EP2747900A1

EP2747900A1 - Mixer and dispensing device

Info

Publication number: EP2747900A1
Application number: EP12746331.3A
Authority: EP
Inventors: Alexander Bublewitz; Jens-Peter Reber
Original assignee: Kettenbach GmbH and Co KG
Current assignee: Kettenbach GmbH and Co KG
Priority date: 2011-08-24
Filing date: 2012-08-10
Publication date: 2014-07-02
Anticipated expiration: 2032-08-10
Also published as: US9700859B2; US9782737B2; EP2747900B1; EP2747899A1; BR112014004109A2; ES2714273T3; IN2014CN02197A; US20140290773A1; US20170157581A1; EP2747899B1; DE202012013429U1; WO2013026717A1; US9550159B2; BR112014004109B1; WO2013026721A1; US20140301154A1

Abstract

The invention relates to a dispensing device comprising two interconnected containers (4a, 4b) and a mixer (3). Said mixer can be joined to the containers (4a, 4b), preferably, by means of an external screw thread (17). Said mixer also comprises a coupling element (13), a mixer housing (11) which can rotate in relation to said coupling element and a mixer element (12) which is received in the mixer housing (11).

Description

Mixer and dispenser

The invention relates to a mixer having a coupling element with inlet nozzle, a mixer housing which can be rotated relative to the coupling element and has an outlet opening and an opposite inlet end in which the coupling element is accommodated, and a mixer element accommodated in the mixer housing which defines a longitudinal axis of the mixer. finiert. Furthermore, the invention relates to a dispenser with at least two interconnected containers and such a mixer.

A mixer of the aforementioned type and a corresponding dispensing device are known, for example, from EP 0 733 022 B1, wherein the mixer can be locked to the cartridge by means of a bayonet closure. The seal between the coupling element of the mixer and the mixer housing takes place between an approximately cylindrical outer wall of the coupling element and a corresponding inner wall of the mixer housing. The mixer known from EP 0 733 022 B1 is a so-called static mixer, d. H. a mixer in which the mixer element is non-rotatably drivable. A similar dispenser is also known from US 5,333,760 or EP 0 730 913 B1.

EP 1 968 751 B1 also describes a mixer and a dispenser, wherein the mixer consists only of a mixer housing and a mixer element received therein. Both the mixer housing and the mixer element take on functions of a coupling element for connection to a cartridge housing. EP 2 335 641 A1 describes a double cartridge and a static mixer which can be connected to it. The connection between the mixer and the double cartridge takes place via a bayonet connection, which is provided on a cap, which surrounds the coupling element and the mixer housing and is rotatable relative thereto. In this mixer, the coupling element is designed in one piece with the mixer element, wherein these in turn are rotatably mounted in the mixer housing. A similar solution with a union nut is known from EP 1 440 737 A1. In known mixers and dispensers, there is a risk that they will be released from each other when the recorded in the containers components are applied with too much pressure. This can be done either with the use of highly viscous or pasty materials or at too high a selected rate of application. In addition, leaks may occur within the mixer even if the application pressure is too high, in particular between the mixer housing and the coupling element.

Instead of a connection of the components of the mixer by means of a latching mechanism which is susceptible to leaks as described above, the components can also be welded together, for example by means of ultrasonic welding. However, this is expensive and therefore unfavorable for mixers that are disposable.

The connection between the mixer and the cartridge requires, for example, in the solutions according to EP 0 733 022 B1 or EP 2 335 641 A1 a visual control and an exact placement of the mixer in a predetermined position. This is partly perceived as laborious and impractical. In addition, in the mixers of the prior art, a special orientation of the coupling element relative to the mixer housing is required even during assembly of the mixer, since the mixer otherwise would not be mounted on the cartridge. can be set. This requires an additional cost-producing assembly step including the required quality control.

It is therefore an object of the present invention to provide a mixer and an exhaust device of the type mentioned above which avoid the above-mentioned disadvantages of known mixers and in particular allow an improved connection between the mixer and the cartridge and an improved sealing of the mixer itself , This object is achieved with a mixer with the feature of claim 1. The inlet end of the mixer housing is provided with an external thread. This makes it possible to screw the mixer into, for example, a sleeve-like structure of a cartridge which is provided with an internal thread. The screw connection by means of a thread makes it possible to accommodate larger loads in comparison to other types of connection, for example a bayonet closure acting only at certain points. The risk that the mixer flakes off the cartridge can thus be minimized even at high discharge pressure. A particular advantage also results from the fact that the mixer housing itself is provided with the external thread, since the force flow takes place at high discharge pressure directly between the mixer housing and the cartridge and thus no additional component, such as, for example, from the prior art known union nuts or caps, as potential vulnerabilities are provided. In addition, in a screw, unlike a bayonet closure, neither an exact alignment of the mixer to a cartridge or the like. Still required between the mixer housing and the coupling element.

