EP0193054A1 - Dispensing device for flowable matter - Google Patents

Abstract

An output device (1) for flowable media, in particular pasteuse pharmaceutical or cosmetic preparations, with a drag piston (12) guided in a storage container (2) is filled through the drag piston (12) forming a connector (41), after which in a drag pipe (11) connected to a discharge pump (8) and a container closure (3) is inserted into the trailing piston (12). As a result, the inside of the container to be filled can be easily closed from the outside during filling and clean and hygienic filling is ensured with simple assembly of the device (1), with the possibility of pushing the trailing piston (12) after filling up the riser pipe (11 ) and the discharge pump (8) to be filled with the filled medium and to close the ventilation openings (24) in the manner of a slide control.

Description

The invention relates to a dispensing device for flowable media, in particular pasteuse pharmaceutical or cosmetic preparations, with a storage container receiving a discharge pump after filling at the open end, which in the area of this end facing away from a closed bottom has a filling opening for its before filling has an empty filling space forming the storage space after filling, furthermore forms a traction piston for a trailing piston which delimits the storage space opposite the floor, in particular after filling from a filling to a working position closing the storage space, and which is penetrated by a riser pipe, on which the drag piston is guided, the outer end of the riser pipe being provided for the line connection with a discharge opening of the discharge pump.

A dispenser is known (DE-OS 30 06 680), in which the trailing piston is completely removed from the storage container in the filling position and thus the storage container is filled through its upper open end. The filling chamber of this dispenser is therefore not closed by the trailing piston, but the trailing piston is only inserted over the filled medium after filling, so that the trailing piston then closes the storage space. As a result, clean filling of the storage container is relatively difficult and the insertion of the trailing piston can also be difficult because, when inserted between the trailing piston and the top of the filled medium, an overpressure which counteracts the insertion of the trailing piston builds up.

It is also known (DE-OS 33 04 926) to fill the bottom of the storage container in such a way that it is only placed after filling the container from the associated end. Here, however, air cushions can easily be enclosed between the bottom and the associated side of the filled medium, which leads to difficulties in the discharge of the medium with the aid of the discharge pump. This training also prevents clean filling.

The invention has for its object to provide an output device of the type mentioned, which ensures a clean or hygienic filling in a simple manner.

This object is achieved in an output device of the type described at the outset according to the invention in that the filling opening is provided in the trailing piston, which in its filling position is the filling chamber delimited at the associated end and that in the filling position in the area of the trailing piston at least one closable ventilation opening is provided for the filling space. In the inventive design is therefore of the B _s despite closed container base - closed filling enclosed container space before or at the latest at the beginning of the filling on the associated end by the trailing piston to a relative to this smaller filling. The trailing piston no longer needs to be removed after filling, but it closes the storage container at the end of the filling hygienically from the start until the device is emptied. The air escaping from the container during filling can escape through the ventilation opening.

It is conceivable to insert the riser pipe or the riser pipe and the trailing piston as a combined assembly in the storage tank before or simultaneously with the start of the filling and then fill the filling space through the riser pipe from bottom to top, in this case the filling opening is in the area of the outer end of the riser pipe and after the filling the riser pipe has to be connected to the discharge pump. However, in order to be able to mount the riser pipe on the discharge pump beforehand and to be able to assemble the riser pipe in an assembly grouped with the discharge pump, it is expedient if the filling opening is directly delimited by the drag piston, whereby relatively large cross sections of the filling opening can also be achieved. This is particularly the case if the drag piston does not have a separate opening as the filling opening would have to be subsequently closed by an operation intended exclusively for this purpose, but if the filling opening is formed by the opening of the trailing piston provided for receiving the riser pipe, which has sealing elements due to its design provided for sealed guidance on the riser pipe and thus has a delimitation by at least one sealing lip Forms connector for a filling mouthpiece of a filling device. The riser pipe can be used immediately after pulling the filling nozzle out of the trailing piston.

Very high hygiene requirements can be met if the ventilation opening can be closed with the movement of the drag piston from the filling position to the starting working position, in particular by the drag piston. The ventilation opening is thus closed immediately after the filling or at least almost at the moment of the completion of the filling when the trailing piston is guided into the working position. This practically precludes the ingress of bacteria or the like into the medium and ensures high sterility of the medium, which enables the filled dispenser to be stored for a very long time over several years, for example four or more years, even if no preservatives have been added to the medium . The dispensing device according to the invention is suitable, for example, for the filling with, as well as the storage and discharge of anti-infectives, antifungal agents, anti-inflammatory agents and similar media.

For simple and quick movement of the towing piston from the filling position it is provided that the ver from the filling position to the working position on the container slidingly guided trailing piston has on its outer end face an overrun stop for a driving stop connected, in particular, to the riser pipe and / or to the discharge pump, and that the storage space is shorter than the filling space by an amount corresponding to the associated driving stroke of the trailing piston. As a result, the filling chamber can first be filled without air inclusion, that is, until the filled medium comes into contact with the associated end face of the drag piston, after which the drag piston simultaneously with the assembly of the discharge pump and possibly the riser pipe by the predetermined driving stroke by direct mechanical action on the drag piston in the storage container is pressed.

