EP2108599B1 - Cartridge piston - Google Patents

Cartridge piston Download PDF

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Publication number
EP2108599B1
EP2108599B1 EP09157743A EP09157743A EP2108599B1 EP 2108599 B1 EP2108599 B1 EP 2108599B1 EP 09157743 A EP09157743 A EP 09157743A EP 09157743 A EP09157743 A EP 09157743A EP 2108599 B1 EP2108599 B1 EP 2108599B1
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EP
European Patent Office
Prior art keywords
piston
cartridge
protective edge
side wall
sealing lip
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EP09157743A
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German (de)
French (fr)
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EP2108599A1 (en
Inventor
Achim Helmenstein
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.)
Fischbach KG Kunststoff Technik
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Fischbach KG Kunststoff Technik
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Priority to PL09157743T priority Critical patent/PL2108599T3/en
Publication of EP2108599A1 publication Critical patent/EP2108599A1/en
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    • 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
    • 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 invention relates to a one-piece cartridge piston for extruding mass from a cartridge, with a front piston breast, a circumferential side wall and at least one provided on the side wall, projecting forward flexible sealing lip.
  • Cartridges for auspressbare masses consist of a tubular cartridge body, in which the mass is filled.
  • the cartridge body is closed at the front end and the filling of the mass takes place from the open rear end.
  • the cartridge piston is also inserted from the rear end into the cartridge body to seal it.
  • the air trapped between the cartridge piston and the mass contained in the cartridge must be able to escape. If the air remained in the cartridge, the risk of hardening of the mass would exist.
  • the mass When filling a cartridge with a measured amount of the extrudable mass, the mass forms an end surface with a central dome surrounded by an annular trench.
  • the piston breast When setting the cartridge piston, the piston breast first hits against the middle dome. As a result, its mass is forced outwards and enters the tip region of the sealing lips. If the air can not escape backwards enough along the piston, air bubbles will be created. This is particularly due to the relatively long and narrow flow path of the air along the side wall of the piston. Another difficulty is that the side obliquely protruding sealing lips can be damaged when setting the piston, whereby their sealing function suffers when pressing the mass.
  • the invention has for its object to provide a cartridge piston with improved venting behavior when setting the piston and low susceptibility to piston handling.
  • the cartridge piston according to the invention is characterized by the patent claim 1. It is characterized by the fact that the protective edge has a greater rigidity than the sealing lips. It is relatively rigid and serves as a protective screen, which covers and shields a portion of the sealing lip when inserting the piston into the cartridge. This avoids that when inserting the piston into the cartridge, one of the sealing lips on the rear edge of the cartridge kinks over and is damaged.
  • the protective edge which is rigid relative to the sealing lips, protects the sealing lips from damage by mutual impacting in the transport carton of the pistons and also on the piston conveying sections, eg, in the direction of travel. As in the production of pistons and on the filling machines for filling the cartridge packaging.
  • the sealing lips must have a high degree of flexibility in order to be able to tightly conform to the cartridge wall in a sealing manner even at low pressures.
  • the sealing lips are designed so flexible by having at least in some areas a small wall thickness, but at the same time have the greatest possible length.
  • the sealing lips are at least three times, better five times, more preferably at least eight times longer than the thinnest point of the sealing lip is thick.
  • a sealing lip which is protected by a protective edge is provided. The intended for this sealing lip protective edge is then executed in any case more rigid than the associated sealing lip and then covered with its axial shadow at least a portion of the sealing lip.
  • the protective edge covers at least 50%, better more than 70%, even better more than 90% of the radial height of a sealing lip.
  • a front protective edge and / or a rear protective edge on the piston is provided.
  • a front protective edge is at the front end of the side wall, laterally projecting from this, mainly transverse to Axial direction of the piston arranged.
  • a rear protective edge is arranged at the rear end of the side wall in a mainly axis-parallel orientation to the piston axis.
  • the front protective edge also causes a rejection of the auspressbaren mass when inserting the piston into the cartridge, wherein the mass initially pushed outward and then penetrates after deflection around the front protective edge in the annular gap between the side wall and the sealing lip.
  • This deflection causes an extension of the path of the mass along the end wall of the piston, so that the air has sufficient time to escape on the side wall of the piston to its rear end.
  • the front protective edge effectively forms a projection on which the mass can be distributed during advancement of the piston without air bubbles being trapped in the mass in front of the piston.
  • the front guard edge preferably has no contact with the cartridge wall (its diameter is thus smaller than the cartridge inner diameter).
  • the rear guard edge is preferably in contact with the cartridge wall (its diameter is thus larger than the cartridge inner diameter).
  • the respective protective edge is always in front of the sensitive end of the sealing lip.
  • the protective edge is located at the front end of the side wall.
  • the protective edge is located at the rear end of the side wall.
  • the protective edge may have various embodiments. It can be closed circumferentially or interrupted. It may even be so far interrupted that only segments of a protective edge are present. In extreme embodiments, the protective edge even consists only of at least three ribs, which also also form an axial covering shadow over the sealing lip for the protective function.
  • a front protective edge acts against the product, which is the squeezable mass, and protects the sealing lip from the product.
  • a rear protective edge is useful when the extrusion of the mass from the cartridge is effected by means of compressed air. The rear protection edge then protects the sealing lip against the compressed air acting from behind.
  • the protective edges also have a supporting effect, by supporting the piston on the cartridge wall and guide to avoid tilting.
  • the front protective edge is made relatively rigid and inflexible so that it protects the sealing lip mainly when inserting the piston into the cartridge.
  • the rear protective edge can be designed to be more flexible than the front protective edge, since it is intended to protect the sealing lip mainly in the transport carton and on the piston conveyor line during production of the pistons or during cartridge filling. This load is not as critical as the load when inserting the piston into the cartridge.
  • the front guard also serves as additional centering of the piston to the cartridge. The more distant sealing lip has in contact with the edge of the cartridge to this only a small offset. The risk of damage to the sensitive flexible sealing lip is thereby minimized.
  • the front guard edge has an outer diameter which is slightly smaller than the inner diameter of the cartridge.
  • the diameter difference is about 1 mm, so that an annular gap with a width of about 0.5 mm around the front guard edge remains around.
  • This annular gap allows the escape of air from the product space of the cartridge.
  • the rear protective edge has an outer diameter which is at least equal to the inner diameter of the cartridge. The rear protective edge therefore strokes circumferentially touching the cartridge wall along. It has passages for the escape of air when putting the piston in the cartridge.
  • the invention is particularly applicable to cartridge piston with rigid piston breast.
  • cartridge pistons which have a so-called "membrane bottom".
  • the membrane bottom swings outward so that a piston breast bulges out to the front.
  • the release pressure on the cartridge piston decreases, the diaphragm bottom elastically returns to its original shape. As a result, the product is sucked back into the cartridge, so that dripping is prevented.
  • the piston 10 has a front piston breast 11 and a circumferential side wall 12.
  • the piston breast 11 forms the front end wall of the piston.
  • the side wall 12 is externally provided with rings 13 which may be formed like a sawtooth. The rings prevent extensive contact of the side wall 12 on the inner wall of the cartridge.
  • the interior of the piston 10 is hollow. From the piston breast 11, ribs 14 extend in the rearward direction. The rearward ends of the ribs 14 are approximately in a plane against which the plate of a (not shown) Auspresswerkmaschineschwes, which advances the piston in the cartridge body.
  • the front or inner sealing lip 20 is designed arcuate or cup-shaped, so that its diameter is larger towards the front end.
  • the outer sealing lip 21, which surrounds the sealing lip 20 at a radial distance, essentially represents an extension of the outer contour of the side wall 12. Its front end is slightly bent outward.
  • the two sealing lips 20 and 21 surround the constricted region 16.
  • the sealing lip 20 has circumferentially distributed openings 22 in the form of slots, which are arranged in the root area, ie near the shoulder 17.
  • the outer sealing lip 21 has openings 23 at its front edge.
  • the openings 22 of the sealing lip 20 and the openings 23 of the sealing lip 21 are arranged to each other in gap, d. H. they are not on a common radius.
  • a front protective edge 30 is new, which is provided in the transition between the region 16 and the piston breast 11 and forms an annular roof, which covers the sealing lip 20 at least partially when viewed in the axial direction of the piston.
  • the protective edge 30 casts an axial shadow, which radially covers a portion of the sealing lip 20, and possibly the sealing lip 21.
  • the entire cartridge piston is made in one piece from a plastic.
  • the sealing lips 20, 21 are so thin-walled that they have the flexibility required to stroke along the cartridge wall with radial pressure.
  • the protective edge 30, however, has a greater wall thickness, so that it is relatively rigid and it extends substantially radially outward.
  • the outer ends of the two sealing lips 20, 21 project approximately equidistant.
  • the protective edge 30 is back by a small amount.
  • the protective edge covers more than 20% of the radial height R 1 of a sealing lip, better more than 35%, more preferably more than 50% of the radial height R 1 of the sealing lip.
  • the piston breast 11 merges into the protective edge 30 in a continuous arc.
  • the protective edge 30 has, inter alia, the function of a deflector which, when setting the piston, directs the mass contained in the cartridge to the outside, while the central dome is deformed by the piston breast.
  • the airway from the piston breast remains open through the apertures 22 and 23 so that the air can escape on a meandering path to subsequently flow outwardly on the sidewall 12 to the rear.
  • the reduced diameter of the protective rim 30 is intended to facilitate the insertion of the piston into a cartridge and to pre-center the piston. Another reason is to let the air flow past the guard edge to the rear.
  • FIGS. 4 and 5 corresponds largely to the first embodiment, to which reference is made.
  • a rearwardly facing sealing lip 32 is provided on the side wall 12.
  • the piston is also suitable for a pneumatic extrusion tool, wherein the rear sealing lip 32 rests against the cartridge wall and seals the pressure chamber.
  • a rear protective edge 33 is formed on the side wall 12. This protective edge 33 is annular. It is also rigid and covers in axial projection a portion of the associated sealing lip 32. The two protective edges 30 and 33 cause the piston in the front and in the rear area along the cartridge wall is guided stable.
  • longitudinal grooves 36 are provided, which openings 38 open in the root region of the protective edge 33.
  • the purpose of the apertures 38 is to ensure a venting of the cartridge during the piston setting also for the case when the protective edge 33 bears tightly against the cartridge inner wall. Furthermore, compressed air can flow from a pneumatic extrusion tool through these openings and press the sealing lip behind it sealingly against the cartridge wall.
  • FIGS. 6 and 7 two front, forward facing sealing lips 20, 21 are provided, and two rear, rearwardly facing sealing lips 32, 34.
  • the front sealing lips 20, 21 are partially covered in axial projection from the front radial protection edge 30 and the rear sealing lips 32, 34th are partially covered by the rear axial protective edge 33 in axial projection.
  • the rear protective edge 33 has on the outside axial passages 37, which form air ducts through which the outside of the piston, which passes along the piston during piston setting, can escape to the rear.
  • FIG. 7 shows in the third embodiment, the relations between the cartridge piston and the inner surface of the cartridge.
  • the free ends of the sealing lips 20, 21 and 32, 34 are pressed inwardly by the cartridge wall.
  • the rear protective edge 33 strips along the inner surface 39 of the cartridge, while the front protective edge 30 maintains a distance a from the inner surface 39.
  • FIG. 8 shows the same piston structure as in the first embodiments, but with a diaphragm bottom 40 in the piston breast 11.
  • the diaphragm bottom 40 consists of a flexible annular bellows 41, the two film hinges 42, 43 and is shown in the drawing in the relaxed, folded state.
  • the piston of FIG. 8 has flexible sealing lips 20, 21 and in front of these a front protective edge 30.
  • FIG. 9 shows a longitudinal section through a cartridge 50 in combination with a cartridge piston 10.
  • the cartridge 50 has an elongated cylindrical cartridge body 51 which is closed at one end by an end wall 52.
  • an outlet pipe 53 with a thread for screwing on a nozzle.
  • the outlet port 53 is closed. It can be opened by severing its outer end.
  • the cartridge 50 includes an expulsible mass 55 that is filled through the rear opening 56 before the piston 10 is set.
  • the mass 55 forms a central dome 57 after filling, which is surrounded by an annular trench 58.
  • the front protective edge 30 prevents the premature closure of the piston edge for the escaping air.
  • the protective edge 30 acts a pre-centering of the piston when inserted into the cartridge 50 and a protection of the sealing lip 20 during storage and handling of the piston and during insertion of the piston in the cartridge.