In some applications, the components to be mixed in the mixer are in different volumes. Accordingly, the inlet ports of the mixer or the outlet ports of the cartridge can also be be designed differently large. In order to facilitate the correct placement of the mixer on the cartridge, it is therefore preferred if the coupling element has a positioning tongue which extends parallel to the inlet nozzles and protrudes beyond the inlet nozzles in the direction away from the outlet opening. Such a positioning tab can prevent the mixer from being attached to it in misalignment with the cartridge. In particular, this also makes it possible to prevent undesired contact of the mixer inlet connection with the outlet connection or openings of the cartridge, which can lead to a mixing of the components already in the region of the cartridge, which then harden and render the cartridge unusable. Alternatively, an opening may also be provided on the mixer into which a positioning tongue or the like of the cartridge engages.

In a further development of this inventive concept, it is provided that the positioning tongue tapers in the direction away from the outlet opening. This facilitates "finding" the positioning tab and a corresponding opening contour. At the same time, this can lead to a pre-alignment of the coupling element relative to the cartridge, so that the inlet connection and the outlet connection meet in an ideal orientation.

In other words, the attachment of a mixer according to the invention to a cartridge takes place with the following steps: First, the positioning tongue comes into contact with the corresponding receptacle on the cartridge at a certain point, whereby initially there is play between the positioning tongue and the receptacle in the cartridge. Thereafter, the positioning tongue acts as a guide rail in a, for example tapered, channel in the cartridge. As a result, the mixer is thereby automatically centered and aligned in the cartridge by the axial insertion of the positioning tongue. In order to facilitate the screwing of the mixer on a cartridge or the like., It is preferred if the thread is a multi-start thread, in particular a three-piece thread. As a result, not only are three starting points for the threaded engagement present, but it is also a rotation of the mixer to the cartridge by a comparatively small amount, for example. In a three-piece thread only 120 °, sufficient to establish a firm connection between the mixer and the Produce cartridge. It is particularly preferred if the threads of the mixer and corresponding threads of the cartridge are set back so that the mixer can first be introduced with its mixer housing in an example. Sleeve-like recording of the cartridge and only then the two threads interlock.

Preferably, the mixer is configured such that the coupling element has sealing means on its side facing the outlet opening. When the coupling element is received in, for example, an approximately cup-shaped inlet end of the mixer housing, the sealing effect between the coupling element and the mixer housing is improved by tightening the screw connection of the mixer with a cartridge. In addition, the sealing effect is also improved by an application pressure acting on the coupling element. As the pressure increases, the coupling element consequently also seals more strongly with respect to the mixer housing in the case of such an end-side seal.

In a further development of this inventive concept, it is provided that the coupling element on its side facing the outlet opening has two annular projections, between which a circumferential groove is formed, in which a ring-like projection of the mixer housing sealingly engages. In other words, an annular tongue and groove connection is created between the mixer housing and the coupling element, which allows a rotation of the coupling element relative to the mixer housing, but also achieved a particularly good sealing effect. Alternatively, this axial seal can also be constructed in reverse, ie with a groove in the mixer housing into which a ring-like projection of the coupling element engages.

Furthermore, an additional threaded connection can also be formed between the coupling element and the mixer housing so that the coupling element is rotated into the mixer housing during relative rotation of the mixer housing during attachment of the mixer to a cartridge having a stroke defined by the additional thread is pulled. This ensures a defined sealing effect.

The above-described axial sealing constitutes a preferred embodiment of the invention. Nevertheless, it is alternatively possible to provide a radial seal, for example by means of a radial groove in the mixer housing and a ring-like projection in the coupling element, instead of the axial seal.

The inlet ports of the coupling element expediently extend parallel to the longitudinal axis of the mixer and thereby form channels which preferably open via at least one radial opening into a mixing chamber formed by the mixer housing, in which the mixer element is provided. At least one of the channels opening into the mixing chamber can also be provided with a deflection, for example by a channel section extending approximately arcuately around the longitudinal axis of the mixer. Alternatively or in addition to this, it is also possible for at least one of the channels to form a first section extending in the direction of the longitudinal axis of the mixer, an adjoining U-shaped deflection and a further channel section extending parallel to the first section, which then penetrates into the Mixing room opens. This can reduce the lead of one of the components, so that a good mixing result is obtained from the beginning. In addition, also reduces the risk of recontamination at the end of the mixing process, ie substances taken up in the mixing chamber can not or at most only flow back into the cartridge poorly. Alternatively or additionally, it is also possible to reduce the cross-section of at least one of the openings opening into the mixing space through a bulkhead or the like.

