EP3953053B1 - Dispenser for compounds in paste form - Google Patents

Description

field of technology

The invention relates to a dispenser for pasty masses, consisting of a storage space with a delimiting part that moves with the suction from the storage space and a head piece that is guided relative to the storage space, with a dispensing chamber being formed between the head piece and the storage space, with an inlet valve and an outlet valve, wherein a dispensing channel with a dispensing opening is also assigned to the dispensing chamber and wherein a spring element acting between the reservoir and the headpiece is provided for resilience of the headpiece when it moves from a starting position into an operating position, which spring element at the same time partially forms a boundary wall of the dispensing chamber and, as viewed in a cross section based on a drawing, in which the head piece is arranged vertically at the top and the storage space is arranged vertically at the bottom and a longitudinal central axis of the dispenser is depicted as a line, a lower tubular plug-in projection, which is sealingly received in an adapted plug-in receptacle adjoining the storage space, and has an upper retaining formation, which is sealingly received in a retaining receptacle of the head piece, wherein the spring element is formed in one piece with the retaining projection and the plug-in projection and, in relation to the cross-section mentioned in the initial position, is formed as a leg extending following the plug-in projection, which merges into the mounting projection via an upward curve.

State of the art

Dispensers of the type in question are used in particular for dispensing pasty masses in portions, for example also for dispensing cream, such as further e.g. care or toothpaste, with a jointly movable limiting part, e.g. in the form of a follower piston, being provided in a storage space storing the mass can be. The mass is dispensed in portions by pumping the head piece relative to the storage space. In this context, for example EP 2 747 893 B1 ( U.S. 9,096,362 B2 ) referenced. This patent specification discloses a dispenser of the type in question, in which a spring element held between the head piece and the storage space is tensioned by user-actuated lowering of the head piece to dispense the mass. When the pressure load acting on the head piece by the user is removed, the head piece is shifted back into the starting position as a result of the previously built-up restoring force of the spring element. The spring element has a U-shaped section both in the initial position and in the operating position with reference to a vertical section or with reference to a cross section based on a drawing, in which the head piece is arranged vertically at the top and the reservoir is arranged vertically at the bottom , which extends freely in between the storage space and a peripheral wall of the head piece. Such a donor is also, for example, from the U.S. 7,819,290 B2 known.

From the EP 2 164 645 B1 such a dispenser is known, in which the spring element is shaped like a bellows and a lip section is formed on the head piece side, which forms the outlet valve in cooperation with the spring element.

Summary of the Invention

Proceeding from the state of the art described above, the invention is concerned with the task of designing a dispenser of the type in question that is functionally and further improved with regard to favorable assembly.

According to a first idea of the invention, a solution to the problem is provided by a dispenser in which it is intended that the holder formation is designed as a holder projection that is larger in cross section than the leg and is generally circular in shape, with an upper projection base lying in the holder receptacle, which has a closed cross section having.

As a result of the proposed configuration of the spring element, a favorable assembly of the spring element in the plug-in socket on the pantry side and/or the head piece on the spring element in the region of the holding socket can result. Due to the larger cross section of the mounting projection compared to the leg, which essentially provides the spring properties of the spring element overall, in particular the projection base, which is also preferably solid in terms of cross section, a stable and preferably true-to-position arrangement of the mounting projection in the mounting recess can be achieved even during normal use of the dispenser. In addition, this makes it possible to achieve a reliable seal between the mounting projection and the mounting recess.

The cross-sectional dimension of the mounting projection can correspond, for example, to 1.5 to 5 times, further, for example, to 2 to 3 times the cross-sectional dimension of the leg viewed in the same vertical sectional plane.

Advantageously, the self-locating of the spring element-side mounting projection in the headpiece-side mounting receptacle and/or the spring element-side plug-in projection in the plug-in receptacle of the storage space can result in advantageous support during assembly. This may be due to the fact that due to the essentially horizontally provided leg orientation of the spring element in the initial position, which can also correspond to the assembly position, such a high basic stability of the spring element can be achieved that this facilitates assembly.

In addition, as a result of the proposed design, in particular the described cross-sectional design of the spring element, an overall plate-like design can result, with a peripheral edge provided with a vertically aligned edge in the described cross-section. This can further lead to improved usability of the dispenser, in particular to improved haptics during operation. The selected cross-sectional design of the spring element can result in a pressure point that can be felt by the user and is more or less defined, which pressure point has to be overcome in order to move the head piece from the starting position into the operating position. A dispenser with a comparatively small installation space in the area of the head piece can also be achieved by the proposed configuration. In this case, the plug-in projection can merge via a radially outward curvature, e.g., as is also preferred, an approximately 90° curvature, into the essentially horizontally running leg, which in turn extends radially outward via the upward curvature, e.g., as well preferably, approximately 90° bend, runs into the upper limb.

According to a preferred embodiment, the spring element can consist of a rubber-like, resilient plastic, for example resilient elastomer, more particularly made of a silicone material. This material offers sufficient resilience for the spring-loaded return of the head piece from the operating position to the starting position. The spring element can be manufactured as a plastic injection molded part.

Further features of the invention are explained below, also in the description of the figures, often in their preferred assignment to the subject matter of claims 1 to 4 or to features of further claims.

According to a further embodiment, the upward leg merges into the mounting projection via a hinge-like taper. The tapering can be given as a result of the formation of an area that is thinner than adjoining areas, for example the upward leg or the transition area. There can thus be a material taper which can offer a hinge-like effect between the upleg and the transition region. In the area of the hinge-like taper, the material thickness can be about 0.3 to 0.8 times, further for example about 0.5 times the thickness of the adjoining spring element areas, such as the transition area and/or the upward leg , can match.

According to a further embodiment, the mounting projection forms a projection leg that protrudes vertically downwards with respect to a transition area between the upward leg and the mounting projection extends radially outward to the upleg. The projection leg can, if necessary, together with the mounting projection, serve as a holding receptacle in the mounting receptacle of the headpiece. According to one possible configuration, the projection leg can interact with the mounting receptacle in a frictionally and/or positively locking manner in the region of a circumferential surface that is produced radially on the outside.

In this case, according to a further embodiment for receiving the retaining projection—and possibly the further projection leg—the mounting receptacle of the head piece is designed as a groove which is open vertically at the bottom. According to the cross section described at the outset, this groove can be essentially U-shaped, with a U-opening pointing vertically downwards, through which in particular the mounting projection of the spring element dips into the mounting receptacle.

Thus, the holder receptacle can also have a groove base which, like a ceiling, closes off the holder receptacle vertically at the top. In the case of a substantially U-shaped configuration of the groove or the mounting receptacle, this groove base is the U-web connecting the U-legs running substantially parallel to one another in cross-section.

Starting from the transition area, the mounting projection can extend vertically upwards. According to one possible embodiment, the hinge-like taper can be provided in a transition from the mounting projection into the projection leg. In a further embodiment, the mounting projection as such can have a greater extent, viewed in the radial direction, than in the same direction as the projection legs. The relative radial thickness of the mounting boss can correspond to about 1.5 to about 2 times the radial thickness of the projection leg.

According to a development, the mounting projection also engages in the circumferential groove which is open vertically at the bottom.

In a further possible configuration, the projection leg and the mounting projection can together form a peripheral outer wall of the spring element for interaction with a groove inner surface of the mounting receptacle.

In relation to a cross section, the groove can have two side walls of approximately the same length in the vertical direction. In this respect, an embodiment with side walls of different lengths in the vertical direction is preferred. In one possible embodiment, the radially outer side wall can have a shorter extension length vertically downwards, starting from the bottom of the groove or the U-web, than the radially inner side wall. However, an embodiment is preferred in which a radially inner side wall relative to the central axis is shorter than the radially outer side wall. The vertical extent of the longer side wall, starting from the bottom of the groove, can correspond to approximately 1.5 to approximately 2.5 times, further approximately 2 times the vertical extent of the shorter side wall.