Abstract

The piston has front and rear flexible sealing lips (20, 21) staying frontwardly, and provided at a side wall (12). The side wall comprises a circular or disconnected front protective edge (30) and a rear protective edge (33) before the sealing lips. The front protective edge covers a portion or the sealing lip in an axial projection, and is arranged at a piston shoulder (11). The front edge is protruded by the piston shoulder, and the rear protective edge is arranged at a rear end of the side wall. The rear edge is extended opposite to the side wall at a dimension. An independent claim is also included for a combination of a cartridge and a cartridge piston.

Description

Die Erfindung betrifft einen einstückigen Kartuschenkolben zum Auspressen von Masse aus einer Kartusche, mit einer vorderen Kolbenbrust, einer umlaufenden Seitenwand und mindestens einer an der Seitenwand vorgesehenen, nach vorne abstehenden flexiblen Dichtlippe.The invention relates to a one-piece cartridge piston for extruding mass from a cartridge, with a front piston breast, a circumferential side wall and at least one provided on the side wall, projecting forward flexible sealing lip.

Kartuschen für auspressbare Massen, wie beispielsweise Dicht- oder Füllmassen, bestehen aus einem rohrförmigen Kartuschenkörper, in den die Masse eingefüllt wird. Der Kartuschenkörper ist am vorderen Ende geschlossen und das Befüllen der Masse erfolgt vom offenen rückwärtigen Ende her. Anschließend wird der Kartuschenkolben ebenfalls vom rückwärtigen Ende her in den Kartuschenkörper eingeführt, um diesen abzudichten. Bei diesem Setzen des Kartuschenkolbens muss die zwischen Kartuschenkolben und der in der Kartusche befindlichen Masse eingeschlossene Luft entweichen können. Würde die Luft in der Kartusche verbleiben, würde die Gefahr des Aushärtens der Masse bestehen.Cartridges for auspressbare masses, such as sealants or fillers, consist of a tubular cartridge body, in which the mass is filled. The cartridge body is closed at the front end and the filling of the mass takes place from the open rear end. Subsequently, the cartridge piston is also inserted from the rear end into the cartridge body to seal it. In this setting the cartridge piston the air trapped between the cartridge piston and the mass contained in the cartridge must be able to escape. If the air remained in the cartridge, the risk of hardening of the mass would exist.