If the coupling element has at least one radially outwardly projecting latching projection which engages in a radial groove in the inlet end of the mixer housing, a (pre) assembly of the mixer can be provided such that the coupling element and the mixer housing are already provided connected to one another, without the risk that the coupling element falls out of the mixer housing. The steps required to assemble the mixer are thus reduced to the insertion of the mixer element into the mixer housing and the locking of the coupling element in the mixer housing.

Preferably, the coupling element is held freely rotatably in the mixer housing. This is necessary in order, on the one hand, to make it possible to align the inlet connection of the mixer with the corresponding outlet connection of the cartridge and, on the other hand, to screw the mixer housing to the cartridge. Thus, the coupling element can be arranged in any (rotational) position of the inlet nozzle to the mixer housing, without this would affect the process of connection of mixer and cartridge. It has proved to be particularly advantageous if the coupling element is also held displaceably in the latter at least by a limited amount in the axial direction parallel to the longitudinal axis of the mixer. This can be done, for example, in that the radial groove in the inlet end of the mixer housing in the axial direction is slightly larger than the latching projection of the coupling element is formed. The axial displaceability of the coupling element for example, less than 1 mm, in particular between 0.1 mm and 0.5 mm, relative to the mixer housing. As a result, on the one hand, slight tolerances within the mixer can be compensated for when screwing the mixer onto a cartridge. On the other hand, it is also possible to improve the sealing effect between the coupling element and the mixer housing during screwing by the coupling element is pressed firmly into the mixer housing.

The mixer according to the invention can be used either as a static mixer, i. H. be configured with a non-driven mixer element, or as a dynamic mixer with a driven mixer element. In dynamic mixers, an opening is formed in the coupling element, through which the mixer element can extend in such a way that it can be connected to a drive shaft. Often this is a hexagonal shaft, which can engage in a corresponding inner hexagonal contour of the mixer element.

Regardless of the features described above, the invention also relates to a mixer having a coupling element with inlet nozzle, a mixer housing rotatable relative to the coupling element, which has an outlet opening and an opposite inlet end, in which the coupling element is accommodated, and one accommodated in the mixer housing Mixer element defining a longitudinal axis of the mixer. In this case, the coupling element is preferably provided with a bearing bush in which the mixer element is mounted rotatably and sealed. In this way, the tightness of the dynamic mixer can be further improved. In a particularly preferred embodiment of this inventive concept, the bearing bush is an approximately cylindrical component, which is held only with one end or only partially within the coupling element. A free end of the bearing bushes can bear sealingly against the mixer element, so that even slight angular deviations between the alignment of the longitudinal axis se of the mixer element and the longitudinal axis of the other mixer components can be compensated.

Instead of an external thread on the mixer housing, a bayonet fastening means may also be provided on the mixer housing for a dynamic mixer, which is formed, for example, by radially projecting bayonet tabs.

Regardless of the type of attachment of the mixer to the cartridge, the orientation of the coupling element to the cartridge or the like is also preferred in dynamic mixers by means of a positioning tongue which engages in a corresponding opening contour. In this case, the positioning tongue can also prevent a wrong orientation of the inlet nozzle to the outlet nozzle occurs. The invention further relates to a dispenser having at least two interconnected containers having a common outlet area with outlet ports for each of the containers, and a mixer detachably connectable to the outlet area, having a coupling portion with inlet ports each connectable to an outlet port Mixer housing and has a recorded in the mixer housing mixer element. The outlet region of the container is equipped according to the invention with an internally threaded portion for connection to an externally threaded portion of the mixer housing. This is preferably a multi-start, in particular a three-part, thread. The at least two containers of the exhaust device can be combined to form a cartridge, with the containers, for example, being provided parallel to one another or nested one inside the other.

According to a particularly preferred embodiment of the dispensing device according to the invention, either the outlet area of the containers or the coupling element of the mixer on a positioning tongue, which may extend, for example, parallel to the inlet or outlet nozzle. Furthermore, an opening contour for receiving the positioning tongue is provided in the coupling element of the mixer or in the outlet area of the container. This opening contour can, for. B. larger than the positioning tongue or funnel-shaped to facilitate the introduction of the positioning tongue in the opening contour.