According to a further possible embodiment, the radially outer side wall can protrude vertically below the projection leg. Correspondingly, the protruding leg can rest against the facing inside of the radially outer side wall, in particular with regard to its radially outer circumferential surface, if necessary over its entire surface.

According to one possible embodiment, the radially inner side wall can end in the transition region with regard to its vertical extent. In such a design of the radially inner side wall, the hinge-like taper is optional, as is also preferred. In particular, the radially inner side wall preferably does not represent an obstacle with regard to mobility in the area of the hinge-like narrowing.

A wall thickness, measured in the radial direction, of the plug-in projection interacting with the plug-in receptacle of the reservoir can, in one possible embodiment, correspond to approximately 1.5 times or more the greatest thickness in the area of the horizontally running leg of the spring element. Thus, the wall thickness of the plug-in projection in the radial direction can further correspond to approximately 2 times to approximately 3 times the greatest thickness measured in the vertical direction in the starting position in the area of the leg.

The plug-in projection can also have an axial length, starting at a lower edge of the horizontally running leg in the starting position, which is the same as or greater than the axial extent of the spring element, starting from the aforementioned lower edge of the horizontally running leg to the axial upper end of the mounting projection. The plug-in projection can thus have an axial length which can correspond to approximately 1.0 to 2 times, further for example approximately 1.1 to 1.5 times the axial extent of the spring element.

In addition, according to a further development, a valve section for forming the outlet valve is on the mounting projection molded in one piece. The valve section can, for example, protrude freely in the manner of a lobe over a vertically upper end of the mounting projection in order to close the dispensing chamber with the dispensing channel connecting discharge opening of the discharge chamber. With the lowering of the head piece and the associated increase in the pressure prevailing in the dispensing chamber, the valve section is pivoted out of its sealing position in the manner of a lobe in order to release the outlet opening. When the pressurization decreases at the end of the lowering movement of the head piece, the valve section falls back into the sealing position due to its elastic resilience.

In a further possible embodiment, the valve section can also be formed over a larger peripheral section of the mounting projection than corresponds to a maximum free opening dimension of an outlet opening of the dispensing channel adjacent to the mounting projection in the peripheral direction. In such a configuration, the valve section can accordingly be designed with a larger circumference than is necessary for the valve-like interaction with the dispensing channel. This offers assembly advantages in particular. Due to the excess width of the valve section, which is preferred in the circumferential direction, no exact orientation is necessary during the assembly of the dispenser part having the holding projection with the valve section. Rather, it may be sufficient in this case to arrange the dispenser part in relation to the dispensing channel in such a way that a part of the valve section can interact in a valve-like manner with the dispensing channel or the outlet opening.

For example, the valve section can extend over a third or more of the circumference of the mounting projection, further, for example, over half or more up to three quarters or two thirds or more of the circumference.

According to a preferred embodiment, the valve section can be designed to be uniform and closed in the form of a ring all the way around. This offers a free orientation of the dispenser part having the valve section in the course of assembly.

The head piece of the dispenser that accommodates the mounting projection can form a groove in particular for accommodating the valve section in the circumferential direction outside of the dispensing channel. The valve section, which is preferably uniform and closed in the form of a ring, emerges from the dispensing channel on both sides in the circumferential direction and is accommodated outside the dispensing channel in the above-described groove-like receptacle.

In another possible embodiment, the mounting projection can interact directly or indirectly with a lip section of the head piece to form the outlet valve. The lip section can be a head piece part designed so that it can be deflected, for example swiveled out, under pressure. The lip section can be designed to be elastically restorable as a result of the appropriate choice of material and/or material thickness.

In this case, the lip section, based on the cross section, can extend radially outward in a cantilevered manner, starting from a radially inner mounting area. The lip section can also be designed as a cantilevered flat part, further possibly in the form of a uniform and closed ring-shaped flat part.

According to a preferred embodiment, the lip section can be formed running essentially horizontally in the cross section. Such a horizontal orientation can be given in particular in a pre-assembly state. In cooperation with the mounting projection to form the outlet valve, the lip section can, in one possible configuration also in the valve closed position have an orientation aligned along a horizontal plane, for example including an acute angle of a few degrees, for example from 1° to 5°, further for example 2° or 3°.

In the valve open position, the relevant acute angle to a horizontal plane running transversely to the longitudinal central axis of the dispenser can be enlarged. In the valve open position, an acute angle of, for example, up to 10° or up to 20° can be set.

The lip section can interact with a support surface of the mounting projection that is exposed vertically upwards. In this regard, there may be direct interaction between the support surface of the mounting projection and a facing surface of the lip portion.

In a further preferred embodiment, an annular projection can be formed on the end face, on which the lip section rests sealingly in the valve closed position, so that a point contact of the lip section can result in a cross section.

The formation of the valve with the lip section resting on the head piece or on the annular projection of the head piece can, as is also preferred, be provided over the entire circumference of the mounting projection. Correspondingly, when a pressure load in the dispensing chamber is exceeded, the lip section can at least partially lift off the holding projection or the annular projection of the holding projection, viewed over the circumference, in order to allow the portioned mass to exit from the dispensing chamber into the dispensing channel. Also he can In this case, the lip section lifts off the holding projection or the annular projection at several points around the circumference, regularly or irregularly, but also completely over the entire circumference with a uniform or uneven vertical spacing from the sealing seat.

The lip section can be formed on a plug-in part arranged in the head piece. The plug-in part can initially be present as a loose part in the course of assembly. Furthermore, such a plug-in part, as well as preferably the other parts of the dispenser, can be produced in a plastic injection molding process.

In a further embodiment, the lip section can merge radially on the inside into a circumferential ring section that protrudes vertically downwards over the lip section in relation to the cross section. Such a ring section can be suitable for reducing the volume of the dispensing chamber in the depressed state of the head piece. In addition, such a ring section can, for example, dip into a U-section of the leg of the spring element that extends essentially vertically in the unloaded position when the head piece is in the pressed-down state and essentially fill this resulting bead-like space.

The lip section or the plug-in part having the lip section can consist of a hard plastic. For example, PE or TPE can be used in this regard, as well as possibly also with regard to the other dispenser parts, preferably with the exception of the spring element.

In a further embodiment, the horizontally running leg can be formed in one piece with the inlet valve. The inlet valve can likewise act like a lobe, but preferably in the manner of a plug with a corresponding inlet opening between the storage space and the dispensing chamber.

According to a further preferred embodiment, the spring element can be designed in one piece and of the same material together with the inlet valve and the outlet valve as well as the mounting projection, the projection leg and the plug-in projection.

The head piece can be guided in a stop-limited manner on an insert part facing the storage space. This stop limitation preferably relates to the basic position of the head piece, in which no dispenser is actuated, and/or the lowered position of the head piece, for dispensing the mass. The guidance and/or limit stop can, as is also preferred, be provided by partial areas that are optionally formed directly on the head piece and/or the insert part.

Thus, according to a preferred embodiment, a guide and a limit stop can be assigned to different components of the head piece and the insert part. Components of the head piece and the insert part can preferably serve solely to guide the head piece on the insert part, and other components of the head piece and the insert part can preferably solely serve to limit the stop. This can result in advantages, in particular with regard to the production of the dispenser, further in particular with regard to the assembly of the head piece on the insert part. Thus, through the local separation of the guide and limit stop, for example during assembly, guidance in the axial direction can already be achieved before the components for limit stop are brought into a mutually effective position.