In DE 10 2006 025 873 A1 (Fischbach ) ist ein einstückiger Kartuschenkolben beschrieben, der an seiner Seitenwand mindestens zwei schräg nach außen abstehende Dichtlippen hintereinander aufweist. Die vordere Dichtlippe hat erste Durchbrüche und die hintere Dichtlippe hat zweite Durchbrüche. Dadurch entsteht ein mäanderförmiger, relativ langer enger Pfad aus dem Kartuscheninnern nach außen. Dieser Pfad ermöglicht das Entweichen der Luft beim Setzen des Kartuschenkolbens, bietet jedoch einen hohen Fließwiderstand für die pastöse Masse. Die Masse kann daher nicht bis zur Kartuschenwand nach außen vordringen und sie kann nicht zwischen der Seitenwand des Kolbens und der Wand des Kartuschenkörpers während des Auspressens der Kartusche vorbeiströmen. In Folge des langen und engen mäanderförmigen Fließweges von Innen nach außen wird die Dichtigkeit auch bei hohem Innendruck verbessert, ohne die Entlüftungsfähigkeit zu verringern und ohne die Gleitfähigkeit des Kolbens zu beeinträchtigen.In DE 10 2006 025 873 A1 (Fischbach ) is a one-piece cartridge piston described, which has on its side wall at least two obliquely outwardly projecting sealing lips in a row. The front sealing lip has first openings and the rear sealing lip has second openings. This creates a meandering, relatively long narrow path from the inside of the cartridge to the outside. This path allows the escape of air when setting the cartridge piston, but provides a high flow resistance for the pasty mass. The mass therefore can not penetrate to the cartridge wall to the outside and it can not flow past between the side wall of the piston and the wall of the cartridge body during the extrusion of the cartridge. Due to the long and narrow meander-shaped flow path from inside to outside, the tightness is improved even at high internal pressure, without reducing the venting ability and without affecting the lubricity of the piston.

In DE 30 05 855 A1 (Fischbach ) ist ein Kartuschenkolben beschrieben, der an seiner Umfangswand eine schräg nach hinten abstehende Dichtlippe aufweist. Am Übergang zwischen der Umfangswand und der Kolbenbrust befindet sich eine umlaufende Abstreiflippe, die während des Auspressvorgangs verspreizt wird und dann abstreifend an der Kartuschenwand entlangstreicht.In DE 30 05 855 A1 (Fischbach ) a cartridge piston is described, which has on its peripheral wall an obliquely projecting rearward sealing lip. At the transition between the peripheral wall and the piston breast is a circumferential wiper lip, which is spread during the Auspressvorgangs and then rubbing stripping along the cartridge wall.

In DE 31 48 490 (Fischbach ) ist ein mehrteiliger Kartuschenkolben beschrieben, bei dem die Kolbenbrust von einem Deckelelement bedeckt wird. Das Deckelelement, das seitlich übersteht, übernimmt eine Abstreif- und Dichtwirkung beim Vorschub des Kolbens. An der Umfangswand des Kolbens befindet sich eine schräg nach hinten abstehende Dichtlippe.In DE 31 48 490 (Fischbach ) a multipart cartridge piston is described in which the piston breast is covered by a cover element. The cover element, which protrudes laterally, assumes a stripping and sealing effect during the advancement of the piston. On the peripheral wall of the piston is an obliquely projecting rear sealing lip.

Schließlich ist aus DE 85 02 083.4 U1 (Bramlage ) ein Kartuschenkolben bekannt, der eine zylindrische Umfangswand und eine geschlossene Bodenwand aufweist. Das vordere offene Ende ist von einem deckelartig aufgesetzten Druckboden bedeckt, der eine Öffnung aufweist. Nach dem Befüllen der Kartusche dringt pastöse Masse durch die Öffnung hindurch in den Kolben ein, um sich wulstartig hinter den Öffnungsrand zu legen. Dadurch soll eine feste Verbindung mit einem in den Kolben eingesetzten Stift (Deostift oder Lippenstift) erreicht werden.Finally is off DE 85 02 083.4 U1 (Bramlage ) discloses a cartridge piston having a cylindrical peripheral wall and a closed bottom wall. The front open end is covered by a cover-like patch pressure floor, which has an opening. After filling the cartridge pasty mass penetrates through the opening into the piston to lie bead like behind the opening edge. This is a firm connection with a pin inserted into the piston (Deostift or lipstick) can be achieved.

In DE 20 2005 000 531 U1 ist ein Kartuschenkolben beschrieben, der zwei umlaufende Dichtlippen in Form von elastischen Lamellen aufweist. Die Kolbenbrust ist nach vorne eingezogen. Hinter den Dichtlippen befinden sich umlaufende Führungsrippen, die sägezahnförmig gestattet sind.In DE 20 2005 000 531 U1 a cartridge piston is described which has two circumferential sealing lips in the form of elastic lamellae. The piston breast is pulled forward. Behind the sealing lips are circumferential guide ribs, which are allowed sawtooth.

In DE 10 2006 025 873 A1 ist ein Kartuschenkolben beschrieben, der alle Merkmale des Oberbegriffs des Anspruchs 1 offenbart.In DE 10 2006 025 873 A1 a cartridge piston is described, which discloses all features of the preamble of claim 1.

Beim Befüllen einer Kartusche mit einer bemessenen Menge der auspressbaren Masse bildet die Masse eine Endfläche mit einem Mitteldom, der von einem ringförmigen Graben umgeben ist. Beim Setzen des Kartuschenkolbens stößt die Kolbenbrust zunächst gegen den Mitteldom. Dadurch wird dessen Masse nach außen gedrängt und gelangt in den Spitzenbereich der Dichtlippen. Wenn die Luft nicht schnell genug am Kolben entlang nach hinten entweichen kann, entstehen Lufteinschlüsse. Dies liegt insbesondere an dem relativ langen und engen Strömungsweg der Luft entlang der Seitenwand des Kolbens. Eine weitere Schwierigkeit besteht darin, dass die seitlich schräg abstehenden Dichtlippen beim Setzen des Kolbens beschädigt werden können, wodurch ihre Dichtfunktion beim Auspressen der Masse leidet.When filling a cartridge with a measured amount of the extrudable mass, the mass forms an end surface with a central dome surrounded by an annular trench. When setting the cartridge piston, the piston breast first hits against the middle dome. As a result, its mass is forced outwards and enters the tip region of the sealing lips. If the air can not escape backwards enough along the piston, air bubbles will be created. This is particularly due to the relatively long and narrow flow path of the air along the side wall of the piston. Another difficulty is that the side obliquely protruding sealing lips can be damaged when setting the piston, whereby their sealing function suffers when pressing the mass.

