EP1885508B1 - Compressed-air gun - Google Patents

Compressed-air gun Download PDF

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Publication number
EP1885508B1
EP1885508B1 EP06753637A EP06753637A EP1885508B1 EP 1885508 B1 EP1885508 B1 EP 1885508B1 EP 06753637 A EP06753637 A EP 06753637A EP 06753637 A EP06753637 A EP 06753637A EP 1885508 B1 EP1885508 B1 EP 1885508B1
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EP
European Patent Office
Prior art keywords
cartridge
piston
compressed
receiving space
pressure
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EP06753637A
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German (de)
French (fr)
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EP1885508A1 (en
Inventor
Thomas Salomon
Hermann LÜKEWILLE
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Tecalemit GmbH and Co KG
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Horn GmbH and Co KG
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Publication of EP1885508A1 publication Critical patent/EP1885508A1/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
    • B05C17/015—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 pneumatically or hydraulically actuated piston or the like

Definitions

  • the invention relates to a compressed air gun for ejecting pasty to viscous material, having the features of the preamble of claim 1. It is a hand-held device, especially for workshop use.
  • Compressed air guns of the type in question have long been known.
  • a pasty material in this sense, for example, a sealant as it finds use in motor vehicle crafts.
  • a pasty material may also be a processed in the construction industry sealant, a lubricating grease, a surface coating o. The like. Be.
  • Characteristic of a compressed air gun of the type in question is first that the processed, pasty to low-viscosity material is in a cartridge that can be inserted or used as stored goods in the openable outer housing of the compressed air gun.
  • the cartridge to be used usually has an outlet tip or another outlet device on a front end side. At the opposite end face is located in the cylinder jacket forming sleeve of the cartridge a cartridge piston. This is in the cylinder jacket of the cartridge in the direction of the exit tip o. The like. Advance. To achieve this, a pressurization takes place from a compressed air connection.
  • the compressed air connection itself is connected, for example, to the compressed air network of a gas station or motor vehicle repair workshop. A usual network pressure is there at some bar.
  • the known compressed air gun for ejecting pasty to thin-liquid material, from which the invention proceeds has a cartridge inserted pressure-tightly closed receiving space into which the compressed-air connection opens ( US-A-4,174,068 ).
  • the outer housing is connected to a handle and the compressed air connection is connected via a arranged in the handle valve assembly with an external, also located on the handle compressed air inlet (compressed air connection to a compressed air network).
  • the valve assembly can be actuated and the in operation Compressed air inlet permanently transmitted network pressure of the compressed air network unimpeded or reduced transferred into the receiving space of the outer housing.
  • the pressurization of the receiving space causes the cartridge piston in the cartridge to be advanced towards the exit tip, thus expelling the material in the cartridge from the exit tip.
  • a secondary compressed air space is still provided, which allows a compressed air admixture to already leaked from the exit tip material via a secondary air nozzle.
  • a similar construction is also known from other prior art ( DE-A-41 37 801 ). For these aspects reference may be made to the cited references.
  • the pressure in the receiving space acts directly on the cartridge piston.
  • the cartridge piston itself is the element which seals the receiving space with respect to the interior of the cartridge with the pasty or viscous material therein. At higher pressure in the receiving space, it may happen that the cartridge piston shows a leak. The compressed air entering the material affects the uniformity of the ejection of this material. This can lead to application damage.
  • This intermediate piston can also be designed as a telescopic piston ( DE-A-41 37 801 ).
  • the effective area on which the pressure acts in the receiving space of the outer housing about the size of the surface of the cartridge piston itself.
  • the intermediate piston is regularly only slightly larger than the cartridge piston.
  • the output pressure that can be generated at the cartridge piston is systematically limited.
  • the normal compressed air network usually only supplies a pressure of a few bar at the place of use.
  • an upper pressure limit also results from the tightness requirements.
  • a compressed air gun of the type in question has finally also for safety reasons (burst protection) to adhere to strict limits on the working pressure.
  • a machine printing press for high viscosity grease ( US-A-3,057,521 ), in which on the outer housing, an additional compressed air cylinder is provided with a small movable positioning piston displaceable therein sealed.
  • the cartridge is pressed on its end wall of the outer housing facing surface against an inwardly offset circumferential sealing ring to provide a seal here before the receiving space of the outer housing is pressurized.
  • the teaching of the present invention is based on the problem in a compressed air gun of the type in question effective on the cartridge To increase discharge pressure without significantly increasing the working pressure of the compressed air gun itself.
  • the additional thrust piston in the compressed air cylinder outside the actual working space with the primary driven cartridge piston, so to speak connects an additional drive in series, which likewise acts on the cartridge piston.
  • the discharge pressure generated in the cartridge is substantially increased, for example doubled, at the same working pressure. Even pasty materials with high relative viscosity can then be processed quickly from the cartridge.
  • the thrust piston is not always, but only optionally pressurized.
  • Another way of controlling the cartridge piston and thrust piston is to permanently connect the thrust chamber pneumatically with the receiving space.
  • This connection can be realized in principle in the wall of the outer housing or via lines outside the outer housing.
  • the thrust chamber is pneumatically connected via a pressure line which extends in the power transmission element itself, with the receiving space. In particular, it may therefore be a more or less centrally located channel in the piston rod.
  • the handle of the pneumatic gun may be permanently connected to or integrally molded with the outer housing.
  • the handle can also be removed from the outer housing, be it for transport purposes or for the purpose of attaching the compressed air gun to another holder.
  • a compressed air gun is used to eject pasty to viscous material from an exit tip of a disposable material package.
  • This material may be viscous adhesives, sealants, lubricants, fillers, or the like. It is essential that the ejection of pasty to viscous material by means of compressed air from a compressed air network or from another source of compressed air.
  • the illustrated compressed air gun initially has an outer housing 1 which can be opened on at least one side.
  • the outer housing 1 is configured substantially cylindrical in the illustrated embodiment and can be opened on a front end wall 2.
  • the end wall 2 is designed here as a screw-on end wall cover, for example. However, there are also outer cases that can be opened laterally.
  • a pressure-tight receiving space 3 for a cartridge containing the material to be ejected 4 is formed in the outer housing 1.
  • a handle 5 is connected on the outer housing 1 .
  • a compressed air connection 6 for the receiving space.
  • Fig. 1 the cartridge 6 to be used is inserted in the receiving space 3 of the outer housing 1.
  • This cartridge 4 has an outlet end 8 on a front end 7.
  • the exit tip consists of an outlet nozzle directly on the end face 7 of the cartridge 4 and a plastic tip plugged there.
  • outlet nozzle which are connected to another conveyor.
  • the cartridge 4 On the opposite end face 9, the cartridge 4 has a cartridge piston 10. This is in the cartridge 4, namely in the cylinder jacket 11 of the cartridge 4, sliding in the direction of the exit tip 8 vorschiebbar, so that from the exit tip 8, the material contained in the cartridge 4 is ejected. This is done with inserted cartridge 4 by pressurizing the receiving space 3.
  • the receiving space 3 is sealed at the end wall 2 of the outer housing 1 passing through the exit tip 8, through an annular seal 12, at the front end side 7 of the cartridge 4 below axial pressure sealingly applied. This is one of the sealing options at this point.
  • a radial seal is provided instead of an axial seal ( US-A-4,174,068 ).
  • an additional compressed air cylinder 13 is arranged with a slidingly displaceable therein piston 14, that the thrust piston 14 in the air cylinder 13 facing away from the receiving space 3 Side forms a connected to the compressed air connection 6 or connectable thrust chamber 15, and that the thrust piston 14 on the cartridge 4 side facing a power transmission element 16, in particular in the form of a piston rod, which enters via a pressure-tight passage 17 into the receiving space 3 and at Inserted cartridge 4 on the cartridge piston 10 is force-transmitting to the plant.
  • the feed force on the cartridge piston 10 can be increased so that not only the receiving space 3, but also the thrust chamber 15 can be acted upon with increased pressure, wherein on the thrust chamber 15 opposite side of the thrust piston 14, a lower pressure, in particular ambient pressure prevails.
  • the compressed air cylinder 13 is here provided with an air exchange opening 18.
  • the data P 0 and P 1 are the pressure of the surrounding atmosphere and the network pressure in most cases from the compressed air connection 6.
  • the pressure difference is a few bar.
  • the in Fig. 1 Plotted arrows show the flow path of the compressed air when pressurized and the direction of action of the pressure with respect to the individual pistons 10; 14th
  • the illustrated and preferred embodiment shows that the thrust piston 14 on the opposite side of the thrust chamber 15 in the air cylinder 13 a freewheeling chamber 19 is formed, which communicates via at least one air exchange opening 18 with the ambient atmosphere.
  • the freewheeling chamber 19 is thus movement space for the thrust piston 14, without having its own pneumatic function. Overall, this ensures a closed to the outside, compact design.
  • the illustrated and preferred embodiment shows, moreover, that the surface formed by the thrust piston 14 is greater than the area formed by the cartridge piston 10.
  • FIG. 1 illustrated embodiment shows a particularly interesting and preferred embodiment of a compressed air gun according to the invention.
  • the construction is made such that the pressure in the receiving space 3 acts directly on the cartridge piston 10 and yet a power transmission from the power transmission element 16 is ensured on the cartridge piston 10.
  • the force transmission element 16 comes to rest, leaving at least a substantial part of the area of the cartridge piston 10 free.
  • Through openings in the ejector 20 allow the compressed air in the receiving space 3 acts directly on the surface of the cartridge piston 10.
  • Fig. 3 shows a variant thereto, which is characterized in that the force transmission element 16 comes to cover under cover at least a substantial part of the surface of the cartridge piston 10 at this.
  • the squeezer 20 iw over the entire surface of the cartridge piston 10 and transmits the force itself to the cartridge piston 10. This force results on the one hand from the pressure in the receiving space 3, on the other hand from the transferred via the power transmission element 16 pressure on the thrust piston 14 in the thrust chamber 15th
  • the illustrated embodiment shows in any of the variants, a possibility that provides the power transmission element 16 with the squeezer 20. Namely, it can be provided that the power transmission element 16 at the cartridge piston 10 associated end is guided sealed even in the cylinder jacket 11 of the cartridge 4. This can be realized, for example, by a sealed guide of the ejector 20 in the cylinder jacket 11. This additional measure prevents the illustrated in the general part of the description leak on the cartridge piston 10 shows.
  • the illustrated embodiment also does not show in any of the variants a possibility that has already been mentioned in the prior art. It would then be possible for the force transmission element at the end associated with the cartridge piston to come into abutment against a piston which is guided in a sealed manner in the receiving space and advances the cartridge piston, possibly embodied as a telescopic piston. In that regard, reference may be made to the cited prior art.
  • Fig. 1 the compressed air connection 6 is shown as if it were not controllable. Normally, however, this will be solved differently. Normally, it will be provided that the compressed-air connection 6 is connected to an external compressed-air inlet 22 via a valve arrangement 21, which is preferably arranged in the handle 5 ( Fig. 2 ).
  • the valve assembly 21 is actuated regularly via a manual lever or a corresponding button 23.
  • the valve assembly 21 may also include pressure reducer, safety valves o. The like., which may also be adjustable. Reference may also be made to the introductory section of the prior art ( DE-A-41 37 801 ).
  • Fig. 2 shows a modified embodiment, for which it holds that the thrust chamber 15 is connected separately from the receiving space 3 to the compressed air connection 6 and to the valve assembly 21.
  • the thrust piston 14 is only connected in terms of drive technology when a material is actually processed whose consistency or its required or desired operating speed requires a higher ejection pressure in the cartridge 4.
  • the thrust chamber 15 is selectively connectable to the working pressure, possibly to a reduced pressure, or to the ambient atmosphere.
  • FIG. 1 and in Fig. 3 illustrated embodiment has a construction which represents a preferred variant.
  • the thrust chamber 15 is pneumatically connected to the receiving space 3.
  • the illustrated and preferred embodiment is characterized in this respect by a particularly expedient construction, which is namely characterized in that the thrust chamber 15 is pneumatically connected via a pressure line 24 in the power transmission element 16, here in the piston rod, with the receiving space 3.
  • a particularly elegant solution When in Fig. 1 illustrated embodiment is the entry into the pressure line 24 at the bottom of the ejector 20, because the squeezer 20 itself is slightly spaced from the cartridge piston 10.
  • a lateral inlet opening for the pressure line 24 is provided in the force transmission element 16 forming piston rod.
  • the handle 5 is removable from the outer housing 1. This is a measure known from the prior art, which makes it possible to use alternative drive systems. This is a kind of modular system realized.
  • the outer housing 1 is cylindrical and can be opened on the end wall 2. It has already been pointed out that the end wall 2 can be designed as a screw-on lid, for example.
  • the jacket of the air cylinder 13 is made in one piece with the jacket of the outer housing 1.
  • the jacket could be designed as a one-piece molded plastic molding. This would have in the middle wall, which forms the rear end wall of the outer housing 1, the bushing 17 and would each be sealingly closed at the end walls by appropriate cover.
  • the illustrated and preferred embodiment further shows a particular, albeit known construction ( DE-A-196 32 717 ), which serves to equalize the pressure on the cylinder jacket 11 of the cartridge 4.
  • a pressure equalization By such a pressure equalization, the cartridge 4 with a thinner cylinder jacket 11 or a cylinder jacket 11 made of a less resistant material, possibly even made of cardboard, are executed. Regardless, you can go inside the cartridge 4 generate a high pressure, which does not lead to bursting of the cartridge 4.
  • an annular space 26 remains in which the pressure prevails in the receiving space 3. If the intermediate piston described above as a variant is provided, then one must make a corresponding detour line for this pressure equalization.
  • FIG. 1 Another interesting construction is in the recording room 3 of the Fig. 1 realized compressed air gun realized.
  • a support 27 for the rear end face 9 of the inserted cartridge 4 in particular in the form of a rib-shaped or perforated support sleeve, is provided in the receiving space 3 at the end wall 2 opposite end.
  • the cartridge 4 can be properly positioned and clamped with respect to the front end wall 2 of the outer housing 1, so that the axial seal 12 is on the end wall 2 under the necessary sealing pressure to achieve the working pressure in the receiving space 3 can defined.

