EP1165400A1 - Cartridge piston - Google Patents

Cartridge piston

Info

Publication number
EP1165400A1
EP1165400A1 EP01901199A EP01901199A EP1165400A1 EP 1165400 A1 EP1165400 A1 EP 1165400A1 EP 01901199 A EP01901199 A EP 01901199A EP 01901199 A EP01901199 A EP 01901199A EP 1165400 A1 EP1165400 A1 EP 1165400A1
Authority
EP
European Patent Office
Prior art keywords
cartridge
piston
sealing lip
piston according
cover
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
EP01901199A
Other languages
German (de)
French (fr)
Other versions
EP1165400B1 (en
Inventor
Eugen Prestele
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.)
Sulzer Chemtech AG
Original Assignee
Sulzer Chemtech AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Sulzer Chemtech AG filed Critical Sulzer Chemtech AG
Publication of EP1165400A1 publication Critical patent/EP1165400A1/en
Application granted granted Critical
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Classifications

    • 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
    • B05C17/00553—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 with means allowing the stock of material to consist of at least two different components
    • B05C17/00559—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 with means allowing the stock of material to consist of at least two different components the different components being stored in coaxial chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
    • B05C17/00579—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container comprising means for allowing entrapped air to escape to the atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container

Definitions

  • the invention relates to a cartridge piston according to the preamble of claim 1.
  • Cartridge pistons are usually made of a soft plastic, for example LDPE, in order to achieve the required sealing effect towards the cartridge wall.
  • LDPE low density polyethylene
  • Cartridge pistons are only partially resistant to certain materials forming the contents of the cartridge and, moreover, are not sufficiently diffusion-tight.
  • the plastic LDPE is attacked by polyester resins and swells.
  • cover disc made of polyamide for example, is arranged on the top of the piston, since polyamide is resistant to the pre-naive materials and also diffusion-tight.
  • cover plates can be flat or profiled according to the cross-sectional shape of the piston surface. In both cases, such cover disks are sealing against the cartridge wall.
  • the known pistons have on their area facing the cartridge wall a cross-sectionally V-shaped annular groove, the outer edge of which is designed as a sealing lip. If the contents of the cartridge are pressed out of the cartridge by pressing the piston, the cartridge bulges. At the same time, however, the pressure acting on the contents of the cartridge causes the outer leg of the V-shaped groove and thus the sealing lip to be pressed against the cartridge wall.
  • the object is to design the cartridge piston in such a way that, on the one hand, the piston is protected from the influence of the cartridge content and, on the other hand, the sealing function of the piston is ensured even when the cartridge bulges.
  • Figure 1 shows a section through a piston for an egg component cartridge
  • Figure 2 shows a section through an annular piston for a coaxial cartridge according to a first embodiment
  • Figure 3 shows an edge section through the piston and the cover plate
  • FIG. 4a shows a section through an annular piston according to a second embodiment when it is introduced into a coaxial cartridge with a central inner tube;
  • Figure 4b shows a section through the ring piston of Figure 4a when inserted into a cartridge with an eccentric inner tube
  • FIG. 5a shows a section through an annular piston according to a third embodiment when it is introduced into a coaxial cartridge with a central inner tube and
  • FIG. 5b shows a section through the annular piston of FIG. 5a when it is introduced into a coaxial cartridge with an eccentric inner tube.
  • the piston 1 according to FIG. 1 consists, for example, of polyethylene, preferably of LDPE. On its upper side, this piston 1 has an annular groove 2 which is V-shaped in cross section. At the end of the outer leg 13 of the groove 2, a flexible sealing lip 3 is provided. The piston has a locking bore 4 in the center. Spacer knobs 6 are formed on the piston surface 5. In the area of the groove base 7, a circumferential locking projection 8 is integrally formed on the inside of the leg 13 of the groove 2 facing outwards.
  • the cover disk 9 has a locking pin 10 in the center, which is locked with the locking bore 4. Due to the spacer knobs 6, the cover 9 runs in slight distance from the piston surface 5.
  • the outer edge of the cover plate 9 is angled in an L-shape towards the groove base 7, the bend 11 having a circumferential locking lug 12 at its lower end.
  • the locking lug 12 is locked with the locking projection 8 in a liquid-tight and gas-tight manner.
  • the outer leg 13 with the sealing lip 3 is probably exposed to the contents of the cartridge, but this is not harmful since, due to the material, only widening can take place here.
  • the remaining areas of the piston 1 are in any case protected from the contents of the cartridge. If the cartridge wall bulges as a result of the pressure acting on the cartridge content, then at the same time this leg swings outwards as a result of the pressure acting on the inside of the leg 13, so that the sealing lip 3 is pressed against the inside wall of the cartridge.