Correspondingly, in one possible configuration, the insert part can have a first cylinder section, which interacts with a second cylinder section of the head piece for guidance. This can, as is also preferred, be circular-cylindrical cylinder sections, more preferably aligned concentrically to one another, in which case the first cylinder section of the insert part can be arranged, for example, radially inward with respect to the second cylinder section of the head piece with respect to the longitudinal center axis of the dispenser. The reverse arrangement is also possible in this respect.

The insert part can have a third cylinder section serving for latching with the space, which can also interact with a fourth cylinder section of the head piece to limit the stop. Here, too, for example, the fourth cylinder section of the head piece can be arranged radially inwards with respect to the longitudinal central axis of the dispenser and the third cylinder section of the insert part correspondingly radially outwards to the fourth cylinder section of the head piece. Here, too, the reverse arrangement is possible in this regard.

According to a preferred embodiment, the third and fourth cylinder sections of the insert part and the head piece, which are used to limit the stop, can be arranged radially on the outside opposite the first and second cylinder sections, which are used for guidance. A reverse arrangement is also possible here, so that the limit stop can be arranged radially on the inside with respect to the guide.

The head piece can be guided in a stop-limited manner on an insert part facing the storage space. This stop limit preferably affects the basic position of the headpiece

-Schritten der jeweiligen Dimension, ggf. also auch dimensionslos. Beispielsweise beinhaltet die Angabe 1,1- bis 1,5-fach auch die Offenbarung von 1,2- bis 1,5-fach, 1,1- bis 1,4-fach, 1,2- bis 1,4-fach etc. Diese Offenbarung kann einerseits zur Eingrenzung einer genannten Bereichsgrenze von unten und/oder oben, alternativ oder ergänzend aber zur Offenbarung eines oder mehrerer singulärer Werte aus einem jeweilig angegeben Bereich dienen.The ranges or value ranges or multiple ranges specified above and below also include all intermediate values with regard to the disclosure, in particular in $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$10$}\right.$

-Increments of the respective dimension, possibly also dimensionless. For example, the indication 1.1 to 1.5 times also includes the disclosure of 1.2 to 1.5 times, 1.1 to 1.4 times, 1.2 to 1.4 times etc. On the one hand, this disclosure can be used to delimit a specified range limit from below and/or above, but alternatively or additionally to disclose one or more singular values from a respective specified range.

Brief description of the drawings

Fig. 1

in einem Vertikalschnitt einen Spender der in Rede stehenden Art mit einem in dem Vorratsraum mitbeweglichen Begrenzungsteil in Form eines Nachlaufkolbens;

Fig. 2

eine der Fig. 1 entsprechende Darstellung, wobei das mitbewegliche Begrenzungsteil durch einen den Vorratsraum weiter auch ausbildenden komprimierbaren Beutel gebildet ist;

Fig. 3

die Herausvergrößerung des Bereiches III in Fig. 1 nach Entfernen einer Abdeckkappe;

Fig. 4

die Herausvergrößerung des Bereichs IV in Fig. 3;

Fig. 5

eine der Fig. 3 entsprechende Darstellung, jedoch nach Verlagerung eines Kopfstückes aus der Ausgangsstellung gemäß Fig. 3 in eine Betätigungsstellung;

Fig. 6

ein zwischen dem Vorratsraum und dem Kopfstück angeordnetes Federelement in perspektivischer Einzeldarstellung;

Fig. 7

das Federelement in weiterer perspektivischer Darstellung;

Fig. 8

eine im Wesentlichen der Fig. 3 entsprechende Schnittdarstellung, betreffend eine zweite Ausführungsform;

Fig. 9

die Ausführungsform gemäß Fig. 8, nach Verlagerung des Kopfstückes in eine Betätigungsstellung;

Fig. 10

eine weitere der Fig. 3 entsprechende Schnittdarstellung, betreffend eine dritte Ausführungsform;

Fig. 11

die Herausvergrößerung des Bereichs XI in Fig. 10;

Fig. 12

die Ausführungsform gemäß Fig. 10 in der Betätigungsstellung;

Fig. 13

eine Darstellung gemäß Figur 1, jedoch betreffend eine vierte Ausführungsform in der Ausgangsstellung;

Fig. 14

die Herausvergrößerung des Bereichs XIV in Figur 13;

Fig. 15

die Ausführungsform gemäß Figur 13 in der Betätigungsstellung;

Fig. 16

das Federelement der vierten Ausführungsform in einer perspektivischen Einzeldarstellung;

Fig. 17

das Federelement der vierten Ausführungsform in einer perspektivischen Schnittdarstellung;

Fig. 18

eine weitere der Figur 1 entsprechende Darstellung, betreffend eine fünfte Ausführungsform in der Ausgangsstellung;

Fig. 19

die Herausvergrößerung des Bereichs XIX in Figur 18;

Fig. 20

die Ausführungsform gemäß Figur 18 in der Betätigungsstellung;

Fig. 21

das Federelement der fünften Ausführungsform in perspektivischer Einzeldarstellung;

Fig. 22

das Federelement der fünften Ausführungsform in einer perspektivischen Schnittdarstellung;

Fig. 23

das Federelement in perspektivischer Darstellung, eine sechste Ausführungsform betreffend.

The invention is explained below with reference to the attached drawing, which, however, only represents exemplary embodiments. A part that is only explained in relation to one of the exemplary embodiments and is not replaced by another part in a further exemplary embodiment due to the special feature highlighted there is thus also described as a possible existing part for this further exemplary embodiment. The drawing shows:

1

in a vertical section, a dispenser of the type in question with a delimitation part in the form of a follower piston that can be moved along with it in the reservoir;

2

one of the 1 Corresponding representation, wherein the delimitation part that can be moved along is formed by a compressible bag that also forms the storage space;

3

the enlargement of area III in 1 after removing a cover cap;

4

the enlargement of area IV in 3 ;

figure 5

one of the 3 corresponding representation, but after moving a head piece from the starting position according to 3 to an actuated position;

6

a spring element arranged between the storage space and the head piece in a perspective individual representation;

7

the spring element in another perspective view;

8

one essentially the 3 corresponding sectional view, relating to a second embodiment;

9

the embodiment according to 8 , after displacement of the head piece in an operating position;

10

another of the 3 corresponding sectional view, relating to a third embodiment;

11

the enlargement of the area XI in 10 ;

12

the embodiment according to 10 in the operating position;

13

a representation according to figure 1 , but relating to a fourth embodiment in the starting position;

14

the enlargement of area XIV in figure 13 ;

15

the embodiment according to figure 13 in the operating position;

16

the spring element of the fourth embodiment in a perspective individual representation;

17

the spring element of the fourth embodiment in a perspective sectional view;

18

another of the figure 1 Corresponding representation relating to a fifth embodiment in the starting position;

19

the enlargement of the area XIX in figure 18 ;

20

the embodiment according to figure 18 in the operating position;

21

the spring element of the fifth embodiment in a perspective individual representation;

22

the spring element of the fifth embodiment in a perspective sectional view;

23

the spring element in a perspective view, relating to a sixth embodiment.

Description of the embodiments

Shown and described, first with reference to the figures 1 and 2 , a dispenser 1 in particular for dispensing a pasty mass M.

The dispenser 1 is essentially made up of a mass container 3 delimiting a storage space 2 and a head piece 4 that can be displaced relative to this mass container 3.

In a preferred embodiment, as also shown, the dispenser 1 is rotationally symmetrical with a central axis x.

The head piece 4 can preferably be displaced along the central axis x relative to the mass container 3 or the storage space 2 .