In order to prevent an incorrect attachment of the mixer to the container and an unwanted contact of the mixer inlet nozzle with the outlet or orifices of the cartridge, the positioning tongue preferably protrudes in the direction away from the outlet opening via the inlet nozzles of the mixer such that the inlet nozzles and the outlet nozzles only then engage with each other when the positioning tongue is at least partially included in the opening contour. Also, the threaded portions of the mixer and the container preferably engage each other only when the positioning tongue is received in the opening contour.

Preferably, the positioning tongue is funnel-shaped in the opening slidably guided when the outlet nozzle with the inlet nozzle are sealingly pushed into each other. In other words, during assembly of the mixer on the containers of the cartridge, the positioning tab is in contact with the opening and aligns both the inlet and outlet ports to one another and the threads to each other. This is particularly relevant in a frequently occurring in practice mixer change to a cartridge inserted in a dispensing device, since the inlet and outlet are in this case for a user usually covered, so it is important that the nozzle and thread by itself align. In a further development of the inventive concept, it is provided that the positioning tongue and the opening contour are designed such that the positioning tongue can be introduced into the opening contour only in exactly one position. This can be done, for example, in that the positioning tongue and the corresponding opening contour are curved, for example convex, configured or, for example, of asymmetrical design.

According to a further embodiment of the invention, the outlet region of the containers is provided with a plate in which the outlet nozzles are flush and in which an opening contour for receiving the positioning tongue is provided. In this case, an annular collar adjoins the plate, in which the internally threaded portion is formed. This allows a particularly good power transmission between the mixer and the containers. Preferably, ribs are formed in the plate which, for example, can be arranged between the outlet nozzles. The ribs are opposite the plate in the direction of the mixer and thus prevent in addition that the mixer is placed incorrectly. In addition, such a transverse ribbing between and / or below the outlet channels of the cartridge can avoid unwanted entrainment of, for example, the catalyst paste or the base paste of a two-component mixture to the respective other channel. Soiling of the cartridge collar bottom with catalyst or base impression material, for example when pulling out the mixer to change the mixer - from one cartridge up to 10 or more impressions, ie discharge operations with each new mixer, are usually unavoidable in everyday use , However, the transverse ribs catch the flowing mass in the area between the ribs and thus prevent rapid carryover to the other outlet channel. Contaminated material could lead to contamination of one component with the other component, ie prematurely Curing, clogging the channels or lead to instability of the filled material.

In addition to the task of preventing an incorrect insertion of the positioning tongue or of the channels, the transverse ribbing therefore has the further important second function of preventing the carryover and contamination of the two pastes to the other channel.

Furthermore, the invention relates to a dispensing device having at least two containers connected to one another which have a common outlet region with outlet nozzles for each of the containers, and to a closure element that can be detachably connected to the outlet region. The outlet region of the container in this case has an internally threaded portion and the closure element latching means which are detachably fastened to the internal thread. The containers preferably have outlet stubs and the closure element in these deployable stoppers, wherein the stoppers are connected to the latching means via a torsion element. In other words, the closure element may be a one-piece component which can be snapped onto the cartridge and lifted by twisting.

The invention will be explained in more detail using an exemplary embodiment and with reference to the drawing.

They show schematically:

FIG. 1 shows a sectional view of a dispensing device according to the invention,

FIG. 2 shows the dispensing device according to FIG. 1 before the mixer is put on, FIG. 3 is an enlarged view of the dispenser of FIG. 1 during assembly of the mixer;

FIG. 4 shows a perspective view of a mixer according to the invention,

FIG. 5 shows a sectional view of the mixer according to FIG. 4,

FIG. 6 is an exploded view of the components of the mixer of FIG. 4;

7 shows a perspective view of the rear side of the coupling element of the mixer according to FIG. 4, FIG.

8 is a perspective view of the front side of the coupling element of the mixer according to FIG. 4, FIG.

9 is a sectional view of the coupling element of the mixer of Figure 4,

FIG. 10 shows a perspective view of a cartridge according to the invention with a closure element,

FIG. 11 is a perspective view of the closure element according to FIG. 10;

Figure 12 is a perspective view of a detail of another embodiment of a

Dispenser

13 shows a perspective view of another embodiment of a mixer, and FIG. 14 shows a sectional view of the mixer according to FIG. 13 in a cartridge system. The dispensing device 1 shown in Figures 1 to 3 consists of a double cartridge 2 and a mixer 3, which is detachably connected to the double cartridge 2 connectable. The double cartridge 2 is formed in the illustrated embodiment by two integrally connected containers 4a, 4b, which have a different cross-section, to accommodate different volumes of two different components, in particular a base material and a catalyst mass for producing a dental product. The two containers 4 a, 4 b are closed at their end facing away from the mixer 3 by discharge pistons 5 a, 5 b, which can be pushed forward within the double cartridge 2 in order to discharge the components received in the containers 4 a, 4 b through the mixer 3. The embodiment according to FIG. 1 is a so-called directly filled cartridge, in which the components are accommodated directly in the containers 4a, 4b. Alternatively, it is also possible to include the components in tubular bags, which in turn are introduced into the container.