  • the cover plate 9 can be provided with a plurality of bores 14.
  • a ventilation channel can be provided between the locking pin 10 and the locking bore 4. This ventilation duct is obtained if, for example, the locking bore has a cross-section deviating from the circular shape.
  • the air in the cartridge can thus flow out through a pressure on the piston 1 via the bores 14, the gap between the cover plate 9 and the piston surface 5 via the aforementioned ventilation channel.
  • FIG. 2 shows an annular piston for a coaxial cartridge.
  • the outer peripheral region 15 of the piston 1A is of the same design as described with reference to FIG. 1.
  • a circumferential V-shaped groove 20 is also provided, the inner leg 23 of which has a sealing lip 21 at its end.
  • the cover disk 9A also has a circumferential V-shaped groove 24 on its inner circumference, which, however, is arranged in mirror image to the groove 20 of the piston 1A.
  • the inner elastic leg 25 of the groove 24 ends in a sealing lip 26, which comes into contact with the inner wall of the outer cartridge chamber 27.
  • the piston has a locking pin 29 on which the cover plate 22 is clipped.
  • the piston For venting, the piston has a pocket 30 which is open at the bottom via a bore 31. A porous filter 32 is inserted into this pocket. The cartridge can thus be vented through the bores 14, the gap between the piston surface 5 and the cover plate 9A via the filter 32 and the bore 31.
  • the inner elastic leg 25 facilitates the insertion of the piston 1 A into the annular chamber 27 due to its inclined position.
  • FIG. 3 Another venting option that replaces the bores 14 is shown in FIG. 3.
  • the cover plate 9 has, along the inside of the pivot 11, vertically extending ventilation channels 33 which extend over the lower edge of the bend and over the circumferential locking lug 12. In this case, the air escapes via the channels 33, the gap between the piston surface 5 and the cover plate 9 or 9A and the ventilation channel or the filter.
  • annular piston 1A for a coaxial cartridge with an outer tube 34 and an inner tube 35 shown in FIGS. 4a and 4b there is a V-shaped annular groove 2 and a radially outer flexible sealing lip 3 for contacting the inner wall 36 on the outer peripheral region of the piston 1A of the outer tube 34 is provided.
  • the L-shaped outer edge of a cover plate 9A which is angled downward, is arranged as in the embodiment of FIG. 2 and is held there by a corresponding latching connection.
  • a circumferential V-shaped groove 20 with a radially inner sealing lip 21 on an inner leg 23 is also provided on the inner peripheral region of the annular piston 1A.
  • the inner sealing lip 21 is set back in relation to the outer sealing lip 3 in the axial direction by a few millimeters such that when inserting the annular piston 1A into the cartridge, the outer sealing lip 3 first comes to rest on the inner wall 36 of the outer tube 35 and the inner sealing lip 21 only touches the inner tube 35 when the annular piston 1A is inserted a few millimeters into the cartridge.
  • the forces for inserting the annular piston 1 A into the cartridge are considerably reduced compared to those designs in which the piston contacts the outer tube and the inner tube of the cartridge at the same time.
  • the cover disk 9A has on its inner circumference a region 37 which runs obliquely inwards over the radial groove and lies on the inner leg 23 and which ends in a circumferential sealing lip 38 for contact with the inner tube 35.
  • an insertion bevel for the inner tube 35 is formed. This has the advantage that the irine tube 35 is easily inserted into the central bore 39 of the annular piston 1A even in the case of an inclined position shown in FIG. 4b. It is therefore possible to dispense with complex precentering mechanisms, which are otherwise often required in order to insert the piston undamaged into the cartridge.
  • the central bore 39 of the annular piston 1A has a larger inner diameter than the previous embodiment.
  • This ring piston 1A is intended for a coaxial cartridge with a mixing ratio of 1: 1, while the piston shown in FIGS. 4a and 4b is designed for a mixing ratio of 10: 1.
  • the inner region 37 of the cover disk 9A also runs obliquely inwards and serves as an insertion slope for the inner tube 35 further support of the cover plate 9A protrudes into the radially inner groove 20 of the piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to a cartridge piston (1,1A) made of a material which is sensitive to the contents of the cartridge, comprising a covering disk (9, 9A)which is made of a material which is not sensitive to the contents of the cartridge and arranged on the surface (5) of the piston, having a structure which is adapted to one of the cross-sectional profiles (5) of the surface of said piston. The area of the piston (1,1A) facing the wall of the cartridge is embodied as a V-shaped cross-sectional annular groove (2) forming a sealing lip on the edge thereof. In order to protect the piston from the effects of the contents of the cartridge and to guarantee the sealing function of the piston even when the cartridge is curved, the outer diameter of the covering disk (9, 9A) is smaller than the edge of the piston (1,1A) which forms the sealing lip (3) and the edge of the covering disk (9,9A) is sealingly connected to the surface (5) of the piston.

