity.

Aufgabe der Erfindung ist, einen hierfür geeigneten Kolben und eine Kartusche mit einem solchen Kolben vorzuschlagen.The object of the invention is to propose a suitable piston and a cartridge with such a piston.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale der Ansprüche 1 und 9 gelöst. Der erfindungsgemäße Kolben weist eine umlaufende Scherkante zum Ablösen des oder der Folienbeutel/s von einer Innenseite der Kartusche auf, wobei mit dem Begriff "umlaufend" nicht zwingend "vollständig umlaufend" gemeint ist, da die Scherwirkung nicht notwendigerweise über den gesamten Umfang erzielt werden muss. Außerdem weist der erfindungsgemäße Kolben eine umlaufende Dichtung zum hermetischen Abdichten der Kartusche auf. Die Scherkante und die Dichtung sind miteinander verbunden, wobei sie auch mittelbar über ein weiteres Teil verbunden sein können. Die Verbindung ermöglicht eine Herstellung der Scherkante aus einem anderen, insbesondere härteren Material als die Dichtung, die insbesondere aus einem gummielastischen Werkstoff besteht. Die Erfindung ermöglicht die Wahl eines für die Scherkante geeigneten Werkstoffs und davon unabhängig die Wahl eines für die Dichtung geeigneten, anderen Werkstoffs. Dadurch lassen sich sowohl die Scherfunktion der Scherkante als auch die Dichtfunktion der Dichtung des erfindungsgemäßen Kolbens optimieren.This object is achieved by the features of claims 1 and 9. The piston according to the invention has a circumferential shear edge for detachment of the film bag (s) from an inner side of the cartridge, where the term "circulating" does not necessarily mean "completely circulating", since the shearing action does not necessarily have to be achieved over the entire circumference. In addition, the piston according to the invention has a peripheral seal for hermetically sealing the cartridge. The shearing edge and the seal are connected to each other, whereby they can also be indirectly connected via another part. The compound enables a production of the shearing edge of another, in particular harder material than the seal, which consists in particular of a rubber-elastic material. The invention makes it possible to choose a material suitable for the shearing edge and independently of this the choice of a different material suitable for the seal. As a result, both the shearing function of the shearing edge and the sealing function of the seal of the piston according to the invention can be optimized.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass der Kolben zwei in ihrer Form übereinstimmende Kolbenteile aufweist. Eines der beiden Kolbenteile weist die Scherkante auf, das andere die Dichtung. Die beiden Kolbenteile sind zum Kolben miteinander verbunden, beispielsweise mittels einer Schnapp- oder Rastverbindung. Durch ihre übereinstimmende Form können die beiden Kolbenteile in derselben Spritzgießform nacheinander und aus verschiedenen Werkstoffen hergestellt werden. Hierbei hat die Scherkante dieselbe Form wie die Dichtung, beispielsweise weist die Dichtung eine umlaufende Dichtkante auf.A preferred embodiment of the invention provides that the piston has two parts matching in shape piston parts. One of the two piston parts has the shearing edge, the other the seal. The two piston parts are connected to the piston with each other, for example by means of a snap or locking connection. Due to their matching shape, the two piston parts in the same injection mold can be produced one after the other and from different materials. Here, the shearing edge has the same shape as the seal, for example, the seal on a circumferential sealing edge.

Eine Ausgestaltung der Erfindung sieht eine umlaufende Dichtlippe als Dichtung vor. Die Form der Dichtlippe eignet sich auch für die Scherkante, wenn letztere aus einem Material höherer Steifigkeit und die Dichtlippe aus einem Material höherer Elastizität hergestellt sind.An embodiment of the invention provides a circumferential sealing lip as a seal. The shape of the sealing lip is also suitable for the shearing edge when the latter are made of a material of higher rigidity and the sealing lip of a material of higher elasticity.