Both to further improve the hygienic conditions and also to ensure that the dispensing device, after filling and ready-to-stock closure, already discharges the full amount of medium intended for each actuation when the discharge pump is actuated, it is advantageous if the storage space and preferably also that The riser pipe and the pump chamber of the discharge pump are completely filled with the medium after filling, that is to say without any cavities or air pockets. In the embodiment according to the invention, this can be achieved in a simple manner in that the pump chamber of the discharge pump and, if appropriate, the riser pipe are filled by the displacement of the drag piston following the filling of the storage space, preferably the displacement volume corresponding to the driving stroke of the drag piston at least approximately is as large as the volume of the pump chamber and possibly the riser pipe. Especially if during this ver slide of the trailing piston which is optionally closed in the rest position by a valve outlet channel of the discharge pump is opened, for example, by holding the discharge pump in an actuating position lying at the end of the pump stroke, the medium displaced from the container can easily be inserted into the riser pipe and finally into the Discharge pump or its pump chamber rise. If the riser pipe is also used during this process, it is immersed in the stored medium and also displaces a corresponding volume from the container into the riser pipe or the discharge pump.

So that the riser pipe can be easily inserted into the sealing elements of the trailing piston, it is expedient if the free end of the riser pipe, in particular conically, is tapered to a width that is smaller than that of the filling opening. In this, but also in other embodiments of the subject matter of the invention, assembly is very simple if the driver stop forms a component with the container closure carrying the discharge pump and / or is formed in one piece with the riser pipe, the driver stop particularly in the open end of the container engaging driving cap for the system adjacent to the sealing members of the drag piston. This prevents the driving stop from touching any sealing element of the drag piston and possibly leading to damage. The trailing piston can, for example, have a front end wall facing the container bottom, beyond the rear side of which the sealing members protrude, the overrun stop advantageously being formed by the rear side of this end wall.

The design according to the invention also makes it possible to securely close the vent opening after filling without any special effort. This is achieved according to the invention in that the vent opening can be closed in a slide-controlled manner with respect to the storage space, the trailing piston preferably forming the slide which releases the vent opening in the filling position and closes in the working position. A structurally very simple design is obtained if the ventilation opening is connected to the outside of the output device via a ventilation channel, which is preferably provided in a groove-like manner on the inner lateral surface of the open end portion of the container and / or whose inner end forms the ventilation opening.

In a further embodiment of the invention, the slide is formed by an annular sealing lip of the trailing piston, preferably its annular sealing lip which seals the storage space on the piston raceway and which, in particular, projects obliquely from the trailing piston against the trailing direction and / or is provided at the front piston end in the trailing direction. This ring sealing lip can be made relatively short in cross section and with high rigidity, so that it ensures a precisely defined closing of the vent opening and no separate seal or the like has to be provided for this.

To further simplify the handling of the dispenser during assembly and filling, the trailing piston lies in the filling position in the region of a slightly enlarged container section in the internal cross section compared to the piston running surface, in particular up to the open end surface of the container, which preferably has an oblique annular shoulder in the pistons merges with the raceway and / or in the filling position forms a system annular shoulder, in particular channeled through by the ventilation opening, for the front annular sealing lip of the drag piston in the towing direction. As a result, the trailing piston can be used relatively smoothly up to the filling position and the filling position is precisely determined by the annular shoulder acting in the manner of a stop. Since the towing piston engages in the annular shoulder with an elastic member, namely the associated ring sealing lip, it results in the towing piston being fixed in the filling position in the manner of a spring catch, which can be overcome by a correspondingly high force acting on the towing piston, and then simultaneously Vent opening is closed.

According to a further feature of the invention, the guiding and sealing of the trailing piston with smooth running is substantially improved in that the, in particular ring-shaped, trailing piston for guiding on the piston raceway and / or on the riser pipe has at least two annular sealing lips, one behind the other, of which the rear, the ring sealing lip associated with the riser pipe can form the connection piece for the filling mouthpiece and can be provided on the inside with a further ring sealing lip for contact with the filling mouthpiece. Appropriately, the annular sealing lips protrude obliquely towards the sealing surface in cross section, i.e. that the ring sealing lips associated with the piston raceway are flared to the rear and the ring sealing lips associated with the riser pipe are tapered conically or frustoconically to the rear.

Both when filled through the riser pipe and then the discharge pump is connected to the riser pipe, as well as when the riser pipe is filled and the riser pipe is installed together with the discharge pump it to achieve a secure connection between the riser pipe and discharge pump advantageous if the outer end of the riser pipe for the connection of the discharge pump forms a connecting member of a particularly telescopic line connector, which is in particular formed by two plug sleeves, preferably the connecting member of the riser pipe by the Connecting member of the discharge pump overlapping end portion and / or an inner sleeve engaging in the connecting member of the discharge pump is formed.

The design according to the invention is particularly suitable for those dispensing devices in which the discharge pump is designed as a piston pump, which preferably has a check valve, such as a ball valve, between the pump piston and the riser pipe. As a result, the discharge pump can also be kept in its actuated state in a simple manner during assembly.

