EP3608029A1 - Cartridge piston with centering aid - Google Patents

Cartridge piston with centering aid Download PDF

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Publication number
EP3608029A1
EP3608029A1 EP19000324.4A EP19000324A EP3608029A1 EP 3608029 A1 EP3608029 A1 EP 3608029A1 EP 19000324 A EP19000324 A EP 19000324A EP 3608029 A1 EP3608029 A1 EP 3608029A1
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EP
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Prior art keywords
wall
ribs
sealing lip
piston
cartridge
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EP19000324.4A
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German (de)
French (fr)
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EP3608029B1 (en
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Frank Ritter
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Ritter GmbH
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Ritter GmbH
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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

Definitions

  • the invention relates to a cartridge piston which is designed with a formation designed as an improved centering aid in order to facilitate centering of the piston when it is inserted into the rear end of a cartridge.
  • Cartridge pistons are placed in cartridges filled with the filling compound by mechanically inserting the piston into the rear end of the cartridge. Pistons are fed into the piston setting machine and are then inserted axially into the rear end of a cartridge filled with filling compound. It is important that the plunger, which inevitably has a certain, albeit slight, play in movement so that it can be fed into the plunger setting machine smoothly, is centered in the rear end of the cartridge in the initial phase of the insertion process. There is a risk here that the piston can tilt if it first comes into contact with the cartridge wall on one side.
  • the object of the invention is to design a cartridge piston so that an optimal centering and the best possible protection of the sealing lip can take place during the setting process without impairing its other functions.
  • the cover wall is axially stepped near the transition into the peripheral wall and has a ring of radial Provide ribs whose forward-facing edges continue the contour of the top wall and which protrude radially slightly beyond the peripheral wall.
  • the radial ribs serve as centering ribs and are arranged axially in front of the sealing lip which extends obliquely outwards from the casing wall and have a radial extension which ends in front of the sealing lip, so that the sealing lip can be used optimally.
  • the radial ribs are arranged with relatively small angular distances from one another, preferably with angular distances of not more than 30 °, and preferably with angular distances from 20 ° to 15 °.
  • the radial ribs are located axially in front of the sealing lip arranged on the jacket wall and extending to the front, the axial height of the ribs results in a sufficient axial distance between the front piston end and the front end of the sealing lip so that the ribs are precentered when Inserting the piston have the piston centered before the axially following sealing lip comes into contact with the insertion slope of the cartridge. Because the sealing lip, which is thin and therefore sensitive due to the necessary flexibility, is not touched until the piston is already centered, the risk of damage to the sealing lip due to one-sided loads in cooperation with the cartridge wall is greatly reduced. Since the ribs are located axially in front of the sealing lip, the sealing lip has unhindered radial mobility over the entire circumference of the piston despite a certain radial projection of the ribs over the lateral wall of the piston.
  • the 1 and 2 show the piston according to the invention, which has a top wall 1, which is curved slightly forward in the usual way, and a jacket wall 2 adjoining it on the circumference backwards. Approximately in the middle of the axial extent the jacket wall 2 is arranged thereon via a connecting projection 3 a forwardly pointing and slightly outwardly inclined sealing lip 4, which also has a leg 5 running from the connecting projection 3 backwards and slightly obliquely outwards. The rear region of the peripheral wall 2 of the piston widens slightly outwards.
  • the top wall 1 of the piston has an axial step 6 in the area of its circumference, as can be seen in the left half of the Fig. 2 sees clearly.
  • a ring of radial ribs 7 Arranged on this gradation 6 is a ring of radial ribs 7, the forward-facing edges of which harmoniously continue the contour of the region of the top wall 1 lying radially within the gradation 6, and the radially somewhat over the circumference of the jacket wall 6 in its region axially in front of the connecting shoulder 3 protrude and continue axially along this lateral wall area a short distance to the rear.
  • these ribs 7 have mutual angular distances of 15 °. As already mentioned, it is important for a good pre-centering that these ribs 7 have relatively small and uniform angular distances from one another and are therefore relatively numerous, so that an effective pre-centering at a plurality of evenly, namely rotationally symmetrical, points distributed over the circumference
  • the piston can be inserted into the rear end of a cartridge.
  • the angular spacing of the ribs 7 should therefore not be less than 30 °.
  • the numerous ribs mean that the piston has a very high degree of rigidity locally in the area of the top wall circumference, and thus in the connection area between top wall 1 and jacket wall 2, which in turn considerably promotes pre-centering during insertion and prevents deformation of the piston when asymmetrical forces arise which could otherwise lead to tilting.
  • the ribs 7 have a relatively large axial extent, and the sealing lip 4 is located axially behind these ribs 7.
  • the above-mentioned effect occurs that pre-centering can take place over a relatively large axial distance when the piston is inserted, and that Piston in the rear end of the cartridge is already very well centered before the front end of the sealing lip 4 can come into contact with the wall of the cartridge for the first time.
  • the radial centering ribs 7 end radially in front of the sealing lip, so that they can be used without hindrance can and has an unimpeded radial freedom of movement in order to be able to optimally cooperate with the cartridge wall in any position and also in the event of non-roundness.