As further in the embodiment according to the Figures 1 to 7 shown, a delimitation part 5 in the form of a follower piston 6 that can be moved along with it can be provided in the storage space 2 . Alternatively, the delimiting part 5 as shown in 2 can also be formed by a compressible bag 7 that simultaneously forms the reservoir 2 .

In the unused position of the dispenser 1 as shown in the figures 1 and 2 the head piece 4 can be covered by a closure cap 8, as is also preferred. This can have an outside diameter corresponding to the outside diameter of the mass container 3 .

The mass container 3 can have a housing base 9 . The opening of the mass container 3 pointing vertically upwards in the illustrations is covered by an insert part 10 which, in the normal operating state of the dispenser 1, is inextricably connected, at least not detachably connected to the mass container 3, in particular snap-connected.

The mass M is in according to in 1 illustrated embodiment by the follower piston 6 and the insert 10 and by the peripheral wall of the mass container 3 limited storage space 2 stored. With an arrangement of a bag 7 as shown in FIG 2 the mass M is received in the storage space 2 delimited by the bag 7 on the bottom and peripheral side and above by the insert part 10 .

The insert part 10 can, starting from a conical area 11 , form a plug-in receptacle 12 extending approximately to the opening plane E of the mass container 3 . As also shown, this can initially have a central pot-like elevation concentric to the central axis x, with a peripheral pot wall 13 and a pot top 14 adjoining it along the upper edge of the pot wall 13 and aligned transversely to the center axis x. The pot top 14 can as also preferred, be penetrated centrally by an inlet opening 15.

A receiving wall 16 encompassing the pot wall 13 extends concentrically to the pot wall 13 and at a radial distance therefrom.

The insert part 10 formed in this way can be fixed in a latching manner on the mass container 3 , in particular in the area of the opening edge of the mass container 3 .

In addition, the insert part 10 can be designed for locking the closure cap 8 in place, wherein the insert part 10 can have a circumferential vertical collar 17 that protrudes beyond the opening plane E of the mass container 3 and that can interact with a circumferential lower edge area of the closure cap 8 in the closed cap position.

The vertical collar 17 can also serve to guide the head piece 4 in the vertical direction. For this purpose, the vertical collar 17 can interact with a wall outside of an annular wall section 18 of the head piece 4 that is vertically aligned with respect to the illustrations.

As a result of the guidance described above, the head piece 4 can be displaced in the vertical direction along the center axis x relative to the reservoir 2, with appropriate guidance, the vertical displacement being both vertically downwards and vertically upwards in each case limited by a stop.

A dispensing chamber 19 is provided between the storage space 2 and the head piece 4 for dispensing mass M in portions. This extends in particular in the starting position according to the Figures 1 to 4 essentially above the plug-in receptacle 12 of the insert part 10.

The dispensing chamber 19 is delimited circumferentially to the central axis x at least over a vertical sub-section by a radially inner side wall 20 of the head piece 4, as well as on the top side by a top section 21 which, like the side wall 20, is made in one piece and of the same material as the head piece 4.

A further peripheral boundary adjoining the side wall 20 substantially vertically below, as well as a vertically lower boundary of the dispensing chamber 19, is provided by a spring element 22.

The head piece 4 also has a dispensing channel 23 with a dispensing opening 24 . The dispensing channel 23 can be connected to the dispensing chamber 19 via an outlet opening 25 formed in the side wall 20 . In the course of With a pumping movement, in which the head piece 4 is moved along the central axis x while reducing the volume of the dispensing chamber 19 in the direction of the storage space 2, the portioned mass M stored in the dispensing chamber 19 is dispensed through the outlet opening 25 and the dispensing channel 23.

The spring element 22 described above can, as is also preferred, be an injection-molded part made of a thermoplastic elastomer, optionally consisting of silicone, while the other components of the dispenser 1 are preferably made of polypropylene and/or polyethylene. As a result of this design, the dispenser 1 is preferably completely recyclable.

The spring element 22 is initially with respect to an unloaded position, which is more preferably the starting position according to the Figures 1 to 4 may correspond, shaped like a plate, with a plate base which, in the starting position, forms a leg 26 running essentially horizontally in vertical section, as shown. In the area of its radially outer end, this horizontally aligned leg 26 preferably transitions from the same material and in one piece into a curve 27 directed vertically upwards with respect to the drawings, which further transitions into an at least approximately vertically aligned upward leg 28 . The upward limb 28 forms the further boundary wall 29 for the dispensing chamber 19 corresponding to the central axis x.

The upward limb 28 merges into a mounting projection 30 in the vertically upper region facing away from the curvature 27. This can be a ring-like rim around the axis x, in vertical section according to the illustrations essentially rectangular or square-shaped act designed portion, which is accommodated in a head piece-side holder seat 31.

As also shown, the mounting receptacle 31 can be in the form of a circumferential groove 32 open vertically downwards, with a groove cover 33 formed by the U-web and two U-legs forming the respective U-legs, preferably running parallel to one another in a vertical section Side walls, of which a radially inner side wall of the groove 32 may be given by the side wall 20 described above. A radially outer side wall 34 runs at a radial distance from the side wall 20, also circumferential to the central axis x.

As is also preferred, the mounting projection 30 can be held in the groove 32 or the mounting receptacle 31 in a positive and/or frictional manner. The projection base 35, which is rectangular in cross-section as described above, can rest radially on the inside on the inner side wall 20 and radially on the outside on the side wall 34, if necessary also with an end face pointing vertically upwards on the groove cover 33.

Furthermore, a protruding leg 36 protruding vertically downwards can be formed onto the protruding base 35 from the same material and in one piece, which can also be supported on the facing surface of the radially outer side wall 34 .

The radially outer side wall 34 can extend vertically downwards to such an extent that it protrudes beyond the projection leg 36 . In addition, the vertical extension length a of the radially outer side wall 34 starting from the groove cover 33 can correspond to approximately 1.5 to 2.5 times, further approximately 2 times the vertical length b of the radially inner side wall 20 .

The portion of the spring element 22 that is essentially plate-like in the initial position is connected to the mounting projection 30 via a hinge-like taper 37 formed between the upward leg 28 and the mounting projection 30 . This hinge-like taper 37 is given by a thinning of the material compared to the areas adjoining on both sides. The material thickness in the area of the taper 37 can essentially be about 0.3 to 0.7 times, more for example 0.5 times the thickness d in the area of the upward leg 28 and/or the curvature 27 and/or of the leg 26 correspond.

With regard to the arrangement on the mounting projection 30, the taper 37 can be positioned such that, starting from this taper 37, the projection base 35 extends vertically upwards and the projection limb 36 extends vertically downwards, with the projection limb 36 extending radially outwards and at a radial distance to the upleg 28 can run.

In addition, the radially inner side wall 20 of the head piece 4 can be dimensioned with regard to its vertical length b such that it ends in the area of the taper 37 or above this taper 37 .

An annular plug-in projection 38 extends vertically downwards from the leg 26, which essentially forms the plate bottom of the spring element 22 and runs horizontally in vertical section. This grips into the groove-like plug-in receptacle 12, correspondingly between the pot wall 13 and the receptacle wall 16.

Here, the plug-in projection 38 with respect to a vertical section, for example 3 have a wall thickness c, measured in the radial direction, which is 1.5 to 2.5 times, moreover about 2 times, the greatest thickness d in the region of the horizontal leg 26 and/or curvature 27 and/or the upward leg 28.

In addition, the plug-in projection 38 can have an axial length e, beginning at a lower edge 39 of the leg 26, which runs horizontally in the starting position, which length e, according to the exemplary embodiment shown, is approximately the length f of the spring element 22 between the lower edge 39 and the axially upper end of the Bracket projection 30 may correspond.