Some media, for example by creeping, tend to move in the finest traces between the piston and its raceway and thereby form a kind of bridge between both sides of the piston. This can be the case, for example, with fatty media, such as ointment-like preparations. For such media in particular, it is advantageous if, according to a further feature of the invention, the empty space of the container above the trailing piston is sealed from the atmosphere in the rest position of the discharge pump, so that any traces of the medium that get into this space are also sealed off from the outside . In a simple embodiment, the housing of the discharge pump is inserted into the container in a sealed manner, preferably with an annular flange provided on its housing in an interior only a container closure sealed with the container is blown in, the discharge pump additionally being provided with an air compensation that is sealed in its rest position. The air equalization for the empty space is thus carried out with the interposition of a valve which is inevitably closed when the discharge pump is at rest, so that the empty space is hermetically double-sealed from the atmosphere when the output device is at rest and thus in the storage state, namely once through the sealed connection of the pump housing with the container _. and secondly through the closed air balance. Nevertheless, a simple connection of the discharge pump with the container in the manner of a snap connection is possible. For example, the discharge pump can be hygienically installed together with the, for example, cap-shaped container closure in a module on the filled base part of the container.

The design according to the invention also makes it possible to design the dispensing device in a simple manner so that it can be practically completely emptied, including the riser pipe and the discharge pump. This can be achieved in an advantageous manner, for example, by leaving at least one ventilation channel for the riser, in particular provided on the outer circumference of the riser, from the floor level of the vessel, which, when the trailing piston is at the bottom end position, releases a ventilation connection from the empty space of the vessel to the inner end of the riser and its end facing away from the floor, preferably shortly before reaching this end position in the manner of a slide control overflowed from the associated sealing lip of the trailing piston. If the trailing piston rests on the bottom of the container and thus has reached its associated end position, the riser pipe including the pump chamber can still be sucked completely empty by further actuation of the discharge pump, because this design connects the lower end of the riser pipe to a ventilation.

The design of the dispensing device according to the invention enables both a precisely metered dispensing of media and the dispensing of relatively highly viscous media, which ensures a very versatile application of the device. This advantage is achieved in a surprisingly simple manner, in particular when the dispensing device consists of an atomizer pump known per se and a storage container with drag or climbing pistons, since the action of the climbing piston thus supports the suction behavior of the discharge pump or the flow behavior of the medium that with an atomizer pump that is not suitable for highly viscous media, but rather for low-viscosity media, a repeatably precisely metered discharge of media is possible, which have a relatively high viscosity. The discharge pump can be designed, for example, according to DE-PS 13 02 372 (= US- _PS 33 63 093), but expediently has an overrun shoulder which is effective at the end of the pump stroke for the pump piston for the forced opening of the outlet valve in accordance with EP-A-00 25 224 on; reference is made to these publications for further features and effects of the subject matter of the invention.

These and other features of preferred developments of the invention also result from the description

and the drawings, whereby the individual features each individually or in groups in the form

• Fig. 1 eine erfindungsgemäße Ausgabeeinrichtung, teilweise im Axialschnitt,
• Fig. 2 einen Schnitt nach der Linie II/II in Figur 1,
• Fig. 3 die Ausgabeeinrichtung gemäß Figur 1 in der Befüllstellung,
• Fig. 4 ein weiteres Ausführungsbeispiel einer Ausgabeeinrichtung im Axialschnitt,
• Fig. 5 einen Ausschnitt der Figur 4 in vergrößerter Darstellung,
• Fig. 6 die Ausgabeeinrichtung gemäß Figur 5 in der Befüllstellung,
• Fig. 7 die Ausgabeeinrichtung gemäß Figur 5 kurz vor Beendigung der Überführung in die Ausgangs-Arbeitsstellung gemäß Figur 5,
• Fig. 8 die Ausgabeeinrichtung gemäß Figur 5 am Ende des Gesamthubes des Schleppkolbens,
• Fig. 9 den unteren Teil des Behälters einer weiteren
• und 10 Ausführungsform im Axialschnitt und in Draufsicht.

of sub-combinations in one embodiment of the invention and in other fields. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:

• 1 shows an output device according to the invention, partly in axial section,
• 2 shows a section along the line II / II in FIG. 1,
• 3 shows the dispensing device according to FIG. 1 in the filling position,
• 4 shows a further exemplary embodiment of an output device in axial section,
• 5 shows a detail of FIG. 4 in an enlarged view,
• 6 the dispensing device according to FIG. 5 in the filling position,
• 7 shortly before the transfer to the starting working position according to FIG. 5,
• 8 at the end of the total stroke of the drag piston,
• Fig. 9 shows the lower part of the container of another
• and 10 embodiment in axial section and in plan view.