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

Abstract

Ein Kartuschenkolben zum Auspressen viskoser Massen aus einer Kartusche weist eine vordere Deckwand (1), eine sich an deren Umfang anschließende, sich nach hinten erstreckenden Mantelwand (2), und eine mit der Mantelwand (2) verbundene, nach vorne ragende flexible Dichtlippe (4) zum Abdichten mit einer Kartuschenwand auf, wobei die Deckwand (1) nahe ihres Umfangs eine axiale, nach rückwärts springende Abstufung (6) aufweist. Auf dieser Abstufung (6) ist ein Kranz von radialen Rippen (7) mit drehsymmetrischen kleinen Winkelabständen angeordnet, deren nach vorne weisenden Kanten der Kontur des radial innerhalb der Abstufung (6) befindlichen Bereichs der Deckwand (1) folgen und die radial etwas über den vorderen Bereich der Mantelwand (2) überstehen, wobei die Dichtlippe (4) sich axial hinterhalb der Rippen (7) befindet.A cartridge piston for pressing out viscous masses from a cartridge has a front cover wall (1), a jacket wall (2) which extends to the periphery and extends to the rear, and a flexible sealing lip (4) which projects to the front and which is connected to the jacket wall (2) ) for sealing with a cartridge wall, the top wall (1) having an axial, backwards jumping step (6) near its circumference. Arranged on this gradation (6) is a ring of radial ribs (7) with rotationally symmetrical small angular distances, the forward-facing edges of which follow the contour of the region of the top wall (1) located radially within the gradation (6) and which radially are slightly above the protrude from the front area of the jacket wall (2), the sealing lip (4) being located axially behind the ribs (7).

Description

Die Erfindung betrifft einen Kartuschenkolben, der mit einer als verbesserte Zentrierhilfe ausgebildeten Formation ausgebildet ist, um das Zentrieren des Kolbens beim Einführen in das hintere Ende einer Kartusche zu erleichtern.The invention relates to a cartridge piston which is designed with a formation designed as an improved centering aid in order to facilitate centering of the piston when it is inserted into the rear end of a cartridge.