Der Erfindung liegt die Aufgabe zugrunde, einen Kartuschenkolben mit verbessertem Entlüftungsverhalten beim Kolbensetzen und geringer Störanfälligkeit bei der Kolbenhandhabung zu schaffen.The invention has for its object to provide a cartridge piston with improved venting behavior when setting the piston and low susceptibility to piston handling.

Der erfindungsgemäße Kartuschenkolben ist durch den Patentanspruch 1 charakterisiert. Er zeichnet sich dadurch aus, dass der Schutzrand eine größere Steifigkeit als die Dichtlippenhat. Er ist relativ starr und dient als Schutzschirm, der beim Einschieben des Kolbens in die Kartusche einen Teilbereich der Dichtlippe überdeckt und abschirmt. Dadurch wird vermieden, dass beim Einschieben des Kolbens in die Kartusche eine der Dichtlippen an der hinteren Kartuschenkante umknickt und beschädigt wird. Außerdem schützt der relativ zu den Dichtlippen starre Schutzrand die Dichtlippen vor Beschädigungen durch gegenseitiges Bestoßen in dem Transportkarton der Kolben und auch auf den Kolbenförderstrecken, z. B. bei der Kolbenherstellung und auch auf den Abfüllmaschinen zur Befüllung der Kartuschenverpackungen.The cartridge piston according to the invention is characterized by the patent claim 1. It is characterized by the fact that the protective edge has a greater rigidity than the sealing lips. It is relatively rigid and serves as a protective screen, which covers and shields a portion of the sealing lip when inserting the piston into the cartridge. This avoids that when inserting the piston into the cartridge, one of the sealing lips on the rear edge of the cartridge kinks over and is damaged. In addition, the protective edge, which is rigid relative to the sealing lips, protects the sealing lips from damage by mutual impacting in the transport carton of the pistons and also on the piston conveying sections, eg, in the direction of travel. As in the production of pistons and on the filling machines for filling the cartridge packaging.

Die Dichtlippen müssen eine hohe Flexibilität aufweisen, um sich auch bei geringen Drücken verformend an die Kartuschenwand abdichtend anschmiegen zu können. Dazu sind die Dichtlippen derart flexibel ausgeführt, indem sie wenigstens in Teilbereichen eine geringe Wanddicke aufweisen, gleichzeitig aber auch eine möglichst große Länge haben. Vorzugsweise sind die Dichtlippen mindestens dreimal, besser fünfmal, besonders vorzugsweise mindestens achtmal länger als die dünnste Stelle der Dichtlippe dick ist. Bei solch einer Ausführung ist eine durch einen Schutzrand schützenswerte Dichtlippe gegeben. Der für diese Dichtlippe vorgesehene Schutzrand ist dann in jedem Fall starrer ausgeführt als die zugehörige Dichtlippe und überdeckt dann auch mit seinem axialen Schatten mindestens einen Teilbereich der Dichtlippe.The sealing lips must have a high degree of flexibility in order to be able to tightly conform to the cartridge wall in a sealing manner even at low pressures. For this purpose, the sealing lips are designed so flexible by having at least in some areas a small wall thickness, but at the same time have the greatest possible length. Preferably, the sealing lips are at least three times, better five times, more preferably at least eight times longer than the thinnest point of the sealing lip is thick. In such an embodiment, a sealing lip which is protected by a protective edge is provided. The intended for this sealing lip protective edge is then executed in any case more rigid than the associated sealing lip and then covered with its axial shadow at least a portion of the sealing lip.

Vorzugsweise ist vorgesehen, dass im nicht eingesetzten Zustand des Kolbens in die Kartusche der Schutzrand mehr als 20 % der radialen Höhe einer Dichtlippe, besser mehr als 35 %, noch besser mehr als 50 % der radialen Höhe der Dichtlippe überdeckt.It is preferably provided that in the non-inserted state of the piston in the cartridge of the protective edge more than 20% of the radial height of a sealing lip, better more than 35%, more preferably covers more than 50% of the radial height of the sealing lip.

Im eingesetzten Zustand des Kolbens in die Kartusche überdeckt der Schutzrand wenigstens 50 %, besser mehr als 70 %, noch besser mehr als 90 % der radialen Höhe einer Dichtlippe.In the inserted state of the piston in the cartridge, the protective edge covers at least 50%, better more than 70%, even better more than 90% of the radial height of a sealing lip.

Es besteht die Möglichkeit, einen vorderen Schutzrand und/oder einen hinteren Schutzrand an dem Kolben vorzusehen. Ein vorderer Schutzrand ist am vorderen Ende der Seitenwand, seitlich von dieser abstehend, hauptsächlich quer zur Achsrichtung des Kolbens angeordnet. Ein hinterer Schutzrand ist am hinteren Ende der Seitenwand in hauptsächlich achsparalleler Orientierung zur Kolbenachse angeordnet. Der vordere Schutzrand bewirkt auch ein Abweisen der auspressbaren Masse beim Einsetzen des Kolbens in die Kartusche, wobei die Masse zunächst nach außen abgedrängt und anschließend nach Umlenkung um den vorderen Schutzrand in den Ringspalt zwischen Seitenwand und Dichtlippe vordringt. Diese Umlenkung verursacht eine Verlängerung des Weges der Masse entlang der Stirnwand des Kolbens, so dass die Luft hinreichend Zeit hat, um an der Seitenwand des Kolbens bis zu dessen hinterem Ende zu entweichen. Der vordere Schutzrand bildet gewissermaßen einen Überstand, auf dem sich die Masse beim Vorschieben des Kolbens verteilen kann, ohne dass Luftblasen in der Masse vor dem Kolben eingeschlossen werden.It is possible to provide a front protective edge and / or a rear protective edge on the piston. A front protective edge is at the front end of the side wall, laterally projecting from this, mainly transverse to Axial direction of the piston arranged. A rear protective edge is arranged at the rear end of the side wall in a mainly axis-parallel orientation to the piston axis. The front protective edge also causes a rejection of the auspressbaren mass when inserting the piston into the cartridge, wherein the mass initially pushed outward and then penetrates after deflection around the front protective edge in the annular gap between the side wall and the sealing lip. This deflection causes an extension of the path of the mass along the end wall of the piston, so that the air has sufficient time to escape on the side wall of the piston to its rear end. The front protective edge effectively forms a projection on which the mass can be distributed during advancement of the piston without air bubbles being trapped in the mass in front of the piston.

