EP2520375A2 - Closure and expression plunger for cartridges for plastic masses - Google Patents

Closure and expression plunger for cartridges for plastic masses Download PDF

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Publication number
EP2520375A2
EP2520375A2 EP12001294A EP12001294A EP2520375A2 EP 2520375 A2 EP2520375 A2 EP 2520375A2 EP 12001294 A EP12001294 A EP 12001294A EP 12001294 A EP12001294 A EP 12001294A EP 2520375 A2 EP2520375 A2 EP 2520375A2
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EP
European Patent Office
Prior art keywords
piston
sealing lip
ribs
cartridge
facing
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.)
Granted
Application number
EP12001294A
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German (de)
French (fr)
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EP2520375B1 (en
EP2520375A3 (en
Inventor
Frank Ritter
Oliver Wolf
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Ritter GmbH
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Ritter GmbH
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Priority to PL12001294T priority Critical patent/PL2520375T3/en
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Publication of EP2520375A3 publication Critical patent/EP2520375A3/en
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    • 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

Definitions

  • the invention relates to a closure and Ausdschreibkolben of elastic plastic for cartridges for plastic masses.
  • Such pistons usually consist of a piston plate which extends over the cartridge cross-section and a cylindrical skirt which adjoins it in the reverse direction.
  • sealing lips At its outer periphery of the piston is formed with sealing lips, which cooperate with the cartridge inner wall.
  • piston At least two axially spaced, provided for backward sealing lips.
  • the conventional, only backward-facing sealing lips of the piston are not sufficient for a clean seal, as when expressing the back pressure of the material acts on the sealing lips, so that they do not more perfectly tight against the cartridge wall and form standing Gumaterialfilme between the sealing lips and the cartridge wall. It has therefore begun to provide at the front of the piston a forward-facing sealing lip, which is pressed more strongly with increasing extrusion pressure by the back pressure of the filling material to the cartridge inner wall, so that the seal automatically reinforces and results in better sealing results.
  • the object of the invention is therefore to improve such a piston with forward-facing sealing lip so that the problems when inserting the piston in the open rear cartridge end can be significantly mitigated.
  • the piston according to the invention consists of a curved piston plate 1 and a cylindrical skirt 2 adjoining it backwards. On the circumference of the skirt 2, axially spaced, rearwardly facing and cooperating with the cartridge inner wall sealing lips 3 are arranged in the usual way.
  • the transition region 4 is formed on the slightly forwardly curved piston plate 1 and the skirt 2 in cross-section V-shaped, whereby an obliquely forward and outwardly facing sealing lip 5 is formed.
  • This forward facing sealing lip 5 comes to the main sealing function when expressing the filling material from the cartridge.
  • a crown-like arrangement of ribs 6 arranged on the forward-facing sealing lip 5 is provided in both illustrated embodiments of the piston.
  • These ribs 6 are arranged on the piston axis facing inside of the sealing lip 5. They are formed as radial ribs which extend slightly forward over the sealing lips and have an outwardly facing, obliquely rearwardly and outwardly extending ramp surface 7, which merges into the sealing lip edge surface 8.
  • These ramp surfaces 7 of the ribs 6 form centering and insertion aids for the sealing lip 5 when inserting the piston in the rear open cartridge end.
  • These small ribs 6 are connected to no other part of the piston except the sealing lip 5, so that the elastic sealing lip 5 is not hindered in its elastic mobility at any point of its circumference.
  • Each of these small ribs 6 is also quite narrow, so that in this respect also the elastic mobility and conformability of the sealing lip 5 is not hindered with its sealing edge on the inner wall of the cartridge.
  • FIGS. 1a to 1c and 2a to 2c differ, in particular from the respective plan view ( FIG. 1b and FIG. 2b ), in that in the first embodiment ( FIGS. 1a to 1c ) the ribs 6 are arranged distributed with equal circumferential distances on the circumference of the sealing lip while in the second embodiment ( FIGS. 2a to 2c ) the ribs 6 are arranged on both sides of a symmetrical with respect to a diameter line corresponding to a transverse axis, which in the plan view FIG. 2b indicated by dash-dotted lines. In this case, the ribs 6 respectively closest to this transverse axis are separated from each other by a distance which is significantly greater than the distances between the remaining ribs.
  • a venting function of the piston during insertion into the rear cartridge end can be promoted if a setting tool in the region of the transverse axis presses more strongly on the rear side of the piston plate than on its remaining peripheral region.
  • the piston is slightly warped when inserting with a certain bending movement about the transverse axis, so that the sealing of the forward facing sealing lip can not be made exactly over the entire piston circumference, but rather the sealing lip is leaked at diametrically opposite areas and a vent of between the piston and the filling compound located in the cartridge can take place.
  • the piston then returns to its exact round position, and the forward-facing sealing lip 5 seals over its entire circumference with the cartridge inner wall.
  • the piston plate 1 has on its rear side an inner, approximately cylindrical recessed annular projection 9, which engages the setting tool with its axial pressing pressure when inserting the piston in the rear end of the cartridge.
  • an obliquely rearwardly and inwardly extending annular projection 10 is formed on the outer region of the piston plate rear side, which engages in the expression of the cartridge of the extrusion die. The then acting axially on the piston pressing force not only causes a forward sliding of the piston, but tries to spread the sealing lip 5 to the outside. As a result, in particular in connection with the counterpressure of the filling material acting on the sealing lip 5, the sealing lip 5 with its sealing edge is pressed firmly against the inner wall of the cartridge.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