Eine Ausgestaltung der Erfindung sieht eine Schnapp- oder Rastverbindung vor, die die Scherkante und die Dichtung verbindet. Eine Schnapp- oder Rastverbindung ist ohne Zusatzteile ausbildbar und die Einzelteile sind mit minimalem Aufwand zum Kolben verbindbar. Eine Schnapp- oder Rastverbindung eignet sich zu einem automatisierten Verbinden und somit für eine Serienfertigung.An embodiment of the invention provides a snap or snap connection connecting the shear edge and the seal. A snap or locking connection can be formed without additional parts and the items are connected to the piston with minimal effort. A snap or locking connection is suitable for automated connection and thus for mass production.

Vorzugsweise ist die Scherkante in Auspressrichtung vor der Dichtung angeordnet, damit sie einen Folienbeutel beim Auspressen vor der Dichtung von der Kartusche löst.Preferably, the shearing edge is arranged in the extrusion direction in front of the seal, so that it dissolves a foil bag when pressed in front of the seal of the cartridge.

Die in Auspressrichtung nachlaufende Dichtung sorgt dafür, dass eventuell aus dem Folienbeutel austretende Masse nicht am Kolben vorbeitritt und verhindert den Zutritt von Luftfeuchtigkeit. Der Folienbeutel kann beim Auspressen beschädigt werden, so dass die in ihm enthaltene Masse austritt. Der Kolben weist ein Reservoir für die Masse auf, das beispielsweise von einem Raum zwischen dem die Scherkante und dem die Dichtung aufweisenden Kolbenteil gebildet sein kann. Eine Eintrittsöffnung des Reservoirs befindet sich zwischen der Scherkante und der Dichtung. Die Eintrittsöffnung kann umlaufend sein. Durch die Eintrittsöffnung gelangt Masse, die an der Scherkante vorbeitritt, in das Reservoir des Kolbens.The seal trailing in the extrusion direction ensures that any mass escaping from the foil bag does not pass by the piston and prevents the ingress of atmospheric moisture. The foil bag can be damaged during pressing, so that the mass contained in it emerges. The piston has a reservoir for the mass, which may for example be formed by a space between the shear edge and the seal having the piston part. An inlet opening of the reservoir is located between the shearing edge and the seal. The inlet opening can be circumferential. Through the inlet opening, mass which passes by the shearing edge passes into the reservoir of the piston.

Damit beim Einbringen des Kolbens in die Kartusche Luft entweichen kann, sieht eine Ausgestaltung der Erfindung eine Entlüftungsöffnung im Kolben vor, die beispielsweise mittels eines Stopfens verschließbar ist.So that air can escape during the introduction of the piston into the cartridge, an embodiment of the invention provides a vent opening in the piston, which can be closed for example by means of a plug.

Ist der Kolben aus zwei übereinstimmenden Kolbenteilen zusammengesetzt, sieht eine bevorzugte Ausgestaltung der Erfindung vor, dass beide Kolbenteile Entlüftungsöffnungen aufweisen und dass die Kolbenteile gegeneinander drehbar sind. In einer Drehstellung kommunizieren die Entlüftungsöffnungen der beiden Kolbenteile oder jedenfalls deckt das eine Kolbenteil die Entlüftungsöffnung im anderen Kolbenteil nicht ab. In dieser Drehstellung der beiden Kolbenteile kann der Kolben in eine Kartusche eingebracht werden und dabei Luft durch die Entlüftungsöffnung der Kolbenteile aus der Kartusche entweichen. In einer anderen Drehstellung der Kolbenteile zueinander verschließt das eine Kolbenteil die Entlüftungsöffnung des anderen Kolbenteils, so dass beim Auspressen der Kartusche die fließfähige Masse nicht durch die Entlüftungsöffnungen der Kolbenteile entweichen kann.If the piston is composed of two matching piston parts, a preferred embodiment of the invention provides that both piston parts have ventilation openings and that the piston parts are rotatable relative to one another. In a rotational position communicate the vents of the two piston parts or in any case covers the one piston part the vent in the other piston part not from. In this rotational position of the two piston parts of the piston can be introduced into a cartridge and thereby escape air through the vent opening of the piston parts of the cartridge. In another rotational position of the piston parts to each other, the one piston member closes the vent opening of the other piston part, so that when the cartridge is pressed, the flowable mass can not escape through the vents of the piston parts.