As FIGS. 1 to 3 show, an output device 1 according to the invention has, for example, a substantially cylindrical storage container 2, which is closed at one end with a bottom 4 formed in one piece with it and at the other end 5 with a cap-like or sleeve-like container closure 3 , which rests with an annular shoulder on the associated end face of the container 2 and with one over it Ring shoulder protruding connecting sleeve 6 engages centered in the open end 5 of the container 2. In the container closure 3, an annular inner groove 7 is provided, in which a discharge pump 8 lying coaxially with the container closure 3 and the container 2 with an annular flange 9 formed by its housing is blown in from below and thereby secured and fastened both radially and axially. The container 2 limits with the container closure 3 and the discharge pump 8 or the ring flange 9 the total container hermetically sealed to the outside when the discharge pump 8 is at rest. The end of the discharge pump 8 facing the bottom 4 is part of a plug-in connection 10, via which a discharge pipe 11 is connected to the discharge pump 8, which is located coaxially with the latter and which extends close to the bottom 4. A drag piston 12 is guided on the riser pipe 11 and can be displaced in a sealed manner both with respect to the inner jacket surface of the container 2 and with respect to the outer peripheral surface of the riser pipe 11. At the outer end, the discharge pump 8 has, on a pump plunger 13 projecting beyond the outer end of its housing, an actuating head _f 14 which is guided in the container closure 3 and is provided with a radially projecting discharge spout which delimits the discharge opening 15 of the dispensing device.

The container 2, with its section of its inner surface adjoining the flat inner surface of the bottom 4 and extending over most of its length, forms a raceway 16 for the drag piston 12. This ends at its end facing away from the bottom 4 via a 45 ° Chamfer formed oblique annular shoulder 17 in a slightly enlarged inside section container section 18, which essentially up to open end face 19 of the container 2 is sufficient. Adjacent to this end face 19, the inner surface of the container section 18 is narrowed only by two annular beads 20, 21 which are partially circular in cross section, the inner width of the container being the same, larger or at most slightly smaller in the area of the raceway 16 in the area of these ring beads. The connecting sleeve 6 of the container closure 3 has, on the outer circumference, complementary annular grooves for the engagement of the annular beads 20, 21, which are arranged such that when the ring shoulder of the container closure 3 adjoining the connecting sleeve 6 rests in a clip-like manner and engages positively and sealingly on the end face 19 engage in the annular beads 20, 21. Provided in the inner surface of the container section 18 are a plurality of axially groove-shaped ventilation channels 23, which are evenly distributed around the central axis 22 of the container 2, each of which passes from the end face 19 to the annular shoulder 17 and in which there is a recessed and therefore both the annular shoulder 17 and the one Form raceway 16 at the associated end penetrating ventilation opening 24. The ventilation channels 23 are sealed with the container closure 3 attached to the outside.

The essentially ring-shaped trailing piston 12, which has an approximately U-shaped cross-section in axial section on each side of its central axis 22 with profile legs directed away from the base 4, is formed at its end facing the base 4 by a substantially flat, annular disk-shaped end wall 25; From their end face facing away from the bottom 4, four ring sealing lips 25 to 29 protrude. Two ring sealing lips are essentially for sealed sliding on the raceway 16 and two ring sealing lips 28, 29 for sealed sliding on cylindrical outer circumference of the riser 11 is provided. The two annular sealing lips 26, 28 that protrude less than or away from the bottom 4 of the end wall 25 or lie substantially approximately in the area of the thickness of the end wall 25 have only a very small lip length in cross-section and are inclined at approximately 45 ° to the central axis 22 inclined such that they bear relatively hard resiliently on the associated treads. The installation of these two ring sealing lips takes place almost in the same plane perpendicular to the central axis 22. The two other ring sealing lips 27, 29, which are also tapered at an acute angle to their free ends, are inclined at substantially smaller angles to the associated running surfaces, such that the ring sealing lip 27 associated with the raceway 16 widens conically to its free end surface and the other ring sealing lip 29. is tapered at an acute angle. The free end faces of these two annular sealing lips and thus their contact zones on the associated running surfaces lie axially behind those of the annular sealing lips 26, 28 and in a common plane perpendicular to the central axis 22. The distance between the inner annular bead 21 and the annular shoulder 17 is greater than that Distance between the contact surface of the annular sealing lip 26 associated with the annular shoulder 17 and the rear end face of the annular sealing lip 27; 3, the rear end face of the trailing piston 12 is at a short distance from the inner annular bead 21. The flank of the annular sealing lip 26 facing the bottom 4 is formed by a frustoconical centering surface 30 on the circumference of the drag piston 12, which is formed by the bottom 4 facing end face of the end wall 25 to the free end face of the sealing lip 26 enough in the manner of a chamfer and expediently has the same flank angle as the ring shoulder 17. In the relaxed state, the outer diameter of the annular sealing lip 26 is almost the same as the inner diameter of the container section 18, so that the trailing piston 12, although centered in the arrangement according to FIG. 3, engages radially essentially stress-free in the container 2 and presses against the annular shoulder 17 under axial pressure this can lie essentially sealingly with the annular sealing lip 26.

The rear end face of the end wall 25 of the trailing piston 12 facing away from the floor 4 forms with it. annular zone between the two annular sealing lips 27, 29 an overrun stop 31 for a driving stop 32. The driving stop 32 is combined to form an assembly with the discharge pump 8 and / or the container closure 3 and, in the exemplary embodiment shown, is formed in one piece with the riser pipe 11; it is formed by the end of the jacket of a driving cap 33 of the riser pipe 11 facing the bottom 4 or the inner end of the riser pipe 11. Its end wall lies in the plane of the outer end of the riser tube 11, for example, formed by a plastic injection molded part, and merges into this end in one piece. The inner length of the jacket of the driving cap 33 is the same size or at least slightly larger than the distance between the overrun stop 31 and the free end of the annular sealing lip 29, so that a pressure or compression load on the annular sealing lip 29 occurs when the driving stop 32 is in contact with the overrun stop 31 the end wall of the driving cap 33 is not to be feared.