Description

Kartuschenkolben cartridge plunger
Die Erfindung betrifft einen Kartuschenkolben nach dem Oberbegriff des Anspruches 1.The invention relates to a cartridge piston according to the preamble of claim 1.
Kartuschenkolben bestehen in der Regel aus einem weichen Kunststoff, zum Beispiel LDPE, um zur Kartuschenwand hin die erforderliche Abdichtwirkung zu erzielen. Solche Kunststoffe sind jedoch gegen bestimmte, den Kartuscheninhalt bildende Materialien nur bedingt resistent und außerdem nicht ausreichend diffusionsdicht. Beispielweise wird der Kunststoff LDPE durch Polyesterharze angegriffen und quillt auf.Cartridge pistons are usually made of a soft plastic, for example LDPE, in order to achieve the required sealing effect towards the cartridge wall. However, such plastics are only partially resistant to certain materials forming the contents of the cartridge and, moreover, are not sufficiently diffusion-tight. For example, the plastic LDPE is attacked by polyester resins and swells.
Um dies zu vermeiden, wird auf der Kolbenoberseite eine Abdeckscheibe zum Beispiel aus Polyamid angeordnet, da Polyamid gegenüber den vorgenaimten Materialien resistent und auch diffusionsdicht ist. Diese Abdeckscheiben können flach oder entsprechend der Querschnittsform der Kolbenoberfläche profiliert sein. In beiden Fällen liegen solche Abdeckscheiben abdichtend an der Kartuschenwand an.In order to avoid this, a cover disc made of polyamide, for example, is arranged on the top of the piston, since polyamide is resistant to the pre-naive materials and also diffusion-tight. These cover plates can be flat or profiled according to the cross-sectional shape of the piston surface. In both cases, such cover disks are sealing against the cartridge wall.
Die bekannten Kolben weisen an ihrem der Kartuschenwand zugewandten Bereich eine im Querschnitt V-förmige Ringnut auf, deren äußerer Rand als Dichtlippe ausgebildet ist. Wird der Kartuscheninhalt durch Druck auf den Kolben aus der Kartusche herausgepresst, dann beult sich die Kartusche auf. Gleichzeitig wird jedoch durch den auf den Kartuscheninhalt wirkenden Druck bewirkt, daß der äußere Schenkel der V-förmigen Nut und damit die Dichtlippe gegen die Kartuschenwand angepresst wird.The known pistons have on their area facing the cartridge wall a cross-sectionally V-shaped annular groove, the outer edge of which is designed as a sealing lip. If the contents of the cartridge are pressed out of the cartridge by pressing the piston, the cartridge bulges. At the same time, however, the pressure acting on the contents of the cartridge causes the outer leg of the V-shaped groove and thus the sealing lip to be pressed against the cartridge wall.
Dieser Effekt tritt jedoch nicht auf, wenn die Kolbenoberfläche durch eine Abdeckscheibe abgedeckt ist, die zur Kartuschenwand hin abdichtet. Bei einem Aufbeulen der Kartusche infolge des auf den Kartuscheninhalt wirkenden Drucks wird die Abdichtung zwischen der Kartuschenwand einerseits und den Dichtlippen der Abdeckscheibe und des Kolbens andererseits beeinträchtigt, so daß Kartuscheninhalt nach hinten über den Kolben austritt.However, this effect does not occur if the piston surface is covered by a cover disk which seals against the cartridge wall. If the cartridge bulges as a result of the pressure acting on the cartridge content, the seal between the cartridge wall on the one hand and the sealing lips of the cover plate and the piston on the other hand is impaired, so that the cartridge content escapes to the rear via the piston.
Es besteht die Aufgabe, den Kartuschenkolben so auszubilden, daß einerseits der Kolben vom Einfluß des Kartuscheninhalts geschützt ist und andererseits die Abdichtfunktion des Kolbens auch bei sich aufwölbender Kartusche gewährleistet ist. Gelöst wird diese Aufgabe mit den Merkmalen des Anspruches 1. Vorteilhafte Ausgestaltungen sind den Unteransprüchen entnehmbar.The object is to design the cartridge piston in such a way that, on the one hand, the piston is protected from the influence of the cartridge content and, on the other hand, the sealing function of the piston is ensured even when the cartridge bulges. This object is achieved with the features of claim 1. Advantageous refinements can be found in the subclaims.
Ausftthrungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnungen näher erläutert. Es zeigen:Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. Show it:
Figur 1 einen Schnitt durch einen Kolben für eine Eirikomponenten-Kartusche;Figure 1 shows a section through a piston for an egg component cartridge;
Figur 2 einen Schnitt durch einen Ringkolben für eine Coaxialkartusche gemäß einer ersten Ausfuhrungsform;Figure 2 shows a section through an annular piston for a coaxial cartridge according to a first embodiment;
Figur 3 einen randseitigen Schnitt durch den Kolben und die Abdeckscheibe;Figure 3 shows an edge section through the piston and the cover plate;