Each of the two containers 4a, 4b has an outlet connection 6a or 6b, wherein the outlet connections form a common outlet region of the double cartridge 2. For this purpose, the two outlet ports 6a, 6b are provided with a plate 7, which extends perpendicular to the outlet ports 6a, 6b, so that the outlet ports 6a, 6b open flush into the plate 7. In the direction of the mixer 3 protrudes from the plate 7, a circumferential collar 8 away, which is provided with an internal thread 9. Further, in the plate 7, an arcuate opening 10 is formed. Between the two containers 4a, 4b of the double cartridge 2 extends a channel for receiving a drive shaft (not shown), which also opens flush in a central opening 7a in the plate 7. Notwithstanding the illustrated embodiment, the openings 7a and 10 may also be formed as a common opening. As can be seen from the representation of FIG. 6, the mixer 3 comprises a mixer housing 11, which forms a mixing chamber in its interior, a mixer element 12 accommodated in the mixer housing and a coupling element 13 (cover) which can be connected to the mixer housing. The mixer housing 1 1 is provided at its end facing away from the double cartridge 2 with an outlet opening 14 which is tapered with respect to the mixing chamber forming the cylindrical portion of the mixer housing 1 1. The inlet opening 14 opposite the inlet end of the mixer housing 1 1 is widened like a pot to receive the coupling element 13. In this case, the coupling element 13 can be latched in the mixer housing 11 by forming a circumferential groove 15 in the mixer housing 11 into which an annular latching projection 16 can engage on the outside of the coupling element 13. The coupling element 13 is thus freely rotatably received in the mixer housing 1 1. Depending on the size of the groove 15 and the locking projection 16 in the axial direction, however, the coupling element 13 may slightly, for example. Less than about 1 mm, move in the axial direction relative to the mixer housing 1 1.

The mixer 3 shown in the figures is a dynamic mixer, in which the mixer element 12 can be driven via the drive shaft (not shown). For this purpose, the mixer element 12 extends through a central opening in the coupling element 13 and can engage in the central opening 7a in the plate 7 of the outlet end of the double cartridge 2. The mixer element 12 carries a plurality of mixing vanes, with which the components discharged from the double cartridge 2 can be mixed together in the mixing space before they emerge from the outlet opening 14.

The mixer housing is provided with an external thread 17 which is provided on the outside at the pot-like enlarged inlet end of the mixer housing 1 1. The external thread 17 and the internal thread 9 are for connecting the Schers 3 with the double cartridge 2 matched. In the illustrated embodiment, the threads are a three-piece thread with three threaded sections. This makes it possible to bring the threads 9 and 17 into engagement with each other at three points offset by 120 ° from each other. In addition, only a slight rotation of the mixer 3 relative to the double cartridge 2 is required to screw the mixer onto the double cartridge. The threaded connection can be designed in such a way that a defined latching position is perceptibly and / or audibly displayed upon complete tightening of the mixer 3 on the double cartridge 2. This can be done, for example, that the thickness of the thread segments (spiral thread ribs) at the end of the screw slightly increases and then drops, so that a small resistance must be overcome in order to tighten the thread completely or to solve. Further, 1 1 wings 18 are provided on the outside of the mixer housing, which facilitate the manual screwing of the mixer 3. The wings 18 extend between a collar 19 which surrounds the cylindrical part of the mixer housing 1 1, and the pot-like extended inlet end of the mixer housing. The collar 19 has the advantage that the wings 18 can not lead to any irregular shrinkage distortion in the cylindrical part of the mixer housing 1 1. This in turn ensures that the mixing vanes of the mixer element 12 can be stripped with very narrow tolerances on the cylindrical inner wall of the mixing chamber formed by the mixer housing 11. This is advantageous for a homogeneous mixture. Alternatively or in addition to the wings 18, other means may be provided which facilitate the manual screwing of the mixer 3, for example a (multi) angular configuration of areas of the mixer housing 11.