The plug connection 10 between the discharge pump 8 and the riser pipe 11 also extends approximately over the length of the driving cap 33. The end of the housing of the discharge pump 8 facing the bottom 4 is reduced in diameter by a sleeve-shaped one, compared to the rest of the discharge pump 8, and to its free end slightly tapered connecting link 34 is formed, which delimits the inlet channel of the discharge pump 8. The complementary, also sleeve-shaped connecting member 35 of the riser pipe 11 is formed by its end section 36, which tightly encloses the connecting member 34 on the outer circumference, and by an inner sleeve 37 lying coaxially therewith, which engages in a sealed manner into the interior of the connecting member 34, so that by pressing the connecting members 34, 35 a frictional, but extremely firm connection takes place.

To limit the filling space 38 in the container 2, the trailing piston 12 is inserted so far into the container 2 that its outer annular sealing lip 26, which is in the direction of the arrow 39, bears on the annular shoulder 17 with the flank associated with the centering surface 30, such that the radially outer Ring sealing lips 26, 27 with their actual sealing edges rest exclusively on the inner lateral surface 40 of the container section 18 and have not yet been transferred to the raceway 16. Since the riser pipe 11 or the discharge pump 8 has not yet been inserted into the drag piston 12, the radially inner annular sealing lips 29, 28 of the drag piston 12 can be used as a connecting piece 41 for a filling mouth piece 42 indicated by dash-dotted lines in FIG. 3, ie the annular sealing lips 29, 28 delimit a filling opening 43.

The filling nozzle 42 expediently engages only so far in the annular sealing lips 29, 28 that its front end does not protrude beyond the front piston end 44 facing the bottom 4. In this state, the filling space 38 is connected to the vent opening 24. When the medium to be filled into the container 2 is pressed in through the filling mouthpiece 42, the air can thus escape from the filling space 38 through the ventilation channels 23 until the filling space 38 is completely filled from the bottom 4 to the trailing piston 12 without air being trapped. It is conceivable to design the filling mouthpiece 42 so long that its end lies near the bottom 4 at the beginning of the filling and is drawn outwards with increasing filling while the drag piston 12 is at a standstill.

After filling, the filling mouthpiece 42 is pulled out of the trailing piston 12 or the connecting piece 41. Here, the towing piston 12 is not moved relative to the container 2, which is relatively simple since the towing piston 12 is now secured in its position relative to the container 2 by the filling. After the filling mouthpiece 42 has been pulled out, the preassembled assembly consisting of the riser pipe 11, the discharge pump 8 and the container closure 3 is inserted into the open end of the container 2, the inner, conically tapered end 45 of the riser pipe 11 first being inserted into the annular sealing lip 29 , 28 is inserted until the driving stop 32 abuts the overrun stop 31 of the drag piston 12; here the container closure 3 has not yet reached its final assembly position relative to the container 2. When the container closure 3 or the riser pipe 11 is pushed in further, the driving stop 32 takes place the trailing piston 12 by a predetermined driving stroke 46 in such a way that the annular sealing lip 26 jumps over the annular shoulder 17, reaches the raceway 16 and at the same time closes the ventilation openings 24 with respect to the interior of the container. At the end of this driving stroke, the container closure 3 is in its final assembly position relative to the container 2 and the trailing piston 12 according to FIG. 1 in its starting working position, ie the storage space 47 is now defined in the container 2. Part of the medium filled into the container 2 is displaced both by the penetration of the riser pipe 11 into the container 2 and by the driving stroke 46 of the trailing piston 12 during the described assembly of the dispensing device, which is then caused by rising in the riser pipe 11 and penetration into the pump chamber 58 of the discharge pump 8 can avoid. So that the pump chamber 58 is vented during this first filling of the discharge pump 8, the discharge pump is held in an actuation at the end of its pumping stroke during assembly. In the exemplary embodiment shown, the discharge pump 8 is designed as a piston pump which, between the pump piston 56 and the riser pipe 11, has a check valve 48 which opens to the discharge opening 15 and which is located directly adjacent to the connecting member 34 in the housing 49 of the discharge pump 8. The housing 49 of the discharge pump 8 forms a cylinder with a piston race 55 for a pump piston 56, which together with the pump plunger 13 represents a piston unit. The pump piston 56, which is guided on the piston race 55 with a conically enlarged piston lip, delimits a pump chamber 58 with the cylinder and the suction valve formed, for example, by the check valve 48. The outlet channel of the pump chamber 58, not shown in detail, is an inner channel in the Piston unit provided and leads with the interposition of an outlet valve through the pump plunger 13 to the discharge opening 15. The valve body of the outlet valve is expediently formed in one piece with the pump piston 56 and has, for example, an annular bead located at a distance behind its piston lip on the inner circumference, which in the closed position of the outlet valve on one annular valve seat of the pump tappet 13 abuts. Behind or above this valve body, the pump piston 56 is formed in one piece with a piston neck 59, which surrounds the pump plunger 13 in a sealed manner and can itself be compressed in a resilient manner under axial pressure load. Opposite the pump piston 56, the piston raceway 55 ends in an inner annular shoulder 57, against which the associated end of the pump piston 56 runs at the end of the pump stroke; Beyond this position, the pump plunger 13 can be moved a little further relative to the cylinder, so that the pump piston 56, which is fixed relative to the cylinder by the annular shoulder 57, moves upward relative to the pump plunger 13 under axial compression of the piston neck 59, and the valve body of the pump piston 56 is lifted off the valve seat. As a result, from this moment the outlet valve is opened, which is closed again after the pump plunger 13 moves back around the valve at the beginning of the return stroke by the resilient force of the piston neck 59.