Figur 4a einen Schnitt durch einen Ringkolben gemäß einer zweiten Ausfühiτmgsform bei der Einführung in eine Coaxialkartusche mit zentrischem Innenrohr;FIG. 4a shows a section through an annular piston according to a second embodiment when it is introduced into a coaxial cartridge with a central inner tube;
Figur 4b einen Schnitt durch den Ringkolben von Figur 4a bei der Einführung in eine Kartusche mit außermittigem Innenrohr;Figure 4b shows a section through the ring piston of Figure 4a when inserted into a cartridge with an eccentric inner tube;
Figur 5a einen Schnitt durch einen Ringkolben gemäß einer dritten Ausflüirungsform bei der Eindϊührung in eine Coaxialkartusche mit zentrischem Innenrohr und5a shows a section through an annular piston according to a third embodiment when it is introduced into a coaxial cartridge with a central inner tube and
Figur 5b einen Schnitt durch den Ringkolben von Figur 5 a bei der Einführung in eine Coaxialkartusche mit außermittigem Innenrohr.5b shows a section through the annular piston of FIG. 5a when it is introduced into a coaxial cartridge with an eccentric inner tube.
Der Kolben 1 nach Figur 1 besteht beispielsweise aus Polyethylen, bevorzugt aus LDPE. Dieser Kolben 1 weist an seiner Oberseite randseitig eine im Querschnitt V-förmige Ringnut 2 auf. Am Ende des äußeren Schenkels 13 der Nut 2 ist eine flexible Dichtlippe 3 vorgesehen. Mittig weist der Kolben eine Rastbohrung 4 auf. An der Kolbenoberfläche 5 sind Distanznoppen 6 angeformt. Im Bereich des Nutengrunds 7 ist am nach außen weisenden Schenkel 13 der Nut 2 innenseitig ein umlaufender Rastvorsprung 8 angeformt.The piston 1 according to FIG. 1 consists, for example, of polyethylene, preferably of LDPE. On its upper side, this piston 1 has an annular groove 2 which is V-shaped in cross section. At the end of the outer leg 13 of the groove 2, a flexible sealing lip 3 is provided. The piston has a locking bore 4 in the center. Spacer knobs 6 are formed on the piston surface 5. In the area of the groove base 7, a circumferential locking projection 8 is integrally formed on the inside of the leg 13 of the groove 2 facing outwards.
Die Abdeckscheibe 9 weist mittig einen Rastzapfen 10 auf, der mit der Rastbohrung 4 verrastet ist. Bedingt durch die Distanznoppen 6 verläuft die Abdeckscheibe 9 in geringfügigem Abstand zur Kolbenoberfläche 5. Der äußere Rand der Abdeckscheibe 9 ist L- förmig zum Nutengrund 7 hin abgewinkelt, wobei die Abwinkelung 11 an ihrem unteren Ende eine umlaufende Rastnase 12 aufweist. Die Rastnase 12 ist mit dem Rastvorsprung 8 flüssigkeits- und gasdicht verrastet.The cover disk 9 has a locking pin 10 in the center, which is locked with the locking bore 4. Due to the spacer knobs 6, the cover 9 runs in slight distance from the piston surface 5. The outer edge of the cover plate 9 is angled in an L-shape towards the groove base 7, the bend 11 having a circumferential locking lug 12 at its lower end. The locking lug 12 is locked with the locking projection 8 in a liquid-tight and gas-tight manner.
Der äußere Schenkel 13 mit der Dichtlippe 3 ist wohl dem Kartuscheninhalt ausgesetzt, was jedoch nicht schädlich ist, da hier materialbedingt nur eine Aufweitung stattfinden kann. Die übrigen Bereiche des Kolbens 1 sind auf jeden Fall gegenüber dem Kartuscheninhalt geschützt. Beult sich die Kartuschenwand infolge des auf den Kartuscheninhalt wirkenden Drucks auf, dann schwenkt gleichzeitig infolge des auf die Innenseite des Schenkels 13 wirkenden Drucks dieser Schenkel nach außen, so daß die Dichtlippe 3 an die Kartuscheninnenwand angepresst wird.The outer leg 13 with the sealing lip 3 is probably exposed to the contents of the cartridge, but this is not harmful since, due to the material, only widening can take place here. The remaining areas of the piston 1 are in any case protected from the contents of the cartridge. If the cartridge wall bulges as a result of the pressure acting on the cartridge content, then at the same time this leg swings outwards as a result of the pressure acting on the inside of the leg 13, so that the sealing lip 3 is pressed against the inside wall of the cartridge.
Die Abdeckscheibe 9 kann mit mehreren Bohrungen 14 versehen sein. Zwischen dem Rastzapfen 10 und der Rastbohrung 4 kann ein Entlüftungskanal vorgesehen sein. Dieser Entlüftungskanal wird erhalten, wenn beispielsweise die Rastbohrung einen von der Kreisform abweichenden Querschnitt aufweist.The cover plate 9 can be provided with a plurality of bores 14. A ventilation channel can be provided between the locking pin 10 and the locking bore 4. This ventilation duct is obtained if, for example, the locking bore has a cross-section deviating from the circular shape.
Die in der Kartusche befindliche Luft kann somit bei einem Druck auf den Kolben 1 über die Bohrungen 14, den Spalt zwischen der Abdeckscheibe 9 und der Kolbenoberfläche 5 über den vorgenannten Entlüftungskanal abströmen.The air in the cartridge can thus flow out through a pressure on the piston 1 via the bores 14, the gap between the cover plate 9 and the piston surface 5 via the aforementioned ventilation channel.