The embodiment of the coupling element 13 can be seen from FIGS. 7 to 9, wherein FIG. 7 shows the rear side facing the double cartridge 2 and FIG Figure 8 show the opposite front side of the coupling element 13. In the coupling element, two inlet ports 20a, 20b are formed, which protrude in the direction of the double cartridge 2 from a rear wall of the coupling element 13. As can be seen from FIG. 1, the size of the inlet connection pieces 20a, 20b is selected such that they can be inserted into the outlet connection pieces 6a or 6b of the double cartridge 2. The inlet ports 20a, 20b form channels which extend parallel to the longitudinal axis of the mixer, ie parallel to the axis of rotation of the mixer element 12. Via openings 21 a, 21 b, the channels open radially into a region which forms the mixing chamber of the mixer housing 1 1. The opening 21 a for the larger volume component is reduced by a bulkhead 22 in its opening cross section, whereby a lead of this component can be prevented.

Furthermore, a positioning tongue 23 is formed on the coupling element 13, which likewise extends from the rear side of the coupling element 13 in the direction of the double cartridge 2. The positioning tongue 23 is convexly curved in the illustrated exhibition shape and adapted to the contour of the opening 10 in the plate 7 of the double cartridge 2. As can be seen from the figures, the positioning tab 23 protrudes toward the dual cartridge 2 beyond the inlet ports 20a, 20b. In other words, when positioning the mixer 3 on the double cartridge 2, first the positioning tongue 23 is brought into contact with the plate 7 until the positioning tongue 23 engages in the opening 10. As a result, the inlet ports 20a, 20b of the mixer 3 are aligned to match the opening into the plate 7 openings of the outlet port 6a and 6b. At the same time, the end of the mixer element 12 projecting from the coupling element 13 can engage in the central opening of the plate 7. To facilitate finding the opening 10, the positioning tongue 23 is tapered at its free end tapered or rounded. Alternatively or in addition, the opening 10 may be larger than the positioning tongue 23 and / or tapered. For sealing the mixer element 12 in the coupling element 13, a bearing bush 24 is provided in the coupling element 13, in which the mixing element 12 is rotatably mounted. The bearing bush 24 in this case has a free end directed in the direction of the outlet opening 14 of the mixer 3, while the opposite end of the bearing bush 24 terminates in the rear wall of the coupling element 13. The free end of the bearing bush 24 can thus rest sealingly on the mixer element 12. At the outlet opening 14 of the mixer 3 zugwandten front end of the coupling element 13, two circumferential, annular projections 25a, 25b are provided concentrically with each other, so that between these a circumferential groove 25c is formed. Accordingly, in the cup-like widening inlet end of the mixer housing 1 1, an annular circumferential projection 26 is formed, which can engage in the groove 25c. In the not yet bolted to the double cartridge 2 state of the mixer 3, a slight clearance between the free end of the annular projection 26 and the groove bottom of the groove 25c may be present, so that the coupling element 13 is easily rotatable within the mixer housing 1 1. When the mixer 3 is mounted on the outlet end of the double cartridge 2 and screwed there, the rear wall of the coupling member 13 comes to rest on the plate 7 of the double cartridge 2. Thus, the coupling member 13 relative to the mixer housing 1 1 slightly in the axial direction to the Outlet opening 14 of the mixer 3 is shifted toward, so that the free end of the annular projection 26 sealingly rests against the groove bottom of the groove 25 c formed between the projections 25 a and 25 b. Even with increasing application pressure, for example. By rapid feed rate of the delivery piston 5a and 5b, the coupling element 13 is pressed in the direction of the outlet opening 14, so that the seal between the annular projection 26 and the groove bottom seals more. Preferably, the collar 8 of the double cartridge 2 and the inlet portion of the mixer 3 are designed so that the respective threads 9, 17 are slightly recessed, so that the mixer 3 can first be inserted into the collar 8, without the threads interlock. In this position, the mixer 3 can be aligned by turning relative to the double cartridge 2 until the positioning tongue 23 hits the opening 10. Only then do the threads engage each other and the inlet sockets are guided into the outlet sockets. In other words, the mixer 3 can be placed completely on the double cartridge 2 only in a single position. It is therefore not possible for cross-contamination of the mixer inlet nozzle with the cartridge outlet nozzle to be carried out in advance.

In addition, a purely tactile, intuitive positioning of the mixer by rotating the mixer in the collar is possible. A visual inspection or an exact placement of the mixer can be omitted. A further advantage of the mixer according to the invention is that no special orientation of the coupling element is required relative to the mixer housing or to the double cartridge. It can thus account for an additional cost-producing assembly step including the required quality control.