Both the retaining projection 30 and the plug-in projection 38 can, as is also preferred, be formed in one piece and of the same material with the plate-like spring element section. In addition, a valve section 40 for forming an outlet valve 41 and a valve plug 42 for forming an inlet valve 43 can also be provided in one piece and of the same material.

The valve section 40 can be formed in the region of an axially upper end of the holding projection 30 on the latter in the manner of a lobe. This valve section 40 passes through an opening 44 provided into the dispensing channel 23 and, in the valve closed position, lies sealingly in front of the outlet opening 25 (cf. in particular 3 ).

The valve plug 42 is connected via webs 45 to the region of the leg 26 running horizontally in the initial position and closes in the initial position according to FIG 3 valve-like the inlet opening 15.

The head piece 4 and the spring element 22 can be assembled in such a way that, according to a possible embodiment, the spring element first 22 is plugged onto the insert part 10, as a result of the plug-in projection 38 being inserted into the plug-in socket 12 and then the head piece 4 being put on, with the mounting projection 30 being inserted into the mounting socket 31 and the valve section 40 being inserted through the opening 44 into the dispensing channel 23. Alternatively, however the spring element 22 are also initially held on the head piece 4, with the corresponding insertion of the holding projection 30 into the holding socket 31, after which the head piece 4 provided with the spring element 22 is placed on the mass container 3, with the insertion of the plug-in projection 38 in the plug-in socket 12 of the insert part 10

In both cases, there is an advantageous support for self-discovery in the course of assembly. In its unloaded initial position, the spring element 22 has a rigidity that is favorable for assembly.

In addition, in the starting position according to 3 the spring element 22 are in a relief position or in a position that almost corresponds to a relief position. This results in long-lasting good spring properties of the spring element 22, as well as a favorable feel when the head piece 4 is lowered for the user in the course of a dispenser actuation.

A lowering movement of the head piece 4 along the central axis x in the direction of the mass container 3 results in a mass output (cf. figure 5 ). In the course of this lowering, an increase in pressure is achieved with a reduction in the volume of the dispensing chamber 19 . This results in the valve section 40 forming the outlet valve 41 being lifted in order to release the outlet opening 25 . The mass M stored in the discharge chamber 19 is (at least partially) discharged via the discharge channel 23 .

In the course of this lowering movement and as a result of the associated pressure load, the valve plug 42 forming the inlet valve 43 is pushed into the region of the inlet opening 15 in a sealing manner.

In the course of this lowering movement of the head piece 4, a spring restoring force is built up in the spring element 22. As can be seen in figure 5 , as a result of the leg 26, which runs essentially horizontally in the initial position, being pivoted downwards about a temporary bending axis resulting in the area where the leg 26 is supported on the free end face of the receiving wall 16, so that with the leg 26, the curvature 27 and the upward leg 28 in the lowered head piece position and thus in the tensioned position of the spring element 22 in vertical section a substantially approximately U-shaped area is set, which is particularly in the operating position according to figure 5 extends essentially below the support plane of the receiving wall 16 for the leg 26 .

According to this operating position figure 5 When the pressure load on the head piece 4 ceases, there is an automatic return, in particular as a result of the return of the leg 26 in the direction of its horizontal basic alignment. The associated application of negative pressure in the dispensing chamber 19 leads on the one hand to supporting the sealing of the valve section 40 against the outlet opening 25 and to a lifting of the valve plug 42 from the inlet opening 15 (see dash-dotted representation in 3 ), so that with a rearward displacement of the head piece 4 in the direction of the starting position, mass M is sucked through the inlet opening 15 into the dispensing chamber 19.

Extends the flap-like valve portion 40 in the in the Figures 1 to 7 illustrated first embodiment exclusively within the output channel 23 and viewed accordingly in the circumferential direction with a circumferential length that is preferably smaller than the inner diameter of the output channel 23, the result is according to in the figures 8 and 9 The second exemplary embodiment illustrated also has a valve section 40 which lips out essentially vertically upwards and which is formed on the upper side of the mounting projection 30 uniformly and in a closed ring-shaped manner with respect to the longitudinal center axis x.

For complete accommodation and for the preferred orientation-free equipping of the head piece 4 with the spring element 22 designed in this way, the head piece 3 is provided with a groove 46 for accommodating the valve section 40 around the circumference outside of the dispensing channel 23 . The valve section 40 can project completely into this groove 46 with a view to a described cross section. The groove 46 can also be designed in such a way that it can also be provided with a radial dimension that can prevent the valve section 40 from shifting outside of the dispensing channel 23 in the course of a mass dispensing.

In addition, the groove 46 can, as is also preferred, be designed in the manner of a vertical extension of the mounting receptacle 31 with a possibly reduced cross section.

According to the embodiment described above, the channel wall surrounding the delivery channel 23 is provided with a slot-like opening in the circumferential direction on both sides of the outlet channel 23, which is preferably completely sealed by the valve section 40 penetrating these openings.

In the course of a downward movement of the head piece 4 to dispense the mass and the associated increase in pressure within the dispensing chamber 19, there is preferably only a flap-like pivoting displacement of the valve section 40, as described above, in the region within the dispensing channel 23 that covers the outlet opening 25 like a valve (cf. 9 ).

Next, according to the figures 8 and 9 illustrated embodiment, the projection legs 36 of the mounting projection 30 protrude vertically downwards beyond the radially outer side wall 34 and thereby underpin the radially outer side wall 34, whereby a further favorable mounting of the spring element 22 on the head piece 4 can be achieved. In addition, the head piece 4 can be supported axially via the radially outer side wall 34 on the base section 47 adjoining the projection leg 36 .

In addition, as also provided in the third exemplary embodiment described below, the insert part 20 can have integrally formed ribs 48 pointing in the direction of the head piece 4 and circumferentially to the receiving wall 16, in particular for stabilizing the insert part 10. As further from the illustrations As can be seen, these ribs 48 can be provided evenly distributed over the circumference.

The head piece 4 can also have such ribs 49 which can be formed on the underside of an actuating surface 50 of the cover section 21 pointing into the interior of the dispensing chamber 19 . As is also preferred, these ribs 49 can also be formed in one piece and from the same material as the head piece 4, more preferably with a plurality of such ribs 49 distributed uniformly around the longitudinal center axis x.

In addition, the circumferential valve portion 40 of the embodiment in FIGS figures 8 and 9 in the usual position of use, in particular in the valve closed position according to 8 , from an essentially vertical orientation in the unaffected pre-assembly state by a few angular degrees, for example by 1° to 3° radially outwards, elastically formed in the groove 46 or in the sealing seat within the dispensing channel 23. A corresponding prestressing of the valve section 40 in the direction of the sealing position results.

The Figures 10 to 12 12 show a further embodiment in which the mounting projection 30 of the spring element 22 is held on the head piece 4 in particular by a radially outer contact with the side wall 34 of the storage space 2 . The mounting receptacle 31 is essentially provided by the side wall 34 . The mounting projection 30 is in the position of use according to Figures 10 to 12 positively and frictionally in the holder receptacle 31 under contact with the facing surface of the side wall 34, with a lower base section 47 of a projection leg 36 also provided here being able to underpin the side wall 34.

The mounting projection 30 can have a supporting surface 51 that is exposed vertically upwards. According to the illustrations, this can essentially be aligned in a plane transverse to the longitudinal center axis x.

A projection 52 with a bead-like cross-section and an overall ring shape concentric to the longitudinal central axis can be formed on the support surface 51, in particular as a result of a one-piece design with the same material as the mounting projection 30, in particular with the spring element 22.

The annular projection preferably serves to interact with a lip section 53 of the head piece 4 to form the outlet valve 41.