Das Setzen von Kartuschenkolben in mit der Füllmasse befüllten Kartuschen erfolgt durch maschinelles Einsetzen des Kolbens in das hintere Ende der Kartusche. Dabei werden Kolben in die Kolbensetzmaschine zugeführt und von dieser dann jeweils axial in das hintere Ende einer mit Füllmasse gefüllten Kartusche eingeschoben. Dabei ist es wichtig, dass der Kolben, der unvermeidlich ein gewisses, wenn auch geringes Bewegungsspiel hat, damit sein Zuführen in die Kolbensetzmaschine störungsfrei gelingt, in der Anfangsphase des Einführvorgangs in das hintere Kartuschenende zentriert wird. Hierbei besteht die Gefahr, dass der Kolben, wenn er zunächst einseitig mit der Kartuschenwand in Berührung kommt, verkanten kann. Dies kann zur Beschädigung der dünnen und deshalb empfindlichen Dichtlippe am Kolbenumfang führen, mit der Folge, dass der Kolben dann das hintere Kartuschenende nicht mehr zuverlässig abgedichtet, und dass die Füllmasse durch Luftzutritt verdirbt. Deshalb ist es wichtig, dass der Kolben bestmöglich zentriert in das hintere Kartuschenende eingeführt wird, um ein Verkanten beim Einführen zu vermeiden und sicherzustellen, dass die Kolbenumfang angeordnete Dichtlippe beim Einsetzen nicht beschädigt wird, keine Verformung des Kolbens erfolgt und der Kolben somit nach dem Setzen das hintere Ende der Kartusche zuverlässig dicht verschließt.Cartridge pistons are placed in cartridges filled with the filling compound by mechanically inserting the piston into the rear end of the cartridge. Pistons are fed into the piston setting machine and are then inserted axially into the rear end of a cartridge filled with filling compound. It is important that the plunger, which inevitably has a certain, albeit slight, play in movement so that it can be fed into the plunger setting machine smoothly, is centered in the rear end of the cartridge in the initial phase of the insertion process. There is a risk here that the piston can tilt if it first comes into contact with the cartridge wall on one side. This can damage the thin and therefore sensitive sealing lip on the circumference of the piston, with the result that the piston then no longer reliably seals the rear end of the cartridge and that the filling compound spoils due to air access. It is therefore important that the piston is inserted as centered as possible into the rear end of the cartridge in order to avoid tilting during insertion and to ensure that the sealing lip arranged around the piston is not damaged during insertion, that the piston is not deformed, and that the piston is thus set reliably seals the rear end of the cartridge.

Aufgabe der Erfindung ist es, einen Kartuschenkolben so zu gestalten, dass ohne Beeinträchtigung seiner übrigen Funktionen eine optimale Zentrierung und ein bestmöglicher Schutz der Dichtlippe beim Setzvorgang stattfinden kann.The object of the invention is to design a cartridge piston so that an optimal centering and the best possible protection of the sealing lip can take place during the setting process without impairing its other functions.

Diese Aufgabe wird gemäß der Erfindung durch die im Anspruch 1 angeordnete Anordnung gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved according to the invention by the arrangement arranged in claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

Erfindungsgemäß ist bei einem Kolben, der eine vordere Deckwand, eine sich daran anschließende und nach hinten erstreckende Umfangswand, und eine an der Umfangswand angeordnete, nach vorne ragende Dichtlippe aufweist, die Deckwand nahe dem Übergang in die Umfangswand axial abgestuft und mit einem Kranz von radialen Rippen versehen, deren nach vorne weisende Kanten die Kontur der Deckwand fortsetzen, und die radial leicht über die Umfangswand vorstehen. Die radialen Rippen dienen als Zentrierrippen und sind axial vorderhalb der sich von der Mantelwand aus nach vorne schräg auswärts erstreckenden Dichtlippe angeordnet und haben eine radiale Ausdehnung, die vor der Dichtlippe endet, so dass sie Dichtlippe optimal zum Einsatz kommen kann.According to the invention, in the case of a piston which has a front cover wall, an adjoining and extending rearward peripheral wall, and a sealing lip which is arranged on the peripheral wall and projects forward, the cover wall is axially stepped near the transition into the peripheral wall and has a ring of radial Provide ribs whose forward-facing edges continue the contour of the top wall and which protrude radially slightly beyond the peripheral wall. The radial ribs serve as centering ribs and are arranged axially in front of the sealing lip which extends obliquely outwards from the casing wall and have a radial extension which ends in front of the sealing lip, so that the sealing lip can be used optimally.

Die radialen Rippen sind mit relativ kleinen Winkelabständen voneinander angeordnet, vorzugsweise mit Winkelabständen von nicht mehr als 30°, und dabei vorzugsweise mit Winkelabständen von 20° bis 15°.The radial ribs are arranged with relatively small angular distances from one another, preferably with angular distances of not more than 30 °, and preferably with angular distances from 20 ° to 15 °.