Der vordere Schutzrand hat vorzugsweise keinen Kontakt mit der Kartuschenwand (sein Durchmesser ist somit kleiner als der Kartuscheninnendurchmesser). Der hintere Schutzrand hat vorzugsweise Kontakt mit der Kartuschenwand (sein Durchmesser ist somit größer als der Kartuscheninnendurchmesser). Der jeweilige Schutzrand steht immer vor dem empfindlichen Ende der Dichtlippe. Für die vorderen Dichtlippen, welche nach vorne hin zum Produkt abdichten sollen, befindet sich der Schutzrand am vorderen Ende der Seitenwand. Bei den hinteren Dichtlippen, welche die Kartusche abdichtend nach außen verschließen sollen, befindet sich der Schutzrand am hinteren Ende der Seitenwand. Somit ist der Schutzrand für die hintere Dichtlippe am offenen Kolbenende.The front guard edge preferably has no contact with the cartridge wall (its diameter is thus smaller than the cartridge inner diameter). The rear guard edge is preferably in contact with the cartridge wall (its diameter is thus larger than the cartridge inner diameter). The respective protective edge is always in front of the sensitive end of the sealing lip. For the front sealing lips, which are to seal towards the front of the product, the protective edge is located at the front end of the side wall. In the rear sealing lips, which are to seal the cartridge sealingly outward, the protective edge is located at the rear end of the side wall. Thus, the protective edge for the rear sealing lip at the open end of the piston.

Der Schutzrand kann verschiedene Ausführungsformen besitzen. Er kann umlaufend geschlossen oder auch unterbrochen sein. Er kann sogar soweit unterbrochen sein, dass nur noch Segmente eines Schutzrandes vorhanden sind. Bei extremen Ausführungsformen besteht der Schutzrand sogar nur aus mindestens drei Rippen, welche ebenfalls noch zur Schutzfunktion einen axialen Deckungsschatten über die Dichtlippe bilden.The protective edge may have various embodiments. It can be closed circumferentially or interrupted. It may even be so far interrupted that only segments of a protective edge are present. In extreme embodiments, the protective edge even consists only of at least three ribs, which also also form an axial covering shadow over the sealing lip for the protective function.

Ein vorderer Schutzrand wirkt gegen das Produkt, bei dem es sich um die auspressbare Masse handelt, und schützt die Dichtlippe vor dem Produkt. Ein hinterer Schutzrand ist zweckmäßig, wenn das Auspressen der Masse aus der Kartusche mittels Druckluft erfolgt. Der hintere Schutzrand schützt dann die Dichtlippe gegenüber der von hinten einwirkenden Druckluft. Die Schutzränder haben auch eine stützende Wirkung, indem sie den Kolben an der Kartuschenwand abstützen und führen, um ein Verkanten zu vermeiden.A front protective edge acts against the product, which is the squeezable mass, and protects the sealing lip from the product. A rear protective edge is useful when the extrusion of the mass from the cartridge is effected by means of compressed air. The rear protection edge then protects the sealing lip against the compressed air acting from behind. The protective edges also have a supporting effect, by supporting the piston on the cartridge wall and guide to avoid tilting.

Der vordere Schutzrand ist relativ starr und unflexibel ausgeführt, damit er die Dichtlippe hauptsächlich beim Einschieben des Kolbens in die Kartusche schützt. Der hintere Schutzrand kann flexibler als der vordere Schutzrand ausgeführt sein, da dieser die Dichtlippe hauptsächlich in den Transportkarton und auf der Kolbenförderstrecke bei Herstellung der Kolben bzw. bei der Kartuschenabfüllung schützen soll. Diese Belastung ist nicht so kritisch wie die Belastung beim Einschieben des Kolbens in die Kartusche. Der vordere Schutzrand dient auch als zusätzliche Zentrierung des Kolbens zur Kartusche. Die weiter hinten liegende Dichtlippe weist bei Kontakt mit dem Kartuschenrand zu diesem einen nur geringen Versatz auf. Das Risiko von Beschädigungen der empfindlichen flexiblen Dichtlippe wird dadurch minimiert.The front protective edge is made relatively rigid and inflexible so that it protects the sealing lip mainly when inserting the piston into the cartridge. The rear protective edge can be designed to be more flexible than the front protective edge, since it is intended to protect the sealing lip mainly in the transport carton and on the piston conveyor line during production of the pistons or during cartridge filling. This load is not as critical as the load when inserting the piston into the cartridge. The front guard also serves as additional centering of the piston to the cartridge. The more distant sealing lip has in contact with the edge of the cartridge to this only a small offset. The risk of damage to the sensitive flexible sealing lip is thereby minimized.

Vorzugsweise hat der vordere Schutzrand einen Außendurchmesser, der etwas kleiner ist als der Innendurchmesser der Kartusche. Die Durchmesserdifferenz beträgt etwa 1 mm, so dass ein Ringspalt mit einer Weite von etwa 0,5 mm um den vorderen Schutzrand herum verbleibt. Dieser Ringspalt ermöglicht das Entweichen der Luft aus dem Produktraum der Kartusche. Der hintere Schutzrand hat einen Außendurchmesser, der mindestens gleich groß ist wie der Innendurchmesser der Kartusche. Der hintere Schutzrand streicht daher umfangsmäßig berührend an der Kartuschenwand entlang. Er weist Durchlässe für das Entweichen der Luft beim Kolbensetzen in die Kartusche auf.Preferably, the front guard edge has an outer diameter which is slightly smaller than the inner diameter of the cartridge. The diameter difference is about 1 mm, so that an annular gap with a width of about 0.5 mm around the front guard edge remains around. This annular gap allows the escape of air from the product space of the cartridge. The rear protective edge has an outer diameter which is at least equal to the inner diameter of the cartridge. The rear protective edge therefore strokes circumferentially touching the cartridge wall along. It has passages for the escape of air when putting the piston in the cartridge.

Die Erfindung ist insbesondere bei Kartuschenkolben mit starrer Kolbenbrust anwendbar. Sie eignet sich jedoch auch für Kartuschenkolben, die einen sogenannten "Membranboden" aufweisen. Beim Auspressen des Produkts aus der Kartusche stülpt sich der Membranboden nach außen, so dass sich eine Kolbenbrust nach vorne auswölbt. Beim Nachlassen des Auspressdruckes auf den Kartuschenkolben bildet sich der Membranboden elastisch wieder in seine Ursprungsform zurück. Dadurch wird das Produkt in die Kartusche zurückgesaugt, so dass ein Nachtropfen verhindert wird.The invention is particularly applicable to cartridge piston with rigid piston breast. However, it is also suitable for cartridge pistons, which have a so-called "membrane bottom". When the product is pressed out of the cartridge, the membrane bottom swings outward so that a piston breast bulges out to the front. When the release pressure on the cartridge piston decreases, the diaphragm bottom elastically returns to its original shape. As a result, the product is sucked back into the cartridge, so that dripping is prevented.

Im Folgenden werden unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert.In the following, embodiments of the invention will be explained in more detail with reference to the drawings.