The outer or upper end of the housing 49 of the discharge pump 8 is closed with a cylinder cover 60, which forms the annular flange 9 projecting beyond its outer circumference adjacent to its lower end face and a through opening for the piston unit or the pump tappet 13 located in the pump axis having. The annular gap between this through opening and the piston unit forms part of a connection provided as air compensation 61 between the atmosphere and the interior of the housing 49 separated from the pump chamber 58 by the pump piston 56, the interior above the pump chamber 58 between the cylinder cover 60 and the piston lip of the pump piston 56 lies. This space is connected by an opening 62 in the housing 49 to the empty space 51 of the entire container which lies above the drag piston 12 and surrounds the discharge pump 8. 'Above the piston lip, namely in the area of the axial section in which the valve body of the exhaust valve is provided and thus in the transition area between the pump piston 56 and the piston neck 59, an air compensation valve 63 which is positively closed when the discharge pump 8 is at rest is provided in the air compensation 61, which is only open during the pumping stroke and the return stroke of the pump piston 56. This air balancing valve 63 has a valve body 64 which is formed in one piece with the pump piston 56 or the piston neck 59 and tapered upwards in the shape of a truncated cone, to which the valve seat 65 is assigned the lower end of an inner sleeve of the cylinder cover 60 which delimits the passage opening and which is in the housing 49 intervenes. In the rest position, the valve body 64 hermetically seals against the valve seat 65 under the force of a return spring, not shown, which acts on the piston unit and is arranged, for example, in the pump axis in the housing 49 or in the pump chamber 58, as a result of which the rest position of the piston unit is also ensured Stop is set. Instead of this air compensation, which is always closed when the discharge pump 8 is at rest, an air compensation opening for the empty space 51 could also be used be provided directly in the wall of the entire container, for example in the container 2 or in the container closure 3, which would be constantly open, but a sterile closure of the empty space 51 would then not be possible. The discharge pump 8 described represents a type of atomizer pump which, in particular as a result of the described outlet valve, operates with a relatively high pump pressure.

As FIGS. 1 to 3 also show, four ventilation channels 50 are provided on the outer circumference of the inner end section of the riser pipe 11 in the form of axial grooves of equal length, which extend as far as the associated free end of the riser pipe 11. When the trailing piston 12 has reached the bottom 4 of the container 2 with its front piston end 44 after the filling has been expelled from the storage space 47, the rear end of the annular sealing lip 29 releases the associated ends. 52 of the ventilation channels 50, ie that now behind the trailing piston 12 lying empty space 51 of the container 2 is connected to the inner end 53 of the riser pipe 11 via a ventilation connection. Therefore, the medium still located in the riser pipe 11 or in the pump chamber of the discharge pump 8 can be discharged through the discharge opening 15 by further actuation of the discharge pump 8 until the riser pipe 11 and the discharge pump 8 are also substantially completely emptied. At the bottom 4 of the container 2 there is a spacer 54 for the inner end face of the riser 11, such that it cannot accidentally hit the bottom 4 so that it is closed by it. The spacer 54 which is smaller than the clear cross section of the riser pipe 11 in the axial view according to FIG. 2 is in the illustrated embodiment formed by a web lying diametrically to the riser pipe 11.

In FIGS. 4 to 8, the same reference numerals as in FIGS. 1 to 3, but with the index "a", are used for corresponding parts.

In the embodiment according to FIGS. 4 to 8, the driving stop 32a is formed directly by the container closure 3a, namely by the end of its connecting sleeve 6a. The arrangement can be such that the driving stop 32a does not engage outside the sealing members of the drag piston 12a, but on the rear end face of the drag piston 12a, which is formed by the radially outer rear annular sealing lip 27a, in such a way that its rear end face touches the run-up stop 31a forms and the riser 11a at the rear end requires no special training. This embodiment is particularly expedient if the annular sealing lip 27a is of relatively large dimensions and there is therefore no need to fear damage from the driving system. However, it is also conceivable to provide an abutment shoulder for the driving stop 32a on the inner circumference of the ring sealing lip 27a, so that direct contact with the sealing surface of the ring sealing lip 27a by the driving stop 32a is not necessary.