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Abstract

The invention relates to a compressed-air gun for ejecting pasty to highly viscous material, comprising an outer housing (1) which can be opened on at least one side and has a pressure-tight locating space (3) for a cartridge (4) containing the material, preferably comprising a handle (5) connected to the outer housing (1), comprising a compressed-air connection (6) for the locating space (3), the cartridge (4) to be used having a discharge tip (8) or the like at a front end face (7) and a cartridge piston (10) at the opposite end face (9), the locating space (3), when the cartridge (4) is inserted, also being sealed off at the discharge tip (8) passing through the end wall (2) of the outer housing (1), and it being possible, by pressurizing the locating space (3), for the cartridge piston (10) to be advanced in the cartridge (4) in the direction of the discharge tip (8), so that the material is ejected from the discharge tip (8). Provision is made for an additional compressed-air cylinder (13) having a thrust piston (14) displaceable therein in a sealed-off manner to be arranged on the outer housing (1), for the thrust piston (14) to form a thrust chamber (15) in the compressed-air cylinder (13) on the side remote from the locating space (3), which thrust chamber (15) is connected to or can be connected to the compressed-air connection (6), for the thrust piston (14), on the side facing the cartridge (4), to have a force-transmission element (16), in particular in the form of a piston rod, which enters the locating space (3) via a pressure-tight leadthrough (17) and, when the cartridge (4) is inserted, comes to bear against the cartridge piston (10) in a force-transmitting manner, and for the feed force at the cartridge piston (10) to be capable of being increased by virtue of the fact that increased pressure can be applied not only to the locating space (3) but also to the thrust chamber (15), a lower pressure, in particular ambient pressure, prevailing on the side of the thrust piston (14) opposite the thrust chamber (15).

Description

Die Erfindung betrifft eine Druckluftpistole zum Ausstoßen von pastösem bis dünnflüssigem Material, mit den Merkmalen des Oberbegriffs von Anspruch 1. Es handelt sich um ein Handgerät, insbesondere für den Werkstattgebrauch.The invention relates to a compressed air gun for ejecting pasty to viscous material, having the features of the preamble of claim 1. It is a hand-held device, especially for workshop use.

Druckluftpistolen der in Rede stehenden Art sind seit langem bekannt. Ein pastöses Material in diesem Sinne ist beispielsweise eine Dichtmasse wie sie im Kraftfahrzeug-Handwerk Verwendung findet. Ein pastöses Material kann aber auch eine im Baugewerbe verarbeitete Dichtmasse, ein Abschmierfett, eine Flächenbeschichtung o. dgl. sein. Es gibt auch eher dünnflüssige Material, das in einer solchen Druckluftpistole verarbeitet wird.Compressed air guns of the type in question have long been known. A pasty material in this sense, for example, a sealant as it finds use in motor vehicle crafts. But a pasty material may also be a processed in the construction industry sealant, a lubricating grease, a surface coating o. The like. Be. There is also rather fluid material that is processed in such a compressed air gun.