The piston has a transition region (4) formed between a piston plate (1) and a cylindrical apron (2) with V-shaped cross-section. A sealing lip (5) is formed at circumference, and diagonally points in forward and outward directions. The sealing lip comprises small radial ribs (6) distributed over the circumference at inner side that is turned toward a piston axis. The ribs are arranged over the sealing lip in the forward direction and form a radially outward pointing and diagonally backward running ramp surface (7) that projects into a forward edge surface (8) of the sealing lip.

Description

Die Erfindung betrifft einen Verschluss- und Ausdrückkolben aus elastischem Kunststoff für Kartuschen für plastische Massen.The invention relates to a closure and Ausdrückkolben of elastic plastic for cartridges for plastic masses.

Solche Kolben bestehen üblicherweise aus einer sich über den Kartuschenquerschnitt erstreckenden Kolbenplatte und einer sich rückwärts daran anschließenden zylindrischen Schürze.Such pistons usually consist of a piston plate which extends over the cartridge cross-section and a cylindrical skirt which adjoins it in the reverse direction.

An seinem Außenumfang ist der Kolben mit Dichtlippen ausgebildet, die mit der Kartuscheninnenwand zusammenwirken. Bei früher üblichen derartigen Kolben waren mindestens zwei axial beabstandete, nach rückwärts weisende Dichtlippen vorgesehen. Im Zuge der Weiterentwicklung derartiger Kolben wurde aber erkannt, daß, zumal bei höheren Auspressdrücken, die herkömmlichen, nur rückwärts weisenden Dichtlippen des Kolbens für eine saubere Abdichtung nicht ausreichen, da beim Ausdrücken auch der Gegendruck des Materials auf die Dichtlippen wirkt, so daß diese nicht mehr vollkommen dicht an der Kartuschenwand anliegen und sich stehenbleibende Füllmaterialfilme zwischen den Dichtlippen und der Kartuschenwand ausbilden. Man ist deshalb dazu übergegangen, am vorderen Bereich des Kolbens eine nach vorne weisende Dichtlippe vorzusehen, die bei zunehmendem Auspressdruck durch den Gegendruck des Füllmaterials stärker an die Kartuscheninnenwand angedrückt wird, so daß die Abdichtung sich selbsttätig verstärkt und bessere Abdichtungsergebnisse ergibt.At its outer periphery of the piston is formed with sealing lips, which cooperate with the cartridge inner wall. In previously conventional such piston at least two axially spaced, provided for backward sealing lips. In the course of further development of such piston but it was recognized that, especially at higher extrusion pressures, the conventional, only backward-facing sealing lips of the piston are not sufficient for a clean seal, as when expressing the back pressure of the material acts on the sealing lips, so that they do not more perfectly tight against the cartridge wall and form standing Füllmaterialfilme between the sealing lips and the cartridge wall. It has therefore begun to provide at the front of the piston a forward-facing sealing lip, which is pressed more strongly with increasing extrusion pressure by the back pressure of the filling material to the cartridge inner wall, so that the seal automatically reinforces and results in better sealing results.