In the embodiment according to FIGS. 4 to 8, the filling of the filling space 38a can also be carried out directly by the drag piston 12a. As FIG. 6 shows, the filling can also take place through the riser pipe 11a, ie, in addition to the drag piston 12a, the riser pipe 11a is also inserted into the container 2a before the filling. In this case, the outer end of the Riser 11a, the filling opening 43a or the connecting piece 41a for the filling mouthpiece 42a indicated by dash-dotted lines. With this type of filling, it can be safely achieved in a simple manner that the medium emerging from the lower end 53a of the riser tube 11a into the filling space 38a rises from the bottom 4a up to the trailing piston 12a without the risk of air pockets. After filling and pulling out the filling mouthpiece 42a, the assembly consisting of the container closure 3a and the discharge pump 8a is assembled in the manner described, the connecting member 34a of the discharge pump 8a being telescopically connected to the connecting member 35a of the riser pipe 11a and the drag piston 12a via the driving stroke 46a in it Working position according to Figure 5 is taken. As a result, the dispensing device is ready for operation, that is to say that a precisely metered amount of medium is discharged with the first pump stroke without empty strokes.

FIG. 8 shows the lower end position of the drag piston 12a, in which the rear ends 52a of the ventilation channels 50a are released by the associated ring sealing lip 29a of the drag piston 12a in the manner of a slide control. The air permeability desired for ventilation in this position between the outer circumference of the riser pipe and the drag piston can also be achieved by a suitable surface texture at the lower end of the riser pipe, so that separate groove-shaped ventilation channels are not required. For example, in the area of the free end of the riser pipe, this surface can be designed so rough or with grooves that between it and the associated ring sealing lip of the drag piston, a large number of labyrinthine or capillary-like air passages are created on the last section of the piston path.

In FIGS. 9 and 10, the same reference numerals are used for corresponding parts as in the previous figures, but with the index "b". In this embodiment, the ventilation channels 23b do not go as far as the open end surface 19b of the container 2b, but they are designed as pocket-shaped depressions in the inner surface of the container 2b which extend in a groove-like manner and extend from the piston raceway 16b into the inner lateral surface 40b of the container section 18b. The ventilation channels 23b end on the side facing away from the open end face 19b of the annular beads 20b, 21b forming sealing elements in cooperation with the container closure, which are not continuously closed over their circumference, but are provided with depressions or interruptions, each of which, for example, extends the associated ventilation duct 22b parallel to the central axis 22b. When the container closure is fitted, it engages in the annular groove delimited by the two annular beads 20b, 21b with an annular part that is continuously closed over the circumference and is provided on the outer circumference of the connecting sleeve of the container closure between the grooves, which is used for the engagement of the annular beads 20b, 21b are determined. As a result, the ventilation channels 24b are not sealed to the outside in the region of the open end face 19b by the container closure, as in the embodiment according to FIGS. 1 to 3, but are closed when the container closure is in place by a seal lying in the region of lateral surfaces, which is both radial as well as axial sealing pressure can and thereby enables a particularly hermetic seal. As a result, the maximum storage period of the filled device can be significantly extended without the risk of the contents spoiling. It is also conceivable to provide the connecting sleeve of the container closure on the outer circumference with projections which engage in a direct sealing manner in the ventilation channels. In any case, the airtight seal between the container closure and the container should be designed so that it can withstand an upper pressure of at least 0.5 bar. As further shown in FIG. 9, the transition between the piston race 16b and the inner surface of the bottom 4b to the centering surface 3D of the trailing piston is frustoconical in such a way that the trailing piston lies in its lower end position essentially without gaps with its centering surface on this transition surface and between the Trailing piston and the container practically no cavity remains.

Claims (18)