Charakteristisch für eine Druckluftpistole der in Rede stehenden Art ist zunächst, daß sich das zu verarbeitende, pastöse bis dünnflüssige Material in einer Kartusche befindet, die als Lagerware vorhanden in das dazu öffenbare Außengehäuse der Druckluftpistole eingelegt oder eingesetzt werden kann. Die zu verwendende Kartusche weist an einer vorderen Stirnseite üblicherweise eine Austrittsspitze oder eine anderweitige Austrittseinrichtung auf. An der gegenüberliegenden Stirnseite befindet sich in der den Zylindermantel bildenden Hülse der Kartusche ein Kartuschenkolben. Dieser ist in dem Zylindermantel der Kartusche in Richtung der Austrittsspitze o. dgl. vorschiebbar. Um das zu erreichen erfolgt eine Druckbeaufschlagung von einem Druckluftanschluß her. Der Druckluftanschluß selbst ist beispielsweise an das Druckluftnetz einer Tankstelle oder Kraftfahrzeug-Reparaturwerkstatt angeschlossen. Ein üblicher Netzdruck liegt dort bei einigen Bar.Characteristic of a compressed air gun of the type in question is first that the processed, pasty to low-viscosity material is in a cartridge that can be inserted or used as stored goods in the openable outer housing of the compressed air gun. The cartridge to be used usually has an outlet tip or another outlet device on a front end side. At the opposite end face is located in the cylinder jacket forming sleeve of the cartridge a cartridge piston. This is in the cylinder jacket of the cartridge in the direction of the exit tip o. The like. Advance. To achieve this, a pressurization takes place from a compressed air connection. The compressed air connection itself is connected, for example, to the compressed air network of a gas station or motor vehicle repair workshop. A usual network pressure is there at some bar.

Die bekannte Druckluftpistole zum Ausstoßen von pastösem bis dünnflüssigem Material, von der die Erfindung ausgeht, hat einen bei eingesetzter Kartusche druckdicht abgeschlossenen Aufnahmeraum, in den der Druckluftanschluß mündet ( US-A-4,174,068 ). Das Außengehäuse ist mit einem Handgriff verbunden und der Druckluftanschluß ist über eine im Handgriff angeordnete Ventilanordnung mit einem externen, ebenfalls am Handgriff befindlichen Drucklufteintritt (Druckluftanschluß an ein Druckluftnetz) verbunden. Mittels eines Handbetätigungshebels läßt sich die Ventilanordnung betätigen und der im Betrieb am Drucklufteintritt dauernd anstehende Netzdruck des Druckluftnetzes ungemindert oder gemindert in den Aufnahmeraum des Außengehäuses übertragen. Die Druckbeaufschlagung des Aufnahmeraums führt dazu, daß der Kartuschenkolben in der Kartusche in Richtung der Austrittsspitze vorgeschoben und so das Material in der Kartusche aus der Austrittsspitze ausgestoßen wird.The known compressed air gun for ejecting pasty to thin-liquid material, from which the invention proceeds, has a cartridge inserted pressure-tightly closed receiving space into which the compressed-air connection opens ( US-A-4,174,068 ). The outer housing is connected to a handle and the compressed air connection is connected via a arranged in the handle valve assembly with an external, also located on the handle compressed air inlet (compressed air connection to a compressed air network). By means of a manual lever, the valve assembly can be actuated and the in operation Compressed air inlet permanently transmitted network pressure of the compressed air network unimpeded or reduced transferred into the receiving space of the outer housing. The pressurization of the receiving space causes the cartridge piston in the cartridge to be advanced towards the exit tip, thus expelling the material in the cartridge from the exit tip.

Die bekannte, zuvor erläuterte Druckluftpistole, von der die Erfindung ausgeht, zeichnet sich bereits durch zwei Besonderheiten aus.The known, previously explained compressed air gun, from which the invention proceeds, is already characterized by two peculiarities.

Zum einen ist zusätzlich zum primären Druckluftraum im Aufnahmeraum am Kartuschenkolben noch ein sekundärer Druckluftraum vorgesehen, der über eine Sekundärluftdüse eine Druckluft-Beimischung zum schon aus der Austrittsspitze ausgetretenen Material ermöglicht. Eine ähnliche Konstruktion ist auch aus anderem Stand der Technik bekannt ( DE-A-41 37 801 ). Für diese Aspekte darf auf die genannten Entgegenhaltungen verwiesen werden.On the one hand, in addition to the primary compressed air space in the receiving space on the cartridge piston, a secondary compressed air space is still provided, which allows a compressed air admixture to already leaked from the exit tip material via a secondary air nozzle. A similar construction is also known from other prior art ( DE-A-41 37 801 ). For these aspects reference may be made to the cited references.

Zum anderen kann mit einer Kartusche gearbeitet werden, deren Zylindermantel vergleichsweise dünn und wenig belastbar ist. Das hat seinen Grund darin, daß bei eingesetzter Kartusche zwischen der Kartusche und dem Mantel des Außengehäuses eine Ringraum verbleibt, der bei Druckbeaufschlagung des Aufnahmeraums ebenfalls mit Druck beaufschlagt ist. Es findet somit eine Art Druckkompensation innen/außen bezüglich der Kartusche statt. Die Kartusche ist weniger berstgefährdet.On the other hand, it is possible to work with a cartridge whose cylinder jacket is comparatively thin and less resilient. The reason for this is that with the cartridge inserted between the cartridge and the jacket of the outer housing an annular space remains, which is also acted upon pressure of the receiving space with pressure. There is thus a kind of pressure compensation inside / outside with respect to the cartridge. The cartridge is less prone to bursting.

Bei der bekannten Druckluflpistole, von der die Erfindung ausgeht, wirkt der Druck im Aufnahmeraum unmittelbar auf den Kartuschenkolben. Der Kartuschenkolben selbst ist das Element, das den Aufnahmeraum gegenüber dem Inneren der Kartusche mit dem darin befindlichen pastösen oder dünnflüssigen Material abdichtet. Bei höherem Druck im Aufnahmeraum kann es passieren, daß der Kartuschenkolben eine Undichtigkeit zeigt. Die in das Material eintretende Druckluft beeinträchtigt die Gleichmäßigkeit des Ausstoßens dieses Materials. Das kann zu Applikationsschäden führen.In the known compressed air gun, from which the invention proceeds, the pressure in the receiving space acts directly on the cartridge piston. The cartridge piston itself is the element which seals the receiving space with respect to the interior of the cartridge with the pasty or viscous material therein. At higher pressure in the receiving space, it may happen that the cartridge piston shows a leak. The compressed air entering the material affects the uniformity of the ejection of this material. This can lead to application damage.

Das zuvor angesprochene Problem bei der aus dem Stand der Technik bekannten Druckluftpistole ist bereits gelöst worden, und zwar durch Anwendung eines Zwischenkolbens, der selbst im Aufnahmeraum abgedichtet geführt ist und seinerseits den Kartuschenkolben im Zylindermantel der Kartusche vor sich herschiebt. Dieser Zwischenkolben kann auch als Teleskopkolben ausgeführt sein ( DE-A-41 37 801 ).The previously mentioned problem with the known from the prior art compressed air gun has already been solved, by using an intermediate piston, which is guided sealed even in the receiving space and in turn pushing the cartridge piston in the cylinder jacket of the cartridge in front of him. This intermediate piston can also be designed as a telescopic piston ( DE-A-41 37 801 ).

Bei allen bekannten Druckluftpistolen ist die wirksame Fläche, auf die der Druck im Aufnahmeraum des Außengehäuses wirkt, etwa so groß wie die Fläche des Kartuschenkolbens selbst. Auch der gegebenenfalls vorhandene Zwischenkolben ist regelmäßig nur unwesentlich größer als der Kartuschenkolben. Dadurch ist der am Kartuschenkolben erzeugbare Ausstoßdruck systematisch begrenzt. Insbesondere bei einem nicht zusätzlich mittels eines Zwischenkolbens abgedichteten Kartuschenkolben kann man nun aber auch den Druck der Druckluft am Druckluftanschluß nicht beliebig erhöhen. Zum einen liefert das normale Druckluftnetz am Einsatzort meist nur einen Druck von wenigen Bar. Zum anderen ergibt sich eine obere Druckgrenze auch durch die Dichtigkeitsanforderungen.In all known compressed air guns, the effective area on which the pressure acts in the receiving space of the outer housing, about the size of the surface of the cartridge piston itself. Also, if necessary, the intermediate piston is regularly only slightly larger than the cartridge piston. As a result, the output pressure that can be generated at the cartridge piston is systematically limited. In particular, in a not additionally sealed by means of an intermediate piston cartridge piston can now but also the pressure of the compressed air at the compressed air connection does not increase arbitrarily. On the one hand, the normal compressed air network usually only supplies a pressure of a few bar at the place of use. On the other hand, an upper pressure limit also results from the tightness requirements.

Als Handgerät hat eine Druckluftpistole der in Rede stehenden Art schließlich auch aus sicherheitstechnischen Gründen (Berstschutz) enge Grenzen beim Arbeitsdruck einzuhalten.As a handheld device, a compressed air gun of the type in question has finally also for safety reasons (burst protection) to adhere to strict limits on the working pressure.