Es zeigen:

Fig. 1
eine Seitenansicht einer ersten Ausführungsform des Kartuschenkolbens mit einem vorderen Schutzrand,
Fig. 2
eine perspektivische Rückansicht des Kolbens,
Fig. 3
einen Längsschnitt des Kolbens,
Fig. 4
eine perspektivische Rückansicht einer zweiten Ausführungsform der Erfindung mit einem vorderen Schutzrand und einem hinteren Schutzrand,
Fig. 5
einen Längsschnitt durch die zweite Ausführungsform,
Fig. 6
einen Längsschnitt durch eine dritte Ausführungsform mit zwei Schutzrändern und zwei vorderen und zwei hinteren Dichtlippen,
Fig. 7
eine Darstellung des Kolbens von Figur 6 im Zusammenwirken mit der Kartuschenwand,
Fig. 8
eine Ausführungsform der Erfindung mit Membranboden und
Fig. 9
eine mit Masse gefüllte Kartusche beim Setzen des Kolbens.
Show it:
Fig. 1
a side view of a first embodiment of the cartridge piston with a front protective edge,
Fig. 2
a perspective rear view of the piston,
Fig. 3
a longitudinal section of the piston,
Fig. 4
a rear perspective view of a second embodiment of the invention with a front protective edge and a rear protective edge,
Fig. 5
a longitudinal section through the second embodiment,
Fig. 6
a longitudinal section through a third embodiment with two protective edges and two front and two rear sealing lips,
Fig. 7
a representation of the piston of FIG. 6 in cooperation with the cartridge wall,
Fig. 8
an embodiment of the invention with membrane bottom and
Fig. 9
a mass-filled cartridge when setting the piston.

Bei dem Ausführungsbeispiel der Figuren 1 - 3 weist der Kolben 10 eine vordere Kolbenbrust 11 und eine umlaufende Seitenwand 12 auf. Die Kolbenbrust 11 bildet die vordere Stirnwand des Kolbens. Die Seitenwand 12 ist außen mit Ringen 13 versehen, die sägezahnförmig ausgebildet sein können. Die Ringe verhindern eine großflächige Anlage der Seitenwand 12 an der Innenwand der Kartusche. Das Innere des Kolbens 10 ist hohl. Von der Kolbenbrust 11 aus erstrecken sich Rippen 14 in rückwärtiger Richtung. Die rückwärtigen Enden der Rippen 14 liegen annähernd in einer Ebene, gegen die der Teller eines (nicht dargestellten) Auspresswerkzeugs drückt, das den Kolben in dem Kartuschenkörper vorschiebt.In the embodiment of the Figures 1 - 3 the piston 10 has a front piston breast 11 and a circumferential side wall 12. The piston breast 11 forms the front end wall of the piston. The side wall 12 is externally provided with rings 13 which may be formed like a sawtooth. The rings prevent extensive contact of the side wall 12 on the inner wall of the cartridge. The interior of the piston 10 is hollow. From the piston breast 11, ribs 14 extend in the rearward direction. The rearward ends of the ribs 14 are approximately in a plane against which the plate of a (not shown) Auspresswerkzeugs pushes, which advances the piston in the cartridge body.

Im Übergangsbereich zwischen der Kolbenbrust 11 und der Seitenwand 12 befindet sich ein Bereich 16 von geringerem Durchmesser als die Seitenwand 12, wodurch zwischen dem Bereich 16 und der Seitenwand 12 eine ringförmige Schulter 17 gebildet wird. Von dieser Schulter 17 stehen umlaufende Dichtlippen 20, 21 ab. Die vordere oder innere Dichtlippe 20 ist bogenförmig bzw. kelchförmig gestaltet, so dass ihr Durchmesser zum vorderen Ende hin größer wird. Die äußere Dichtlippe 21, die die Dichtlippe 20 mit radialem Abstand umgibt, stellt im wesentlichen eine Verlängerung der Außenkontur der Seitenwand 12 dar. Ihr vorderes Ende ist leicht nach außen abgebogen. Die beiden Dichtlippen 20 und 21 umgeben den eingeschnürten Bereich 16. Die Dichtlippe 20 hat umfangsmäßig verteilt angeordnete Durchbrechungen 22 in Form von Schlitzen, die im Wurzelbereich, also nahe der Schulter 17, angeordnet sind. Die äußere Dichtlippe 21 hat Durchbrechungen 23 an ihrem vorderen Rand.In the transition region between the piston breast 11 and the side wall 12 is a region 16 of smaller diameter than the side wall 12, whereby an annular shoulder 17 is formed between the region 16 and the side wall 12. From this shoulder 17 are circumferential sealing lips 20, 21 from. The front or inner sealing lip 20 is designed arcuate or cup-shaped, so that its diameter is larger towards the front end. The outer sealing lip 21, which surrounds the sealing lip 20 at a radial distance, essentially represents an extension of the outer contour of the side wall 12. Its front end is slightly bent outward. The two sealing lips 20 and 21 surround the constricted region 16. The sealing lip 20 has circumferentially distributed openings 22 in the form of slots, which are arranged in the root area, ie near the shoulder 17. The outer sealing lip 21 has openings 23 at its front edge.

Die Durchbrechungen 22 der Dichtlippe 20 und die Durchbrechungen 23 der Dichtlippe 21 sind zueinander auf Lücke angeordnet, d. h. sie liegen nicht auf einem gemeinsamen Radius.The openings 22 of the sealing lip 20 and the openings 23 of the sealing lip 21 are arranged to each other in gap, d. H. they are not on a common radius.

Der bisher beschriebene Kartuschenkolben entspricht demjenigen von DE 10 2006 025 873 A1 , deren Inhalt hiermit durch Verweisung in die vorliegende Beschreibung einbezogen wird. Neu ist demgegenüber ein vorderer Schutzrand 30, der im Übergang zwischen dem Bereich 16 und der Kolbenbrust 11 vorgesehen ist und ein ringförmiges Dach bildet, welches bei Betrachtung in axialer Richtung des Kolbens die Dichtlippe 20 mindestens teilweise verdeckt. Anders ausgedrückt: Der Schutzrand 30 wirft einen axialen Schatten, der einen Teilbereich der Dichtlippe 20, und ggf. der Dichtlippe 21, radial überdeckt. Der gesamte Kartuschenkolben ist einstückig aus einem Kunststoff hergestellt. Die Dichtlippen 20, 21 sind so dünnwandig, dass sie die erforderliche Flexibilität haben, um mit radialem Druck an der Kartuschenwand entlang zu streichen. Der Schutzrand 30 hat dagegen eine größere Wandstärke, so dass er relativ starr ist und er verläuft im wesentlichen radial nach außen. Die äußeren Enden der beiden Dichtlippen 20, 21 stehen etwa gleichweit vor. Dagegen steht der Schutzrand 30 um ein geringes Maß zurück.The cartridge piston described so far corresponds to that of DE 10 2006 025 873 A1 , the contents of which are hereby incorporated by reference into the present description. In contrast, a front protective edge 30 is new, which is provided in the transition between the region 16 and the piston breast 11 and forms an annular roof, which covers the sealing lip 20 at least partially when viewed in the axial direction of the piston. In other words, the protective edge 30 casts an axial shadow, which radially covers a portion of the sealing lip 20, and possibly the sealing lip 21. The entire cartridge piston is made in one piece from a plastic. The sealing lips 20, 21 are so thin-walled that they have the flexibility required to stroke along the cartridge wall with radial pressure. The protective edge 30, however, has a greater wall thickness, so that it is relatively rigid and it extends substantially radially outward. The outer ends of the two sealing lips 20, 21 project approximately equidistant. In contrast, the protective edge 30 is back by a small amount.

Im nicht eingesetzten Zustand des Kolbens in die Kartusche überdeckt der Schutzrand mehr als 20 % der radialen Höhe R1 einer Dichtlippe, besser mehr als 35 %, noch besser mehr als 50 % der radialen Höhe R1 der Dichtlippe.In the non-inserted state of the piston in the cartridge, the protective edge covers more than 20% of the radial height R 1 of a sealing lip, better more than 35%, more preferably more than 50% of the radial height R 1 of the sealing lip.