The lip section 53 is essentially designed as a flat part which extends essentially horizontally, in particular in an unloaded pre-assembly position. In this case, as is also preferred, the lip section 53 can be formed in one piece and of the same material on a plug-in part 54 arranged on the head piece 4 . The plug-in part 54 can interact with the radially inner side wall 20 radially on the inside.

The lip section 53 can extend further at a vertical distance from the vertically lower end of the side wall 20 , starting from a radially inner mounting area 56 on a peripheral plug-in part wall 55 interacting with the radially inner side wall 20 , cantilevered radially outward. In the area of a radially outer free end area, the surface of the lip section 53 pointing vertically downwards acts in a sealing manner with the projection 52 . Here, in accordance with a valve-closed position 10 in a cross section, the lip section 53 encloses an acute angle of a few degrees, for example of 2° or 3°, to a horizontal plane under pretension.

The plug-in part wall 55 can form a ring section 57 protruding vertically downwards over the area of the peripheral lip section 53 . This ring portion 57 is adapted to be in the depressed dispenser operating position according to 12 immerse yourself in the resulting essentially U-shaped spring leg area, essentially filling it.

During this actuation of the dispenser and the associated increase in pressure in the dispensing chamber 19, the lip section 53 is lifted from its sealing seat (projection 52 of the mounting projection 30), as a result of the lip section 53 pivoting about the mounting area 56. In this outlet valve open position, the mass M on the lip section 53 passed into an annular space 58 resulting between the side walls 20 and 34 and via this into the output channel 23 .

The plug-in part 54 can essentially form the cover of the dispensing chamber 19 .

According to the above-described embodiments, the head piece 4 can be guided in the direction of the longitudinal center axis x on the insert part 10 and thus on the mass container 3 having the reservoir 2 by guiding the ribs 48 on the insert part side against the facing inner surface of a fourth cylinder section 62 of the head piece 4 , which fourth cylinder section 62 can be formed directly by the annular wall section 18.

The vertical collar 17 can be part of a third outer cylinder section 61 of the insert part 10 and at the end facing the head piece 4 can form a stop projection 63 which points radially inwards and is optionally annular. This stop projection 63 preferably serves to limit the stop of the head piece 4 in the starting position, for which purpose the stop projection 63 interacts with a counter stop 64 of the head piece 4 . As is also preferred, this counter-stop 64 can be formed on the previously described fourth cylinder section 62 of the head piece 4 .

Correspondingly, in the above-described embodiments, guidance and stop limitation result from the same component of the head piece 4, here the fourth cylinder section 62.

At the in the Figures 13 to 22 In the illustrated fourth and fifth embodiments of the dispenser 1, different components are used for the stop limitation and the guidance both with regard to the head piece 4 and with regard to the insert part 10. In these embodiments, no ribs 48 are preferably provided on the insert part side.

Instead, the insert part 10 has, in addition to the radially outer third cylinder section 61 , a further radially inner first cylinder section 59 which is preferably aligned concentrically with the third cylinder section 61 . The first cylinder section 59 of the insert part 10 preferably originates in a transition area between the conical area 11 of the insert part 10 and a base of the insert part 10 that runs essentially transversely to the longitudinal center axis x. This first cylinder section 59 can extend from the base of the insert part 10 in the axial direction to extend approximately into the opening plane of the insert part 10 defined by the free edge of the third cylinder section 61 .

The limit stop is also given in these embodiments as a result of the interaction of the third cylinder section 61 of the insert part 10 and the fourth cylinder section 62 of the head piece 4, in particular as a result of the stop-limiting interaction of the stop projection 63 on the insert part side and the counter stop 64 on the head piece side, with the counter stop 64 optionally being provided by individual ones over the circumference on the outside of the wall of the fourth cylinder section 62 arranged and running substantially in the axial direction ribs can be formed.

Guidance, on the other hand, is provided by the interaction of the first cylinder section 49 on the insert part side with a second cylinder section 60 of the head piece 4, which is provided separately here, whereby, according to the illustrations, the first cylinder section 59 on the insert part side can be arranged radially on the outside with respect to the second cylinder section 60 of the head piece 4. Overall, the guide cylinder sections are provided radially on the inside with respect to the stop cylinder sections, whereby, according to a preferred embodiment, the second cylinder section 60 on the head piece side can be formed by the annular wall section 18 of the holder receptacle 31 that is longer in the axial direction than in the exemplary embodiments described above.

The valve plug 42 of the fourth and fifth embodiment, as for example based on the figure 12 described, be designed shell-like. According to the illustrations in the Figures 18 to 22 For example, such a shell-like valve plug 42 can have a pin 65, optionally a web or cross web, in the middle, receiving the longitudinal center axis x, which can preferably be formed in one piece and from the same material as the valve plug 42. This pin 65 can extend from a base of the shell of the valve plug 42 into a shell opening plane of the valve plug 42 . As a result of this configuration, increased rigidity can be achieved in this area of the valve plug 42 .

In addition, the fourth and fifth embodiments also differ from embodiments 1 to 4 with regard to the design and orientation of the leg 26 of the spring element 22. In the fourth and fifth embodiment, there is preferably no essentially horizontally running leg that has a curvature in passes an upleg. Rather, the leg 26 extends in the unloaded Starting position preferably rising conically with continuous curvature, starting immediately in the transition to the plug-in projection 38 and ending at the end in the mounting projection 30. The leg 26 can be with respect to a vertical section, for example according to figure 13 or figure 17 run along a straight line or, as is also preferred, along a continuously curved line. So further according to the enlarged views in the figures 14 and 19 a straight line connecting the openings of the leg 26 into the plug-in projection 38 on the one hand and into the holding projection 30 on the other hand encloses an acute angle α of approximately 15° to 30° to a plane viewed transversely to the longitudinal center axis x, which is preferably aligned parallel to the opening plane E .

Due to the conical design of the section of the spring element 22 formed in cross section by the leg 26, a favorable assembly of the same can be achieved.

The substantially conically rising design of the leg 26 can provide greater stability of the spring element 22 in the unactuated position, in particular with regard to an unintentional pressing down of the head piece 4. In a further embodiment, the conically rising leg 26 can also be combined with a substantially horizontal aligned, emanating from the plug-in projection 38 portion according to the first embodiments.

Next, according to the embodiment in the Figures 18 to 22 in the transition region from the plug-in projection 38 into the leg 26, on the underside of the leg 26 and thus radially outwardly with respect to the plug-in projection 38, a bead 66 can be formed in one piece and from the same material. As also shown, this bead 66 can point in the direction of the insert part 10 have a flat bottom surface aligned transversely to the longitudinal center axis x, which can also be at an axial distance from the facing end face of the receiving wall 16 according to the illustrations. This axial distance can correspond to approximately 0.5 to 2 times, moreover approximately 1 times, the material thickness of such a receiving wall 16 .

Increased rigidity can be achieved in this transition region from the plug-in projection 38 into the leg 26 by the bead 66, as a result of which the bending of the leg 26 when the head piece 4 is actuated according to FIG figure 20 preferably only occurs from an area that adjoins the bead 66 radially on the outside. The kick area is specifically placed in the thin-walled area formed by the leg 26 .

As further exemplified in the representations of Figures 13 to 22 As can be seen, the projection base 35 of the mounting projection 30 can be spaced axially with respect to its end face pointing upwards in the direction of the cover section 21 from the facing groove base 67 of the groove 32 in the mounting receptacle 31. This axial distance can be approximately 0.5 to 2 -fold, moreover correspond to approximately 1-times the above-described axial distance between the bead 66 and the receiving wall 16, further, for example, approximately the material thickness of the second cylinder section 60 delimiting the groove 32 radially on the outside.