Die Figur 2 zeigt einen Ringkolben für einen Coaxialkartusche. Der äußere Umfangsbereich 15 des Kolbens 1A ist gleich ausgebildet wie anhand der Figur 1 beschrieben.FIG. 2 shows an annular piston for a coaxial cartridge. The outer peripheral region 15 of the piston 1A is of the same design as described with reference to FIG. 1.
Im inneren Bereich des Kolbens 1A ist ebenfalls eine umlaufende V-förmige Nut 20 vorgesehen, deren innerer Schenkel 23 an seinem Ende eine Dichtlippe 21 aufweist. Die Abdeckscheibe 9A weist an ihrem Innenumfang ebenfalls einen umlaufende V-förmige Nut 24 auf, die jedoch spiegelbildlich zur Nut 20 des Kolbens 1A angeordnet ist. Der innere elastische Schenkel 25 der Nut 24 endet in einer Dichtlippe 26, die zur Anlage an die Innenwand der äußeren Kartuschenkammer 27 kommt.In the inner region of the piston 1A, a circumferential V-shaped groove 20 is also provided, the inner leg 23 of which has a sealing lip 21 at its end. The cover disk 9A also has a circumferential V-shaped groove 24 on its inner circumference, which, however, is arranged in mirror image to the groove 20 of the piston 1A. The inner elastic leg 25 of the groove 24 ends in a sealing lip 26, which comes into contact with the inner wall of the outer cartridge chamber 27.
Dies bedeutet, daß auch im inneren Umfangsbereich die Teile des Kolbens 1A nicht in Berührung kommen mit dem Kartuscheninhalt, was auch gewollt ist. Es wird hierdurch vermieden, daß der Schenkel 23 aufquellen kann und somit nicht mehr ausreichend gegen die Innenwand der Kammer 27 drückt. Andererseits ist beachtlich, daß diese Innenwand 28 zwischen der inneren Kartuschenkammer und der äußeren ringförmigen Kartuschenkarnmer 27 sich nicht verformt, wenn ein Druck auf den Karmscheninhalt dieser Kammern ausgeübt wird.This means that even in the inner circumferential area, the parts of the piston 1A do not come into contact with the cartridge contents, which is also wanted. It will avoided that the leg 23 can swell and thus no longer press sufficiently against the inner wall of the chamber 27. On the other hand, it is noteworthy that this inner wall 28 between the inner cartridge chamber and the outer annular cartridge chamber 27 does not deform when pressure is applied to the contents of the cartridge in these chambers.
Bei der Ausführungsform der Figur 2 weist der Kolben einen Rastzapfen 29 auf, auf welchem die Abdeckscheibe 22 aufgeklippt ist.In the embodiment of Figure 2, the piston has a locking pin 29 on which the cover plate 22 is clipped.
Zum Entlüften weist der Kolben eine Tasche 30 auf, die nach unten hin über eine Bohrung 31 offen ist. In diese Tasche ist ein poröses Filter 32 eingesetzt. Die Kartusche kann somit über die Bohrungen 14, den Spalt zwischen der Kolbenoberfläche 5 und der Abdeckscheibe 9A über das Filter 32 und die Bohrung 31 entlüftet werden.For venting, the piston has a pocket 30 which is open at the bottom via a bore 31. A porous filter 32 is inserted into this pocket. The cartridge can thus be vented through the bores 14, the gap between the piston surface 5 and the cover plate 9A via the filter 32 and the bore 31.
Der innere elastische Schenkel 25 erleichtert infolge seiner Schrägstellung das Einsetzen des Kolbens 1 A in die Ringkammer 27.The inner elastic leg 25 facilitates the insertion of the piston 1 A into the annular chamber 27 due to its inclined position.
Eine weitere Entlüftungsmöglichkeit, die die Bohrungen 14 ersetzt, ist in Figur 3 gezeigt. Die Abdeckscheibe 9 weist längs der Innenseite der Abwihkelung 11 vertikal verlaufende Entlüftungskanäle 33 auf, die sich über den unteren Rand der Abwinkelung und über die umlaufende Rastnase 12 erstrecken. In diesem Fall entweicht die Luft über die Kanäle 33, den Spalt zwischen der Kolbenoberfläche 5 und der Abdeckscheibe 9 bzw. 9A und den Entlüftungskanal bzw. das Filter.Another venting option that replaces the bores 14 is shown in FIG. 3. The cover plate 9 has, along the inside of the pivot 11, vertically extending ventilation channels 33 which extend over the lower edge of the bend and over the circumferential locking lug 12. In this case, the air escapes via the channels 33, the gap between the piston surface 5 and the cover plate 9 or 9A and the ventilation channel or the filter.