Durch die aufgrund der relativ kleinen Winkelabstände relativ große Anzahl radialer Rippen am vorderen Kolbenumfang erfolgt beim Setzen des Kolbens eine sehr gute Vorzentrierung an einer Vielzahl von gleichmäßig über den Umfang verteilten Stellen im Zusammenwirken mit der üblicherweise am hinteren Kartuschenende vorgesehenen Einführschräge. Dabei ist wegen der nur punktuellen Berührung der einzelnen Rippen mit der Kartuschenwand der bei dieser Berührung auftretende Reibungswiderstand nur gering, andererseits aber durch den Rippenkranz die Steifigkeit des Umfangsbereichs der Deckwand am Übergang zur Mantelwand sehr hoch, was eine entsprechend geringe Verkantungsneigung bedingt. Dies steht im Gegensatz zu herkömmlichen Kolben, bei denen ein geschlossener Deckwandumfang am vorderen Kolbenende beim Setzen mit der Einführschräge der Kartusche in Berührung kommt, wo bei nicht exakt zentrischem Einführen eine hohe einseitige Reibung zwischen Kolben und Kartusche auftritt und durch Kippen des Kolbens um diese einseitige Reibungslinie ein Verkanten des Kolbens und ein Verformen beim Einsetzen begünstigt wird. Andererseits sorgen die zahlreichen Rippen bei dem erfindungsgemäßen Kolben im Gegensatz zu Ausführungsformen, die Rippen nur in größeren Abständen am vorderen Kolbenende vorsehen, für eine über den ganzen Umfang gleichmäßig wirkende Vorzentrierung. Da die Rippen an ihrer Vorderseite exakt die Deckwandkontur fortsetzen, was durch die axiale Abstufung der Deckwand am Kolbenumfang möglich ist, hat der Kolben keine störenden axialen Überstände nach vorne.Due to the relatively large number of radial ribs on the front piston circumference due to the relatively small angular spacing, when the piston is set, there is very good pre-centering at a number of points distributed evenly over the circumference in cooperation with the insertion slope usually provided at the rear end of the cartridge. Because of the only selective contact of the individual ribs with the cartridge wall, the frictional resistance that occurs with this contact is only slight, but on the other hand the rigidity of the circumferential area of the top wall at the transition to the jacket wall is very high due to the rib ring, which requires a correspondingly low tendency to tilt. This is in contrast to conventional pistons, in which a closed top wall circumference at the front end of the piston comes into contact with the insertion slope of the cartridge when inserting, where a high one-sided insertion is not exactly central Friction occurs between the piston and the cartridge, and tilting of the piston around this one-sided line of friction causes the piston to tilt and deform when inserted. On the other hand, the numerous ribs in the piston according to the invention, in contrast to embodiments which only provide ribs at larger distances at the front piston end, ensure precentering which acts uniformly over the entire circumference. Since the ribs on the front continue exactly the top wall contour, which is possible due to the axial gradation of the top wall on the piston circumference, the piston has no disturbing axial protrusions to the front.

Da die radialen Rippen sich axial vorderhalb der an der Mantelwand angeordneten, sich nach vorne erstreckenden Dichtlippe befinden, ergibt sich durch die axiale Höhe der Rippen eine ausreichende axiale Distanz zwischen dem vorderen Kolbenende und dem vorderen Ende der Dichtlippe, damit die Vorzentrierung durch die Rippen beim Einsetzen des Kolbens den Kolben zentriert haben, bevor die axial nachfolgende Dichtlippe mit der Einführschräge der Kartusche in Berührung kommt. Weil im Zeitpunkt der ersten Berührung der wegen der notwendigen Flexibilität dünnen und daher empfindlichen Dichtlippe erst erfolgt, wenn der Kolben bereits zentriert ist, ist die Gefahr einer Beschädigung der Dichtlippe durch einseitige Belastungen im Zusammenwirken mit der Kartuschenwand stark reduziert. Da die Rippen sich axial vorderhalb der Dichtlippe befinden, hat die Dichtlippe trotz eines gewissen radialen Überstands der Rippen über die Mantelwand des Kolbens über den gesamten Kolbenumfang eine ungehinderte radiale Beweglichkeit.Since the radial ribs are located axially in front of the sealing lip arranged on the jacket wall and extending to the front, the axial height of the ribs results in a sufficient axial distance between the front piston end and the front end of the sealing lip so that the ribs are precentered when Inserting the piston have the piston centered before the axially following sealing lip comes into contact with the insertion slope of the cartridge. Because the sealing lip, which is thin and therefore sensitive due to the necessary flexibility, is not touched until the piston is already centered, the risk of damage to the sealing lip due to one-sided loads in cooperation with the cartridge wall is greatly reduced. Since the ribs are located axially in front of the sealing lip, the sealing lip has unhindered radial mobility over the entire circumference of the piston despite a certain radial projection of the ribs over the lateral wall of the piston.