1. dispensing device for flowable media, in particular pasteuse pharmaceutical or cosmetic preparations, with a storage container receiving a discharge pump at the open end after filling, which in the area of this end facing away from a closed bottom empties a filling opening for its before filling, after filling, has the filling space forming the storage space, furthermore forms a track piston for a trailing piston delimiting the storage space opposite the floor, in particular after filling from a filling to a working position closing the storage space, and which is penetrated by a riser pipe on which the trailing piston is guided sealed, the outer end of the riser pipe for the line connection with a discharge opening of the discharge pump is provided, characterized in that the filling opening (43) is at least partially provided in the drag piston (12) which, in its filling position (Fig. 3), the filling chamber (38) at the associated end delimits and that in the filling position (Fig.3) in the area of the trailing piston (12) a closable vent opening (24) is provided for the filling chamber (38). 2. Device according to claim 1, characterized in that the filling opening (43) is limited over its circumference by the drag piston (12), preferably through the opening of the drag piston provided for receiving the riser pipe (11) and / or through at least one sealing lip ( 29,28) limited connector (41) for a filling mouthpiece (42) is formed. 3. Device according to claim 1 or 2, characterized in that the ventilation opening (24) with the movement of the towing piston (12) from the filling position (Fig.3) in the starting working position (Fig.1), in particular from the towing piston (12th ) is lockable. 4. Device according to one of claims 1 to 3, characterized in that the from the filling position (Fig.3) in the working position (Fig.1) on the container (2) slidably guided trailing piston (12) on its outer end face an overrun stop ( 31) for a driving stop (32), in particular connected to the riser pipe (11) and / or to the discharge pump (8), and that the storage space (47) is shorter than the filling space (38) by a dimension corresponding to the associated driving stroke (46) of the drag piston (12). 5. Device according to one of claims 1 to 4, characterized in that the storage space (47) and preferably also the riser pipe (11) and the pump chamber (58) of the discharge pump (8) are completely filled by the medium after filling. 6. Device according to one of claims 1 to 5, characterized in that the filling of the pump chamber (58) of the discharge pump (8) and possibly of the riser pipe (11) by a displacement carried out following the filling of the storage space (47) of the drag piston (12), the displacement volume corresponding to the driving stroke (46). of the drag piston (12) preferably being at least approximately as large as the intake volume of the pump chamber (58) and possibly of the riser pipe (11). 7. Device according to one of claims 1 to 6, characterized in that the. Free end (45) of the riser pipe (11), in particular conical, is tapered to a smaller width than the filling opening (43) and that preferably the driving stop (32 ) forms a component with the container closure (3) carrying the discharge pump (8) and / or is formed in one piece with the riser pipe (11), the driving stop (32) in particular engaging in the open end (5) of the container (2) Carrying cap (33) for the system adjacent to the sealing members (26,27, 28,29) of the drag piston (12). 8. Device according to one of claims 1 to 7, characterized in that the vent opening (24) can be closed in a slide-controlled manner relative to the storage space (47), preferably the trailing piston (12) in the filling position (FIG. 3) the vent opening (24 releasing and in the working position (Fig. 1) closing slide forms. 9. Device according to one of claims 1 to 8, characterized in that the vent opening (24b) with the outside of the device over. - A ventilation channel (23b) is connected, which is provided pocket-shaped in particular in the inner circumferential surface (40b) of the open end portion (18b) of the container (2b), the inner end of which forms the ventilation opening (24) and which preferably has a seal on the outlet side Container and container closure is connected upstream. 10. Device according to claim 8 or 9, characterized in that the slide is formed by an annular sealing lip (26) of the trailing piston (12), preferably the sealing space (47) on the piston raceway (16) sealing ring sealing lip (26), which in particular protrudes obliquely from the towing piston (12) against the towing direction (arrow 39) and / or is provided at the front piston end (44) in the towing direction (arrow 39). 11. Device according to one of claims 1 to 10, characterized in that the trailing piston (12) in the filling position (Figure 3) in the region of a slightly enlarged in internal cross-section relative to the piston raceway (16), in particular up to the open end surface (19) of Container (2) reaching container Section (18), which preferably merges into the piston raceway (16) via an oblique annular shoulder (17) and / or in the filling position (FIG. 3) a contact annular shoulder (17), in particular channeled through by the ventilation opening (24). for the front sealing lip (26) of the towing piston (12) in the towing direction (arrow 39). 12. Device according to one of claims 1 to 11, characterized in that the, in particular ring-shaped, drag piston (12) for guidance on the piston raceway (16) and / or on the riser pipe (11) each have at least two successive annular sealing lips (26, 27 ; 28,29), which preferably protrude in cross section opposite to the towing direction (arrow 39) obliquely towards the sealing surface and / or of which at least the rear annular sealing lip (29) associated with the riser pipe (11) has the connecting piece (41) for the filling mouthpiece (42) forms. 13. Device according to one of claims 1 to 12, characterized in that the outer end of the riser pipe (11) for the connection of the discharge pump (8) forms a connecting member (35) of a particularly telescopic line connector (10), in particular by Two plug sleeves are formed, the connecting member (35) of the riser pipe (11) preferably being formed by the end portion of which extends beyond the connecting member (34) of the discharge pump (8) and / or an inner sleeve (3) engaging in the connecting member (34) of the discharge pump (8). 37) is formed. 14. Device according to one of claims 1 to 13, characterized in that the discharge pump (8) is designed as a piston pump, which preferably has a check valve (48), such as a ball valve, between the pump piston and the riser pipe (11). 15. Device according to one of claims 1 to 14, characterized in that the empty space (51) of the container above the drag piston (12) is sealed against the atmosphere in the rest position of the discharge pump (8). 16. Device according to one of claims 1 to 15, characterized in that the housing (49) of the discharge pump (8) inserted sealed into the container, preferably with an annular flange (9) provided on its housing (49) in an inner groove (7th ) of a container closure (3) connected to the container (2) in a sealed manner and that the discharge pump (8) is provided with an air compensation (61) which is sealed in its rest position. 17. Device according to one of claims 1 to 16, characterized in that approximately from the floor level of the container (2) at least one, in particular on the outer circumference of the riser pipe (11) provided ventilation channel (50) for the riser pipe (11), which starts at the bottom End position of the trailing piston (12) releases a ventilation connection from the empty space (51) of the container (2) to the inner end (53) of the riser pipe (11) and its end (52) facing away from the floor (4) preferably shortly before reaching this end position according to Art a slide control from the to associated annular sealing lip (29) of the trailing piston (12) has overflowed. 18. Device according to one of claims 1 to 17, characterized in that it consists of a known atomizer pump (8) and a storage container (2) with drag or climbing pistons (12).

Images