Der Anspruch 9 ist anhand der vorstehenden Ausführungen zum Kolben der Kartusche erläutert worden, es wird insoweit auf die vorstehenden Ausführungen verwiesen.The claim 9 has been explained with reference to the above comments on the piston of the cartridge, it is so far referred to the above statements.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

Figur 1
einen Kolben gemäß der Erfindung in perspektivischer Explosionsdarstellung;
Figur 2
den Kolben aus Figur 1 in zusammengesetztem Zustand;
Figur 3
einen Abschnitt einer Kartusche mit dem Kolben aus Figuren 1 und 2 gemäß der Erfindung in einer Achsschnittdarstellung; und
Figur 4
einen Figur 3 entsprechenden Achsschnitt mit geändertem Blickwinkel auf den Kolben.
The invention will be explained in more detail with reference to an embodiment shown in the drawing. Show it:
FIG. 1
a piston according to the invention in an exploded perspective view;
FIG. 2
the piston off FIG. 1 in assembled condition;
FIG. 3
a section of a cartridge with the piston Figures 1 and 2 according to the invention in an Achsschnittdarstellung; and
FIG. 4
one FIG. 3 corresponding axial section with a modified angle of view on the piston.

Der in Figuren 1 und 2 dargestellte, erfindungsgemäße Kolben 1 weist zwei Kolbenteile 2, 3 auf, die in Figur 1 als Einzelteile und in Figur 2 zum Kolben 1 zusammengesetzt dargestellt sind. Die beiden Kolbenteile 2, 3 sind in ihrer Form und Größe identisch, bestehen allerdings aus verschiedenen Kunststoffen. Aufgrund der übereinstimmenden Form können die beiden Kolbenteile 2, 3 in derselben Spritzgießform, allerdings nicht gleichzeitig, hergestellt werden.The in Figures 1 and 2 illustrated, inventive piston 1 has two piston parts 2, 3, in FIG. 1 as items and in FIG. 2 are shown assembled to the piston 1. The two piston parts 2, 3 are identical in their shape and size, but consist of different plastics. Due to the matching shape, the two piston parts 2, 3 in the same injection mold, but not simultaneously produced.

Das eine Kolbenteil 2 weist eine umlaufende Scherkante 4 auf, das andere Kolbenteil 3 weist eine umlaufende Dichtlippe 5 mit einer Dichtkante 6 als Dichtung auf. Das eine, die Scherkante 4 aufweisende Kolbenteil 2 besteht aus einem harten, also biegesteifen Kunststoff, das andere, die Dichtlippe 5 aufweisende Kolbenteil 3 besteht aus einem elastischen Kunststoff, der als Werkstoff für eine Dichtung geeignet ist. Aufgrund der übereinstimmenden Form der beiden Kolbenteile 2, 3 weist das eine Kolbenteil 2 eine umlaufende Lippe 7 auf, deren Querschnitt dem Querschnitt der Dichtlippe 5 entspricht und deren umlaufende Kante die Scherkante 4 bildet. An ihrem Fuß gehen die Lippe 7 und die Dichtlippe 5 einstückig in eine kreisscheibenförmige Grundfläche 8 über. In der Mitte weist die Grundfläche 8 auf der Seite des Kragens 9 eine rohrförmige Aufnahme 14 für eine nicht dargestellte Kolbenstange auf (Figur 3).The one piston part 2 has a circumferential shear edge 4, the other piston part 3 has a circumferential sealing lip 5 with a sealing edge 6 as a seal. The one, the shear edge 4 having piston part 2 consists of a hard, so rigid plastic, the other, the sealing lip 5 having piston part 3 is made of an elastic plastic, which is suitable as a material for a seal. Due to the matching shape of the two piston parts 2, 3, the piston part 2 has a circumferential lip 7, whose cross section corresponds to the cross section of the sealing lip 5 and whose peripheral edge forms the shearing edge 4. At its foot, the lip 7 and the sealing lip 5 in one piece in a circular disk-shaped base 8 over. In the middle, the base 8 on the side of the collar 9, a tubular receptacle 14 for a piston rod, not shown ( FIG. 3 ).