According to one possible embodiment, this axial distance can be provided by ribs formed individually over the circumference and formed on the bottom of the groove 67, against which the projection base 35 comes in the course of assembly. In this way, a clear contact of the projection base 35 in the mounting receptacle 31 can be achieved. any irregularities, For example, due to air pockets between the contact surfaces, can be compensated in this way.

The outlet opening 25, which is closed in the unloaded starting position, can also be formed by a U-opening with an open edge downwards in the direction of the leg 26 (compare in particular figure 18 and 20 ), which can result in a further improved flow of mass when the dispenser is actuated.

The recess 68 , which is aligned essentially in the direction of the longitudinal center axis x and merges into the dispensing channel 23 , for receiving the tab-like valve section 40 can, according to the in FIGS Figures 18 to 22 illustrated fifth embodiment, starting from the mounting receptacle 31 over the area of the discharge channel 23 also be formed with the formation of a free overhang 69.

The recess 68 formed behind the valve section 40 in the pivoting direction of the valve section 40 when the head piece 4 is actuated can be enlarged in comparison to the exemplary embodiments described above such that an escape space 70 results for the valve section 40 . This can provide the valve section 40 with sufficient pivoting mobility, with simultaneous pivoting limitation.

How further in particular from the perspective views in the Figures 21 and 22 As can be seen, in a further embodiment the valve section 40 has a concave shape 71 radially on the outside, corresponding to the dispensing channel 23, which results in favorable pivoting and spring characteristics of the valve section 40 with further increased stability of the same.

Alternatively, according to the embodiment in figure 23 the valve section 40, viewed in the circumferential direction, have a middle, relatively thin-walled tab section 73, which is flanked on both sides in the circumferential direction by rib sections 72, which are thick-walled in the radial direction—relative to the longitudinal center axis x. The thickness of the rib section 72 can be approximately 3 to 5 times further correspond to about 4 times the thickness of the tab portion 73 viewed in the same direction.

In addition, as also shown, in the circumferential direction between the rib sections 72 and the tab section 73, a transition section 74 that is reduced in thickness compared to the adjacent rib section 72 can be formed, with a thickness that is approximately half the thickness of the rib section 72 and further approximately twice the thickness of the tab section 73 can match.

Also as a result of this formation of the tabs, a favorable pivoting mobility can be achieved with sufficiently high stability, in particular in the valve closed position. When the dispenser is actuated, a valve section 40 formed in this way can, if necessary, swing open in a valve-opening manner solely in the area of the middle tab section 73 . The edge-side rib sections 72 can optionally find an abutment in the above-described overhang 69 . As an alternative or in combination with this, the thick-walled rib sections 72 together with the middle, thin-walled tab section 73 - possibly also together with the transition sections 74 - can also swing open into the valve open position when the dispenser is actuated, but optionally over a smaller distance than the middle tab section 73 and/or the transition sections 74 Pivoting angle - e.g. as a result of a pivoting limitation of the rib sections 72 engaging in the overhang 69 allowing a limited pivoting movement. <b><u>List of Reference Signs</u></b> 1 dispenser 29 boundary wall 2 pantry 30 bracket protrusion 3 mass container 31 bracket mount 4 headpiece 32 groove 5 boundary part 33 groove cover 6 trailing piston 34 Side wall 7 bag 35 projection socket 8th sealing cap 36 protrusion leg 9 caseback 37 rejuvenation 10 insert part 38 plug-in projection 11 cone area 39 bottom edge 12 plug-in receptacle 40 valve section 13 pot wall 41 outlet valve 14 pot cover 42 valve plug 15 intake port 43 intake valve 16 receiving wall 44 opening 17 vertical collar 45 web 18 ring wall section 46 groove 19 output chamber 47 base section 20 Side wall 48 rib 21 ceiling section 49 rib 22 spring element 50 operating surface 23 output channel 51 support surface 24 dispensing opening 52 head Start 25 exhaust port 53 lip section 26 leg 54 male part 27 curvature 55 male part wall 28 upleg 56 bracket area 57 ring section 58 annulus E opening level 59 first cylinder section M Dimensions 60 second cylinder section u transition area 61 third cylinder section 62 fourth cylinder section 63 stop projection 64 counterattack 65 cones 66 bead 67 groove bottom 68 recess 69 Got over 70 escape room 71 molding 72 rib section 73 flap section 74 transition section a length b length c Wall thickness i.e thickness e length f length x longitudinal central axis

Claims (15)