Auch bei der in Figur 4a und 4b dargestellten Ausführuiigsform eines Ringkolbens 1A für eine Coaxialkartusche mit einem Außenrohr 34 und einem Innenrohr 35 ist am äußeren Umfangsbereich des Kolbens 1A eine V-förmige Ringnut 2 und eine radial äußere flexible Dichtlippe 3 zur Anlage an der Innenwand 36 des Außenrohrs 34 vorgesehen. In der Ringnut 2 ist der L-förmig nach unten abgewinkelte äußere Rand einer Abdeckscheibe 9A wie bei der Ausführungsform von Figur 2 angeordnet und wird dort durch eine entsprechende Rastverbindung gehalten. Am inneren Umfangsbereich des Ringkolbens 1 A ist ebenfalls eine umlaufende V-förmige Nut 20 mit einer radial inneren Dichtlippe 21 an einem inneren Schenkel 23 vorgesehen. Bei dieser Ausführung ist jedoch die innere Dichtlippe 21 gegenüber der äußeren Dichtlippe 3 in Axialrichtung um einige Millimeter derart zurückversetzt, daß beim Einführen des Ringkolbens 1A in die Kartusche zunächst die äußere Dichtlippe 3 zur Anlage an der Innenwand 36 des Außenrohres 35 gelangt und die innere Dichtlippe 21 erst dann das Iimenrohr 35 berührt, wenn der Ringkolben 1A einige Millimeter in die Kartusche eingeschoben ist. Dadurch reduzieren sich die Kräfte für das Einsetzen des Ringkolbens 1 A in die Kartusche erheblich gegenüber denjenigen Ausführungen, bei denen der Kolben das Außenrohr und das Innenrohr der Kartusche gleichzeitig berührt.In the embodiment of an annular piston 1A for a coaxial cartridge with an outer tube 34 and an inner tube 35 shown in FIGS. 4a and 4b, there is a V-shaped annular groove 2 and a radially outer flexible sealing lip 3 for contacting the inner wall 36 on the outer peripheral region of the piston 1A of the outer tube 34 is provided. In the annular groove 2, the L-shaped outer edge of a cover plate 9A, which is angled downward, is arranged as in the embodiment of FIG. 2 and is held there by a corresponding latching connection. A circumferential V-shaped groove 20 with a radially inner sealing lip 21 on an inner leg 23 is also provided on the inner peripheral region of the annular piston 1A. In this embodiment, however, the inner sealing lip 21 is set back in relation to the outer sealing lip 3 in the axial direction by a few millimeters such that when inserting the annular piston 1A into the cartridge, the outer sealing lip 3 first comes to rest on the inner wall 36 of the outer tube 35 and the inner sealing lip 21 only touches the inner tube 35 when the annular piston 1A is inserted a few millimeters into the cartridge. As a result, the forces for inserting the annular piston 1 A into the cartridge are considerably reduced compared to those designs in which the piston contacts the outer tube and the inner tube of the cartridge at the same time.
Die Abdeckscheibe 9A weist an ihrem Innenumfang einen über die Radialnut schräg nach innen verlaufenden und auf dem inneren Schenkel 23 aufliegenden Bereich 37 auf, der in einer umlaufenden Dichtlippe 38 zur Anlage am Innenrohr 35 endet. Durch den schrägen inneren Bereich 37 der Abdeckscheibe 1 A wird eine Einführungsschräge für das Innenrohr 35 gebildet. Dadurch ergibt sich der Vorteil, daß das Irinenrohr 35 auch bei einer in Figur 4b dargestellten Schrägstellung problemlos in die zentrische Bohrung 39 des Ringkolbens 1A eingeführt wird. Es kann somit kann auf aufwendige Vorzentrierungsmechanismen verzichtet werden, die sonst vielfach erforderlich sind, um den Kolben unbeschädigt in die Kartusche einzuführen.The cover disk 9A has on its inner circumference a region 37 which runs obliquely inwards over the radial groove and lies on the inner leg 23 and which ends in a circumferential sealing lip 38 for contact with the inner tube 35. Through the inclined inner region 37 of the cover plate 1 A, an insertion bevel for the inner tube 35 is formed. This has the advantage that the irine tube 35 is easily inserted into the central bore 39 of the annular piston 1A even in the case of an inclined position shown in FIG. 4b. It is therefore possible to dispense with complex precentering mechanisms, which are otherwise often required in order to insert the piston undamaged into the cartridge.
Bei der in Figur 5a und 5b dargestellten Ausführungsform weist die zentrische Bohrung 39 des Ringkolbens 1A einen im Vergleich zu der vorhergehenden Ausführung größeren Innendurchmesser auf. Dieser Ringkolben 1A ist für eine Coaxialkartusche mit einem Mischungsverhältnis von 1:1 bestimmt, während der in Figur 4a und 4b dargestellte Kolben für ein Mischungsverhälnis von 10:1 konzipiert ist. Auch bei der Ausführung gemäß Figur 5a und 5b verläuft der innere Bereich 37 der Abdeckscheibe 9A schräg nach innen und dient als Einführungschräge für das Innenrohr 35. Bei dieser Ausführung ist an der Unterseite der Abdeckscheibe 9A allerdings noch ein zusätzlicher umlaufender Steg 40 vorgesehen, der zur weiteren Abstütztung der Abdeckscheibe 9A in die radial innere Nut 20 des Kolbens ragt. In the embodiment shown in FIGS. 5a and 5b, the central bore 39 of the annular piston 1A has a larger inner diameter than the previous embodiment. This ring piston 1A is intended for a coaxial cartridge with a mixing ratio of 1: 1, while the piston shown in FIGS. 4a and 4b is designed for a mixing ratio of 10: 1. In the embodiment according to FIGS. 5a and 5b, the inner region 37 of the cover disk 9A also runs obliquely inwards and serves as an insertion slope for the inner tube 35 further support of the cover plate 9A protrudes into the radially inner groove 20 of the piston.