In entgegengesetzter Richtung wie die Lippe 7 und Dichtlippe 5 steht von den beiden Kolbenteilen 2, 3 ein rohrförmiger Kragen 9 ab, der durch Schlitze 10 in Segmente 11 unterteilt ist. Im Querschnitt sind die Kragen 9 hakenförmig (vgl. Figuren 3 und 4). Auf ihrer Innenseite weisen die Lippe 7 und die Dichtlippe 5 einen umlaufenden, nach innen stehenden Wulst 12 auf, der mit den Kragen 9 zusammenwirkt: der Wulst 12 der Dichtlippe 5 bildet mit dem Kragen 9 des die Scherkante 4 aufweisenden Kolbenteils 2 eine Schnappverbindung 13, die die beiden Kolbenteile 2, 3 wie in Figuren 2, 3 und 4 zu sehen vergleichbar einem Druckknopf durch Einschnappen verbindet. Durch die Unterteilung der Kragen 9 mit den Schlitzen 10 in Segmente 11 ist eine elastische Verformbarkeit erhöht, um die Schnappverbindung 13 einschnappen zu können. Grundsätzlich können die beiden Kolbenteile 2, 3 auch umgekehrt wie dargestellt durch Einschnappen der Schnappverbindung 13 verbunden sein, es ist allerdings vorgesehen, das die Scherkanten 4 aufweisende Kolbenteil 2 in einer Auspressrichtung vor dem anderen Kolbenteil 3 anzuordnen, das die Dichtlippe 5 aufweist. Es ist also der Kragen 9 am Wulst 12 auf der Innenseite der Dichtlippe 5 eingeschnappt und die Scherkante 4 steht frei vom Kolben 1 ab.In the opposite direction as the lip 7 and sealing lip 5 is from the two piston parts 2, 3 from a tubular collar 9, which is divided by slots 10 into segments 11. In cross section, the collar 9 are hook-shaped (see. FIGS. 3 and 4 ). On its inner side, the lip 7 and the sealing lip 5 on a circumferential, inwardly projecting bead 12 which cooperates with the collar 9: the bead 12 of the sealing lip 5 forms with the collar 9 of the shear edge 4 having piston part 2 a snap connection 13, the two piston parts 2, 3 as in Figures 2 . 3 and 4 to see comparable to a push button by snapping connects. By dividing the collar 9 with the slots 10 in segments 11 an elastic deformability is increased in order to snap the snap connection 13 can. In principle, the two piston parts 2, 3 can also be connected vice versa as shown by snapping the snap connection 13, but it is provided to arrange the piston part 2 having the shearing edges 4 in an extrusion direction in front of the other piston part 3, which has the sealing lip 5. So it is the collar 9 snapped on the bead 12 on the inside of the sealing lip 5 and the shearing edge 4 is free from the piston 1 from.