Allerdings macht eine solche nach vorne weisende Dichtlippe das Einsetzen des Kolbens in das offene hintere Kartuschenende schwieriger, nachdem die Kartusche mit dem Füllmaterial befüllt worden ist. Denn dabei besteht die Gefahr, daß, insbesondere wenn die Führung des Kolbens beim Einsetzen nicht ganz exakt zentrisch erfolgen sollte, die nach vorne weisende Dichtlippe sich mit der rückwärtigen Kantenfläche der Kartuschenwand verhakt oder die Kartuschenwand zwischen die Dichtlippe und den eigentlichen Kolben gerät. Dies führt nicht nur zu Störungen beim Setzvorgang, sondern kann zu unbemerkten, mehr oder weniger gravierenden Beschädigungen der Dichtlippe führen, so daß die Gefahr besteht, daß möglicherweise die Abdichtung des Kolbens an der Kartuschenwand nicht perfekt ist und dann das in die Kartusche eingefüllte Füllmaterial verderben kann.However, such a forward facing sealing lip makes insertion of the piston into the open rear cartridge end more difficult after the cartridge has been filled with the filler material. Because there is a risk that, especially if the leadership of the piston when inserting should not be quite exactly centric, the after Front-facing sealing lip hooks with the rear edge surface of the cartridge wall or the cartridge wall between the sealing lip and the actual piston gets. This not only leads to disturbances in the setting process, but can lead to unnoticed, more or less serious damage to the sealing lip, so that there is a risk that the sealing of the piston on the cartridge wall may not be perfect and then spoil the filling material filled in the cartridge can.

Aufgabe der Erfindung ist es daher, eine solchen Kolben mit nach vorne weisender Dichtlippe so zu verbessern, daß die Probleme beim Einsetzen des Kolbens in das offene hintere Kartuschenende wesentlich abgemildert werden können.The object of the invention is therefore to improve such a piston with forward-facing sealing lip so that the problems when inserting the piston in the open rear cartridge end can be significantly mitigated.

Diese Aufgabe wird gemäß der Erfindung durch die im Anspruch 1 angegebene und im Anspruch 2 weiter ausgestaltete Kolbengestaltung gelöst.This object is achieved according to the invention by the recited in claim 1 and in claim 2 further configured piston design.

Zwei Ausführungsbeispiele der Erfindung werden nachstehend unter Bezugnahme auf die anliegenden Zeichnungen beschrieben, wobei in den Zeichnungen zeigen:

  • Die Figuren 1a, 1b und 1c eine erste Ausführungsform eines Kolbens nach der Erfindung in perspektivischer Ansicht, in Draufsicht und im Schnitt, und
  • die Figuren 2a, 2b und 2c eine abgewandelte Ausführungsform eines Kolbens nach der Erfindung in perspektivischer Ansicht, in Draufsicht und im Schnitt.
Two embodiments of the invention will now be described with reference to the accompanying drawings, in which:
  • The Figures 1a, 1b and 1c a first embodiment of a piston according to the invention in a perspective view, in plan view and in section, and
  • the Figures 2a, 2b and 2c a modified embodiment of a piston according to the invention in a perspective view, in plan view and in section.

Der erfindungsgemäße Kolben besteht bei beiden Ausführungsformen aus einer gewölbten Kolbenplatte 1 und einer sich daran rückwärts anschließenden zylindrischen Schürze 2. Am Umfang der Schürze 2 sind in üblicher Weise axial beabstandete, nach hinten weisende und mit der Kartuscheninnenwand zusammenwirkende Dichtlippen 3 angeordnet.In both embodiments, the piston according to the invention consists of a curved piston plate 1 and a cylindrical skirt 2 adjoining it backwards. On the circumference of the skirt 2, axially spaced, rearwardly facing and cooperating with the cartridge inner wall sealing lips 3 are arranged in the usual way.