Bekannt ist eine maschinelle Druckpresse für hochviskoses Abschmierfett ( US-A-3,057,521 ), bei der am Außengehäuse ein zusätzlicher Druckluftzylinder mit einem darin abgedichtet verschiebbaren, kleinen Positionierkolben vorgesehen ist. Durch diesen wird die Kartusche an ihrer der Stirnwand des Außengehäuses zugewandten Fläche gegen einen nach innen versetzt umlaufenden Dichtring gedrückt, um hier eine Abdichtung zu schaffen, bevor der Aufnahmeraum des Außengehäuses mit Druck beaufschlagt wird. Dadurch wird ermöglicht, daß bei eingesetzter Kartusche zwischen dem Zylindermantel der Kartusche und dem Mantel des Außengehäuses ein Ringraum verbleiben kann, in dem der Druck aufgebaut werden kann, der auch im Aufnahmeraum herrscht. Dadurch wird ein erhöhter Berstschutz für die Kartusche in dieser maschinellen Hochdruckpresse erzielt. Mit von Hand handhabbaren Druckluftpistolen der gattungsgemäßen Art hat diese maschinelle Druckpresse nichts zu tun.A machine printing press for high viscosity grease ( US-A-3,057,521 ), in which on the outer housing, an additional compressed air cylinder is provided with a small movable positioning piston displaceable therein sealed. By this, the cartridge is pressed on its end wall of the outer housing facing surface against an inwardly offset circumferential sealing ring to provide a seal here before the receiving space of the outer housing is pressurized. This makes it possible that with the cartridge inserted between the cylinder jacket of the cartridge and the jacket of the outer housing, an annular space can remain, in which the pressure can be built, which also prevails in the receiving space. As a result, increased burst protection for the cartridge is achieved in this high-pressure machine press. With hand-held compressed air guns of the generic type, this machine printing press has nothing to do.

Der Lehre der vorliegenden Erfindung liegt das Problem zugrunde, bei einer Druckluftpistole der in Rede stehenden Art den an der Kartusche wirksamem Ausstoßdruck zu erhöhen, ohne den Arbeitsdruck der Druckluftpistole selbst wesentlich zu erhöhen.The teaching of the present invention is based on the problem in a compressed air gun of the type in question effective on the cartridge To increase discharge pressure without significantly increasing the working pressure of the compressed air gun itself.

Die zuvor aufgezeigte Problemstellung ist bei einer Druckluftpistole mit den Merkmalen des Oberbegriffs von Anspruch 1 durch die Merkmale des kennzeichnenden Teils von Anspruch 1 gelöst.The above-indicated problem is solved in a pneumatic gun with the features of the preamble of claim 1 by the features of the characterizing part of claim 1.

Erfindungsgemäß wird durch den zusätzlichen Schubkolben im Druckluftzylinder außerhalb des eigentlichen Arbeitsraums mit dem primär angetriebenen Kartuschenkolben ein zusätzlicher Antrieb gewissermaßen in Reihe geschaltet, der ebenfalls auf den Kartuschenkolben wirkt. Dadurch wird der Ausstoßdruck, der in der Kartusche erzeugt wird, bei gleichem Arbeitsdruck wesentlich erhöht, beispielsweise verdoppelt. Auch pastöse Materialien mit hoher relativer Viskosität können dann zügig aus der Kartusche verarbeitet werden.According to the invention, the additional thrust piston in the compressed air cylinder outside the actual working space with the primary driven cartridge piston, so to speak, connects an additional drive in series, which likewise acts on the cartridge piston. As a result, the discharge pressure generated in the cartridge is substantially increased, for example doubled, at the same working pressure. Even pasty materials with high relative viscosity can then be processed quickly from the cartridge.

Besondere Bedeutung hat eine Ausführungsform der erfindungsgemäßen Druckluftpistole, bei der der Schubkolben nicht immer, sondern nur wahlweise druckbeaufschlagt wird. Für dünnflüssige Materialien kann man dann nur mit dem Arbeitsdruck am Kartuschenkolben arbeiten. Werden pastöse Materialien verarbeitet oder will man schneller arbeiten, so wird der Schubkolben gewissermaßen "zugeschaltet".Of particular importance is an embodiment of the compressed air gun according to the invention, in which the thrust piston is not always, but only optionally pressurized. For low-viscosity materials, you can then work only with the working pressure on the cartridge piston. If pasty materials are processed or if you want to work faster, the thrust piston will be "switched on" as it were.

Ein anderer Weg der Ansteuerung von Kartuschenkolben und Schubkolben besteht darin, die Schubkammer dauernd pneumatisch mit dem Aufnahmeraum zu verbinden. Diese Verbindung kann im Grundsatz in der Wandung des Außengehäuses oder über Leitungen außerhalb des Außengehäuses realisiert werden. Von besonderem Vorteil ist aber eine Ausgestaltung, die dadurch gekennzeichnet ist, daß die Schubkammer über eine Druckleitung, die im Kraftübertragungselement selbst verläuft, mit dem Aufnahmeraum pneumatisch verbunden ist. Insbesondere kann es sich also um einen mehr oder weniger mittig angeordneten Kanal in der Kolbenstange handeln.Another way of controlling the cartridge piston and thrust piston is to permanently connect the thrust chamber pneumatically with the receiving space. This connection can be realized in principle in the wall of the outer housing or via lines outside the outer housing. But of particular advantage is an embodiment which is characterized in that the thrust chamber is pneumatically connected via a pressure line which extends in the power transmission element itself, with the receiving space. In particular, it may therefore be a more or less centrally located channel in the piston rod.

Wie im Stand der Technik kann der Handgriff der Druckluftpistole mit dem Außengebäuse dauerhaft verbunden oder an diesem integral ausgeformt sein. Der Handgriff kann aber auch vom Außengehäuse abnehmbar sein, sei es für Transportzwecke oder zum Zwecke der Anbringung der Druckluftpistole an einem anderen Halter.As in the prior art, the handle of the pneumatic gun may be permanently connected to or integrally molded with the outer housing. The handle can also be removed from the outer housing, be it for transport purposes or for the purpose of attaching the compressed air gun to another holder.

Wegen der an der Kartusche mit dieser Druckluftpistole erzeugbaren hohen Kraft, die teilweise unmittelbar, teilweise mittelbar auf den Kartuschenkolben ausgeübt wird, kommt hier einer Druckkompensation des Zylindermantels der Kartusche besondere Bedeutung zu, die für sich aus dem Stand der Technik bekannt ist ( DE-A-196 32 717 ).Because of the high force which can be generated on the cartridge with this compressed-air pistol and which is exerted partly directly, partly indirectly on the cartridge piston, a pressure compensation of the cylinder jacket of the cartridge is of particular importance, which is known per se from the prior art (US Pat. DE-A-196 32 717 ).

Im übrigen sind bevorzugte Ausgestaltungen und Weiterbildungen der Lehre der Erfindung Gegenstand der weiteren Unteransprüche.Moreover, preferred embodiments and further developments of the teaching of the invention are the subject of the further subclaims.

Im folgenden wird die Erfindung anhand einer lediglich bevorzugte, nicht beschränkende Ausführungsbeispiele darstellenden Zeichnung näher erläutert. In der Zeichnung zeigt

Fig. 1
in schematischer Darstellung ein erstes Ausführungsbeispiel einer erfindungsgemäße Druckluftpistole,
Fig. 2
ausschnittweise, in schematischer Darstellung, eine modifizierte Ausführungsform der Druckluftpistole aus Fig. 1, dargestellt im Bereich des Handgriffes mit einer Ventilanordnung,
Fig. 3
ausschnittweise, ebenfalls in schematischer Darstellung, eine modifizierte Ausführungsform des Ausführungsbeispiels aus Fig. 1, dargestellt im Bereich des Kartuschenkolbens.
In the following the invention with reference to a purely preferred, non-limiting embodiments illustrative drawing is explained in more detail. In the drawing shows
Fig. 1
a schematic representation of a first embodiment of a compressed air gun according to the invention,
Fig. 2
partial, in schematic representation, a modified embodiment of the compressed air gun Fig. 1 , shown in the region of the handle with a valve arrangement,
Fig. 3
a section, also in a schematic representation, a modified embodiment of the embodiment Fig. 1 , shown in the area of the cartridge piston.