Wie in Figuren 3 und 4 zu sehen, ist der Kolben 1, der die beiden Kolbenteile 2, 3 umfasst, die mit der Schnappverbindung 13 miteinander verbunden sind, in einer Kartusche 15 aufgenommen. Die Kartusche 15 enthält eine fließfähige, beispielsweise pastöse Masse, die sich durch Verschieben des Kolbens 1 auspressen lässt. Die Kartusche 15 kann mehrere, beispielsweise zwei Komponenten enthalten, die getrennt voneinander in Folienbeuteln in der Kartusche 15 enthalten sind. Die als solches nicht dargestellten Folienbeutel liegen an einer Innenseite einer Wand der Kartusche 15 an und sind beispielsweise linienförmig mit einer in Längsrichtung der Kartusche 15 verlaufenden Klebe- oder Kunststoffschweißnaht 16 an der Innenseite der Kartusche 15 fixiert. Beim Auspressen der Masse löst die Scherkante 4 des Kolbens 1 die Folienbeutel von der Innenseite der Kartusche 15. Tritt beispielsweise durch eine Beschädigung eine Komponente der Masse aus dem Folienbeutel aus und wird von der Scherkante 4 "überfahren", verhindert die Dichtlippe 5, dass die Masse am Kolben 1 vorbei aus der Kartusche 15 austritt. Zudem verhindert die Dichtlippe 5 das Eintreten von Luft in die Kartusche verbunden mit einem Eintrag von Luftfeuchtigkeit. Die aus dem Folienbeutel ausgetretene Masse wird von der Dichtlippe 5 nach innen gelenkt und tritt durch die Schlitze 10 des Kragens 9 in einen Zwischenraum zwischen den Grundflächen 8 der beiden Kolbenteile 2, 3 ein. Der Zwischenraum zwischen den Grundflächen 8 bildet ein Reservoir 17 für die aus dem Folienbeutel ausgetretene und von der Scherkante 4 "überfahrene" Masse, die Schlitze 10 des Kragens 9 bilden Eintrittsöffnungen für das Reservoir 17. Die Dichtlippe 5 dichtet aufgrund ihrer Elastizität auch im Bereich von Unebenheiten auf der Innenseite der Kartusche 15, also beispielsweise im Bereich der Klebe- oder Kunststoffschweißnaht 16, ab.As in FIGS. 3 and 4 can be seen, the piston 1, which comprises the two piston parts 2, 3, which are connected to each other with the snap connection 13, received in a cartridge 15. The cartridge 15 contains a flowable, for example, pasty mass, which can be pressed out by moving the piston 1. The cartridge 15 may include a plurality of, for example, two components, which are contained separately in foil bags in the cartridge 15. The film bags, not shown as such, abut against an inner side of a wall of the cartridge 15 and are fixed to the inside of the cartridge 15, for example in a line with a glued or plastic weld seam 16 running in the longitudinal direction of the cartridge 15. When the mass is pressed out, the shearing edge 4 of the piston 1 releases the foil bags from the inside of the cartridge 15. If, for example, a component of the mass emerges from the foil bag as a result of damage and is "run over" by the shearing edge 4, the sealing lip 5 prevents that Mass past the piston 1 from the cartridge 15 exits. In addition, the sealing lip 5 prevents the entry of air into the cartridge connected to an entry of humidity. The mass leaked out of the foil bag is directed inwards by the sealing lip 5 and enters through the slits 10 of the collar 9 into an intermediate space between the base surfaces 8 of the two piston parts 2, 3. The space between the base surfaces 8 forms a reservoir 17 for the leaked from the foil pouch and the shearing edge 4 "overrun" mass, the slots 10 of the collar 9 form inlet openings for the reservoir 17. The sealing lip 5 seals due to their elasticity in the range of Unevenness on the inside of the cartridge 15, so for example in the field of adhesive or plastic weld 16, from.