Wie man aus den Schnittdarstellungen nach den Figuren 1c und 2c sieht, ist der Übergangsbereich 4 an der etwas nach vorne gewölbten Kolbenplatte 1 und der Schürze 2 im Querschnitt V-förmig ausgebildet, wodurch eine schräg nach vorne und auswärts weisende Dichtlippe 5 gebildet ist. Dieser nach vorne weisenden Dichtlippe 5 kommt beim Ausdrücken des Füllmaterials aus der Kartusche die hauptsächliche Abdichtfunktion zu.As can be seen from the sectional views after the FIGS. 1c and 2c sees, the transition region 4 is formed on the slightly forwardly curved piston plate 1 and the skirt 2 in cross-section V-shaped, whereby an obliquely forward and outwardly facing sealing lip 5 is formed. This forward facing sealing lip 5 comes to the main sealing function when expressing the filling material from the cartridge.

Wie aus den Zeichnungen ersichtlich ist, ist bei beiden dargestellten Ausführungsformen des Kolbens eine kranzartige Anordnung von an der nach vorne weisenden Dichtlippe 5 angeordneten Rippen 6 vorgesehen. Diese Rippen 6 sind an der Kolbenachse zugewandten Innenseite der Dichtlippe 5 angeordnet. Sie sind als radiale Rippen ausgebildet, die sich etwas nach vorne über die Dichtlippen hinaus erstrecken und eine nach außen weisende, schräg rückwärts und auswärts verlaufende Rampenfläche 7 haben, die in die Dichtlippenkantenfläche 8 übergeht. Diese Rampenflächen 7 der Rippen 6 bilden Zentrier- und Einführhilfen für die Dichtlippe 5 beim Einsetzen des Kolbens in das hintere offene Kartuschenende.As can be seen from the drawings, a crown-like arrangement of ribs 6 arranged on the forward-facing sealing lip 5 is provided in both illustrated embodiments of the piston. These ribs 6 are arranged on the piston axis facing inside of the sealing lip 5. They are formed as radial ribs which extend slightly forward over the sealing lips and have an outwardly facing, obliquely rearwardly and outwardly extending ramp surface 7, which merges into the sealing lip edge surface 8. These ramp surfaces 7 of the ribs 6 form centering and insertion aids for the sealing lip 5 when inserting the piston in the rear open cartridge end.

Diese kleinen Rippen 6 sind mit keinem anderen Teil des Kolbens außer der Dichtlippe 5 verbunden, so daß die elastische Dichtlippe 5 in ihrer elastischen Beweglichkeit an jeder Stelle ihres Umfangs nicht behindert wird. Jede dieser kleinen Rippen 6 ist auch ziemlich schmal, so daß auch insofern die elastische Beweglichkeit und Anschmiegsamkeit der Dichtlippe 5 mit ihrer Dichtkante an die Kartuscheninnenwand nicht behindert wird.These small ribs 6 are connected to no other part of the piston except the sealing lip 5, so that the elastic sealing lip 5 is not hindered in its elastic mobility at any point of its circumference. Each of these small ribs 6 is also quite narrow, so that in this respect also the elastic mobility and conformability of the sealing lip 5 is not hindered with its sealing edge on the inner wall of the cartridge.

Man erhält daher durch Anordnung dieser kleinen Rippen 6 an der nach vorne weisenden Dichtlippe 5 eine selbsttätige Zentrierung, falls der Kolben vom Setzwerkzeug einmal nicht genau zentrisch geführt werden sollte, oder wenn eine geringe Unrundheit der Kartuschenwand am offenen hinteren Kartuschenende ein Einsetzen des Kolbens sonst erschweren würde. Insbesondere wird dadurch auch zuverlässig verhindert, daß das rückwärtige Ende der Kartuschenwand örtlich zwischen die Dichtlippe und die Kolbenplatte gerät.Therefore, by arranging these small ribs 6 on the forwardly facing sealing lip 5, an automatic centering is obtained if the piston should not be guided precisely by the setting tool, or if a slight out-of-roundness of the cartridge wall at the open rear end of the cartridge complicates insertion of the piston would. In particular, this reliably prevents the rear end of the cartridge wall from getting locally between the sealing lip and the piston plate.