Claims

Ansprüche Expectations
1. Kartuschenkolben (1, 1A) aus einem gegenüber dem Kartuschemnhalt empfindlichen Material, mit einer Abdeckscheibe (9, 9A) aus einem gegenüber dem Kartuschemnhalt unempfindlichen Material, die auf der Kolbenoberfläche (5) angeordnet ist und eine der Querschnittsformen der Kolbenoberfläche (5) angepaßte Struktur aufweist, wobei der der Wand der Kartusche zugewandte Bereich des Kolbens (1, 1A) im Querschnitt als V- förmige Ringnut (2) ausgebildet ist, die an ihrem Rand eine Dichtlippe (3) bildet, dadurch gekennzeichnet, daß der Außendurchmesser der Abdeckscheibe (9, 9A) kleiner ist als der die Dichtlippe (3) bildende Rand des Kolbens (1, 1A) und der Rand der Abdeckscheibe (9, 9A) abdichtend mit der Kolbenoberfläche (5) verbunden ist.1. cartridge plunger (1, 1A) made of a material sensitive to the cartridge contents, with a cover disk (9, 9A) made of a material insensitive to the cartridge contents, which is arranged on the piston surface (5) and one of the cross-sectional shapes of the piston surface (5) Has adapted structure, the region of the piston (1, 1A) facing the wall of the cartridge being designed in cross section as a V-shaped annular groove (2) which forms a sealing lip (3) at its edge, characterized in that the outer diameter of the Cover disc (9, 9A) is smaller than the edge of the piston (1, 1A) forming the sealing lip (3) and the edge of the cover disc (9, 9A) is sealingly connected to the piston surface (5).
2. Kartuschenkolben nach Anspruch 1, dadurch gekennzeichnet, daß die Abdeckscheibe (9, 9A) zum Nutengrund (7) hin abgewinkelt ist.2. Cartridge piston according to claim 1, characterized in that the cover plate (9, 9A) is angled towards the groove base (7).
3. Kartuschenkolben nach Anspruch 2, dadurch gekennzeichnet, daß das freie Ende der Abwinkelung (11) der Abdeckscheibe (9, 9A) mit dem Nutengrund (7) verrastet ist.3. Cartridge piston according to claim 2, characterized in that the free end of the bend (11) of the cover plate (9, 9A) with the groove base (7) is locked.
4. Kartuschenkolben nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Abdeckscheibe (9, 9A) und der Kolben (1, 1A) über mindestens einen Rastzapfen (10, 29) und eine Rastbohrung (4) miteinander verrastet sind.4. Cartridge piston according to one of claims 1 to 3, characterized in that the cover plate (9, 9A) and the piston (1, 1A) via at least one locking pin (10, 29) and a locking bore (4) are locked together.
5. Kartuschenkolben nach Anspruch 4, dadurch gekennzeichnet, daß der Rastzapfen (10) am Abdeckteil (9) und die Rastbohrung (4) am Kolben (1) angeordnet sind, zwischen Rastzapfen (10) und Rastbohrung (4) ein Entlüftungskanal gebildet wird und das Abdeckteil (9) mindestens eine Bohrung (14) geringen Durchmessers aufweist, die mit dem Entlüftungskanal kommuniziert.5. Cartridge piston according to claim 4, characterized in that the locking pin (10) on the cover part (9) and the locking hole (4) on the piston (1) are arranged, between the locking pin (10) and locking hole (4) a ventilation channel is formed and the cover part (9) has at least one bore (14) of small diameter, which communicates with the ventilation duct.
6. Kartuschenkolben nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Abdeckteil (9A) mindestens eine Bohrung (14) aufweist, am Kolben (1A) eine zur Umgebung hin offene Tasche (30) angeordnet ist, in der ein poröses Filter (32) angeordnet ist und die Bohrung (14) mit der Tasche (30) kommurriziert. 6. Cartridge piston according to one of claims 1 to 3, characterized in that the cover part (9A) has at least one bore (14), on the piston (1A) an open to the environment pocket (30) is arranged in which a porous filter (32) is arranged and the bore (14) with the pocket (30) commurized.
7. Kartuschenkolben nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß anstelle der Bohrung (14) längs der Innenseite der Abwinkelung (11), über den unteren Rand dieser Abwinkelung (11) und über die Rastnase (12) hinweg Entlüftungskanäle (33) verlaufen.7. Cartridge piston according to claim 5 or 6, characterized in that instead of the bore (14) along the inside of the bend (11), over the lower edge of this bend (11) and over the locking lug (12) vent channels (33) ,