Zunächst soll die Druckluftpistole insgesamt anhand von Fig. 1 erläutert werden. Eine solche Druckluftpistole dient zum Ausstoßen von pastösem bis dünnflüssigem Material aus einer Austrittsspitze einer Einweg-Materialpackung. Bei diesem Material kann es sich um zähflüssige Klebemittel, um Abdichtmassen, Schmiermittel, Füllmassen o. dgl. handeln. Wesentlich ist, daß das Ausstoßen des pastösen bis dünnflüssigen Materials mit Hilfe von Druckluft aus einem Druckluftnetz oder aus einer anderen Druckluftquelle erfolgt.First of all, the compressed air gun is based on Fig. 1 be explained. Such a compressed air gun is used to eject pasty to viscous material from an exit tip of a disposable material package. This material may be viscous adhesives, sealants, lubricants, fillers, or the like. It is essential that the ejection of pasty to viscous material by means of compressed air from a compressed air network or from another source of compressed air.

Die dargestellte Druckluftpistole weist zunächst ein an mindestens einer Seite öffenbares Außengehäuse 1 auf. Das Außengehäuse 1 ist im dargestellten Ausführungsbeispiel im wesentlichen zylindrisch ausgestaltet und an einer vorderen Stirnwand 2 öffenbar. Die Stirnwand 2 ist hier als beispielsweise aufschraubbarer Stirnwanddeckel ausgeführt. Es gibt allerdings auch Außengehäuse, die seitlich öffenbar sind.The illustrated compressed air gun initially has an outer housing 1 which can be opened on at least one side. The outer housing 1 is configured substantially cylindrical in the illustrated embodiment and can be opened on a front end wall 2. The end wall 2 is designed here as a screw-on end wall cover, for example. However, there are also outer cases that can be opened laterally.

Im Außengehäuse 1 ist ein druckdichter Aufnahmeraum 3 für eine das auszustoßende Material enthaltende Kartusche 4 ausgebildet. Außerdem ist hier mit dem Außengehäuse 1 ein Handgriff 5 verbunden. Am Außengehäuse 1 befindet sich ein Druckluftanschluß 6 für den Aufnahmeraum 3.In the outer housing 1, a pressure-tight receiving space 3 for a cartridge containing the material to be ejected 4 is formed. In addition, here with the outer housing 1, a handle 5 is connected. On the outer housing 1 is a compressed air connection 6 for the receiving space. 3

In Fig. 1 ist die zu verwendende Kartusche 6 im Aufnahmeraum 3 des Außengehäuses 1 eingesetzt. Diese Kartusche 4 weist an einer vorderen Stirnseite 7 eine Austrittsspitze 8 auf. Im dargestellten Ausführungsbeispiel besteht die Austrittsspitze aus einem Austrittsstutzen direkt an der Stirnseite 7 der Kartusche 4 und einer dort aufgesteckten Kunststoffspitze. Hier sind alle Arten von Austrittseinrichtungen denkbar, beispielsweise auch Austrittsstutzen, die an eine anderweitige Fördereinrichtung angeschlossen sind.In Fig. 1 the cartridge 6 to be used is inserted in the receiving space 3 of the outer housing 1. This cartridge 4 has an outlet end 8 on a front end 7. In the illustrated embodiment, the exit tip consists of an outlet nozzle directly on the end face 7 of the cartridge 4 and a plastic tip plugged there. Here, all types of outlet devices are conceivable, for example, outlet nozzle, which are connected to another conveyor.

An der gegenüberliegenden Stirnseite 9 weist die Kartusche 4 einen Kartuschenkolben 10 auf. Dieser ist in der Kartusche 4, nämlich im Zylindermantel 11 der Kartusche 4, gleitend in Richtung der Austrittsspitze 8 vorschiebbar, so daß aus der Austrittsspitze 8 das in der Kartusche 4 enthaltene Material ausgestoßen wird. Dies geschieht bei eingesetzter Kartusche 4 durch Druckbeaufschlagung des Aufnahmeraums 3. Dazu ist der Aufnahmeraum 3 auch an der die Stirnwand 2 des Außengehäuses 1 durchsetzenden Austrittsspitze 8 abgedichtet, und zwar durch eine hier ringförmige Dichtung 12, an der die vordere Stirnseite 7 der Kartusche 4 unter axialem Druck abdichtend anliegt. Das ist eine der Abdichtungsmöglichkeiten an dieser Stelle. Im Stand der Technik ist hier eine radiale Abdichtung statt einer axialen Abdichtung vorgesehen ( US-A-4,174,068 ).On the opposite end face 9, the cartridge 4 has a cartridge piston 10. This is in the cartridge 4, namely in the cylinder jacket 11 of the cartridge 4, sliding in the direction of the exit tip 8 vorschiebbar, so that from the exit tip 8, the material contained in the cartridge 4 is ejected. This is done with inserted cartridge 4 by pressurizing the receiving space 3. For this purpose, the receiving space 3 is sealed at the end wall 2 of the outer housing 1 passing through the exit tip 8, through an annular seal 12, at the front end side 7 of the cartridge 4 below axial pressure sealingly applied. This is one of the sealing options at this point. In the prior art, a radial seal is provided instead of an axial seal ( US-A-4,174,068 ).

Bei dem hier dargestellten und bevorzugten Ausführungsbeispiel ist nun vorgesehen, daß am Außengehäuse 1 ein zusätzlicher Druckluftzylinder 13 mit einem darin abgedichtet verschiebbaren Schubkolben 14 angeordnet ist, daß der Schubkolben 14 im Druckluftzylinder 13 auf der vom Aufnahmeraum 3 abgewandten Seite eine mit dem Druckluftanschluß 6 verbundene oder verbindbare Schubkammer 15 ausbildet, und daß der Schubkolben 14 auf der der Kartusche 4 zugewandten Seite ein Kraftübertragungselement 16, insbesondere in Form einer Kolbenstange, aufweist, das über eine druckdichte Durchführung 17 in den Aufnahmeraum 3 eintritt und bei eingesetzter Kartusche 4 am Kartuschenkolben 10 kraftübertragend zur Anlage kommt. Die Vorschubkraft am Kartuschenkolben 10 ist dadurch erhöhbar, daß nicht nur der Aufnahmeraum 3, sondern auch die Schubkammer 15 mit erhöhtem Druck beaufschlagbar ist, wobei auf der der Schubkammer 15 gegenüberliegenden Seite des Schubkolbens 14 ein niedrigerer Druck, insbesondere Umgebungsdruck herrscht. Auf der der Schubkammer 15 gegenüberliegenden Seite ist der Druckluftzylinder 13 hier mit einer Luftaustauschöffnung 18 versehen.In the embodiment shown here and preferred embodiment, it is now provided that on the outer housing 1, an additional compressed air cylinder 13 is arranged with a slidingly displaceable therein piston 14, that the thrust piston 14 in the air cylinder 13 facing away from the receiving space 3 Side forms a connected to the compressed air connection 6 or connectable thrust chamber 15, and that the thrust piston 14 on the cartridge 4 side facing a power transmission element 16, in particular in the form of a piston rod, which enters via a pressure-tight passage 17 into the receiving space 3 and at Inserted cartridge 4 on the cartridge piston 10 is force-transmitting to the plant. The feed force on the cartridge piston 10 can be increased so that not only the receiving space 3, but also the thrust chamber 15 can be acted upon with increased pressure, wherein on the thrust chamber 15 opposite side of the thrust piston 14, a lower pressure, in particular ambient pressure prevails. On the opposite side of the thrust chamber 15, the compressed air cylinder 13 is here provided with an air exchange opening 18.

Die Angaben P0 und P1 stehen für den Druck der Umgebungsatmosphäre und den Netzdruck vom Druckluftanschluß 6. Die Druckdifferenz beträgt in den meisten Fällen einige Bar. Die in Fig. 1 eingezeichneten Pfeile zeigen den Strömungsweg der Druckluft bei Druckbeaufschlagung sowie die Wirkungsrichtung des Drucks bezüglich der einzelnen Kolben 10; 14.The data P 0 and P 1 are the pressure of the surrounding atmosphere and the network pressure in most cases from the compressed air connection 6. The pressure difference is a few bar. The in Fig. 1 Plotted arrows show the flow path of the compressed air when pressurized and the direction of action of the pressure with respect to the individual pistons 10; 14th

Das dargestellte und bevorzugte Ausführungsbeispiel zeigt dabei, daß der Schubkolben 14 auf der der Schubkammer 15 gegenüberliegenden Seite im Druckluftzylinder 13 eine Freilaufkammer 19 ausbildet, die über mindestens eine Luftaustauschöffnung 18 mit der Umgebungsatmosphäre in Verbindung steht. Die Freilaufkammer 19 ist somit Bewegungsraum für den Schubkolben 14, ohne eine eigene pneumatische Funktion zu haben. Insgesamt ist dadurch eine nach außen abgeschlossene, kompakte Konstruktion gewährleistet.The illustrated and preferred embodiment shows that the thrust piston 14 on the opposite side of the thrust chamber 15 in the air cylinder 13 a freewheeling chamber 19 is formed, which communicates via at least one air exchange opening 18 with the ambient atmosphere. The freewheeling chamber 19 is thus movement space for the thrust piston 14, without having its own pneumatic function. Overall, this ensures a closed to the outside, compact design.