Die Ausführungsformen nach den Figuren 1a bis 1c und 2a bis 2c unterscheiden sich, wie insbesondere aus der jeweiligen Draufsicht (Figur 1b und Figur 2b) ersichtlich ist, dadurch, daß bei der ersten Ausführungsform (Figuren 1a bis 1c) die Rippen 6 mit gleichen Umfangsabständen am Umfang der Dichtlippe verteilt angeordnet sind während bei der zweiten Ausführungsform (Figuren 2a bis 2c) die Rippen 6 beiderseits einer und symmetrisch mit Bezug auf eine einer Durchmesserlinie entsprechenden Querachse angeordnet sind, die in der Draufsicht nach Figur 2b strichpunktiert angedeutet ist. Dabei sind die dieser Querachse jeweils nächstgelegenen Rippen 6 durch einen Abstand voneinander entfernt, der deutlich größer als die Abstände zwischen den übrigen Rippen ist.The embodiments according to the FIGS. 1a to 1c and 2a to 2c differ, in particular from the respective plan view ( FIG. 1b and FIG. 2b ), in that in the first embodiment ( FIGS. 1a to 1c ) the ribs 6 are arranged distributed with equal circumferential distances on the circumference of the sealing lip while in the second embodiment ( FIGS. 2a to 2c ) the ribs 6 are arranged on both sides of a symmetrical with respect to a diameter line corresponding to a transverse axis, which in the plan view FIG. 2b indicated by dash-dotted lines. In this case, the ribs 6 respectively closest to this transverse axis are separated from each other by a distance which is significantly greater than the distances between the remaining ribs.

Durch diese Ausgestaltung der Rippenanordnung bei der zweiten Ausführungsform kann eine Entlüftefunktion des Kolbens beim Einsetzen in das hintere Kartuschenende begünstigt werden, wenn ein Setzwerkzeug im Bereich der Querachse stärker auf die Rückseite der Kolbenplatte drückt als an deren übrigem Umfangsbereich. Dadurch wird der Kolben nämlich beim Einsetzen leicht mit einer gewissen Biegebewegung um die Querachse verzogen, so daß die Abdichtung der nach vorne weisenden Dichtlippe nicht mehr über den ganzen Kolbenumfang exakt erfolgen kann, sondern vielmehr die Dichtlippe an diametral gegenüberliegenden Bereichen undicht wird und eine Entlüftung von zwischen dem Kolben und der in der Kartusche befindlichen Füllmasse erfolgen kann. Beim Wegnehmen des Setzwerkzeugs kehrt der Kolben dann wieder in seine exakt runde Stellung zurück, und die nach vorne weisende Dichtlippe 5 dichtet über ihren ganzen Umfang mit der Kartuscheninnenwand ab.By means of this embodiment of the rib arrangement in the second embodiment, a venting function of the piston during insertion into the rear cartridge end can be promoted if a setting tool in the region of the transverse axis presses more strongly on the rear side of the piston plate than on its remaining peripheral region. Thus, the piston is slightly warped when inserting with a certain bending movement about the transverse axis, so that the sealing of the forward facing sealing lip can not be made exactly over the entire piston circumference, but rather the sealing lip is leaked at diametrically opposite areas and a vent of between the piston and the filling compound located in the cartridge can take place. When removing the setting tool, the piston then returns to its exact round position, and the forward-facing sealing lip 5 seals over its entire circumference with the cartridge inner wall.