Die beiden Kolbenteile 2, 3 weisen je eine Entlüftungsöffnung 18 auf. Diese hat im Ausführungsbeispiel die Form eines zylindrischen Lochs und ist achsparallel exzentrisch an einer Stelle angeordnet, an der eine radiale Rippe 21 auf eine rohrförmige Rippe 20 stößt. Die durch druckknopfartiges Einschnappen verbundenen Kolbenteile 2, 3 sind gegeneinander drehbar, so dass die Entlüftungsöffnungen 18 der beiden Kolbenteile 2, 3 deckungsgleich ausgerichtet sind und damit ineinander übergehen. In dieser Drehstellung der Kolbenteile 2, 3 kann der Kolben 1 in die Kartusche 15 eingebracht werden und Luft aus der Kartusche 15 durch die Entlüftungsöffnungen 18 entweichen. Durch Drehen der beiden Kolbenteile 2, 3 gegeneinander verschließt das eine Kolbenteil 2 die Entlüftungsöffnung 18 des anderen Kolbenteils 3, wie es in Figur 4 zu sehen ist. Zur zuverlässigen Abdichtung weisen die Kolbenteile 2, 3 kalottenförmige Verschlusszapfen 19 auf, die so angeordnet sind, dass durch Drehung der Kolbenteile 2, 3 gegeneinander der Verschlusszapfen 19 des einen Kolbenteils 2 in Deckung mit der Entlüftungsöffnung 18 des anderen Kolbenteils 3 gebracht werden kann, wie es in Figur 4 zu sehen ist. Die Verschlusszapfen 19 verbessern eine Abdichtung des Verschluss der Entlüftungsöffnung 18. Ist die Entlüftungsöffnung 18 durch die Drehung der beiden Kolbenteile 2, 3 gegeneinander verschlossen, kann beim Auspressen der Kartusche 15 keine fließfähige Masse durch die Entlüftungsöffnungen 18 im Kolben 1 austreten.The two piston parts 2, 3 each have a vent opening 18. This has the form of a cylindrical hole in the embodiment and is arranged eccentrically parallel to the axis at a point at which a radial rib 21 abuts a tubular rib 20. The piston parts 2, 3 connected by snap-fitting snap-fit are rotatable relative to one another, so that the ventilation openings 18 of the two piston parts 2, 3 aligned and thus merge into each other. In this rotational position of the piston parts 2, 3, the piston 1 can be introduced into the cartridge 15 and escape air from the cartridge 15 through the vent openings 18. By turning the two piston parts 2, 3 against each other, the one piston part 2 closes the vent opening 18 of the other piston part 3, as in FIG. 4 you can see. For reliable sealing, the piston parts 2, 3 calotte-shaped closure pins 19 which are arranged so that by rotation of the piston parts 2, 3 against each other, the closure pin 19 of the one piston part 2 can be brought into coincidence with the vent opening 18 of the other piston part 3, as it in FIG. 4 you can see. If the vent opening 18 is closed against each other by the rotation of the two piston parts 2, 3, no flowable mass can escape through the vent openings 18 in the piston 1 when the cartridge 15 is pressed out.