As an alternative to the positioning of the mixer 3 relative to the double cartridge 2 by means of the positioning tongue shown in the figures, the inlet nozzle of the mixer with the larger diameter (eg base component) may be made longer than the other inlet nozzle with the smaller diameter (eg catalyst component). Also in this way can be done positioning and alignment, since the larger inlet port can be plugged into any other opening within the plate 7 as the opening of the corresponding outlet nozzle. A positioning tongue can thus be omitted. Regardless of the features of the mixer and / or the cartridge described above, the invention also relates to a one-piece closure element 27 shown in FIGS. 10 and 11, which can be placed on the double cartridge 2 instead of the mixer 3. For closing the double cartridge 2, two plugs 28a, 28b are provided, which can be inserted sealingly into the outlet stubs 6a and 6b. The plugs 28 a, 28 b are connected via a web 29, which acts as a torsion spring, with a sleeve 30, which can be inserted into the collar 8 of the outlet end of the double cartridge 2. An extended edge of the sleeve 30, which is provided with a knurling 31, rests on the end face of the collar 8, when the closure member 27 is sealingly placed on the double cartridge 2.

The closure element 27 can be secured in the collar 8 by means of latching hooks 32, which engage behind the thread segments of the internal thread 9 and thus lock the closure element 27 on the double cartridge. For releasing the closure element 27, the sleeve 30 can be slightly rotated with the knurling 31, wherein the web 29 twists because the plugs 28a, 28b initially stuck in the outlet port 6a and 6b. This twisting of the web 29 acting as a torsion element makes it possible for the latching hooks 32 to be disengaged from the thread segments of the internal thread 9 so that the closure element 27 can be removed from the double cartridge 2.

A preferred embodiment of the dispenser design is shown in FIG. In this case, ribs 33 are formed between or under the outlet stubs 6a, 6b on the plate 7, which protrude with respect to the plate 7. On the one hand, this prevents incorrect fitting of a mixer, so that the positioning tongue 23 is easier to find in the opening 10 and, on the other hand, can prevent material from being carried over. Thus, when changing the mixer, material leakage from the inlet and / or outlet nozzles can seldom be completely avoided. However, contact between the two material components stored separately in the cartridge must be avoided before mixing in the mixer as intended, otherwise the material components would react with one another. The transverse ribs 33 catch such material components in the region between the ribs and thus prevent a rapid carryover to the respective other outlet channel.

The mixer illustrated in FIGS. 13 and 14 has on the coupling element 13 annular end-face sealing surfaces 34 which are provided around the inlet channels 20a, 20b and on which the respective outlet branches 6a, 6b of the cartridge come to lie. These sealing surfaces cause an additional end-side sealing effect to the radial sealing surface on the outer circumference of the nozzle.

Notwithstanding the illustration in FIGS. 5 and 14, it may be advantageous for a better mixing homogeneity, at the upper (outlet side) end of the mixer element 12 in the direction of the mixer outlet, where in FIGS. 5 and 14 there is a pointed cone, another mixing blade or Install mixing element, which follows the contour of the tapered mixing sleeve and protrudes into the mouth of the mixer.

Reference numerals:

1 dispenser 18 wings

2 double cartridge 19 fret

3 mixers 20a, b inlet nozzle

4a, b container 21 a, b opening

5a, b delivery piston 22 bulkhead

6a, b Outlet 23 Positioning tongue

7 plate 24 bearing bush

7a opening 25a, b projection

8 collar 25c groove

9 female thread 26 projection

10 opening 27 closing element

1 1 mixer housing 28a, b plug

12 mixer element 29 web

13 coupling element 30 sleeve

14 outlet opening 31 knurling

15 groove 32 locking hook

16 locking projection 33 rib

17 external thread 34 end sealing surfaces

Claims

Claims:

1 . Mixer having a coupling element (13) with inlet ports (20a, 20b), a relative to the coupling element (13) rotatable mixer housing (1 1) having an outlet opening (14) and an opposite inlet end, in which the coupling element (13) received , and a mixer element (12) accommodated in the mixer housing (11), which defines a longitudinal axis of the mixer, characterized in that the inlet end of the mixer housing (11) has an external thread (17) and in that the coupling element (13) has a Positioning tongue (23) extending parallel to the inlet stubs (20a, 20b) and protruding beyond the inlet stubs (20a, 20b) in the direction away from the outlet opening (14).

2. Mixer according to claim 1, characterized in that the coupling element (13) on its the outlet opening (14) side facing sealing means (25a, 25b, 25c).

3. Mixer according to claim 1 or 2, characterized in that the coupling element (13) on its outlet opening (14) side facing two annular projections (25a, 25b), between which a circumferential groove (25c) is formed, in which a ring-like projection (26) of the mixer housing (1 1) sealingly engages.