Wesentlich ist, daß sich hier pneumatisch gesehen der Kartuschenkolben 10 einerseits und der Schubkolben 14 andererseits in einer Art Reihenschaltung befinden, daß also der Arbeitsdruck auf beide Kolben 10, 14 wirkt, über den Schubkolben 14 und das Kraftübertragungselement 16 aber auch wieder zusätzlich auf den Kartuschenkolben 10. Somit addiert sich die resultierende Kraft auf beide Kolben am Kartuschenkolben 10. Der Ausstoßdruck, der auf das Material in der Kartusche 4 wirkt, wird gegenüber den bekannten Konstruktionen stark erhöht, beispielsweise verdoppelt.It is essential that pneumatically seen here are the cartridge piston 10 on the one hand and the thrust piston 14 on the other hand in a series connection, so that the working pressure on both pistons 10, 14 acts on the thrust piston 14 and the power transmission element 16 but also again on the cartridge piston 10. Thus, the resulting force is added to both pistons on the cartridge piston 10. The ejection pressure, which acts on the material in the cartridge 4, is greatly increased compared to the known constructions, for example doubled.

Das dargestellte und bevorzugte Ausführungsbeispiel zeigt im übrigen, daß die vom Schubkolben 14 gebildete Fläche größer ist als die vom Kartuschenkolben 10 gebildete Fläche.The illustrated and preferred embodiment shows, moreover, that the surface formed by the thrust piston 14 is greater than the area formed by the cartridge piston 10.

Das in Fig. 1 dargestellte Ausführungsbeispiel zeigt eine besonders interessante und bevorzugte Ausgestaltung einer erfindungsgemäßen Druckluftpistole. Hier ist nämlich die Konstruktion so getroffen, daß der Druck im Aufnahmeraum 3 unmittelbar auf den Kartuschenkolben 10 wirkt und dennoch eine Kraftübertragung vom Kraftübertragungselement 16 auf den Kartuschenkolben 10 gewährleistet ist. Es ist nämlich vorgesehen, daß das Kraftübertragungselement 16 unter Freilassung zumindest eines wesentlichen Teils der Fläche des Kartuschenkolbens 10 an diesem zur Anlage kommt. Ein an der Seite des Kartuschenkolbens 10 am Kraftübertragungselement 16, also der Kolbenstange, angebrachter Ausdrücker 20 drückt hier lediglich ringförmig auf den Kartuschenkolben 10 und läßt den wesentlichen Teil der Fläche des Kartuschenkolbens 10 innerhalb des Ringes frei. Durchtrittsöffnungen im Ausdrücker 20 erlauben es, daß die Druckluft im Aufnahmeraum 3 unmittelbar auf die Fläche des Kartuschenkolbens 10 wirkt.This in Fig. 1 illustrated embodiment shows a particularly interesting and preferred embodiment of a compressed air gun according to the invention. Here, namely, the construction is made such that the pressure in the receiving space 3 acts directly on the cartridge piston 10 and yet a power transmission from the power transmission element 16 is ensured on the cartridge piston 10. Namely, it is provided that the force transmission element 16 comes to rest, leaving at least a substantial part of the area of the cartridge piston 10 free. A on the side of the cartridge piston 10 on the power transmission element 16, so the piston rod, mounted squeezer 20 presses here only annular on the cartridge piston 10 and leaves the essential part of the surface of the cartridge piston 10 within the ring free. Through openings in the ejector 20 allow the compressed air in the receiving space 3 acts directly on the surface of the cartridge piston 10.

Fig. 3 zeigt eine Variante dazu, die dadurch gekennzeichnet ist, daß das Kraftübertragungselement 16 unter Abdeckung zumindest eines wesentlichen Teils der Fläche des Kartuschenkolbens 10 an diesem zur Anlage kommt. Hier liegt der Ausdrücker 20 i. w. vollflächig am Kartuschenkolben 10 an und überträgt die Kraft selbst auf den Kartuschenkolben 10. Diese Kraft resultiert einerseits aus dem Druck im Aufnahmeraum 3, andererseits aus dem über das Kraftübertragungselement 16 übertragenen Druck am Schubkolben 14 in der Schubkammer 15. Fig. 3 shows a variant thereto, which is characterized in that the force transmission element 16 comes to cover under cover at least a substantial part of the surface of the cartridge piston 10 at this. Here, the squeezer 20 iw over the entire surface of the cartridge piston 10 and transmits the force itself to the cartridge piston 10. This force results on the one hand from the pressure in the receiving space 3, on the other hand from the transferred via the power transmission element 16 pressure on the thrust piston 14 in the thrust chamber 15th

Das dargestellte Ausführungsbeispiel zeigt in keiner der Varianten eine Möglichkeit, die das Kraftübertragungselement 16 mit dem Ausdrücker 20 bietet. Man kann nämlich vorsehen, daß das Kraftübertragungselement 16 am dem Kartuschenkolben 10 zugeordneten Ende selbst im Zylindermantel 11 der Kartusche 4 abgedichtet geführt ist. Das kann beispielsweise durch eine abgedichtete Führung des Ausdrückers 20 im Zylindermantel 11 realisiert sein. Diese zusätzliche Maßnahme verhindert, daß sich die im allgemeinen Teil der Beschreibung erläuterte Undichtigkeit am Kartuschenkolben 10 zeigt.The illustrated embodiment shows in any of the variants, a possibility that provides the power transmission element 16 with the squeezer 20. Namely, it can be provided that the power transmission element 16 at the cartridge piston 10 associated end is guided sealed even in the cylinder jacket 11 of the cartridge 4. This can be realized, for example, by a sealed guide of the ejector 20 in the cylinder jacket 11. This additional measure prevents the illustrated in the general part of the description leak on the cartridge piston 10 shows.

Das dargestellte Ausführungsbeispiel zeigt ferner in keiner der Varianten eine Möglichkeit, die zum Stand der Technik bereits erwähnt worden ist. Danach wäre es nämlich möglich, daß das Kraftübertragungselement am dem Kartuschenkolben zugeordneten Ende an einem in dem Aufnahmeraum selbst abgedichtet geführten, den Kartuschenkolben voranschiebenden Zwischenkolben, ggf. ausgeführt als Teleskopkolben, zur Anlage kommt. Insoweit darf auf den einleitend genannten Stand der Technik verwiesen werden.The illustrated embodiment also does not show in any of the variants a possibility that has already been mentioned in the prior art. It would then be possible for the force transmission element at the end associated with the cartridge piston to come into abutment against a piston which is guided in a sealed manner in the receiving space and advances the cartridge piston, possibly embodied as a telescopic piston. In that regard, reference may be made to the cited prior art.

In Fig. 1 ist der Druckluftanschluß 6 so dargestellt, als sei er nicht steuerbar. Im Normalfall wird das jedoch anders gelöst sein. Normalerweise wird man vorsehen, daß der Druckluftanschluß 6 über eine vorzugsweise im Handgriff 5 angeordnete Ventilanordnung 21 mit einem externen Drucklufteintritt 22 verbunden ist (Fig. 2). Die Ventilanordnung 21 wird regelmäßig über einen Handbetätigungshebel oder eine entsprechende Taste 23 betätigt. Die Ventilanordnung 21 kann im übrigen noch Druckminderer, Sicherheitsventile o. dgl. umfassen, die auch einstellbar sein können. Auch dazu darf auf den einleitend behandelten Stand der Technik verwiesen werden ( DE-A-41 37 801 ).In Fig. 1 the compressed air connection 6 is shown as if it were not controllable. Normally, however, this will be solved differently. Normally, it will be provided that the compressed-air connection 6 is connected to an external compressed-air inlet 22 via a valve arrangement 21, which is preferably arranged in the handle 5 ( Fig. 2 ). The valve assembly 21 is actuated regularly via a manual lever or a corresponding button 23. The valve assembly 21 may also include pressure reducer, safety valves o. The like., Which may also be adjustable. Reference may also be made to the introductory section of the prior art ( DE-A-41 37 801 ).