Aus den Schnittdarstellungen nach den Figuren 1c und 2c ist esichtlich, daß die Kolbenplatte 1 an ihrer Rückseite einen inneren, etwa zylindrisch zurückspringenden Ringansatz 9 aufweist, an dem beim Einsetzen des Kolbens in das hintere Kartuschenende das Setzwerkzeug mit seinem axialen Pressdruck angreift. Außerdem ist ein schräg rückwärts und einwärts verlaufender Ringansatz 10 am äußeren Bereich der Kolbenplattenrückseite gebildet, an dem beim Ausdrücken der Kartusche der Auspressstempel angreift. Die dann axial auf den Kolben wirkende Presskraft bewirkt nicht nur ein Vorwärtsschieben des Kolbens, sondern versucht die Dichtlippe 5 nach außen zu spreizen. Dadurch wird, insbesondere im Zusammenhang mit dem auf die Dichtlippe 5 wirkenden Gegendruck des Füllmaterials, die Dichtlippe 5 mit ihrer Dichtkante fest an die Kartuscheninnenwand angedrückt.From the sectional views of the FIGS. 1c and 2c It is apparent that the piston plate 1 has on its rear side an inner, approximately cylindrical recessed annular projection 9, which engages the setting tool with its axial pressing pressure when inserting the piston in the rear end of the cartridge. In addition, an obliquely rearwardly and inwardly extending annular projection 10 is formed on the outer region of the piston plate rear side, which engages in the expression of the cartridge of the extrusion die. The then acting axially on the piston pressing force not only causes a forward sliding of the piston, but tries to spread the sealing lip 5 to the outside. As a result, in particular in connection with the counterpressure of the filling material acting on the sealing lip 5, the sealing lip 5 with its sealing edge is pressed firmly against the inner wall of the cartridge.

Claims (2)

Verschluss- und Ausdrückkolben für Kartuschen, mit einer Kolbenplatte (1) und einer sich daran rückwärts anschließenden zylindrischen Schürze (2), wobei der Übergangsbereich (4) zwischen Kolbenplatte (1) und Schürze (2) mit V-artigem Querschnitt ausgebildet ist und am Umfang eine schräg nach vorne und auswärts weisende Dichtlippe (5) bildet,
dadurch gekennzeichnet, daß die Dichtlippe (5) an ihrer der Kolbenachse zugewandten Innenseite mit einer Mehrzahl von über den Umfang verteilten kleinen radialen Rippen (6) versehen ist, die nach vorne über die Dichtlippe überstehen und jeweils eine radial auswärts weisende, schräg rückwärts verlaufende und in die Vorderkantenfläche (8) der Dichtlippe (5) übergehende Rampenfläche (7) bilden.Closing and Ausdrückkolben for cartridges, with a piston plate (1) and a subsequent rear cylindrical skirt (2), wherein the transition region (4) between the piston plate (1) and skirt (2) is formed with V-like cross-section and on Scope forms an obliquely forward and outward-facing sealing lip (5),
characterized in that the sealing lip (5) is provided on its inner side facing the piston axis with a plurality of circumferentially distributed small radial ribs (6) projecting forward over the sealing lip and each having a radially outwardly facing, obliquely backward and in the leading edge surface (8) of the sealing lip (5) transition ramp surface (7) form. Kolben nach Anspruch 1, wobei die Rippen (6) symmetrisch beiderseits einer und mit Bezug auf eine einer Durchmesserlinie entsprechende Querachse des Kolbens symmetrisch angeordnet sind, und wobei der umfangsmäßige Abstand zwischen den jeweils der Querachse nächst gelegenen Rippen deutlich größer als die übrigen Rippenabstände ist.Piston according to claim 1, wherein the ribs (6) are arranged symmetrically on either side of a transverse axis of the piston corresponding to a diameter line, and wherein the circumferential distance between the respective ribs closest to the transverse axis is significantly greater than the remaining rib distances.
EP12001294.3A 2011-05-04 2012-02-28 Closure and expression plunger for cartridges for plastic masses Active EP2520375B1 (en)

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Application Number Priority Date Filing Date Title
PL12001294T PL2520375T3 (en) 2011-05-04 2012-02-28 Closure and expression plunger for cartridges for plastic masses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202011100254U DE202011100254U1 (en) 2011-05-04 2011-05-04 Closing and ejection piston for cartridges for plastic masses

Publications (3)

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EP2520375A2 true EP2520375A2 (en) 2012-11-07
EP2520375A3 EP2520375A3 (en) 2012-12-05
EP2520375B1 EP2520375B1 (en) 2014-07-30

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DE (1) DE202011100254U1 (en)
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US7913881B2 (en) * 2003-11-13 2011-03-29 Meritool Llc Viscous material dispenser piston

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4070891A1 (en) 2021-04-07 2022-10-12 Ritter GmbH Trailing piston with support lip

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EP2520375B1 (en) 2014-07-30
PL2520375T3 (en) 2014-12-31
DE202011100254U1 (en) 2011-08-22
EP2520375A3 (en) 2012-12-05

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