Ein Ausführungsbeispiel der Erfindung wird nachstehend unter Bezugnahme auf die anliegenden Zeichnungen näher beschrieben, in denen zeigt:

Fig. 1
eine Draufsicht des Kolbens nach der Erfindung, und
Fig. 2
eine den Kolben in der linken Hälfte in der Seitenansicht und in der rechten Hälfte im Schnitt zeigende Darstellung.
An embodiment of the invention is described below with reference to the accompanying drawings, in which:
Fig. 1
a plan view of the piston according to the invention, and
Fig. 2
a representation of the piston in the left half in side view and in the right half in section.

Die Fig. 1 und 2 der Zeichnungen zeigen den erfindungsgemäßen Kolben, der eine in üblicher Weise leicht nach vorne gewölbte Deckwand 1 und eine sich daran am Umfang rückwärts anschließende Mantelwand 2 aufweist. Etwa in der Mitte der axialen Ausdehnung der Mantelwand 2 ist daran über einen Verbindungsansatz 3 eine nach vorne weisende und leicht auswärts geneigte Dichtlippe 4 angeordnet, die auch einen vom Verbindungsansatz 3 aus nach rückwärts und leicht schräg auswärts verlaufenden Schenkel 5 aufweist. Der rückwärtige Bereich der Umfangswand 2 des Kolbens erweitert sich leicht nach außen.The 1 and 2 The drawings show the piston according to the invention, which has a top wall 1, which is curved slightly forward in the usual way, and a jacket wall 2 adjoining it on the circumference backwards. Approximately in the middle of the axial extent the jacket wall 2 is arranged thereon via a connecting projection 3 a forwardly pointing and slightly outwardly inclined sealing lip 4, which also has a leg 5 running from the connecting projection 3 backwards and slightly obliquely outwards. The rear region of the peripheral wall 2 of the piston widens slightly outwards.

Die Deckwand 1 des Kolbens hat im Bereich ihres Umfangs eine axiale Abstufung 6, wie man in der linken Hälfte der Fig. 2 deutlich sieht. Auf dieser Abstufung 6 ist ein Kranz radialer Rippen 7 angeordnet, deren nach vorne weisende Kanten die Kontur des radial innerhalb der Abstufung 6 liegenden Bereichs der Deckwand 1 harmonisch fortsetzen, und die radial etwas über den Umfang der Mantelwand 6 in deren Bereich axial vorderhalb des Verbindungsansatzes 3 überstehen und sich auch entlang dieses Mantelwandbereichs axial noch um eine kurze Distanz nach hinten fortsetzen.The top wall 1 of the piston has an axial step 6 in the area of its circumference, as can be seen in the left half of the Fig. 2 sees clearly. Arranged on this gradation 6 is a ring of radial ribs 7, the forward-facing edges of which harmoniously continue the contour of the region of the top wall 1 lying radially within the gradation 6, and the radially somewhat over the circumference of the jacket wall 6 in its region axially in front of the connecting shoulder 3 protrude and continue axially along this lateral wall area a short distance to the rear.