Fig. 2 zeigt ein modifiziertes Ausführungsbeispiel, für das gilt, daß die Schubkammer 15 getrennt von dem Aufnahmeraum 3 an den Druckluftanschluß 6 bzw. an die Ventilanordnung 21 angeschlossen ist. Mit dieser Konstruktion ist es möglich, den Arbeitsdruck im Aufnahmeraum 3 des Außengehäuses 1 unabhängig vom Arbeitsdruck in der Schubkammer 15 im Druckluftzylinder 13 einzustellen bzw. zu steuern. Dadurch kann man erreichen, daß der Schubkolben 14 antriebstechnisch nur dann zugeschaltet wird, wenn tatsächlich ein Material verarbeitet wird, dessen Konsistenz oder dessen notwendige oder gewollte Arbeitsgeschwindigkeit einen höheren Ausstoßdruck in der Kartusche 4 erfordern. Dazu ist dann eben vorgesehen, daß die Schubkammer 15 wahlweise an den Arbeitsdruck, ggf. an einen geminderten Druck, oder an die Umgebungsatmosphäre anschließbar ist. Fig. 2 shows a modified embodiment, for which it holds that the thrust chamber 15 is connected separately from the receiving space 3 to the compressed air connection 6 and to the valve assembly 21. With this construction, it is possible to adjust or control the working pressure in the accommodating space 3 of the outer casing 1 independently of the working pressure in the thrust chamber 15 in the air cylinder 13. As a result, it can be achieved that the thrust piston 14 is only connected in terms of drive technology when a material is actually processed whose consistency or its required or desired operating speed requires a higher ejection pressure in the cartridge 4. For this purpose, it is then provided that the thrust chamber 15 is selectively connectable to the working pressure, possibly to a reduced pressure, or to the ambient atmosphere.

Das in Fig. 1 und in Fig. 3 dargestellte Ausführungsbeispiel hat eine Konstruktion, die eine bevorzugte Variante darstellt. Hier ist vorgesehen, daß die Schubkammer 15 pneumatisch an den Aufnahmeraum 3 angeschlossen ist. Das kann durch eine Art Bypassleitung vom Aufnahmeraum 3 zur Schubkammer 15 realisiert werden. Das dargestellte und bevorzugte Ausführungsbeispiel zeichnet sich insoweit durch eine besonders zweckmäßige Konstruktion aus, die nämlich dadurch gekennzeichnet ist, daß die Schubkammer 15 über eine Druckleitung 24 in dem Kraftübertragungselement 16, hier also in der Kolbenstange, mit dem Aufnahmeraum 3 pneumatisch verbunden ist. Das ist eine besonders elegante Lösung. Beim in Fig. 1 dargestellten Ausführungsbeispiel liegt dabei der Eintritt in die Druckleitung 24 am Boden des Ausdrückers 20, weil der Ausdrücker 20 selbst geringfügig beabstandet vom Kartuschenkolben 10 liegt.This in Fig. 1 and in Fig. 3 illustrated embodiment has a construction which represents a preferred variant. Here it is provided that the thrust chamber 15 is pneumatically connected to the receiving space 3. This can be realized by a kind of bypass line from the receiving space 3 to the thrust chamber 15 become. The illustrated and preferred embodiment is characterized in this respect by a particularly expedient construction, which is namely characterized in that the thrust chamber 15 is pneumatically connected via a pressure line 24 in the power transmission element 16, here in the piston rod, with the receiving space 3. This is a particularly elegant solution. When in Fig. 1 illustrated embodiment is the entry into the pressure line 24 at the bottom of the ejector 20, because the squeezer 20 itself is slightly spaced from the cartridge piston 10.

Beim Ausführungsbeispiel von Fig. 3 besteht die zuvor angesprochene Zutrittsmöglichkeit nicht. Hier ist in der das Kraftübertragungselement 16 bildenden Kolbenstange eine seitliche Eintrittsöffnung für die Druckleitung 24 vorgesehen.In the embodiment of Fig. 3 does not exist the previously mentioned access option. Here, a lateral inlet opening for the pressure line 24 is provided in the force transmission element 16 forming piston rod.

Bei den hier dargestellten Ausführungsbeispielen kann man vorsehen, daß der Handgriff 5 vom Außengehäuse 1 abnehmbar ist. Das ist eine aus dem Stand der Technik bekannte Maßnahme, die es erlaubt, alternative Antriebssysteme einzusetzen. Damit ist eine Art Baukastensystem realisiert.In the embodiments shown here, it can be provided that the handle 5 is removable from the outer housing 1. This is a measure known from the prior art, which makes it possible to use alternative drive systems. This is a kind of modular system realized.

Im dargestellten und bevorzugten Ausführungsbeispiel ist interessant, daß das Außengehäuse 1 zylindrisch ausgebildet und an der Stirnwand 2 öffenbar ist. Es ist bereits darauf hingewiesen worden, daß die Stirnwand 2 als beispielsweise aufschraubbarer Deckel ausgeführt sein kann. Im dargestellten Ausführungsbeispiel gilt ferner, daß der Mantel des Druckluftzylinders 13 mit dem Mantel des Außengehäuses 1 einstückig ausgeführt ist. Beispielsweise könnte der Mantel als einstückig gespritztes Kunststoff-Formteil ausgeführt sein. Dieses hätte in der Mittelwand, die die rückwärtige Stirnwand des Außengehäuses 1 bildet, die Durchführung 17 und wäre jeweils an den Stirnwänden durch entsprechende Deckel abdichtend verschlossen. Natürlich gibt es eine Vielzahl anderer Möglichkeiten, eine solche Konstruktion zu realisieren.In the illustrated and preferred embodiment, it is interesting that the outer housing 1 is cylindrical and can be opened on the end wall 2. It has already been pointed out that the end wall 2 can be designed as a screw-on lid, for example. In the illustrated embodiment also applies that the jacket of the air cylinder 13 is made in one piece with the jacket of the outer housing 1. For example, the jacket could be designed as a one-piece molded plastic molding. This would have in the middle wall, which forms the rear end wall of the outer housing 1, the bushing 17 and would each be sealingly closed at the end walls by appropriate cover. Of course, there are a variety of other ways to realize such a construction.

Das dargestellte und bevorzugte Ausführungsbeispiel zeigt weiter eine besondere, wenn auch für sich bekannte Konstruktion ( DE-A-196 32 717 ), die dem Druckausgleich am Zylindermantel 11 der Kartusche 4 dient. Durch einen solchen Druckausgleich kann die Kartusche 4 mit einem dünneren Zylindermantel 11 oder einem Zylindermantel 11 aus einem weniger widerstandsfähigen Material, ggf. sogar aus Pappe, ausgeführt werden. Ungeachtet dessen kann man im Inneren der Kartusche 4 einen hohen Druck erzeugen, der nicht zu einem Bersten der Kartusche 4 führt. Wie das bereits im Stand der Technik realisiert worden ist, ist dazu auch hier vorgesehen, daß bei eingesetzter Kartusche 4 zwischen dem Zylindermantel 11 der Kartusche 4 und dem Mantel 25 des Außengehäuses 1 ein Ringraum 26 verbleibt, in dem der Druck im Aufnahmeraum 3 herrscht. Ist der weiter oben als Variante beschriebene Zwischenkolben vorgesehen, so muß man eine entsprechende Umwegleitung für diesen Druckausgleich vornehmen.The illustrated and preferred embodiment further shows a particular, albeit known construction ( DE-A-196 32 717 ), which serves to equalize the pressure on the cylinder jacket 11 of the cartridge 4. By such a pressure equalization, the cartridge 4 with a thinner cylinder jacket 11 or a cylinder jacket 11 made of a less resistant material, possibly even made of cardboard, are executed. Regardless, you can go inside the cartridge 4 generate a high pressure, which does not lead to bursting of the cartridge 4. As has already been realized in the prior art, it is also provided here that with the cartridge 4 inserted between the cylinder jacket 11 of the cartridge 4 and the jacket 25 of the outer housing 1, an annular space 26 remains in which the pressure prevails in the receiving space 3. If the intermediate piston described above as a variant is provided, then one must make a corresponding detour line for this pressure equalization.

Eine weitere interessante Konstruktion ist im Aufnahmeraum 3 der in Fig. 1 dargestellten Druckluftpistole realisiert. Es ist vorgesehen, daß im Aufnahmeraum 3 am der Stirnwand 2 gegenüberliegenden Ende eine Abstützung 27 für die hintere Stirnseite 9 der eingesetzten Kartusche 4, insbesondere in Form einer rippenförmig ausgebildeten oder durchbrochenen Stützhülse, vorgesehen ist. Durch diese Abstützung 27 kann die Kartusche 4 bezüglich der vorderen Stirnwand 2 des Außengehäuses 1 sauber positioniert und eingespannt werden, so daß die axiale Dichtung 12 an der Stirnwand 2 unter dem notwenigen Dichtungsdruck steht, um den Arbeitsdruck im Aufnahmeraum 3 definiert erreichen zu können.Another interesting construction is in the recording room 3 of the Fig. 1 realized compressed air gun realized. It is envisaged that a support 27 for the rear end face 9 of the inserted cartridge 4, in particular in the form of a rib-shaped or perforated support sleeve, is provided in the receiving space 3 at the end wall 2 opposite end. By this support 27, the cartridge 4 can be properly positioned and clamped with respect to the front end wall 2 of the outer housing 1, so that the axial seal 12 is on the end wall 2 under the necessary sealing pressure to achieve the working pressure in the receiving space 3 can defined.