BezugszeichenlisteLIST OF REFERENCE NUMBERS Kolben für eine Kartusche und KartuschePiston for a cartridge and cartridge

11
Kolbenpiston
2, 32, 3
Kolbenteilpiston part
44
Scherkanteshearing edge
55
Dichtlippesealing lip
66
Dichtkantesealing edge
77
Lippelip
88th
GrundflächeFloor space
99
Kragencollar
1010
Schlitzslot
1111
Segmentsegment
1212
Wulstbead
1313
Schnappverbindungsnap
1414
Aufnahmeadmission
1515
Kartuschecartridge
1616
Klebe- oder KunststoffschweißnahtAdhesive or plastic weld
1717
Reservoirreservoir
1818
Entlüftungsöffnungvent
1919
VerschlusszapfenVerschlusszapfen
20, 2120, 21
Ripperib

Claims (9)

Kolben zum Auspressen einer fließfähigen Masse aus einer Kartusche (15), wobei die Masse in einem Folienbeutel enthalten ist, dadurch gekennzeichnet, dass der Kolben (1) eine umlaufende Scherkante (4) zum Ablösen des Folienbeutels von einer Innenseite der Kartusche (15) und eine umlaufende Dichtung (5) zum Abdichten des Kolbens (1) in der Kartusche (15), aufweist, die miteinander verbunden sind.Piston for expressing a flowable mass from a cartridge (15), wherein the mass is contained in a foil bag, characterized in that the piston (1) has a peripheral shear edge (4) for detaching the foil bag from an inside of the cartridge (15) and a circumferential seal (5) for sealing the piston (1) in the cartridge (15), which are connected together. Kolben nach Anspruch 1, dadurch gekennzeichnet, dass der Kolben (1) zwei in ihrer Form übereinstimmende Kolbenteile (2, 3) aufweist, deren eines Kolbenteil (2) die Scherkante (4) und deren anderes Kolbenteil (3) die Dichtung (5) aufweist, und dass die beiden Kolbenteile (2, 3) verbunden sind.Piston according to claim 1, characterized in that the piston (1) has two piston parts (2, 3) matching in their shape, one piston part (2) the shearing edge (4) and the other piston part (3) the seal (5) and that the two piston parts (2, 3) are connected. Kolben nach Anspruch 1, dadurch gekennzeichnet, dass der Kolben (1) eine umlaufende Dichtlippe als Dichtung (5) aufweist.Piston according to claim 1, characterized in that the piston (1) has a circumferential sealing lip as a seal (5). Kolben nach Anspruch 3, dadurch gekennzeichnet, dass die Scherkante (4) in ihrer Form mit der Dichtlippe (5) übereinstimmt.Piston according to claim 3, characterized in that the shear edge (4) coincides in shape with the sealing lip (5). Kolben nach Anspruch 1, dadurch gekennzeichnet, dass der Kolben (1) eine Schnapp- oder Rastverbindung (13) aufweist, die die Scherkante (4) und die Dichtung (5) verbindet.Piston according to claim 1, characterized in that the piston (1) has a snap or latching connection (13) which connects the shearing edge (4) and the seal (5). Kolben nach Anspruch 1, dadurch gekennzeichnet, dass die Scherkante (4) in Auspressrichtung vor der Dichtung (5) angeordnet ist und dass der Kolben (1) ein Reservoir (17) für die Masse mit einer Eintrittsöffnung (10) zwischen der Scherkante (4) und der Dichtung (5) aufweist.Piston according to claim 1, characterized in that the shearing edge (4) is arranged in the extrusion direction in front of the seal (5) and that the piston (1) has a reservoir (17) for the mass with an inlet opening (10) between the shearing edge (4 ) and the seal (5). Kolben nach Anspruch 1, dadurch gekennzeichnet, dass der Kolben (1) eine verschließbare Entlüftungsöffnung (18) aufweist.Piston according to claim 1, characterized in that the piston (1) has a closable vent opening (18). Kolben nach Anspruch 2, dadurch gekennzeichnet, dass die beiden Kolbenteile (2, 3) gegeneinander drehbar sind und dass die Kolbenteile (2, 3) Entlüftungsöffnungen (18) aufweisen, die in einer Drehstellung der Kolbenteile (2, 3) miteinander kommunizieren und dass in einer anderen Drehstellung das eine Kolbenteil (2) die Entlüftungsöffnung (18) des anderen Kolbenteils (3) verschließt.Piston according to claim 2, characterized in that the two piston parts (2, 3) are rotatable relative to one another and that the piston parts (2, 3) have ventilation openings (18) which communicate with each other in a rotational position of the piston parts (2, 3) and in another rotational position the one piston part (2) closes the vent opening (18) of the other piston part (3). Kartusche mit einem in der Kartusche (15) angeordneten Folienbeutel, der eine fließfähige Masse enthält, und mit einem Kolben (1) zum Auspressen der Masse aus der Kartusche (15), dadurch gekennzeichnet, dass der Kolben (1) eine umlaufende Scherkante (4) zum Ablösen des Folienbeutels von einer Innenseite der Kartusche (15) und eine umlaufende Dichtung (5) zum Abdichten des Kolbens (1) in der Kartusche (15) aufweist, die miteinander verbunden sind.Cartridge with a foil bag arranged in the cartridge (15) and containing a flowable mass, and with a piston (1) for extruding the mass from the cartridge (15), characterized in that the piston (1) has a peripheral shearing edge (4 ) for detaching the film bag from an inside of the cartridge (15) and a peripheral seal (5) for sealing the piston (1) in the cartridge (15), which are connected together.
EP09005287A 2008-05-09 2009-04-11 Piston for a cartridge and cartridge Withdrawn EP2116484A1 (en)

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DE102008022999A DE102008022999A1 (en) 2008-05-09 2008-05-09 Piston for a cartridge and cartridge

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EP3189901A1 (en) * 2016-01-11 2017-07-12 HILTI Aktiengesellschaft Injector for filling an annular area around an anchor bolt
WO2017121706A1 (en) * 2016-01-11 2017-07-20 Hilti Aktiengesellschaft Injector for filling an annular space around an anchor bolt
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WO2019121207A1 (en) * 2017-12-19 2019-06-27 Wolfcraft Gmbh Piston assembly for a cartridge discharging device
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US11148168B2 (en) 2017-12-19 2021-10-19 Wolfcraft Gmbh Piston assembly for a cartridge discharging device
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US11541416B2 (en) 2018-10-02 2023-01-03 Medmix Switzerland Ag Reusable cartridge piston
US11938506B2 (en) 2019-03-26 2024-03-26 Medmix Switzerland Ag Piston, cartridge, dispenser
WO2021254647A1 (en) * 2020-06-16 2021-12-23 Marc Rischewski Discharging device for a portioning arrangement

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DE102008022999A1 (en) 2009-11-12
CN101575040A (en) 2009-11-11

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