Beim Ausführungsbeispiel haben diese Rippen 7 gegenseitige Winkelabstände von 15°. Wie schon gesagt, ist es für eine gute Vorzentrierung von Bedeutung, dass diese Rippen 7 relativ kleine und gleichmäßige Winkelabstände voneinander haben und daher relativ zahlreich sind, so dass an einer Vielzahl von gleichmäßig, nämlich drehsymmetrisch, über den Umfang verteilten Punkten eine effektive Vorzentrierung beim Einsetzen des Kolbens in das hintere Ende einer Kartusche erfolgen kann. Die Winkelabstände der Rippen 7 sollten daher nicht weniger als 30° betragen. Die zahlreichen Rippen führen dazu, dass der Kolben lokal im Bereich des Deckwandumfangs, und somit im Verbindungsbereich zwischen Deckwand 1 und Mantelwand 2, eine sehr hohe Steifigkeit hat, was wiederum die Vorzentrierung beim Einführen erheblich begünstigt und einer Verformung des Kolbens beim Auftreten unsymmetrischer Einsatzkräfte vermeidet, die sonst zu einem Verkanten führen könnten.In the exemplary embodiment, these ribs 7 have mutual angular distances of 15 °. As already mentioned, it is important for a good pre-centering that these ribs 7 have relatively small and uniform angular distances from one another and are therefore relatively numerous, so that an effective pre-centering at a plurality of evenly, namely rotationally symmetrical, points distributed over the circumference The piston can be inserted into the rear end of a cartridge. The angular spacing of the ribs 7 should therefore not be less than 30 °. The numerous ribs mean that the piston has a very high degree of rigidity locally in the area of the top wall circumference, and thus in the connection area between top wall 1 and jacket wall 2, which in turn considerably promotes pre-centering during insertion and prevents deformation of the piston when asymmetrical forces arise which could otherwise lead to tilting.

Wie man aus Fig. 2 deutlich sieht, haben die Rippen 7 eine relativ große axiale Ausdehnung, und die Dichtlippe 4 befindet sich axial hinterhalb dieser Rippen 7. Dadurch tritt die schon oben genannte Wirkung ein, dass beim Einsetzen des Kolbens eine Vorzentrierung über eine relativ große Axialdistanz erfolgen kann und der Kolben im hinteren Kartuschenende bereits sehr gut zentriert ist, bevor das vordere Ende der Dichtlippe 4 erstmals mit der Kartuschenwand in Berührung kommen kann. Außerdem enden die radialen Zentrierrippen 7 radial vor der Dichtlippe, so dass diese ungehindert zum Einsatz kommen kann und einen ungehinderten radialen Bewegungsspielraum hat, um in jeder Lage und auch bei etwaigen Unrundheiten optimal abdichtend mit der Kartuschenwand zusammenwirken zu können.How to get out Fig. 2 clearly sees, the ribs 7 have a relatively large axial extent, and the sealing lip 4 is located axially behind these ribs 7. As a result, the above-mentioned effect occurs that pre-centering can take place over a relatively large axial distance when the piston is inserted, and that Piston in the rear end of the cartridge is already very well centered before the front end of the sealing lip 4 can come into contact with the wall of the cartridge for the first time. In addition, the radial centering ribs 7 end radially in front of the sealing lip, so that they can be used without hindrance can and has an unimpeded radial freedom of movement in order to be able to optimally cooperate with the cartridge wall in any position and also in the event of non-roundness.

Claims (7)