Claims (11)

  1. Blow gun for discharging paste-like to fluid material, comprising an outer casing (1), which can be opened on at least one side and has a pressure-tight receiving space (3) for a cartridge (4) containing the material, and a handle (5) connected to the outer casing (1),
    and further comprising a compressed-air connection (6) for the receiving space (3),
    wherein the cartridge (4) to be used has on a front end face (7) a discharge nozzle (8) or the like and on the opposite end face (9) a cartridge piston (10),
    wherein, when the cartridge (4) is inserted, the receiving space (3) is sealed off also at the discharge nozzle (8) passing through the end wall (2) of the outer casing (3), and
    wherein, through pressurization of the receiving space (3), the cartridge piston (10) can be advanced in the cartridge (4) in the direction of the discharge nozzle (8), so that the material is discharged from the discharge nozzle (8),
    characterized
    in that on the outer casing (1) there is disposed an additional compressed-air cylinder (13) having a thrust piston (14) which is displaceable therein in a sealed-off manner,
    in that the thrust piston (14) forms in the compressed-air cylinder (13), on the side facing away from the receiving space (3), a thrust chamber (15) connected or connectable to the compressed-air connection (6),
    in that the thrust piston (14), on the side facing the cartridge (4), has a force transmission element (16), in particular in the form of a piston rod, which enters the receiving space (3) via a pressure-tight lead-through (17) and, when the cartridge (4) is inserted, comes to bear in a force-transmitting manner against the cartridge piston (10), and
    in that the advancement force at the cartridge piston (10) can be increased by virtue of increased pressure being able to be applied not only to the receiving space (3) but also to the thrust chamber (15), a lower pressure, in particular ambient pressure, prevailing on that side of the thrust piston (14) which lies opposite the thrust chamber (15).
  2. Blow gun according to Claim 1, characterized in that the thrust piston (14), on the side lying opposite the thrust chamber (15), forms in the compressed-air cylinder (13) an open-air chamber (19), which is connected to the surrounding atmosphere via at least one air exchange opening (18).
  3. Blow gun according to Claim 1 or 2, characterized in that the area formed by the thrust piston (14) is larger than the area formed by the cartridge piston (10).
  4. Blow gun according to one of Claims 1 to 3, characterized in that the force transmission element (16) comes to bear against the cartridge piston (10), at least a substantial part of the area of the latter being left free.
  5. Blow gun according to one of Claims 1 to 3, characterized in that the force transmission element (16) comes to bear against the cartridge piston (10), at least a substantial part of the area of the latter being covered,
    the force transmission element (16), at its end assigned to the cartridge piston (10), preferably itself being guided in a sealed-off manner in the cylinder shell (11) of the cartridge (4), or
    the force transmission element (16), at its end assigned to the cartridge piston (10), preferably coming to bear against an intermediate piston, which is itself guided in a sealed-off manner in the receiving space (3) and pushes ahead the cartridge piston (10).
  6. Blow gun according to one of Claims 1 to 5, characterized in that the compressed-air connection (6) is connected to an external compressed-air inlet (22) via a valve arrangement (21),
    the valve arrangement (21) preferably being disposed in the handle (5).
  7. Blow gun according to one of Claims 1 to 6, characterized in that the thrust chamber (15) is connected separately from the receiving space (3) to the compressed-air connection (6) or to the valve arrangement (21),
    the thrust chamber (15) preferably being connectable, according to choice, to the working pressure of the compressed-air connection (6), to a reduced pressure or to the surrounding atmosphere.
  8. Blow gun according to one of Claims 1 to 6, characterized in that the thrust chamber (15) is pneumatically connected to the receiving space (3), in particular via a pressure line (24) in the force transmission element (16) itself.
  9. Blow gun according to one of Claims 1 to 8, characterized in that the outer casing (1) is of cylindrical configuration and, preferably, can be opened at the end wall (2),
    the compressed-air cylinder (13) preferably being arranged coaxially with the receiving space (3) of the outer casing (1) and, at the end face, being arranged contiguous with the outer casing (1), and
    also preferably, the shell of the compressed-air cylinder (13) being realized in one piece with the shell of the outer casing (1).
  10. Blow gun according to one of Claims 1 to 9, characterized in that, when the cartridge (4) is inserted, there remains between the cylinder shell (11) of the cartridge (4) and the shell (25) of the outer casing (1) an annular space (26), in which the pressure in the receiving space (3) prevails.
  11. Blow gun according to one of Claims 1 to 10, characterized in that in the receiving space (3), at the end lying opposite the end wall (2), a support (27) for the rear end face (9) of the inserted cartridge (4), in particular in the form of a ribbed or perforated supporting sleeve, is provided.
EP06753637A 2005-06-03 2006-05-16 Compressed-air gun Active EP1885508B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202005008831U DE202005008831U1 (en) 2005-06-03 2005-06-03 Compressed air gun
PCT/EP2006/004600 WO2006128578A1 (en) 2005-06-03 2006-05-16 Compressed-air gun

Publications (2)

Publication Number Publication Date
EP1885508A1 EP1885508A1 (en) 2008-02-13
EP1885508B1 true EP1885508B1 (en) 2009-02-11

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Application Number Title Priority Date Filing Date
EP06753637A Active EP1885508B1 (en) 2005-06-03 2006-05-16 Compressed-air gun

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EP (1) EP1885508B1 (en)
AT (1) ATE422400T1 (en)
AU (1) AU2006254407B2 (en)
DE (2) DE202005008831U1 (en)
WO (1) WO2006128578A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102009007116B4 (en) * 2009-02-02 2015-02-19 Henkel Ag & Co. Kgaa Container with valve for a dispensing gun and dispensing system

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Publication number Priority date Publication date Assignee Title
DE102008047234B4 (en) 2008-09-12 2018-12-06 Henkel Ag & Co. Kgaa Repair nozzle and repair system
ES2696542T3 (en) * 2009-02-06 2019-01-16 Tecres Spa Supply unit for a biphasic compound mixer
DE102009011178A1 (en) 2009-03-04 2010-09-16 Henkel Ag & Co. Kgaa repairing
FR2998200B1 (en) * 2012-11-21 2014-11-28 Alexis Albin DEVICE FOR REMOVING GLUE
DE102013207021A1 (en) 2013-04-18 2014-10-23 Henkel Ag & Co. Kgaa Adapter for an output device
FR3069466B1 (en) * 2017-07-27 2020-09-18 Supratec DEVICE FOR DISTRIBUTION OF A VISCOUS PRODUCT
DE102017214835B4 (en) * 2017-08-24 2021-11-04 BSH Hausgeräte GmbH Printhead and method for extruding printing compound from a food cartridge

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US3057521A (en) * 1960-09-06 1962-10-09 Herman E Ballard Heavy-grease dispenser
US4174068A (en) 1978-11-07 1979-11-13 Rudolph Robert L Gun having disposable cartridge
DE8028881U1 (en) * 1980-10-30 1981-04-02 Roland, Otto, 8752 Kleinostheim GASKET GUN WITH DOUBLE PISTON
EP0452270B1 (en) * 1990-04-10 1993-11-18 Wilhelm A. Keller Dispensing device using double cartridges
US5181636A (en) * 1990-12-14 1993-01-26 Milbar Corporation Incremental dispensing device
DE4134141C2 (en) * 1991-10-16 1994-03-24 Tecalemit Gmbh Deutsche Compressed air gun for applying pasty material
DE4137801A1 (en) 1991-11-16 1993-05-19 Tecalemit Gmbh Deutsche AIR PISTOL FOR APPLYING PASTOESE MATERIAL
DE9212015U1 (en) * 1991-11-16 1992-11-26 Deutsche Tecalemit Gmbh, 4800 Bielefeld Pneumatic gun for applying pasty material
DE4315761A1 (en) * 1993-05-11 1994-11-17 Jonsdorf Maschbau Gmbh Device for inserting glue into holes
DE29519348U1 (en) * 1995-12-06 1996-02-15 Ritter, Ralf, 86836 Untermeitingen Pneumatic cartridge ejection device

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Publication number Priority date Publication date Assignee Title
DE102009007116B4 (en) * 2009-02-02 2015-02-19 Henkel Ag & Co. Kgaa Container with valve for a dispensing gun and dispensing system

Also Published As

Publication number Publication date
EP1885508A1 (en) 2008-02-13
AU2006254407B2 (en) 2010-05-27
ATE422400T1 (en) 2009-02-15
DE502006002826D1 (en) 2009-03-26
AU2006254407A1 (en) 2006-12-07
WO2006128578A1 (en) 2006-12-07
DE202005008831U1 (en) 2006-10-12

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