Die Kolbenbrust 11 geht in einem stetigen Bogen in den Schutzrand 30 über. Der Schutzrand 30 hat u. a. die Funktion eines Abweisers, der beim Setzen des Kolbens die in der Kartusche enthaltene Masse nach außen lenkt, während der Mitteldom von der Kolbenbrust verformt wird. In dieser Phase bleibt der Luftweg von der Kolbenbrust über die Durchbrechungen 22 und 23 offen, so dass die Luft auf einem mäanderförmigen Weg entweichen kann, um anschließend außen an der Seitenwand 12 nach hinten zu strömen. Beim Einführen des Kolbens in die Kartusche schützt der vordere Schutzrand die Dichtlippe gegen Beschädigungen durch die hintere Kante der Kartuschenwand. Ungewollte Verformungen der Dichtlippe werden dadurch ebenfalls vermieden.The piston breast 11 merges into the protective edge 30 in a continuous arc. The protective edge 30 has, inter alia, the function of a deflector which, when setting the piston, directs the mass contained in the cartridge to the outside, while the central dome is deformed by the piston breast. In this phase, the airway from the piston breast remains open through the apertures 22 and 23 so that the air can escape on a meandering path to subsequently flow outwardly on the sidewall 12 to the rear. When inserting the piston in the Cartridge protects the front protective edge, the sealing lip against damage by the rear edge of the cartridge wall. Unwanted deformations of the sealing lip are also avoided.

Des Weiteren soll der verringerte Durchmesser des Schutzrandes 30 das Einführen des Kolbens in eine Kartusche erleichtern und den Kolben vorzentrieren. Ein weiterer Grund besteht darin, die Luft an dem Schutzrand vorbei nach hinten strömen zu lassen.Furthermore, the reduced diameter of the protective rim 30 is intended to facilitate the insertion of the piston into a cartridge and to pre-center the piston. Another reason is to let the air flow past the guard edge to the rear.

Das Ausführungsbeispiel der Figuren 4 und 5 entspricht weitgehend dem ersten Ausführungsbeispiel, auf das verwiesen wird. Außer den nach vorne weisenden Dichtlippen 20, 21 ist an der Seitenwand 12 eine nach hinten weisende Dichtlippe 32 vorgesehen. Der Kolben ist auch für ein pneumatisches Auspresswerkzeug geeignet, wobei die hintere Dichtlippe 32 sich an die Kartuschenwand anlegt und den Druckraum abdichtet. Am rückwärtigen Ende des Kolbens ist ein hinterer Schutzrand 33 an der Seitenwand 12 gebildet. Dieser Schutzrand 33 ist ringförmig. Er ist ebenfalls starr und überdeckt in axialer Projektion einen Teilbereich der zugehörigen Dichtlippe 32. Die beiden Schutzränder 30 und 33 bewirken, dass der Kolben im vorderen und im hinteren Bereich entlang der Kartuschenwand stabil geführt wird.The embodiment of FIGS. 4 and 5 corresponds largely to the first embodiment, to which reference is made. In addition to the forward-facing sealing lips 20, 21, a rearwardly facing sealing lip 32 is provided on the side wall 12. The piston is also suitable for a pneumatic extrusion tool, wherein the rear sealing lip 32 rests against the cartridge wall and seals the pressure chamber. At the rear end of the piston, a rear protective edge 33 is formed on the side wall 12. This protective edge 33 is annular. It is also rigid and covers in axial projection a portion of the associated sealing lip 32. The two protective edges 30 and 33 cause the piston in the front and in the rear area along the cartridge wall is guided stable.

An der Innenseite der Seitenwand 12 sind längslaufende Nuten 36 vorgesehen, welche Durchbrüche 38 im Wurzelbereich des Schutzrandes 33 münden. Der Zweck der Durchbrüche 38 besteht darin, eine Entlüftung der Kartusche während des Kolbensetzens auch für den Fall zu gewährleisten, wenn der Schutzrand 33 umlaufend dicht an der Kartuscheninnenwand anliegt. Des Weiteren kann Druckluft aus einem pneumatischen Auspresswerkzeug durch diese Durchbrüche strömen und die dahinter liegende Dichtlippe dichtend an die Kartuschenwand andrücken.On the inside of the side wall 12 longitudinal grooves 36 are provided, which openings 38 open in the root region of the protective edge 33. The purpose of the apertures 38 is to ensure a venting of the cartridge during the piston setting also for the case when the protective edge 33 bears tightly against the cartridge inner wall. Furthermore, compressed air can flow from a pneumatic extrusion tool through these openings and press the sealing lip behind it sealingly against the cartridge wall.

Bei dem Ausführungsbeispiel der Figuren 6 und 7 sind zwei vordere, nach vorne weisende Dichtlippen 20, 21 vorgesehen, und zwei hintere, nach hinten weisende Dichtlippen 32, 34. Die vorderen Dichtlippen 20, 21 werden in axialer Projektion von dem vorderen radialen Schutzrand 30 teilweise überdeckt und die hinteren Dichtlippen 32, 34 werden von dem hinteren axialen Schutzrand 33 in axialer Projektion teilweise überdeckt. Der hintere Schutzrand 33 hat außen axiale Durchlässe 37, die Luftkanäle bilden, durch welche die beim Kolbensetzen außen an dem Kolben entlangstreichende Luft nach hinten entweichen kann.In the embodiment of the FIGS. 6 and 7 two front, forward facing sealing lips 20, 21 are provided, and two rear, rearwardly facing sealing lips 32, 34. The front sealing lips 20, 21 are partially covered in axial projection from the front radial protection edge 30 and the rear sealing lips 32, 34th are partially covered by the rear axial protective edge 33 in axial projection. The rear protective edge 33 has on the outside axial passages 37, which form air ducts through which the outside of the piston, which passes along the piston during piston setting, can escape to the rear.

Figur 7 zeigt bei dem dritten Ausführungsbeispiel die Relationen zwischen dem Kartuschenkolben und der Innenfläche der Kartusche. Die freien Enden der Dichtlippen 20, 21 und 32, 34 werden von der Kartuschenwand nach innen gedrückt. Der hintere Schutzrand 33 streift an der Innenfläche 39 der Kartusche entlang, während der vordere Schutzrand 30 einen Abstand a von der Innenfläche 39 einhält. FIG. 7 shows in the third embodiment, the relations between the cartridge piston and the inner surface of the cartridge. The free ends of the sealing lips 20, 21 and 32, 34 are pressed inwardly by the cartridge wall. The rear protective edge 33 strips along the inner surface 39 of the cartridge, while the front protective edge 30 maintains a distance a from the inner surface 39.