8. Kartuschenkolben nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß auf der Kolbenoberfläche (5) Distanznoppen (6) angeformt sind, gegen die die Abdeckscheibe (9, 9A) anliegt.8. Cartridge piston according to claim 5 or 6, characterized in that on the piston surface (5) spacer knobs (6) are formed against which the cover plate (9, 9A) abuts.
9. Kartuschenkolben nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß er als Ringkolben (1A) für eine Coaxialkartusche ausgebildet ist und eine radial innere Dichtlippe (21) zur Anlage an einem Innenrohr (35) und eine radial äußere Dichtlippe (3) zur Anlage an einem Außenrohrs (34) der Coaxialkartusche aufweist.9. Cartridge piston according to one of claims 1 to 8, characterized in that it is designed as an annular piston (1A) for a coaxial cartridge and a radially inner sealing lip (21) for contact with an inner tube (35) and a radially outer sealing lip (3) for contacting an outer tube (34) of the coaxial cartridge.
10. Kartuschenkolben nach Anspruch 9, dadurch gekennzeichnet, daß die radial innere Dichtlippe (21) gegenüber der radial äußeren Dichtlippe (3) in Axialrichtung zurückversetzt ist.10. Cartridge piston according to claim 9, characterized in that the radially inner sealing lip (21) is set back in the axial direction with respect to the radially outer sealing lip (3).
11. Kartuschenkolben nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß die11. Cartridge piston according to claim 9 or 10, characterized in that the
Abdeckscheibe (9A) zur abdichtenden Anlage an dem Innenrohr (35) der Coaxialkartusche ausgebildet ist.Cover disc (9A) is formed for sealing contact with the inner tube (35) of the coaxial cartridge.
12. Kartuschenkolben nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, daß der dem Innenrohr (35) zugewandte Bereich (37) der Abdeckscheibe (9A) schräg nach innen verläuft.12. Cartridge piston according to one of claims 9 to 11, characterized in that the region (37) of the cover disk (9A) which faces the inner tube (35) extends obliquely inwards.
13. Kartuschenkolben nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß der Ringkolben (1A) am inneren Umfangsbereich eine umlaufende V-förmige innere Nut (20) mit einem inneren Schenkel (23) aufweist, an dem die radial innere Dichtlippe (21) vorgesehen ist.13. Cartridge piston according to one of claims 9 to 12, characterized in that the annular piston (1A) on the inner peripheral region has a circumferential V-shaped inner groove (20) with an inner leg (23) on which the radially inner sealing lip (21 ) is provided.
14. Kartuschenkolben nach Anspruch 13, dadurch gekennzeichnet, daß die Abdeckscheibe (9A) einen in die innere Nut (20) ragenden umlaufenden Steg (40) an ihrer Unterseite aufweist. 14. Cartridge piston according to claim 13, characterized in that the cover plate (9A) has an in the inner groove (20) projecting peripheral web (40) on its underside.
EP01901199A 2000-01-28 2001-01-24 Cartridge piston Expired - Lifetime EP1165400B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20001438U 2000-01-28
DE20001438U DE20001438U1 (en) 2000-01-28 2000-01-28 Cartridge piston
PCT/EP2001/000751 WO2001055006A1 (en) 2000-01-28 2001-01-24 Cartridge piston

Publications (2)

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EP1165400A1 true EP1165400A1 (en) 2002-01-02
EP1165400B1 EP1165400B1 (en) 2003-01-02

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ID=7936477

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EP01901199A Expired - Lifetime EP1165400B1 (en) 2000-01-28 2001-01-24 Cartridge piston

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US (1) US6494348B2 (en)
EP (1) EP1165400B1 (en)
DE (2) DE20001438U1 (en)
WO (1) WO2001055006A1 (en)

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Also Published As

Publication number Publication date
DE50100076D1 (en) 2003-02-06
US20020153391A1 (en) 2002-10-24
US6494348B2 (en) 2002-12-17
EP1165400B1 (en) 2003-01-02
DE20001438U1 (en) 2001-06-13
WO2001055006A1 (en) 2001-08-02
DE50100076C5 (en) 2007-10-11

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