Kartuschenkolben zum Auspressen viskoser Massen aus einer Kartusche, mit einer vorderen Deckwand (1), einer sich an deren Umfang anschließenden, sich nach hinten erstreckenden Mantelwand (2), und einer mit der Mantelwand (2) verbundenen, nach vorne ragenden flexiblen Dichtlippe (4) zum Abdichten mit einer Kartuschenwand,
dadurch gekennzeichnet, dass die Deckwand (1) nahe ihres Umfangs eine axiale, nach rückwärts springende Abstufung (6) aufweist und dass auf dieser Abstufung (6) ein Kranz von radialen Rippen (7) mit drehsymmetrischen kleinen Winkelabständen angeordnet ist, deren nach vorne weisenden Kanten der Kontur des radial innerhalb der Abstufung (6) befindlichen Bereichs der Deckwand (1) folgen und die radial etwas über den vorderen Bereich der Mantelwand (2) überstehen, und wobei die Dichtlippe (4) sich axial hinterhalb der Rippen (7) befindet.Cartridge plunger for pressing out viscous masses from a cartridge, with a front cover wall (1), a jacket wall (2) which extends to the periphery and extends to the rear, and a flexible sealing lip (4) which projects to the front and which is connected to the jacket wall (2) ) for sealing with a cartridge wall,
characterized in that the top wall (1) has an axial, rearward jumping step (6) near its circumference and that on this step (6) a ring of radial ribs (7) is arranged with rotationally symmetrical small angular spacings , the ones pointing towards the front Edges follow the contour of the area of the cover wall (1) located radially within the step (6) and which protrude radially somewhat beyond the front area of the casing wall (2), and the sealing lip (4) is located axially behind the ribs (7) , Kolben nach Anspruch 1, wobei die Rippen (7) sich von der Abstufung (6) der Deckwand (1) aus noch um eine kurze Distanz axial entlang der Mantelwand (2) erstrecken.Piston according to claim 1, wherein the ribs (7) from the step (6) of the top wall (1) extend a short distance axially along the jacket wall (2). Kolben nach Anspruch 1 oder 2, wobei die Rippen (7) mit ihrer radialen Ausdehnung vor der Dichtlippe enden.Piston according to claim 1 or 2, wherein the ribs (7) end with their radial extension in front of the sealing lip. Kolben nach einem der Ansprüche 1 bis 3, wobei mindestens die Rippen (7) mit Winkelabständen von maximal 30° beanstandet sind.Piston according to one of claims 1 to 3, wherein at least the ribs (7) are spaced apart by angular intervals of at most 30 °. Kolben nach Anspruch 4, wobei die Rippen (7) mit gegenseitigen Winkelabständen von 15 bis 20° angeordnet sind.Piston according to claim 4, wherein the ribs (7) are arranged at mutual angular distances of 15 to 20 °. Kolben nach einem der Ansprüche 1 bis 5, wobei die Dichtlippe (4) sich von einem Verbindungsansatz (3) der Mantelwand (2) aus nach vorne erstreckt, der sich etwa in der Mitte der axialen Kolbenlänge befindet.Piston according to one of claims 1 to 5, wherein the sealing lip (4) extends from a connecting projection (3) of the jacket wall (2) to the front, which extends approximately in the middle of the axial piston length. Kolben nach Anspruch 6, wobei die Dichtlippe (4) einen vom Verbindungsansatz (3) aus nach rückwärts weisenden Schenkel (5) aufweist und die Mantelwand (2) in ihrem hinteren Bereich radial erweitert ist.Piston according to claim 6, wherein the sealing lip (4) has a leg (5) pointing backwards from the connecting projection (3) and the jacket wall (2) is radially expanded in its rear region.
EP19000324.4A 2018-08-07 2019-07-05 Cartridge piston with centering aid Active EP3608029B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202018003641.2U DE202018003641U1 (en) 2018-08-07 2018-08-07 Cartridge piston equipped with centering aid

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EP3608029A1 true EP3608029A1 (en) 2020-02-12
EP3608029B1 EP3608029B1 (en) 2022-04-27

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EP19000324.4A Active EP3608029B1 (en) 2018-08-07 2019-07-05 Cartridge piston with centering aid

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EP (1) EP3608029B1 (en)
DE (1) DE202018003641U1 (en)
PL (1) PL3608029T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021108642A1 (en) * 2021-04-07 2022-10-13 Ritter Gmbh Trailing piston with supporting lip

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9110529U1 (en) * 1991-08-26 1991-10-10 Prestele, Eugen, 8900 Augsburg, De
US20110309111A1 (en) * 2010-06-22 2011-12-22 Fischbach Kg Kunststoff Technik Cartridge piston
DE102011100976A1 (en) * 2011-05-09 2012-11-15 Ritter Gmbh Locking and ejection pistons for plastic mass cartridges and method for inserting such a piston into a cartridge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9110529U1 (en) * 1991-08-26 1991-10-10 Prestele, Eugen, 8900 Augsburg, De
US20110309111A1 (en) * 2010-06-22 2011-12-22 Fischbach Kg Kunststoff Technik Cartridge piston
DE102011100976A1 (en) * 2011-05-09 2012-11-15 Ritter Gmbh Locking and ejection pistons for plastic mass cartridges and method for inserting such a piston into a cartridge

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PL3608029T3 (en) 2022-09-19
DE202018003641U1 (en) 2018-08-29
EP3608029B1 (en) 2022-04-27

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