Figur 8 zeigt die gleiche Kolbenstruktur wie bei den ersten Ausführungsbeispielen, jedoch mit einem Membranboden 40 in der Kolbenbrust 11. Der Membranboden 40 besteht aus einem flexiblen Ringbalg 41, der zwei Filmgelenke 42, 43 aufweist und in der Zeichnung im entspannten, gefalteten Zustand dargestellt ist. Beim Auspressen von Masse wird Druckluft in den Kolben geleitet, so dass der Membranboden 40 sich nach vorne ausstülpt. Lässt der Luftdruck nach, so nimmt der Membranboden wieder die dargestellte Ursprungsstellung ein. Auch der Kolben von Figur 8 weist flexible Dichtlippen 20, 21 und vor diesen einen vorderen Schutzrand 30 auf. FIG. 8 shows the same piston structure as in the first embodiments, but with a diaphragm bottom 40 in the piston breast 11. The diaphragm bottom 40 consists of a flexible annular bellows 41, the two film hinges 42, 43 and is shown in the drawing in the relaxed, folded state. When extruding mass compressed air is passed into the piston, so that the diaphragm bottom 40 evades forward. If the air pressure decreases, the diaphragm bottom again assumes the initial position shown. Also the piston of FIG. 8 has flexible sealing lips 20, 21 and in front of these a front protective edge 30.

Figur 9 zeigt einen Längsschnitt durch eine Kartusche 50 in Kombination mit einem Kartuschenkolben 10. Die Kartusche 50 weist einen langgestreckten zylindrischen Kartuschenkörper 51 auf, der an einem Ende durch eine Stirnwand 52 verschlossen ist. In der Stirnwand 52 befindet sich ein Auslassstutzen 53 mit einem Gewinde zum Aufschrauben einer Düse. Der Auslassstutzen 53 ist geschlossen. Er kann durch Abtrennen seines äußeren Endes geöffnet werden. FIG. 9 shows a longitudinal section through a cartridge 50 in combination with a cartridge piston 10. The cartridge 50 has an elongated cylindrical cartridge body 51 which is closed at one end by an end wall 52. In the end wall 52 is an outlet pipe 53 with a thread for screwing on a nozzle. The outlet port 53 is closed. It can be opened by severing its outer end.

Die Kartusche 50 enthält eine auspressbare Masse 55, die durch die rückwärtige Öffnung 56 eingefüllt wird, bevor der Kolben 10 gesetzt wird. Die Masse 55 bildet im Regelfall nach dem Einfüllen einen Mitteldom 57, der von einem ringförmigen Graben 58 umgeben ist. Beim Setzen des Kolbens 10 gelangt zuerst das Zentrum der Kolbenbrust 11 in Kontakt mit dem Mitteldom 57. Die Masse 55 wird von der Kolbenbrust 11 nach außen verdrängt. Der vordere Schutzrand 30 verhindert das vorzeitige Verschließen des Kolbenrandes für die entweichende Luft. Außerdem wirkt der Schutzrand 30 eine Vorzentrierung des Kolbens beim Einführen in die Kartusche 50 und einen Schutz der Dichtlippe 20 bei der Lagerung und Handhabung des Kolbens sowie beim Einführen des Kolbens in die Kartusche.The cartridge 50 includes an expulsible mass 55 that is filled through the rear opening 56 before the piston 10 is set. As a rule, the mass 55 forms a central dome 57 after filling, which is surrounded by an annular trench 58. When setting the piston 10, first the center of the piston breast 11 comes into contact with the central dome 57. The mass 55 is displaced by the piston breast 11 to the outside. The front protective edge 30 prevents the premature closure of the piston edge for the escaping air. In addition, the protective edge 30 acts a pre-centering of the piston when inserted into the cartridge 50 and a protection of the sealing lip 20 during storage and handling of the piston and during insertion of the piston in the cartridge.

Claims (5)

  1. Unitary cartridge piston for squeezing a mass from a cartridge, comprising a piston front face (11), a circumferential side wall (12) and at least one flexible sealing lip (20, 21) provided at the side wall and projecting forward, wherein the side wall (12) has a circumferential or discontinuous front protective edge (30, 33) which, in axial projection, covers a portion of the at least one sealing lip,
    characterized in that
    said protective edge (30, 33) has a greater rigidity than the at least one sealing lip.
  2. Cartridge piston of claim 1, characterized in that the front protective edge (30) is provided at the piston front face (11) and projects laterally beyond the same.
  3. Cartridge piston of claim 1 or 2, characterized in that a rear protective edge (33) is provided at the rear end of the side wall (12), the diameter of the rear protective edge (33) being enlarged with respect to the side wall (12).
  4. Cartridge piston of claim 3, characterized in that the rear protective edge (33) comprises passages (35; 37; 38).
  5. Cartridge piston of claim 3 or 4, characterized in that the rear protective edge is interrupted at least once along the circumference.
EP09157743A 2008-04-12 2009-04-09 Cartridge piston Active EP2108599B1 (en)

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PL09157743T PL2108599T3 (en) 2008-04-12 2009-04-09 Cartridge piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202008005097U DE202008005097U1 (en) 2008-04-12 2008-04-12 cartridge plunger

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EP2108599A1 EP2108599A1 (en) 2009-10-14
EP2108599B1 true EP2108599B1 (en) 2010-12-01

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US9126702B2 (en) 2010-08-24 2015-09-08 Kaga Works Co., Ltd. Viscous-material filling method
US9598223B2 (en) 2012-04-02 2017-03-21 Kaga Works Co., Ltd. Plunger for pneumatic dispenser
DE102017203241A1 (en) 2017-02-28 2018-08-30 Fischbach Kg Kunststoff-Technik Piston for cartridges

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DE102010048062B4 (en) 2010-06-22 2018-08-23 Fischbach Kg Kunststoff-Technik cartridge plunger
NO334135B1 (en) * 2011-06-27 2013-12-16 Bjoernar Sjursen Nutritional ostomy system and method for allowing a person with a nutritional ostomy to participate in a meal
JP5651803B1 (en) 2014-08-25 2015-01-14 加賀ワークス株式会社 Plunger for pneumatic dispenser
JP5993077B1 (en) 2015-10-19 2016-09-14 加賀ワークス株式会社 Viscous material dispenser cartridge
DE102021108642A1 (en) * 2021-04-07 2022-10-13 Ritter Gmbh Trailing piston with supporting lip

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DE102006025873A1 (en) 2006-06-02 2007-12-06 Fischbach Kg Kunststoff-Technik Cartridge for squeezable mass, has discontinuities, provided on rear lips or on inner surface of cartridge body, which forms passage cooperating between rear lips and inner surface and passage have flow resistance, larger than openings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9126702B2 (en) 2010-08-24 2015-09-08 Kaga Works Co., Ltd. Viscous-material filling method
US9340306B2 (en) 2010-08-24 2016-05-17 Kaga Works Co., Ltd. Viscous-material filling apparatus
US9598223B2 (en) 2012-04-02 2017-03-21 Kaga Works Co., Ltd. Plunger for pneumatic dispenser
DE102017203241A1 (en) 2017-02-28 2018-08-30 Fischbach Kg Kunststoff-Technik Piston for cartridges

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PL2108599T3 (en) 2011-05-31
DE502009000202D1 (en) 2011-01-13
ATE490198T1 (en) 2010-12-15
DE202008005097U1 (en) 2009-10-29
ES2357096T3 (en) 2011-04-18
EP2108599A1 (en) 2009-10-14

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