4. Mixer according to one of the preceding claims, characterized in that the inlet nozzles (20a, 20b) of the coupling element (13) parallel to the longitudinal axis of the mixer (3) extending channels form, which open in each case via at least one radial opening (21 a, 21 b) in a mixing chamber formed by the mixer housing (1 1).

5. Mixer according to claim 4, characterized in that the cross section of at least one opening into the mixing chamber openings (21 a) by a

Schott (22) is reduced.

6. Mixer according to one of the preceding claims, characterized in that the positioning tongue (23) tapers in the direction of the outlet opening (14) facing away.

7. Mixer according to one of the preceding claims, characterized in that the coupling element (13) has at least one radially outwardly projecting latching projection (16) which engages in a radial groove (15) in the inlet end of the mixer housing (1 1).

8. Mixer according to one of the preceding claims, characterized in that the coupling element (13) is freely rotatably and possibly by a limited amount in the axial direction parallel to the longitudinal axis of the mixer (3) slidably held in the mixer housing (1 1).

9. mixer, in particular according to one of the preceding claims, with a coupling element (13) with inlet stub (20a, 20b), a relative to the coupling element (13) rotatable mixer housing (1 1) having an outlet opening (14) and an opposite inlet end in which the coupling element (13) is accommodated, and a mixer element (12) accommodated in the mixer housing (11), which defines a longitudinal axis of the mixer, characterized in that the coupling element (13) has a bearing bush (24), in which the mixer element (12) is mounted rotatably and sealed.

10. Mixer according to claim 9, characterized in that on the mixer housing (1 1) bayonet fixing means, in particular radially projecting bayonet tabs, are provided.

1 1. Mixer according to claim 9 or 10, characterized in that the coupling element (13) has a parallel to the inlet nozzle (20a, 20b) extending positioning tongue (23) in the outlet opening (14) facing away from the inlet ports (20a, 20b) protrudes.

12. dispensing device having at least two interconnected containers (4a, 4b) having a common outlet area with outlet ports (6a, 6b) for each of the containers (4a, 4b), and a releasably connectable to the outlet area mixer (3), in particular according to one of the preceding claims, comprising a coupling element (13) with inlet stubs (20a, 20b) which are each connectable to an outlet nozzle (6a, 6b), a mixer housing (11) and a mixer element accommodated in the mixer housing (11) (12), characterized in that the outlet region of the container (4a, 4b) has an internally threaded portion (9) for connection to an externally threaded portion (17) of the mixer housing (1 1).

13. Dispensing device according to claim 12, characterized in that the outlet region of the containers (4a, 4b) or the coupling element (13) of the mixer (3) is parallel to the inlet stub (20a, 20b) or the outlet stub (6a, 6b) extending positioning tongue (23), and in that in the coupling element (13) of the mixer (3) or in the outlet region of the container (4a, 4b) an opening contour (10) for receiving the positioning tongue (23) is provided.

14. Dispensing device according to claim 13, characterized in that

in that the positioning tongue (23) protrudes in the direction away from the outlet opening (14) via the inlet stubs (20a, 20b) such that the inlet stubs (20a, 20b) and the outlet stubs (6a, 6b) do not engage with each other until the positioning tongue (23) is received at least in regions in the opening contour (10), and / or

that the positioning tongue (23) and the opening contour (10) are designed such that the positioning tongue (23) can be introduced into the opening contour (10) only in exactly one position, and / or

in that the positioning tongue (23) is guided in a funnel shape in the opening (10) in a sliding manner when the outlet nozzles (6a, 6b) are sealingly pushed into one another with the inlet nozzles (20a, 20b).

15. Dispensing device according to one of claims 12 to 14, characterized in that the outlet region of the container (4a, 4b) has a plate (7) in which the outlet ports (6a, 6b) are flush, wherein

to the plate (7) an annular collar (8) connects, in which the

Inside threaded portion (9) is formed, and / or

in the plate (7) has a central opening (7a) for receiving the mixer element (12) is provided, and / or

in the plate (7) ribs (33) are formed.

16. A dispenser having at least two interconnected containers (4a, 4b) having a common outlet area with outlet ports (6a, 6b) for each of the containers (4a, 4b) and a closure member (27) detachably connectable to the outlet area is preferably a one-piece component, characterized in that the outlet region of the container (4a, 4b) has an internally threaded portion (9) and the closure element (27) locking means (32) which are releasably attachable to the internal thread (9).

17. Dispensing device according to claim 16, characterized in that the container (4a, 4b) outlet (6a, 6b) and the Verschlusselennent (27) in this insertable plug (28a, 28b), wherein the plug (28a, 28b) via a torsion element (29) are connected to the latching means (32).