1. Dispenser (1) for pasty masses (M), consisting of a storage chamber (2) with a limiting part (5) which can be moved along during suction from the storage chamber (2) and a head piece (4) guided relative to the storage chamber (2), wherein a dispensing chamber (19) is formed between the head piece (4) and the storage chamber (2), with an inlet valve (43) and an outlet valve (41), wherein furthermore a dispensing channel (23) with a dispensing opening (24) is associated with the dispensing chamber (19) and wherein a spring element (22) acting between the storage space (2) and the head piece (4) is provided for springing back the head piece (4) during a movement from a starting position into an actuating position, which at the same time partially forms a boundary wall (29) of the dispensing chamber (19) and, viewed in a cross-section with respect to a drawing representation in which the head piece (4) is arranged vertically above and the storage space (2) vertically below and a longitudinal center axis (x) of the dispenser (1) is depicted as a line, a lower tubular plug-in projection (38) which is received sealingly in a plug-in receptacle (12) which adjoins the storage space (2) and is formed in an adapted manner, the plug-in receptacle (12) adjoining the storage space (2), and an upper retaining projection which is sealingly received in a retaining receptacle (31) of the head piece (4), wherein the spring element (22) is formed integrally with the retaining projection (30) and the plug-in projection (38) and, in relation to said cross-section, is formed in the initial position as a leg (26) which extends adjacent to the plug-in projection (38) and merges into the retaining projection (30) via an upwardly directed curvature (27), characterised in that the retaining projection is formed as a generally annular retaining projection (30) of larger cross-section than the leg (26), with an upper projection base (35) which lies in the retaining receptacle (31), which has a closed cross-section, in that a valve section (40) for forming the outlet valve (41) is integrally formed on the retaining projection (30), and in that the valve section (40) has a concave formation (71) radially on the outside, facing the outlet channel (23).
2. Dispenser (1) for pasty masses (M), consisting of a storage chamber (2) with a limiting part (5) which can be moved along during suction from the storage chamber (2) and a head piece (4) guided relative to the storage chamber (2), wherein a dispensing chamber (19) is formed between the head piece (4) and the storage chamber (2), with an inlet valve (43) and an outlet valve (41), wherein furthermore a dispensing channel (23) with a dispensing opening (24) is associated with the dispensing chamber (19) and wherein a spring element (22) acting between the storage space (2) and the head piece (4) is provided for springing back the head piece (4) during a movement from a starting position into an actuating position, which at the same time partially forms a boundary wall (29) of the dispensing chamber (19) and, viewed in a cross-section with respect to a drawing representation in which the head piece (4) is arranged vertically above and the storage space (2) vertically below and a longitudinal center axis (x) of the dispenser (1) is depicted as a line, a lower tubular plug-in projection (38) which is received sealingly in a plug-in receptacle (12) which adjoins the storage space (2) and is formed in an adapted manner, the plug-in receptacle (12) adjoining the storage space (2), and an upper retaining projection which is sealingly received in a retaining receptacle (31) of the head piece (4), wherein the spring element (22) is formed integrally with the retaining projection (30) and the plug-in projection (38) and, in relation to said cross-section, is formed in the initial position as a leg (26) which extends adjacent to the plug-in projection (38) and merges into the retaining projection (30) via an upwardly directed curvature (27), characterised in that the retaining projection is formed as a generally annular retaining projection (30) of larger cross-section than the leg (26), with an upper projection base (35) which lies in the retaining receptacle (31), which has a closed cross-section, in that the retaining receptacle (31) of the head piece (4) is designed as a groove (32) which is open in the vertically downward direction in order to receive the retaining projection (30), in that the retaining projection (30) fits into the circumferential groove (32) which is open in the vertically downward direction, vertically downwardly open groove (32) of the head piece (4), and in that the projection base (35) of the retaining projection (30) is axially spaced apart from a facing groove base (67) of the groove (32) with respect to its end face pointing upwards in the direction of a ceiling section (21).
3. Dispenser (1) for pasty masses (M), consisting of a storage chamber (2) with a limiting part (5) which can be moved along during suction from the storage chamber (2) and a head piece (4) guided relative to the storage chamber (2), wherein a dispensing chamber (19) is formed between the head piece (4) and the storage chamber (2), with an inlet valve (43) and an outlet valve (41), wherein furthermore a dispensing channel (23) with a dispensing opening (24) is associated with the dispensing chamber (19) and wherein a spring element (22) acting between the storage space (2) and the head piece (4) is provided for springing back the head piece (4) during a movement from a starting position into an actuating position, which at the same time partially forms a boundary wall (29) of the dispensing chamber (19) and, viewed in a cross-section with respect to a drawing representation in which the head piece (4) is arranged vertically above and the storage space (2) vertically below and a longitudinal center axis (x) of the dispenser (1) is depicted as a line, a lower tubular plug-in projection (38) which is received sealingly in a plug-in receptacle (12) which adjoins the storage space (2) and is formed in an adapted manner, the plug-in receptacle (12) adjoining the storage space (2), and an upper retaining projection which is sealingly received in a retaining receptacle (31) of the head piece (4), wherein the spring element (22) is formed integrally with the retaining projection (30) and the plug-in projection (38) and, in relation to said cross-section, is formed in the initial position as a leg (26) which extends adjacent to the plug-in projection (38) and merges into the retaining projection (30) via an upwardly directed curvature (27), characterised in that the retaining projection is formed as a generally annular retaining projection (30) of larger cross-section than the leg (26), with an upper projection base (35) which lies in the retaining receptacle (31), which has a closed cross-section, and in that the leg (26) passes into the retaining projection (30) via a hinge-like taper (37).
4. Dispenser (1) for pasty masses (M), consisting of a storage chamber (2) with a limiting part (5) which can be moved along during suction from the storage chamber (2) and a head piece (4) guided relative to the storage chamber (2), wherein a dispensing chamber (19) is formed between the head piece (4) and the storage chamber (2), with an inlet valve (43) and an outlet valve (41), wherein furthermore a dispensing channel (23) with a dispensing opening (24) is associated with the dispensing chamber (19) and wherein a spring element (22) acting between the storage space (2) and the head piece (4) is provided for springing back the head piece (4) during a movement from a starting position into an actuating position, which at the same time partially forms a boundary wall (29) of the dispensing chamber (19) and, viewed in a cross-section with respect to a drawing representation in which the head piece (4) is arranged vertically above and the storage space (2) vertically below and a longitudinal center axis (x) of the dispenser (1) is depicted as a line, a lower tubular plug-in projection (38) which is received sealingly in a plug-in receptacle (12) which adjoins the storage space (2) and is formed in an adapted manner, the plug-in receptacle (12) adjoining the storage space (2), and an upper retaining projection which is sealingly received in a retaining receptacle (31) of the head piece (4), wherein the spring element (22) is formed integrally with the retaining projection (30) and the plug-in projection (38) and, in relation to said cross-section, is formed in the initial position as a leg (26) which extends adjacent to the plug-in projection (38) and merges into the retaining projection (30) via an upwardly directed curvature (27), characterised in that the retaining projection is formed as a generally annular retaining projection (30) of larger cross-section than the leg (26), with an upper projection base (35) which lies in the retaining receptacle (31), which has a closed cross-section, and in that the retaining projection (30) forms concerning a transition region (U) between the upward leg (28) and the retaining projection (30) a projection leg (36) which extends starting from the transition region (U) with respect to the longitudinal center axis (x) of the dispenser (1) radially outwards to the upward leg (28).
5. Dispenser (1) according to claim 4, characterised in that the retaining projection (30) extends vertically upwards starting from the transition region (U) and/or the radially outer side wall (34) projects beyond the projection limb (36) vertically downwards and/or the radially inner side wall (20) ends with respect to its vertical extension in the transition region (U).
6. Dispenser (1) according to one of claims 4 or 5, characterised in that the groove (32) has side walls (20, 34) of different lengths in relation to a cross-section (2) in the vertical direction, wherein, preferably, a radially inner side wall (20) is shorter than the radially outer side wall (34) in relation to the longitudinal center axis (x).
7. Dispenser (1) according to one of the preceding claims, characterized in that a wall thickness (c) of the plug-in projection (38) measured in the radial direction corresponds to 1.5 times or more the greatest thickness (d) in the region of a horizontally extending leg (26), the plug-in projection (38) preferably having an axial length (e), starting at a lower edge (39) of the horizontally extending leg (26) in the initial position, which is equal to or greater than the axial extension (f) of the spring element (22), starting from said lower edge (39) of the horizontally extending leg (26) to the axially upper end of the retaining projection (30).
8. Dispenser (1) according to claim 1, characterized in that the valve portion (40) is formed over a larger circumferential portion of the retaining projection (30) than corresponds to a circumferentially largest free opening dimension of an outlet opening of the dispensing channel (23) adjacent to the retaining projection (30), wherein, preferably, the valve portion (40) extends over one third or more of the circumference of the retaining projection (30).
9. Dispenser (1) according to one of the claims 1 or 8, characterised in that the valve section (40) is formed uniformly and closed annularly and/or, preferably, a groove (46) is formed in the head piece (4) for receiving the valve section (40) in the circumferential direction outside the dispensing channel (23).
10. A dispenser (1) according to any one of claims 2 to 4, characterised in that the retaining projection (30) cooperates with a lip portion (53) of the head piece (4) to form the outlet valve (41), wherein, preferably, the lip portion (53) extends in a cantilevered manner radially outwardly with respect to the cross-section starting from a radially inner retaining region (56) and/or the lip portion (53) is formed to extend substantially horizontally in the cross-section.
11. Dispenser (1) according to claim 10, characterised in that the lip portion (53) cooperates with a vertically upwardly exposed support surface (51) of the retaining projection (30), wherein, preferably, an annular projection (52) is formed on the support surface (51), on which projection the lip portion (53) rests in a sealing manner.
12. Dispenser (1) according to one of the claims 10 or 11, characterised in that the lip portion (53) is formed on a plug-in part (54) arranged in the head piece (4), wherein, preferably, the lip portion (53) merges radially inwards into a circumferential ring section (57) projecting vertically downwards beyond the lip portion (53) in relation to the cross section.
13. Dispenser (1) according to any one of claims 10 to 12, characterised in that the lip portion (53) and/or the plug-in part (54) are made of a hard plastic and/or a horizontally extending leg (26) is further integrally formed with the inlet valve (43).
14. Dispenser (1) according to one of the preceding claims, characterised in that the head piece (4) is guided in a stop-limited manner on an insert part (10) facing the storage space (2), wherein, preferably, a guide and a stop limitation are associated with different components of the head piece (4) and of the insert part (10).
15. Dispenser (1) according to claim 14, characterised in that the insert (10) has a first cylinder section (59) which cooperates with a second cylinder section (60) of the head piece (4) for guidance, and/or, preferably, the insert (10) has a third cylinder section (61) which also serves for locking with the storage space (2) and which cooperates with a fourth cylinder section (62) of the head piece (10) for stop limitation.

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